2015 Vol. 39, No. 7

Is d* a candidate for a hexaquark-dominated exotic state?
HUANG Fei, ZHANG Zong-Ye, SHEN Peng-Nian, WANG Wen-Ling
2015, 39(7): 071001. doi: 10.1088/1674-1137/39/7/071001
We confirm our previous prediction of a d* state with I(JP)=0(3+) [Phys. Rev. C 60, 045203 (1999)] and report for the first time based on a microscopic calculation that d* has about 2/3 hidden color (CC) configurations and thus is a hexaquark-dominated exotic state. By performing a more elaborate dynamical coupled-channels investigation of the ΔΔ-CC system within the framework of the resonating group method (RGM) in a chiral quark model, we find that the d* state has a mass of about 2.38--2.42 GeV, a root-mean-square radius (RMS) of 0.76--0.88 fm, and a CC fraction of 66%--68%. The last may cause a rather narrow width for the d* which, together with the quantum numbers and our calculated mass, is consistent with the newly observed resonance-like structure (M≈ 2380 MeV, Γ≈ 70 MeV) in double-pionic fusion reactions reported by the WASA-at-COSY Collaboration.
Effect of the jet production on pseudorapidity, transverse momentum and transverse mass distributions of charged particles produced in pp-collisions at Tevatron energy
Ali Zaman, Mais Suleymanov, Muhammad Ajaz, Kamal Hussain Khan
2015, 39(7): 073001. doi: 10.1088/1674-1137/39/7/073001
We investigate the effects of jet production on the following parameters: pseudorapidity, transverse momentum and transverse mass distributions of secondary charged particles produced in pp-collisions at 1.8 TeV, using the HIJING code. These distributions are analyzed for the whole range and for six selected regions of the polar angle as a function of the different number of jets. The obtained simulation results for these parameters are interpreted and discussed in connection to the increase observed in the multiplicity of secondary charged particles as a result of its multi-jet dependence, and are also discussed in comparison with the experimental results from the CDF Collaboration.
Top quark decay to a 125 GeV Higgs in the BLMSSM
GAO Tie-Jun, FENG Tai-Fu, SUN Fei, ZHANG Hai-Bin, ZHAO Shu-Min
2015, 39(7): 073101. doi: 10.1088/1674-1137/39/7/073101
In this paper, we calculate the rare top quark decay t → ch in a supersymmetric extension of the Standard Model where baryon and lepton numbers are local gauge symmetries. Adopting reasonable assumptions on the parameter space, we nd that the branching ratios of t→ch can reach 10-3, which could be detected in the near future.
Study of fusion Q-value rule in sub-barrier fusion of heavy ions
LIU Xing-Xing, ZHANG Gao-Long, ZHANG Huan-Qiao
2015, 39(7): 074101. doi: 10.1088/1674-1137/39/7/074101
A vast body of fusion data has been analyzed for different projectiles and target nuclei. It is indicated that the sub-barrier fusion depends on the fusion Q-value. In terms of a recently introduced fusion Q-value rule and an energy scaling reduction procedure, the experimental fusion excitation functions are reduced and compared with each other. It is found that the reduced fusion excitations of selected fusion systems show a similar trend. The fusion data for massive nuclei are in agreement with the Q-value rule. In the fusion process, the Q contribution should be considered. Within this approach, the sub-barrier fusion cross sections of most fusion systems can be predicted without involving any structure effects of colliding nuclei. Instances of disagreement are presented in a few fusion systems. The use of the energy scaling as a criterion of possible experimental data inconsistency is discussed. More precise experimental fusion data need to be measured.
Description of the evolution of mixed-symmetry states in the N=78 isotonic chain with IBM2
ZHANG Da-Li, YUAN Shu-Qing, DING Bin-Gang
2015, 39(7): 074102. doi: 10.1088/1674-1137/39/7/074102
The characteristics of the lowest mixed-symmetry states 2ms+ and 1ms+ for 132Xe, 134Ba and 136Ce in the even-even N=78 isotones are investigated within the framework of the IBM2 model. The lowest mixed-symmetry state 2ms+ levels for both a single isolated state in 132Xe and 136Ce and a fragmented state in 134Ba are reproduced by the predictions. The agreement between the IBM2 calculation and the experimental values is good for the B(E2) and B(M1) transition probabilities both quantitatively and qualitatively. The predicted summed B(M1) strength follows the experimental data, remaining nearly constant as a function of proton number along the chain of the N=78 isotones.
Relationship between quark-antiquark potential andquark-antiquark free energy in hadronic matter
SHEN Zhen-Yu, XU Xiao-Ming
2015, 39(7): 074103. doi: 10.1088/1674-1137/39/7/074103
In high-temperature quark-gluon plasma and its subsequent hadronic matter created in a high-energy nucleus-nucleus collision, the quark-antiquark potential depends on the temperature. The temperature-dependent potential is expected to be derived from the free energy obtained in lattice gauge theory calculations. This requires one to study the relationship between the quark-antiquark potential and the quark-antiquark free energy. When the system's temperature is above the critical temperature, the potential of a heavy quark and a heavy antiquark almost equals the free energy, but the potential of a light quark and a light antiquark, of a heavy quark and a light antiquark and of a light quark and a heavy antiquark is substantially larger than the free energy. When the system's temperature is below the critical temperature, the quark-antiquark free energy can be taken as the quark-antiquark potential. This allows one to apply the quark-antiquark free energy to study hadron properties and hadron-hadron reactions in hadronic matter.
Detection Technology , Electronics and Methods
Simulation of the response functions of an extended rangeneutron multisphere spectrometer using FLUKA
WANG Pan-Feng, DING Ya-Dong, WANG Qing-Bin, MA Zhong-Jian, GUO Si-Ming, LI Guan-Jia
2015, 39(7): 076001. doi: 10.1088/1674-1137/39/7/076001
In this paper, the distribution of radiation field in the CSNS spectrometer hall at Dongguan, China, was simulated by the FLUKA program. The results show that the radiation field of the high energy proton accelerator is dominated by neutron radiation, with a broad range of neutron energies, spanning about eleven orders of magnitude. Simulation and calculation of the response functions of four Bonner spheres with a simplified model is done with FLUKA and MCNPX codes respectively, proving the feasibility of the FLUKA program for this application and the correctness of the calculation method. Using the actual model, we simulate and calculate the energy response functions of Bonner sphere detectors with polyethylene layers of different diameters, including detectors with lead layers, using the FLUKA code. Based on the simulation results, we select eleven detectors as the basic structure for an Extended Range Neutron Multisphere Spectrometer (ERNMS).
Ground-based verification and data processing of Yutu roverActive Particle-induced X-ray Spectrometer
GUO Dong-Ya, WANG Huan-Yu, PENG Wen-Xi, CUI Xing-Zhu, ZHANG Cheng-Mo, LIU Ya-Qing, LIANG Xiao-Hua, DONG Yi-Fan, WANG Jin-Zhou, GAO Min, YANG Jia-Wei, ZHANG Jia-Yu, LI Chun-Lai, ZOU Yong-Liao, ZHANG Guang-Liang, ZHANG Li-Yan, FU Xiao-Hui
2015, 39(7): 076002. doi: 10.1088/1674-1137/39/7/076002
The Active Particle-induced X-ray Spectrometer (APXS) is one of the payloads on board the Yutu rover of the Chang'E-3 mission. In order to assess the instrumental performance of APXS, a ground verification test was performed for two unknown samples (basaltic rock, mixed powder sample). In this paper, the details of the experiment configurations and data analysis method are presented. The results show that the elemental abundance of major elements can be well determined by the APXS with relative deviations <15 wt.% (detection distance=30 mm, acquisition time=30 min). The derived detection limit of each major element is inversely proportional to acquisition time and directly proportional to detection distance, suggesting that the appropriate distance should be <50 mm.
A digital CDS technique and its performance testing
LIU Xiao-Yan, LU Jing-Bin, YANG Yan-Ji, LU Bo, WANG Yu-Sa, XU Yu-Peng, CUI Wei-Wei, LI Wei, LI Mao-Shun, WANG Juan, HAN Da-Wei, CHEN Tian-Xiang, HUO Jia, HU Wei, ZHANG Yi, ZHU Yue, ZHANG Zi-Liang, YIN Guo-He, WANG Yu, ZHAO Zhong-Yi, FU Yan-Hong, ZHANG Ya, MA Ke-Yan, CHEN Yong
2015, 39(7): 076101. doi: 10.1088/1674-1137/39/7/076101
Readout noise is a critical parameter for characterizing the performance of charge-coupled devices (CCDs), which can be greatly reduced by the correlated double sampling (CDS) circuit. However, a conventional CDS circuit inevitably introduces new noise since it consists of several active analog components such as operational amplifiers. This paper proposes a digital CDS circuit technique, which transforms the pre-amplified CCD signal into a train of digital presentations by a high-speed data acquisition card directly without the noisy CDS circuit, then implements the digital CDS algorithm through a numerical method. A readout noise of 3.3 e- and an energy resolution of 121 eV@5.9 keV can be achieved via the digital CDS technique.
A data readout approach for physics experiments
HUANG Xi-Ru, CAO Ping, GAO Li-Wei, ZHENG Jia-Jun
2015, 39(7): 076102. doi: 10.1088/1674-1137/39/7/076102
With increasing physical event rates and the number of electronic channels, traditional readout schemes meet the challenge of improving readout speed caused by the limited bandwidth of the crate backplane. In this paper, a high-speed data readout method based on the Ethernet is presented to make each readout module capable of transmitting data to the DAQ. Features of explicitly parallel data transmitting and distributed network architecture give the readout system the advantage of adapting varying requirements of particle physics experiments. Furthermore, to guarantee the readout performance and flexibility, a standalone embedded CPU system is utilized for network protocol stack processing. To receive the customized data format and protocol from front-end electronics, a field programmable gate array (FPGA) is used for logic reconfiguration. To optimize the interface and to improve the data throughput between CPU and FPGA, a sophisticated method based on SRAM is presented in this paper. For the purpose of evaluating this high-speed readout method, a simplified readout module is designed and implemented. Test results show that this module can support up to 70 Mbps data throughput from the readout module to DAQ.
Study of an unfolding algorithm for D-T neutron energy spectra measurement using a recoil proton method
WANG Jie, LU Xiao-Long, YAN Yan, WEI Zheng, WANG Jun-Run, RAN Jian-Ling, HUANG Zhi-Wu, LAN Chang-Lin, YAO Ze-En, SHEN Fei, LIANG Tian-Jiao
2015, 39(7): 076201. doi: 10.1088/1674-1137/39/7/076201
A proton recoil method for measuring D-T neutron energy spectra using polyethylene film and a Si(Au) surface barrier detector is presented. An iteration algorithm for unfolding the recoil proton energy spectrum to the neutron energy spectrum is investigated. The response matrices R of the polyethylene film at angles of 0° and 45° were obtained by simulating the recoil proton energy spectra from mono-energetic neutrons using the MCNPX code. With an assumed D-T neutron spectrum, the recoil proton spectra from the polyethylene film at angles of 0° and 45° were also simulated using the MCNPX code. Based on the response matrices R and the simulated recoil proton spectra at 0° and 45°, the respective unfolded neutron spectra were obtained using the iteration algorithm, and compared with the assumed neutron spectrum. The results show that the iteration algorithm method can be applied to unfold the recoil proton energy spectrum to the neutron energy spectrum for D-T neutron energy spectra measurement using the recoil proton method.
Radiation and ionization energy loss simulation for the GDHsum rule experiment in Hall-A at Jefferson Lab
YAN Xin-Hu, YE Yun-Xiu, CHEN Jian-Ping, ZHU Peng-Jia, JIANG Feng-Jian
2015, 39(7): 076202. doi: 10.1088/1674-1137/39/7/076202
The radiation and ionization energy loss are presented for single arm Monte Carlo simulation for the GDH sum rule experiment in Hall-A at the Jefferson Lab. Radiation and ionization energy loss are discussed for 12C elastic scattering simulation. The relative momentum ratio Δp/p and 12C elastic cross section are compared without and with radiative energy loss and a reasonable shape is obtained by the simulation. The total energy loss distribution is obtained, showing a Landau shape for 12C elastic scattering. This simulation work will give good support for radiation correction analysis of the GDH sum rule experiment.
A multi-length bunch design for electron storage ringswith odd buckets
HU Liang-Jing, LI Wei-Min, WANG Lin, XIANG Dao, HUANG Xiao-Biao
2015, 39(7): 077001. doi: 10.1088/1674-1137/39/7/077001
A scheme with two superconducting RF cavities is designed to upgrade electron storage rings with odd buckets to multi-length bunches. In this paper, the Hefei Light Source Ⅱ (HLS Ⅱ) is given as an example for odd buckets. As it is designed for 45 buckets, which is a multiple of 3, simultaneous generation of three different lengths of bunches is proposed with the presently applied user optics. The final result, without low-α optics, is to fill HLS Ⅱ with long bunches of length 50 ps, medium bunches of 23 ps and short bunches of 6 ps. Every third bucket can be filled with short bunches, of which the current limit is up to 6.6 mA, more than 60 times the limit for low-α mode. Moreover, particle tracking simulations to examine the beam dynamics, performed by ELEGANT, and calculations of the beam instabilities are presented in this paper.
Effect of undulators on the stored electron beam of Indus-2
Abdurrahim, A. D. Ghodke
2015, 39(7): 077002. doi: 10.1088/1674-1137/39/7/077002
Indus-2 is an Indian synchrotron light source, operating at 2.5 GeV and generating synchrotron radiation from its bending magnets. In order to provide more intense synchrotron radiation to the synchrotron users, there is a plan to install five insertion devices in the Indus-2 storage ring. In the first phase of installation of insertion devices, there is a proposal to install two out- vacuum pure permanent magnet linearly polarized undulators in long straight sections of the Indus-2 storage ring. The presence of the insertion devices in the ring has inevitable effects on beam parameters like betatron tune, betatron amplitude function, closed orbit, emittance, energy spread and dynamic aperture etc. In this paper, the effect of two undulators on the above mentioned parameters of the Indus-2 stored electron beam at 2.5 GeV is presented. Moreover a correction scheme for the restoration of the betatron tune and amplitude function is also presented.
Producing terahertz coherent synchrotron radiation atthe Hefei Light Source
XU De-Rong, XU Hong-Liang, SHAO Yan
2015, 39(7): 077003. doi: 10.1088/1674-1137/39/7/077003
This paper theoretically proves that an electron storage ring can generate coherent radiation in the THz region using a quick kicker magnet and an AC sextupole magnet. When the vertical chromaticity is modulated by the AC sextupole magnet, the vertical beam collective motion excited by the kicker produces a wavy spatial structure after a number of longitudinal oscillation periods. The radiation spectral distribution was calculated from the wavy bunch parameters at the Hefei Light Source (HLS). When the electron energy is reduced to 400 MeV, extremely strong coherent synchrotron radiation (CSR) at 0.115 THz should be produced.
Particle acceleration by stimulated emission of radiationin cylindrical waveguide
TIAN Xiu-Fang, WU Cong-Feng, JIA Qi-Ka
2015, 39(7): 077004. doi: 10.1088/1674-1137/39/7/077004
In particle acceleration by stimulated emission of radiation (PASER), efficient interaction occurs when a train of micro-bunches has periodicity identical to the resonance frequency of the medium. Previous theoretical calculations based on the simplified model have only considered the energy exchange in the boundless condition. Under experimental conditions, however, the gas active medium must be guided by the metal waveguide. In this paper, we have developed a model of the energy exchange between a train of micro-bunches and a gas mixture active medium in a waveguide boundary for the first time, based on the theory of electromagnetic fields, and made detailed analysis and calculations with MathCAD. The results show that energy density can be optimized to a certain value to get the maximum energy exchange.
Design of a C-band relativistic extended interaction klystronwith coaxial output cavity
WU Yang, ZHAO De-Kui, CHEN Yong-Dong
2015, 39(7): 077005. doi: 10.1088/1674-1137/39/7/077005
In order to overcome the disadvantages of conventional high frequency relativistic klystron amplifiers in power capability and RF conversion efficiency, a C-band relativistic extended interaction klystron amplifier with coaxial output cavity is designed with the aid of PIC code MAGIC. In the device, disk-loaded cavities are introduced in the input and intermediate cavity to increase the beam modulation depth, and a coaxial disk-loaded cavity is employed in the output cavity to enhance the RF conversion efficiency. In PIC simulation, when the beam voltage is 680 kV and current is 4 kA, the device can generate 1.11 GW output power at 5.64 GHz with an efficiency of 40.8%.
Synchrotron radiation,applications of nuclear techniquees,etc
Monte Carlo simulation and parameterized treatment on the effect of nuclear elastic scattering in high-energy proton radiography
2015, 39(7): 078201. doi: 10.1088/1674-1137/39/7/078201
A version of Geant4 has been developed to treat high-energy proton radiography. This article presents the results of calculations simulating the effects of nuclear elastic scattering for various test step wedges. Comparisons with experimental data are also presented. The traditional expressions of the transmission should be correct if the angle distribution of the scattering is Gaussian multiple Coulomb scattering. The mean free path (which depends on the collimator angle) and the radiation length are treated as empirical parameters, according to transmission as a function of thickness obtained by simulations. The results can be used in density reconstruction, which depends on the transmission expressions.
Performance assessment of CsI(Tl) screens on varioussubstrates for X-ray imaging
FENG Zhao-Dong, JIANG Peng, ZHANG Hong-Kai, ZHAO Bo-Zhen, QIN Xiu-Bo, WEI Cun-Feng, LIU Yu, WEI Long
2015, 39(7): 078202. doi: 10.1088/1674-1137/39/7/078202
Thallium-doped cesium iodide (CsI(Tl)) screens are widely used in X-ray imaging devices because of the columnar structure of the CsI(Tl) layer, but few reports focus on the optical role of the substrate in the screen system. In this paper, four substrates including fused silica (SiO2), silver-film coated SiO2, graphite (C) and fiber optic plate (FOP) are used to fabricate CsI(Tl) screens by thermal evaporation. Their imaging performance is evaluated by relative light output (RLO), modulation transfer function (MTF), normalized noise power spectrum (NNPS) and noise equivalent quanta (NEQ). The results reveal that although CsI(Tl) film on graphite plate yields images with the lowest light output, it presents relatively higher spatial resolution and better signal-to-noise characteristics. However, films on SiO2 plate obtain low MTF but high NNPS curves, whether they are coated with silver film or not. Furthermore, scintillation screens on FOP have bright images with low NNPS and high NEQ, but have the lowest MTF. By controlling the substrate optical features, CsI(Tl) films can be tailored to suit a given application.
Specific absorbed fractions of electrons and photons forRad-HUMAN phantom using Monte Carlo method
WANG Wen, CHENG Meng-Yun, LONG Peng-Cheng, HU Li-Qin
2015, 39(7): 078203. doi: 10.1088/1674-1137/39/7/078203
The specific absorbed fractions (SAF) for self- and cross-irradiation are effective tools for the internal dose estimation of inhalation and ingestion intakes of radionuclides. A set of SAFs of photons and electrons were calculated using the Rad-HUMAN phantom, which is a computational voxel phantom of a Chinese adult female that was created using the color photographic image of the Chinese Visible Human (CVH) data set by the FDS Team. The model can represent most Chinese adult female anatomical characteristics and can be taken as an individual phantom to investigate the difference of internal dose with Caucasians. In this study, the emission of mono-energetic photons and electrons of 10 keV to 4 MeV energy were calculated using the Monte Carlo particle transport calculation code MCNP. Results were compared with the values from ICRP reference and ORNL models. The results showed that SAF from the Rad-HUMAN have similar trends but are larger than those from the other two models. The differences were due to the racial and anatomical differences in organ mass and inter-organ distance. The SAFs based on the Rad-HUMAN phantom provide an accurate and reliable data for internal radiation dose calculations for Chinese females.