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  Subjects -> PHYSICS (Total: 804 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (20 journals)
    - NUCLEAR PHYSICS (49 journals)
    - OPTICS (89 journals)
    - PHYSICS (584 journals)
    - SOUND (22 journals)
    - THERMODYNAMICS (31 journals)

PHYSICS (584 journals)                  1 2 3 | Last

Showing 1 - 200 of 741 Journals sorted alphabetically
Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 5)
Acta Mechanica     Hybrid Journal   (Followers: 16)
Acta Scientifica Naturalis     Open Access  
Advanced Composite Materials     Hybrid Journal   (Followers: 56)
Advanced Functional Materials     Hybrid Journal   (Followers: 41)
Advanced Materials     Hybrid Journal   (Followers: 207)
Advanced Science Focus     Free   (Followers: 2)
Advanced Structural and Chemical Imaging     Open Access   (Followers: 1)
Advances in Condensed Matter Physics     Open Access   (Followers: 6)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 2)
Advances in Geophysics     Full-text available via subscription   (Followers: 5)
Advances in High Energy Physics     Open Access   (Followers: 14)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 15)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 3)
Advances In Physics     Hybrid Journal   (Followers: 7)
Advances in Physics Theories and Applications     Open Access   (Followers: 7)
Advances in Remote Sensing     Open Access   (Followers: 22)
AIP Advances     Open Access   (Followers: 9)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 3)
American Journal of Condensed Matter Physics     Open Access   (Followers: 3)
American Journal of Signal Processing     Open Access   (Followers: 8)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 1)
Annalen der Physik     Hybrid Journal   (Followers: 3)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 10)
Annales Henri PoincarĂ©     Hybrid Journal   (Followers: 3)
Annales UMCS, Physica     Open Access  
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5)
Annals of Physics     Hybrid Journal   (Followers: 4)
Annals of West University of Timisoara - Physics     Open Access  
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 2)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Annual Review of Condensed Matter Physics     Full-text available via subscription   (Followers: 1)
Annual Review of Materials Research     Full-text available via subscription   (Followers: 5)
APL Materials     Open Access   (Followers: 7)
Applied Composite Materials     Hybrid Journal   (Followers: 40)
Applied Physics A     Hybrid Journal   (Followers: 6)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 30)
Applied Physics Research     Open Access   (Followers: 4)
Applied Physics Reviews     Hybrid Journal   (Followers: 10)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 6)
Applied Remote Sensing Journal     Open Access   (Followers: 21)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 5)
Archive for Rational Mechanics and Analysis     Hybrid Journal  
Asia Pacific Physics Newsletter     Hybrid Journal  
ASTRA Proceedings     Open Access  
Astronomy & Geophysics     Hybrid Journal   (Followers: 6)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 4)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 4)
Atoms     Open Access  
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 7)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 6)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 2)
Biomaterials     Hybrid Journal   (Followers: 38)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 15)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 23)
Biophysical Reviews     Hybrid Journal  
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 2)
BMC Biophysics     Open Access   (Followers: 5)
Boson Journal of Modern Physics     Open Access  
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Bulletin of Materials Science     Open Access   (Followers: 41)
Bulletin of the Atomic Scientists     Full-text available via subscription   (Followers: 3)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal  
Caderno Brasileiro de Ensino de FĂ­sica     Open Access  
Canadian Journal of Physics     Full-text available via subscription   (Followers: 1)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 3)
Cells     Open Access   (Followers: 1)
CERN courier. International journal of high energy physics     Free   (Followers: 5)
Chemical Physics of Solid Surfaces     Full-text available via subscription  
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 3)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Chinese Physics B     Full-text available via subscription  
Chinese Physics C     Full-text available via subscription  
Chinese Physics Letters     Full-text available via subscription  
Cogent Physics     Open Access  
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Colloid Journal     Hybrid Journal   (Followers: 2)
Communications in Computational Physics     Full-text available via subscription   (Followers: 2)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Communications in Theoretical Physics     Full-text available via subscription   (Followers: 1)
Complex Analysis and its Synergies     Open Access   (Followers: 1)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 161)
Composites Part B : Engineering     Hybrid Journal   (Followers: 193)
Computational Astrophysics and Cosmology     Open Access  
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 20)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 1)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 1)
Computer Physics Communications     Hybrid Journal   (Followers: 2)
Contemporary Concepts of Condensed Matter Science     Full-text available via subscription  
Contemporary Physics     Hybrid Journal   (Followers: 15)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 5)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 2)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 4)
Cryogenics     Hybrid Journal   (Followers: 30)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 19)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Doklady Physics     Hybrid Journal   (Followers: 1)
Dynamical Properties of Solids     Full-text available via subscription  
ECS Journal of Solid State Science and Technology     Full-text available via subscription   (Followers: 3)
EDUSAINS     Open Access  
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 17)
EJNMMI Physics     Open Access  
Electrospinning     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 31)
Energy Procedia     Open Access   (Followers: 2)
Engineering Failure Analysis     Hybrid Journal   (Followers: 63)
Engineering Fracture Mechanics     Hybrid Journal   (Followers: 21)
Environmental Fluid Mechanics     Hybrid Journal   (Followers: 3)
EPJ Nonlinear Biomedical Physics     Open Access  
EPJ Quantum Technology     Open Access  
EPJ Techniques and Instrumentation     Full-text available via subscription  
EPJ Web of Conferences     Open Access  
European Journal of Physics     Full-text available via subscription   (Followers: 6)
European Journal of Physics Education     Open Access   (Followers: 3)
European Physical Journal - Applied Physics     Full-text available via subscription   (Followers: 7)
European Physical Journal C     Hybrid Journal   (Followers: 1)
Europhysics News     Open Access  
Experimental Mechanics     Hybrid Journal   (Followers: 20)
Experimental Methods in the Physical Sciences     Full-text available via subscription  
Experimental Techniques     Hybrid Journal   (Followers: 55)
Exploration Geophysics     Hybrid Journal   (Followers: 3)
Few-Body Systems     Hybrid Journal  
Fire and Materials     Hybrid Journal   (Followers: 5)
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 1)
Fluctuation and Noise Letters     Hybrid Journal   (Followers: 1)
Fluid Dynamics     Hybrid Journal   (Followers: 7)
Fortschritte der Physik/Progress of Physics     Hybrid Journal  
Frontiers in Physics     Open Access   (Followers: 4)
Frontiers of Materials Science     Hybrid Journal   (Followers: 3)
Frontiers of Physics     Hybrid Journal   (Followers: 1)
Fusion Engineering and Design     Hybrid Journal   (Followers: 9)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 24)
Geografiska Annaler, Series A: Physical Geography     Hybrid Journal   (Followers: 3)
Geophysical Research Letters     Full-text available via subscription   (Followers: 74)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 46)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 3)
Global Journal of Physics     Open Access   (Followers: 1)
Granular Matter     Hybrid Journal   (Followers: 1)
Graphs and Combinatorics     Hybrid Journal   (Followers: 6)
Gravitation and Cosmology     Hybrid Journal  
Handbook of Geophysical Exploration: Seismic Exploration     Full-text available via subscription  
Handbook of Metal Physics     Full-text available via subscription  
Handbook of Surface Science     Full-text available via subscription   (Followers: 2)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 2)
Heat Transfer - Asian Research     Hybrid Journal   (Followers: 7)
High Energy Density Physics     Hybrid Journal   (Followers: 1)
High Pressure Research: An International Journal     Hybrid Journal   (Followers: 3)
IEEE Journal of Quantum Electronics     Hybrid Journal   (Followers: 18)
IEEE Signal Processing Magazine     Full-text available via subscription   (Followers: 55)
IET Optoelectronics     Hybrid Journal   (Followers: 1)
Il Colle di Galileo     Open Access  
Imaging Science Journal     Hybrid Journal   (Followers: 2)
Indian Journal of Biochemistry and Biophysics (IJBB)     Open Access   (Followers: 3)
Indian Journal of Physics     Hybrid Journal   (Followers: 3)
Indian Journal of Pure & Applied Physics (IJPAP)     Open Access   (Followers: 11)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 10)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 20)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Infinite Dimensional Analysis, Quantum Probability and Related Topics     Hybrid Journal  
InfraMatics     Open Access  
Infrared Physics & Technology     Hybrid Journal  
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 6)
Intermetallics     Hybrid Journal   (Followers: 23)
International Applied Mechanics     Hybrid Journal   (Followers: 3)
International Geophysics     Full-text available via subscription   (Followers: 3)
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 2)
International Journal for Computational Methods in Engineering Science and Mechanics     Hybrid Journal   (Followers: 10)
International Journal for Ion Mobility Spectrometry     Hybrid Journal   (Followers: 1)
International Journal for Simulation and Multidisciplinary Design Optimization     Full-text available via subscription   (Followers: 1)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Full-text available via subscription   (Followers: 27)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 3)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 4)
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 6)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Fatigue     Hybrid Journal   (Followers: 36)
International Journal of Fracture     Hybrid Journal   (Followers: 11)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 1)
International Journal of Geophysics     Open Access   (Followers: 5)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 31)
International Journal of Low Radiation     Hybrid Journal  
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 15)
International Journal of Material Forming     Hybrid Journal  
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 4)
International Journal of Mechanical Sciences     Hybrid Journal   (Followers: 9)
International Journal of Mechanics and Materials in Design     Hybrid Journal   (Followers: 4)

        1 2 3 | Last

Journal Cover Chinese Physics C
  [SJR: 0.367]   [H-I: 12]   [0 followers]  Follow
    
   Full-text available via subscription Subscription journal
   ISSN (Print) 1674-1137
   Published by IOP Homepage  [71 journals]
  • Heavy-light mesons in a relativistic model
    • Authors: Jing-Bin Liu; Mao-Zhi Yang
      First page: 073101
      Abstract: We study the heavy-light mesons in a relativistic model, which is derived from the Bethe-Salpeter equation by applying the Foldy-Wouthuysen transformation to the heavy quark. The kernel we choose is based on scalar confinement and vector Coulomb potentials. The transverse interaction of the gluon exchange is also taken into account in this model. The spectra and wave functions of D, D s , B, B s meson states are obtained. The spectra are calculated up to the order of 1/ m Q , and wave functions are treated to leading order.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Detection of supernova neutrinos at spallation neutron sources
    • Authors: Ming-Yang Huang; Xin-Heng Guo Bing-Lin Young
      First page: 073102
      Abstract: After considering supernova shock effects, Mikheyev-Smirnov-Wolfenstein effects, neutrino collective effects, and Earth matter effects, the detection of supernova neutrinos at the China Spallation Neutron Source is studied and the expected numbers of different flavor supernova neutrinos observed through various reaction channels are calculated with the neutrino energy spectra described by the Fermi-Dirac distribution and the “beta fit” distribution respectively. Furthermore, the numerical calculation method of supernova neutrino detection on Earth is applied to some other spallation neutron sources, and the total expected numbers of supernova neutrinos observed through different reactions channels are given.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Direct pion emission in D *+ → D + π decays
    • Authors: Xing-Dao Guo; Xue-Wen Liu, Hong-Wei Ke Xue-Qian Li
      First page: 073103
      Abstract: The QCD multipole expansion (QCDME) is based on quantum field theory and has been extensively applied to study transitions among ϒ and ψ family members. As it refers to non-perturbative QCD, however, it has only a certain application range. Even though it successfully explains the transition data among members of the ϒ (ψ) family, as Eichten indicates, beyond the production threshold of mediate states it fails to match data by several orders of magnitude. In this work, by studying a simple decay mode D*→ D + π 0 , where a pion may be emitted before D* transitions into D , we analyze the contribution of QCD multipole expansion. As the D π portal is open, the dominant contribution is an OZI-allowed process where a light quark-pair is excited out from vacuum, and its contribution can be evaluated by the 3 P 0 model. Since direct pion emission is OZI-suppressed and violates isospin conservation, its contribution must be much smaller ...
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Study of the rare decay J/ψ → e + e − ϕ
    • Authors: Xing-Dao Guo; Si-Run Xue, Hong-Wei Ke, Xue-Qian Li Qiang Zhao
      First page: 073104
      Abstract: We study the decay process of J/ψ → e + e − ϕ where the relatively clean electromagnetic (EM) transitions appear at leading order at tree level while the hadronic contributions only emerge via hadronic loop transitions. We include the low-lying scalar f 0 (980) and pseudoscalar η/η′ as the dominant contributions in the evaluation of the hadronic loop contributions. It is found that the hadronic effects are negligible compared with the EM contributions. The decay width of J/ψ → e + e − ϕ is determined to be about 2.12 × 10 −6 keV if there is no other leading mechanism contributing. This result will be tested by the BESIII experiment with a large J/ψ data sample.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • ρ meson decays of heavy hybrid mesons
    • Authors: Liang Zhang; Peng-Zhi Huang
      First page: 073105
      Abstract: We calculate the ρ meson couplings between the heavy hybrid doublets H h /S h /M h /T h and the ordinary qQ̅ doublets in the framework of the light-cone QCD sum rule. The sum rules obtained rely mildly on the Borel parameters in their working regions. The resulting coupling constants are rather small in most cases.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Diquark mass differences from unquenched lattice QCD
    • Authors: Yujiang Bi; Hao Cai, Ying Chen, Ming Gong, Zhaofeng Liu, Hao-Xue Qiao Yi-Bo Yang
      First page: 073106
      Abstract: We calculate diquark correlation functions in the Landau gauge on the lattice using overlap valence quarks and 2+1-flavor domain wall fermion configurations. Quark masses are extracted from the scalar part of quark propagators in the Landau gauge. The scalar diquark quark mass difference and axial vector scalar diquark mass difference are obtained for diquarks composed of two light quarks and of a strange and a light quark. The light sea quark mass dependence of the results is examined. Two lattice spacings are used to check the discretization effects. The coarse and fine lattices are of sizes 24 3 × 64 and 32 3 × 64 with inverse spacings 1/ a = 1.75(4) GeV and 2.33(5) GeV, respectively.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Evolution of N = 28 shell closure in relativistic continuum
           Hartree-Bogoliubov theory
    • Authors: Xue-Wei Xia
      First page: 074101
      Abstract: The N = 28 shell gap in sulfur, argon, calcium and titanium isotopes is investigated in the framework of relativistic continuum Hartree-Bogoliubov (RCHB) theory. The evolutions of neutron shell gap, separation energy, single particle energy and pairing energy are analyzed, and it is found that the N = 28 shell gap is quenched in sulfur isotopes but persists in argon, calcium and titanium isotopes. The evolution of the N = 28 shell gap in the N = 28 isotonic chain is discussed, and the erosion of the N = 28 shell gap is understood with the evolution of potential with proton number.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Influence of binding energies of electrons on nuclear mass predictions
    • Authors: Jing Tang; Zhong-Ming Niu Jian-You Guo
      First page: 074102
      Abstract: Nuclear mass contains a wealth of nuclear structure information, and has been widely employed to extract the nuclear effective interactions. The known nuclear mass is usually extracted from the experimental atomic mass by subtracting the masses of electrons and adding the binding energy of electrons in the atom. However, the binding energies of electrons are sometimes neglected in extracting the known nuclear masses. The influence of binding energies of electrons on nuclear mass predictions are carefully investigated in this work. If the binding energies of electrons are directly subtracted from the theoretical mass predictions, the rms deviations of nuclear mass predictions with respect to the known data are increased by about 200 keV for nuclei with Z, N ⩾ 8. Furthermore, by using the Coulomb energies between protons to absorb the binding energies of electrons, their influence on the rms deviations is significantly reduced to only about 10 keV for nuclei with Z, N
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Spectra and electromagnetic transitions of 72–84 Kr in the
           interacting boson model-1
    • First page: 074103
      Abstract: Within the framework of the interacting boson model-1, the energy levels and electromagnetic transitions in 72–84 Kr isotopes are calculated. The structures of the eigenstate and Hamiltonian matrix for some low-lying states are also calculated. The calculated results are compared with available experimental data, and the results are generally in good agreement. The present study shows that the 72,74,76,80,82,84 Kr isotopes are in the transition from U (5) → SU (3), and 78 Kr is in the transition from U (5) → O(6).
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • A combined model for pseudorapidity distributions in p-p collisions at
           center-of-mass energies from 23.6 to 7000 GeV
    • Authors: Zhi-Jin Jiang; Yan Huang Jie Wang
      First page: 074104
      Abstract: In p-p collisions, the charged particles produced consist of two leading particles and those frozen out from the hot and dense matter created in the collisions. The two leading particles are in the projectile and target fragmentation regions, respectively, which, in this paper, are conventionally supposed to have Gaussian rapidity distributions. The hot and dense matter is assumed to expand according to unified hydrodynamics, a hydrodynamic model which unifies the features of the Landau and Hwa-Bjorken models, and freeze out into charged particles from a space-like hypersurface with a fixed proper time of τ FO . The rapidity distribution of these charged particles can be derived analytically. The combined contribution from both leading particles and unified hydrodynamics is then compared against experimental data from a now available center-of-mass energy region from 23.6 to 7000 GeV. The model predictions are consistent with experimental measurements.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Sensitivity study of (10,100) GeV gamma-ray bursts with double shower
           front events from ARGO-YBJ
    • Authors: Xun-Xiu Zhou; Lan-Lan Gao, Yu Zhang, Yi-Qing Guo, Qing-Qi Zhu, Huan-Yu Jia Dai-Hui Huang
      First page: 075001
      Abstract: ARGO-YBJ, located at the Yangbajing Cosmic Ray Observatory (4300 m a.s.l., Tibet, China), is a full coverage air shower array, with an energy threshold of ∼300 GeV for gamma-ray astronomy. Most of the recorded events are single front showers, satisfying the trigger requirement of at least 20 particles detected in a given time window. However, in ∼11.5% of the events, two randomly arriving showers may be recorded in the same time window, and the second one, generally smaller, does not need to satisfy the trigger condition. These events are called double shower front events. By using these small showers, well under the trigger threshold, the detector primary energy threshold can be lowered to a few tens of GeV. In this paper, the angular resolution that can be achieved with these events is evaluated by a full Monte Carlo simulation. The ARGO-YBJ sensitivity in detecting gamma-ray bursts (GRBs) by using double shower front events is also studied for various cutoff energies, time du...
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Large angular scale CMB anisotropy from an excited initial mode
    • Authors: A. Sojasi; M. Mohsenzadeh E. Yusofi
      First page: 075101
      Abstract: According to inflationary cosmology, the CMB anisotropy gives an opportunity to test predictions of new physics hypotheses. The initial state of quantum fluctuations is one of the important options at high energy scale, as it can affect observables such as the CMB power spectrum. In this study a quasi-de Sitter inflationary background with approximate de Sitter mode function built over the Bunch-Davies mode is applied to investigate the scale-dependency of the CMB anisotropy. The recent Planck constraint on spectral index motivated us to examine the effect of a new excited mode function (instead of pure de Sitter mode) on the CMB anisotropy at large angular scales. In so doing, it is found that the angular scale-invariance in the CMB temperature fluctuations is broken and in the limit ℓ < 200 a tiny deviation appears. Also, it is shown that the power spectrum of CMB anisotropy is dependent on a free parameter with mass dimension H
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Upgrade of beam energy measurement system at BEPC-II
    • Authors: Jian-Yong Zhang; Xiao Cai, Xiao-Hu Mo, Di-Zhou Guo, Jian-Li Wang, Bai-Qi Liu, M. N. Achasov, A. A. Krasnov, N.Yu. Muchnoi, E. E. Pyata, E. V. Mamoshkina F. A. Harris
      First page: 076001
      Abstract: The beam energy measurement system is of great importance for both BEPC-II accelerator and BES-III detector. The system is based on measuring the energies of Compton back-scattered photons. In order to meet the requirements of data taking and improve the measurement accuracy, the system has continued to be upgraded, which involves the updating of laser and optics subsystems, replacement of a view-port of the laser to the vacuum insertion subsystem, the use of an electric cooling system for a high purity germanium detector, and improvement of the data acquisition and processing subsystem. The upgrade system guarantees the smooth and efficient measurement of beam energy at BEPC-II and enables accurate offline energy values for further physics analysis at BES-III.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Study of a nTHGEM-based thermal neutron detector
    • Authors: Ke Li; Jian-Rong Zhou, Xiao-Dong Wang, Tao Xiong, Ying Zhang, Yu-Guang Xie, Liang Zhou, Hong Xu, Gui-An Yang, Yan-Feng Wang, Yan Wang, Jin-Jie Wu, Zhi-Jia Sun Bi-Tao Hu
      First page: 076002
      Abstract: With new generation neutron sources, traditional neutron detectors cannot satisfy the demands of the applications, especially under high flux. Furthermore, facing the global crisis in 3 He gas supply, research on new types of neutron detector as an alternative to 3 He is a research hotspot in the field of particle detection. GEM (Gaseous Electron Multiplier) neutron detectors have high counting rate, good spatial and time resolution, and could be one future direction of the development of neutron detectors. In this paper, the physical process of neutron detection is simulated with Geant4 code, studying the relations between thermal conversion efficiency, boron thickness and number of boron layers. Due to the special characteristics of neutron detection, we have developed a novel type of special ceramic nTHGEM (neutron THick GEM) for neutron detection. The performance of the nTHGEM working in different Ar/CO 2 mixtures is presented, including measure...
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Prototype of readout electronics for the LHAASO KM2A electromagnetic
           particle detectors
    • Authors: Xiang Liu; Jing-Fan Chang, Zheng Wang Lei Fan
      First page: 076101
      Abstract: The KM2A (one kilometer square extensive air shower array) is the largest detector array in the LHAASO (Large High Altitude Air Shower Observatory) project. The KM2A consists of 5242 EDs (Electromagnetic particle Detectors) and 1221 MDs (Muon Detectors). The EDs are distributed and exposed in the wild. Two channels, anode and dynode, are employed for the PMT (photomultiplier tube) signal readout. The readout electronics designed in this paper aims at accurate charge and arrival time measurement of the PMT signals, which cover a large amplitude range from 20 P.E. (photoelectrons) to 2 × 10 5 P.E. By using a “trigger-less” architecture, we digitize signals close to the PMTs. All digitized data is transmitted to DAQ (Data Acquisition) via a simplified White Rabbit protocol. Compared with traditional high energy experiments, high precision of time measurement over such a large area and suppression of temperature effects in the wild become the key techniques. Experiments sh...
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Non-ideal effects of MOS capacitor in a switched capacitor waveform
           recorder ASIC
    • Authors: Hong-Yan Zhang; Zhi Deng Yi-Nong Liu
      First page: 076102
      Abstract: SCAs (Switched Capacitor Arrays) have a wide range of uses, especially in high energy physics, nuclear science and astrophysics experiments. This paper presents a method of using a MOS capacitor as a sampling capacitor to gain larger capacitance with small capacitor area in SCA design. It studies the non-ideal effects of the MOS capacitor and comes up with ways to reduce these adverse effects. A prototype SCA ASIC which uses a MOS capacitor to store the samples has been designed and tested to verify this method. The SCA integrates 32 channels and each has 64 cells and a readout amplifier. The stored voltage is converted to a pair of differential currents (±4 mA max) and multiplexed to the output. All the functionalities have been verified. The power consumption is less than 2 mW/ch. The INL of all the cells in one channel are better than 0.39%. The equivalent input noise of the SCA has been tested to be 2.2 mV with 625 kHz full-scale sine wave as input, sampling at 40 MSPS (Mega...
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • A capture-gated fast neutron detection method
    • Authors: Yi Liu; Yi-Gang Yang, Yang Tai Zhi Zhang
      First page: 076201
      Abstract: To address the problem of the shortage of neutron detectors used in radiation portal monitors (RPMs), caused by the 3 He supply crisis, research on a cadmium-based capture-gated fast neutron detector is presented in this paper. The detector is composed of many 1 cm × 1 cm × 20 cm plastic scintillator cuboids covered by 0.1 mm thick film of cadmium. The detector uses cadmium to absorb thermal neutrons and produce capture γ-rays to indicate the detection of neutrons, and uses plastic scintillator to moderate neutrons and register γ-rays. This design removes the volume competing relationship in traditional 3 He counter-based fast neutron detectors, which hinders enhancement of the neutron detection efficiency. Detection efficiency of 21.66% ± 1.22% has been achieved with a 40.4 cm × 40.4 cm × 20 cm overall detector volume. This detector can measure both neutrons and γ-rays simultaneously. A small detector (20.2 cm × 20.2 cm × 20 cm) demonstrated a 3.3 % false al...
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Spot size measurement of a flash-radiography source using the pinhole
           imaging method
    • Authors: Yi Wang; Qin Li, Nan Chen, Jin-Ming Cheng, Yu-Tong Xie, Yun-Long Liu Quan-Hong Long
      First page: 076202
      Abstract: The spot size of the X-ray source is a key parameter of a flash-radiography facility, and is usually quoted as an evaluation of the resolving power. The pinhole imaging technique is applied to measure the spot size of the Dragon-I linear induction accelerator, by which a two-dimensional spatial distribution of the source spot is obtained. Experimental measurements are performed to measure the spot image when the transportation and focusing of the electron beam are tuned by adjusting the currents of solenoids in the downstream section. The spot size of full-width at half maximum and that defined from the spatial frequency at half peak value of the modulation transfer function are calculated and discussed.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Monitoring method for neutron flux for a spallation target in an
           accelerator driven sub-critical system
    • Authors: Qiang Zhao; Zhi-Yong He, Lei Yang, Xue-Ying Zhang, Wen-Juan Cui, Zhi-Qiang Chen Hu-Shan Xu
      First page: 076203
      Abstract: In this paper, we study a monitoring method for neutron flux for the spallation target used in an accelerator driven sub-critical (ADS) system, where a spallation target located vertically at the centre of a sub-critical core is bombarded vertically by high-energy protons from an accelerator. First, by considering the characteristics in the spatial variation of neutron flux from the spallation target, we propose a multi-point measurement technique, i.e. the spallation neutron flux should be measured at multiple vertical locations. To explain why the flux should be measured at multiple locations, we have studied neutron production from a tungsten target bombarded by a 250 MeV-proton beam with Geant4-based Monte Carlo simulations. The simulation results indicate that the neutron flux at the central location is up to three orders of magnitude higher than the flux at lower locations. Secondly, we have developed an effective technique in order to measure the spallation neutron flux w...
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Development and prospects of Very Small Angle Neutron Scattering (VSANS)
           techniques
    • Authors: Tai-Sen Zuo; He Cheng, Yuan-Bo Chen Fang-Wei Wang
      First page: 076204
      Abstract: Very Small Angle Neutron Scattering (VSANS) is an upgrade of the traditional Small Angle Neutron Scattering (SANS) technique which can cover three orders of magnitude of length scale from one nanometer to one micrometer. It is a powerful tool for structure calibration in polymer science, biology, material science and condensed matter physics. Since the first VSANS instrument, D11 in Grenoble, was built in 1972, new collimation techniques, focusing optics (multi-beam converging apertures, material or magnetic lenses, and focusing mirrors) and higher resolution detectors combined with the long flight paths and long incident neutron wavelengths have been developed. In this paper, a detailed review is given of the development, principles and application conditions of various VSANS techniques. Then, beam current gain factors are calculated to evaluate those techniques. A VSANS design for the China Spallation Neutron Source (CSNS) is thereby presented.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • High power acceleration of an HSC type injector for cancer therapy
    • Authors: Liang Lu; Toshiyuki Hattori, Huan-Yu Zhao, Katsunori Kawasaki, Lie-Peng Sun, Qian-Yu Jin, Jun-Jie Zhang, Liang-Ting Sun, Yuan He Hong-Wei Zhao
      First page: 077001
      Abstract: A hybrid single cavity (HSC) linac, which is formed by combining a radio frequency quadrupole (RFQ) and a drift tube (DT) structure into one interdigital-H (IH) cavity, is fabricated and assembled as a proof of principle injector for cancer therapy synchrotron, based on the culmination of several years of research. The HSC linac adopts a direct plasma injection scheme (DPIS), which can inject a high intensity heavy ion beam produced by a laser ion source (LIS). The input beam current of the HSC is designed to be 20 mA C 6+ ions. According to numerical simulations, the HSC linac can accelerate a 6-mA C 6+ beam, which meets the requirement of the needed particle number for cancer therapy (10 8–9 ions/pulse). The HSC injector with the DPIS method makes the existing multi-turn injection system and stripping system unnecessary, and can also bring down the size of the beam pipe in existing synchrotron magnets, which could reduce the whole cost of synchrotr...
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Improving nonlinear performance of the HEPS baseline design with a genetic
           algorithm
    • Authors: Yi Jiao
      First page: 077002
      Abstract: A baseline design for the High Energy Photon Source has been proposed, with a natural emittance of 60 pm·rad within a circumference of about 1.3 kilometers. Nevertheless, the nonlinear performance of the design needs further improvements to increase both the dynamic aperture and the momentum acceptance. In this study, genetic optimization of the linear optics is performed, so as to find all the possible solutions with weaker sextupoles and hence weaker nonlinearities, while keeping the emittance at the same level as the baseline design. The solutions obtained enable us to explore the dependence of nonlinear dynamics on the working point. The result indicates that with the same layout, it is feasible to obtain much better nonlinear performance with a delicate tuning of the magnetic field strengths and a wise choice of the working point.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Beam-based calibrations of the BPM offset at C-ADS Injector II
    • Authors: Wei-Long Chen; Zhi-Jun Wang, Chi Feng, Wei-Ping Dou, Yue Tao, Huan Jia, Wang-Sheng Wang, Shu-Hui Liu Yuan He
      First page: 077003
      Abstract: Beam-based BPM offset calibration was carried out for Injector II at the C-ADS demonstration facility at the Institute of Modern Physics (IMP), Chinese Academy of Science (CAS). By using the steering coils integrated in the quadrupoles, the beam orbit can be effectively adjusted and BPM positions recorded at the Medium Energy Beam Transport of the Injector II Linac. The studies were done with a 2 mA, 2.1 MeV proton beam in pulsed mode. During the studies, the “null comparison method” was applied for the calibration. This method is less sensitive to errors compared with the traditional transmission matrix method. In addition, the quadrupole magnet’s center can also be calibrated with this method.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Design and evaluation of a downconverter based on MicroTCA.4
    • Authors: Nan Gan; Rong Liu, Xin-Peng Ma Yun-Long Chi
      First page: 077004
      Abstract: Modern low-level RF (LLRF) control systems of particle accelerators are designed to achieve extremely precise field amplitude and phase regulation inside the accelerating cavities. The RF field signal is usually converted to an intermediate frequency (IF) before being sampled by ADC. As the down-conversion is an important procedure of digital signal processing in LLRF system, designing a high performance and broad band downconverter compatible with various accelerators is important. In this paper, the design of a downconverter based on MicroTCA and its performance evaluation on different frequency points are presented. The major design objective of this module is a wider operating frequency range and more flexibility in application.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
  • Thermal stability and separation characteristics of anti-sticking layers
           of Pt/Cr films for the hot slumping technique
    • Authors: Shuang Ma; Ming-Wu Wen Zhan-Shan Wang
      First page: 079001
      Abstract: The thermal stability and separation characteristics of anti-sticking layers of Pt/Cr films are studied in this paper. Several types of adhesion layers were investigated: 10.0 nm Pt, 1.5 nm Cr + 50.0 nm Pt, 2.5 nm Cr + 50.0 nm Pt and 3.5 nm Cr + 50.0 nm Pt fabricated using direct current magnetron sputtering. The variation of layer thickness, roughness, crystallization and surface topography of Pt/Cr films were analyzed by grazing incidence X-ray reflectometry, large angle X-ray diffraction and optical profiler before and after heating. 2.5 nm Cr + 50.0 nm Pt film exhibits the best thermal stability and separation characteristics according to the heating and hot slumping experiments. The film was also applied as an anti-sticking layer to optimize the maximum temperature of the hot slumping technique.
      Citation: Chinese Physics C
      PubDate: 2016-06-28T23:00:00Z
      Issue No: Vol. 40, No. 7 (2016)
       
 
 
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