2015 Vol. 39, No. 5

Probing the mass degeneracy of particles with different spins
ZHANG Zhen-Hua, LÜ Gang, WEI Ke-Wei
2015, 39(5): 053101. doi: 10.1088/1674-1137/39/5/053101
Abstract:
The spin is an important property of a particle. Although it is unlikely, there is still a possibility that two particles with di erent spins share similar masses. In this paper, we propose a method to probe this kind of mass degeneracy of particles ...
Unified Hamiltonian model for mesons and baryons
XIE Wei, WANG Ping
2015, 39(5): 053102. doi: 10.1088/1674-1137/39/5/053102
Abstract:
A new Hamiltonian model is introduced to study the spectrum of light hadrons. It combines relativistic field theory with elements of the constituent quark model. In addition to the standard linear confining and pseudoscalar meson exchange interaction...
Nuclear
Experimental spectra analysis in THM with the help of simulation based on the Geant4 framework
LI Cheng-Bo, WEN Qun-Gang, ZHOU Shu-Hua, JIANG Zong-Jun, FU Yuan-Yong, ZHOU Jing, MENG Qiu-Ying, WANG Xiao-Lian
2015, 39(5): 054001. doi: 10.1088/1674-1137/39/5/054001
Abstract:
The Coulomb barrier and electron screening cause difficulties in directly measuring nuclear reaction cross sections of charged particles at astrophysical energies. The Trojan-horse method (THM) has been introduced to solve the difficulties as a power...
Prompt fission neutron spectra of n+235U above the (n,nf) fission threshold
SHU Neng-Chuan, JIA Min, CHEN Yong-Jing, LIU Ting-Jin
2015, 39(5): 054101. doi: 10.1088/1674-1137/39/5/054101
Abstract:
Calculations of prompt fission neutron spectra (PFNS) from the 235U(n, f) reaction were performed with a semi-empirical method for En=7.0 and 14.7 MeV neutron energies. The total PFNS were obtained as a superposition of (n,xnf) pre-fission neutron sp...
Study of different features of fission dynamics of 224Th produced in fusion reactions within a stochastic approach
H. Eslamizadeh
2015, 39(5): 054102. doi: 10.1088/1674-1137/39/5/054102
Abstract:
The evaporation residue cross section anisotropy of the fission fragment angular distribution, pre-scission neutron multiplicity and the pre-saddle and post-saddle contributions of the pre-scission neutron multiplicity were analyzed within a stochast...
No-core Monte Carlo shell model calculations with unitary correlation operator method and similarity renormalization group
LIU Lang
2015, 39(5): 054103. doi: 10.1088/1674-1137/39/5/054103
Abstract:
The unitary correlation operator method (UCOM) and the similarity renormalization group theory (SRG) are compared and discussed in the framework of the no-core Monte Carlo shell model (MCSM) calculations for 3H and 4He. The treatment of spurious cent...
Modified fusion probability by reflection boundary
HAN Jie, BAO Jing-Dong
2015, 39(5): 054104. doi: 10.1088/1674-1137/39/5/054104
Abstract:
We investigate the time-dependent probability for a Brownian particle passing over the barrier to stay at a metastable potential pocket against escaping over the barrier. This is related to the whole fusion-fission dynamical process and can be called...
Wobbling geometry in a simple triaxial rotor
SHI Wen-Xian, CHEN Qi-Bo
2015, 39(5): 054105. doi: 10.1088/1674-1137/39/5/054105
Abstract:
The spectroscopic properties and angular momentum geometry of the wobbling motion of a simple triaxial rotor are investigated within the triaxial rotor model. The obtained exact solutions of energy spectra and reduced quadrupole transition probabilit...
particle and nuclear astrophysics and cosmology
Quadrupole-octopole alignment of CMB related to the primordial power spectrum with dipolar modulation in anisotropic spacetime
CHANG Zhe, LI Xin, WANG Sai
2015, 39(5): 055101. doi: 10.1088/1674-1137/39/5/055101
Abstract:
The WMAP and Planck observations show that the quadrupole and octopole orientations of the CMB might align with each other. We reveal that the quadrupole-octopole alignment is a natural implication of the primordial power spectrum in an anisotropic s...
Detection Technology , Electronics and Methods
A measurement system for alpha and beta surface emissionrate using MWPC
LIN Ye, FANG Fang, REN Jia-Fu, HE Lin-Feng, TANG Fang-Dong, XU Yi-He, DING Wei-Cheng
2015, 39(5): 056001. doi: 10.1088/1674-1137/39/5/056001
Abstract:
We have developed a large area multi-wire proportional counter (MWPC) as a standard for the measurement of alpha and beta surface emission rate at the Shanghai Institute of Measurement and Testing Technology (SIMT). To shorten the preparation time fo...
Experimental research on a THGEM-based thermal neutron detector
YANG Lei, ZHOU Jian-Rong, SUN Zhi-Jia, ZHANG Ying, HUANG Chao-Qiang, SUN Guang-Ai, WANG Yan-Feng, YANG Gui-An, XU Hong, XIE Yu-Guang, CHEN Yuan-Bo
2015, 39(5): 056002. doi: 10.1088/1674-1137/39/5/056002
Abstract:
A new thermal neutron detector with a domestically produced THGEM (Thick Gas Electron Multiplier) was developed as an alternative to 3He to meet the needs of the next generation of neutron facilities. One type of Au-coated THGEM was designed specific...
A cosmic ray test platform based on high time resolution MRPC technology
CHEN Tian-Xiang, LI Cheng, SUN Yong-Jie, CHEN Hong-Fang, SHAO Ming, TANG Ze-Bo, YANG Rong-Xing, ZHOU Yi, ZHANG Yi-Fei
2015, 39(5): 056003. doi: 10.1088/1674-1137/39/5/056003
Abstract:
In order to test the performance of detector prototypes in a laboratory environment, we design and build a large area (90 cm×52 cm) test platform for cosmic rays based on a well-designed Multi-gap Resistive Plate Chamber (MRPC) with excellent time re...
Application of the DRS4 chip for GHz waveform digitizing circuits
YANG Hai-Bo, SU Hong, KONG Jie, CHENG Ke, CHEN Jin-Da, DU Cheng-Ming, ZHANG Jing-Zhe
2015, 39(5): 056101. doi: 10.1088/1674-1137/39/5/056101
Abstract:
A new fast waveform sampling digitizing circuit based on the domino ring sampler (DRS), a switched capacitor array (SCA) chip, is presented in this paper, which is different from the traditional waveform digitizing circuit constructed with an analog ...
A precise calculation of delayed coincidence selection efficiency and accidental coincidence rate
YU Jing-Yi, WANG Zhe, CHEN Shao-Min
2015, 39(5): 056201. doi: 10.1088/1674-1137/39/5/056201
Abstract:
A precise background evaluation model is proposed to address the complex data structure of the delayed coincidence method, which is widely used in reactor electron-antineutrino oscillation experiments. In this model, effects from the muon veto, uncor...
Accelerator
Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats
HUANG Xi-Yang, JIAO Yi, XU Gang, CUI Xiao-Hao
2015, 39(5): 057001. doi: 10.1088/1674-1137/39/5/057001
Abstract:
The coherent synchrotron radiation (CSR) effect in a bending path plays an important role in transverse emittance dilution in high-brightness light sources and linear colliders, where the electron beams are of short bunch length and high peak current...
Effect of the transverse parasitic mode on beam performance for the ADS driver linac in China
CHENG Peng, PEI Shi-Lun, WANG Jiu-Qing, LI Zhi-Hui
2015, 39(5): 057002. doi: 10.1088/1674-1137/39/5/057002
Abstract:
The ADS (Accelerator Driven subcritical System) driver linac in China is designed to run in CW (Continuous Wave) mode with 10 mA designed beam current. In this scenario, the beam-induced parasitic modes in the ADS driver linac may make the beam unsta...
Ion behavior and interelectrode breakdown voltage of a drift tube
GENG Hao, ZHAO Zhong-Jun, DUAN Yi-Xiang
2015, 39(5): 057003. doi: 10.1088/1674-1137/39/5/057003
Abstract:
We experimentally studied ion behavior and interelectrode breakdown voltage. The ion behavior of a drift tube directly influences the detection of ion intensity, and then influences the detection sensitivity of a system. Interelectrode voltage and pr...
Design of an asymmetric superconducting magnet for a Penning trap
BIAN Wen-Long, MA Li-Zhen, WU Wei, YAO Qing-Gao, GUAN Ming-Zhi, DU Jun-Jie
2015, 39(5): 057004. doi: 10.1088/1674-1137/39/5/057004
Abstract:
A new 7.0 T asymmetric active shield superconducting magnet for Penning traps is proposed in this work. The magnet has two field regions whose homogeneity is better than 0.5 ppm. Linear and nonlinear methods are used for the asymmetric electromagneti...
RF study of a C-band barrel open cavity pulse compressor
SHU Guan, ZHAO Feng-Li, HE Xiang
2015, 39(5): 057005. doi: 10.1088/1674-1137/39/5/057005
Abstract:
This paper focuses on the RF study of a C-band barrel open cavity (BOC) pulse compressor. The operating principle of BOC is presented and the technical specifications are determined. The main parts of BOC such as the cavity, the matching waveguide, t...
Accelerating structure design and fabrication for KIPT and PAL XFEL
HOU Mi, HE Xiang, PEI Shi-Lun, NA Bin, CHI Yun-Long
2015, 39(5): 057006. doi: 10.1088/1674-1137/39/5/057006
Abstract:
ANL (Argonne National Laboratory) and the National Science Center “Kharkov Institute of Physics Technology” (NSC KIPT, Kharkov, Ukraine) jointly propose to design and build a 100 MeV/100 kW linear accelerator which will be used to drive the neutron s...
Development of a high-power and ultra-high-vacuum waveguide coupler working at C/X band
HE Xiang, ZHAO Feng-Li, WANG Xiang-Jian
2015, 39(5): 057007. doi: 10.1088/1674-1137/39/5/057007
Abstract:
Waveguide directional couplers working at 5.712/11.9924 GHz are developed. Even holes symmetrical to the structure are drilled along the central line of the narrow-wall of the waveguide, which are used to couple the electromagnetic power from the mai...
Status of CSNS H- ion source
LIU Sheng-Jin, HUANG Tao, OUYANG Hua-Fu, ZHAO Fu-Xiang, XIAO Yong-Chuan, CAO Xiu-Xia, XUE Kang-Jia, ZHANG Jun-Song, XU Tao-Guang, LI Fang, LU Yan-Hua, LI Gang, YANG Lei, LI Yi
2015, 39(5): 057008. doi: 10.1088/1674-1137/39/5/057008
Abstract:
A new H- ion source has been installed successfully and will be used to serve the China Spallation Neutron Source (CSNS). In this paper, we report various components of the ion source, including the discharge chamber, temperature, cooling system, ext...
Adjusting the accelerating field distribution of a superconducting CH cavity
XU Meng-Xin, HE Yuan, ZHANG Sheng-Hu, XIA Jia-Wen
2015, 39(5): 057009. doi: 10.1088/1674-1137/39/5/057009
Abstract:
In a superconducting CH (cross bar H mode) cavity, the method of regulating the length of a drift tube is employed to adjust the distribution of the accelerating field. In this article, we simulate the electromagnetic field of a CH structure to illus...

ISSN 1674-1137 CN 11-5641/O4

Original research articles, Ietters and reviews Covering theory and experiments in the fieids of

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