2011 Vol. 35, No. 2

Letter
Large transverse momentum dilepton production in heavy ion collisions with two-photon processes
FU Yong-Ping, LI Yun-De
2011, 35(2): 109-112. doi: 10.1088/1674-1137/35/2/001
Abstract:
The cold component of large transverse momentum dilepton production via semi-coherent two-photon interaction is calculated. The cold contribution is essential to the dilepton spectra in the soft region for different mass bins. The results are compare...
Particle and field theory
Possible heavy molecular states composed of a pair of excited charm-strange mesons
HU Bin, CHEN Xiao-Lin, LUO Zhi-Gang, HUANG Peng-Zhi, ZHU Shi-Lin, YU Peng-Fei, LIU Xiang
2011, 35(2): 113-125. doi: 10.1088/1674-1137/35/2/002
Abstract:
The P-wave charm-strange mesons Ds0(2317) and Ds1(2460) lie below the DK and D* K threshold respectively. They are extremely narrow because their strong decays violate the isospin symmetry. We study the possible heavy molecular states composed of a p...
One-loop QCD contribution to the potential of QQ
LIU Li-Quan, ZHAO Shu-Min, ZHANG Jian-Jun, YANG Bao-Zhu, HUANG De-Bao
2011, 35(2): 126-129. doi: 10.1088/1674-1137/35/2/003
Abstract:
Without the non-relativistic approximation in one-loop function, the dominating one-loop contribution to the quark-antiquark potential is studied numerically in terms of perturbative Quantum Chromo Dynamics (QCD). For Coulomb-like potential, the rati...
Dynamical CP violation of the generalized Yang-Mills model
WANG Dian-Fu, SUN Xiao-Yu, CHANG Xiao-Jing
2011, 35(2): 130-134. doi: 10.1088/1674-1137/35/2/004
Abstract:
Starting from the generalized Yang-Mills model which contains, besides the vector part Vμ, also a scalar part S and a pseudoscalar part P. It is shown, in terms of the Nambu-Jona-Lasinio (NJL) mechanism, that CP violation can be realized dynamically....
Controllable entanglement sudden birth of Heisenberg spins
ZHENG Qiang, ZHI Qi-Jun, ZHANG Xiao-Ping, REN Zhong-Zhou
2011, 35(2): 135-138. doi: 10.1088/1674-1137/35/2/005
Abstract:
We investigate the Entanglement Sudden Birth (ESB) of two Heisenberg spins A and B. The third controller, qutrit C is introduced, which only has the Dzyaloshinskii-Moriya (DM) spin-orbit interaction with qubit B. We find that the DM interaction is ne...
Spin path integral and quantum mechanics in the rotating frame of reference
CHEN Tong, WU Ning, YU Yue
2011, 35(2): 139-143. doi: 10.1088/1674-1137/35/2/006
Abstract:
We have developed a path integral formalism of the quantum mechanics in the rotating frame of reference, and proposed a path integral description of spin degrees of freedom, which is connected to the Schwinger bosons realization of the angular moment...
Quantum phase transitions about parity breaking in matrix product systems
ZHU Jing-Min
2011, 35(2): 144-148. doi: 10.1088/1674-1137/35/2/007
Abstract:
According to our scheme to construct quantum phase transitions (QPTs) in spin chain systems with matrix product ground states, we first successfully combine matrix product state (MPS) QPTs with spontaneous symmetry breaking. For a concrete model, we ...
A result on certain coset subalgebras of the βγ-system
CHU Yan-Jun, HUANG Fang, ZHENG Zhu-Jun
2011, 35(2): 149-152. doi: 10.1088/1674-1137/35/2/008
Abstract:
In this paper, for the highest weight module V4 of sl(2,C) with the highest weight 4, we describe subalgebras Sβ(V4)θ+ and Sγ(V4)θ+ of the βγ-system coset S(V4)θ+ by giving their generators. These coset subalgebras are interesting, new examples of st...
particle and nuclear astrophysics and cosmology
Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment
FENG Zhao-Yang, ZHANG Yi, LIU Cheng, FAN Chao, LI Hong-Chao, WANG Bo, WU Han-Rong, HU Hong-Bo, LU Hong, TAN You-Heng
2011, 35(2): 153-157. doi: 10.1088/1674-1137/35/2/009
Abstract:
A γ/hadron separation analysis is described for the observed air shower events with primary energy above 100 TeV based on the Tibet ASγ detector configuration. The shower age and size parameters are fitted from the measured lateral density distributi...
Nuclear and ion Physics
Quantitative conditions for the formation of p-wave neutron halos
GUO Yan-Qing, SONG Jie
2011, 35(2): 158-162. doi: 10.1088/1674-1137/35/2/010
Abstract:
With the experimental binding energies and configurations, the root-mean-square radii of p-wave valence neutron distributions for nuclei up to the second p-shell have been calculated in the framework of the single-particle potential model. By analyzi...
Detection Technology and Methods
Micromegas prototypes with thermo-bond film separators
GUAN Liang, TANG Hao-Hui, GUO Jun-Jun, WANG Xiao-Lian, XU Zi-Zong, ZHAO Tian-Chi
2011, 35(2): 163-168. doi: 10.1088/1674-1137/35/2/011
Abstract:
In this paper we report the results of Micromegas prototypes constructed by attaching micromesh to an anode using thermo-bond films. The excellent metal attaching ability and good dielectical property of this kind of film make it a promising material...
Effects of orientation of substrate on the enhanced low-dose-rate sensitivity (ELDRS) in NPN transistors
LU Wu, ZHENG Yu-Zhan, WANG Yi-Yuan, REN Di-Yuan, GUO Qi, WANG Zhi-Kuan, WANG Jian-An
2011, 35(2): 169-173. doi: 10.1088/1674-1137/35/2/012
Abstract:
The radiation effects and annealing characteristics of two types of domestic NPN bipolar junction transistors, fabricated with different orientations, were investigated under different dose-rate irradiation. The experimental results show that both ty...
Experimental studies of micromegas detectors with different micro-meshes
YANG He-Run, HU Bi-Tao, ZHANG Xiao-Dong, ZOU Chun-Yan
2011, 35(2): 174-178. doi: 10.1088/1674-1137/35/2/013
Abstract:
The structure of micromegas (micro-mesh gaseous structure) detectors with different micro-meshes of stainless steel wire woven netting and Ni foil has been presented. The counting rates, energy resolution, gain, discharge probability and time resolut...
Accelerator
Analysis of superconducting cavity quench events at SSRF
HOU Hong-Tao, LIU Jian-Fei, ZHAO Yu-Bin, ZHAO Shen-Jie, ZHANG Zhi-Gang, LUO Chen, FENG Zi-Qiang, MAO Dong-Qing, ZHENG Xiang, LI Zheng
2011, 35(2): 179-182. doi: 10.1088/1674-1137/35/2/014
Abstract:
Quench is important and dangerous to superconducting RF cavities. This paper illustrates the mechanism of quench and how a quench detector works, and analyzes the quench events happening during beam operations and cavity conditioning. We find that th...
Simulation and analysis of the transverse spectrum in HIRFL-CSR
LI Peng, YUAN You-Jin, MAO Li-Jun, YANG Jian-Cheng, LI Guo-Hong, YIN Da-Yu, LI Jie, LI Xiao-Ni, CHAI Wei-Ping, SHI Jian
2011, 35(2): 183-187. doi: 10.1088/1674-1137/35/2/015
Abstract:
Particles in a storage ring oscillate in the longitudinal and transverse dimensions. Therefore, the signal that beam has generated can be analyzed in the frequency domain to extract many beam parameters, such as tune, momentum spread, emittance and t...
Study on the HOMs coupler design of spoke cavity
XIAO Yong-Chuan, YIN Xue-Jun, MU Zhen-Cheng, FU Shi-Nian
2011, 35(2): 188-192. doi: 10.1088/1674-1137/35/2/016
Abstract:
The superconducting spoke cavity has been proposed to accelerate the proton in the low energy section of high power proton linac for an Accelerator Driven Sub-critical System (ADS). Considering that the High Order Modes (HOMs) in the superconducting ...
Design of triode extraction system for a dual hollow cathode ion source
WANG Jing-Hui, ZHU Kun, ZHAO Wei-Jiang, LIU Ke-Xin
2011, 35(2): 193-198. doi: 10.1088/1674-1137/35/2/017
Abstract:
A triode extraction system is designed for a dual hollow cathode ion source being developed at the Institute of Heavy Ion Physics, Peking University. Basic parameters of the plasma are selected after examining the operation principle of the ion sourc...
Synchrotron radiation,applications of nuclear techniquees,etc
Total electron yield mode for XANES measurements in the energy region of 2.1--6.0 keV
ZHENG Lei, ZHAO Yi-Dong, TANG Kun, MA Chen-Yan, HAN Yong, CUI Ming-Qi
2011, 35(2): 199-202. doi: 10.1088/1674-1137/35/2/018
Abstract:
The total electron yield (TEY) mode has been developed successfully for XANES measurements at Beamline 4B7A of BSRF (Beijing Synchrotron Radiation Facility). Its performance was studied by measuring sulphur K-edge XANES of three CdS samples (mixed wi...
Spectral distributions of the scattered photons within an acceptance angle in Thomson scattering
WANG Jun, HUANG Wen-Hui
2011, 35(2): 203-208. doi: 10.1088/1674-1137/35/2/019
Abstract:
In this paper, we present the analysis of the spectral distributions of the scattered photons within a certain acceptance angle in Thomson scattering, in which the beam divergence, energy spread and spatial distribution are all considered. The analyt...

ISSN 1674-1137 CN 11-5641/O4

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