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Chinese Physics C 2017年第4期41卷 50-55页

作者：张苏雅拉吐黄美容 r.wada 刘星泉林炜平王建松 College of Physics and Electronics Information Inner Mongolia University for Nationalities Cyclotron Institute Texas A&M UniversityCollege Station Institute of Modern Physics Chinese Academy of Sciences

An attempt is made to study the symmetry energy at the time of primary fragment formation from the experimentally observed cold fragments for a neutron-rich system of ^64Ni ＋ ^9Be at 140 MeV/nucleon,utilizing the recent finding that the excitation energy becomes lower for more neutron-rich isotopes with a given Z *** extracted α（sym）/T values from the cold fragments,based on the Modified Fisher Model（MFM）,are compared to those from the primary fragments of the antisymmetrized molecular dynamics（AMD） simulation and become consistent with the simulation when the I = N —Z value becomes larger,indicating that the excitation energy of these neutron-rich isotopes is indeed lower.

关键词： symmetry energy modified Fisher model antisymmetrized molecular dynamics simulations

Effects of In-Medium Nucleon-Nucleon Cross Section and Nuclear Density Distribution on the Proton-Nucleus Total reaction Cross Section

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Chinese Physics Letters 2013年第12期30卷 25-29页

作者： HAN rui CHEN Zhi-Qiang r.wada ZHANG Su-Ya-La-Tu LIU Xing-Quan LIN Wei-Ping JIN Zeng-Xue HU Bi-Tao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000 University of Chinese Academy of Sciences Beijing 100049

We present the proton-total reaction cross sectionsσr by comparing the experimental data with the Glauber model calculation using four sets of nucleon-nucleon cross sections used in literature(free nucleon-nucleon cross sections(NNCS),phenomenological NNCS,Bruckner-type NNCS and Pauli NNCS)and different nuclear densities for symmetric and asymmetric *** light symmetric target nuclei,the experimentalσr data are well reproduced by the former three NNCS with the ground state density distributions of relativistic mean-field *** the other hand,for asymmetry heavier target nuclei,the calculations of theσr data depend significantly on the nuclear density distribution at large radius in the low energy *** experimentalσr of these nuclei are well reproduced by the empirical 3 pF density distribution and the in-medium *** neutron surface distributions are also discussed based on the 3 pF nuclear charge distributions.

关键词： theory symmetric radius

Determining the nuclear temperature dependence on source neutron-proton asymmetry in heavy-ion reactions at intermediate energy

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Chinese Physics C 2023年第5期47卷 152-159页

作者：曲国峰黄宇郑华刘星泉 r.wada 林炜平黄美容韩纪锋任培培杨振雷张鑫冷强钟 Key Laboratory of radiation Physics and Technology of the Ministry of Education Sichuan UniversityChengdu 610064China Institute of Nuclear Science and Technology Sichuan UniversityChengdu 610064China School of Physics and Information Technology Shaanxi Normal UniversityXi'an 710119China Cyclotron Institute Texas A&M UniversityCollege StationTexas 77843USA College of Physics and Electronics information Inner Mongolia University for NationalitiesTongliao 028000China Science and Technology on reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

In this article,we investigate the dependence of nuclear temperature on emitting source neutron-proton(N/Z)asymmetry with light charged particles(LCPs)and intermediate mass fragments(IMFs)generated from intermediate-velocity sources in thirteen reaction systems with different N/Z asymmetries,^(64)Zn on^(112)Sn,and^(70)Zn,^(64)Ni on^(112,124)Sn,^(58,64)Ni,^(197)Au,and^(232)Th at 40 MeV/*** apparent temperature values of LCPs and IMFs from different systems are deduced from the measured yields using two helium-related and eight carbon-related double isotope ratio thermometers,***,the sequential decay effect on the experimental apparent temperature deduction with the double isotope ratio thermometers is quantitatively corrected explicitly with the aid of the quantum statistical *** present treatment is an improvement compared to our previous studies in which an indirect method was adopted to qualitatively consider the sequential decay effect.A negligible N/Z asymmetry dependence of the real temperature after the correction is quantitatively addressed in heavy-ion reactions at the present intermediate energy,where a change of o.1 units in source N/Z asymmetry corresponds to an absolute change in temperature of an order of 0.03 to 0.29 MeV on average for LCPs and *** conclusion is in close agreement with that inferred qualitatively via the indirect method in our previous studies.

关键词： nuclear temperature N/Z asymmetry dependence Albergo thermometer sequential decay correction heavy-ion reactions at intermediate energy

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Study on gamma response function of EJ301 organic liquid scintillator with GEANT4 and FLUKA

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Chinese Physics C 2013年第12期37卷 65-70页

作者：张苏雅拉吐陈志强韩瑞刘星泉 r.wada 林炜平靳增雪席印印刘建立石福东 Institute of Modern Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Lanzhou University Cyclotron Institute Texas A&M University College Station College of Nuclear Science and Technology Harbin Engineering University

The gamma response function is required for energy calibration of EJ301 （5 cm in diameter and 20 cm in height） organic liquid scintillator detector by means of gamma sources. The GEANT4 and FLUKA Monte Carlo simulation packages were used to simulate the response function of the detector for standard 22Na, 60Co, 137Cs gamma sources. The simulated results showed a good agreement with experimental data by incorporating the energy resolution function to simulation codes. The energy resolution and the position of the maximum Compton electron energy were obtained by comparing measured light output distribution with simulated one. The energy resolution of the detector varied from 21.2% to 12.4% for electrons in the energy region from 0.341 MeV to 1.12 MeV. The accurate position of the maximum Compton electron energy was determined at the position 81% of maximum height of Compton edges distribution. In addition, the relation of the electron energy calibration and the effective neutron detection thresholds were described in detail. The present results indicated that both packages were suited for studying the gamma response function of EJ301 detector.

关键词： gamma response function E J301 organic liquid scintillator energy calibration energy resolutionfunction GEANT4 FLUKA Compton edge

Projectile Fragmentation in ^(20)Ne-^(165)Ho reaction at 45 MeV/u

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Chinese journal of nuclear physics 1995年第3期17卷 228-233页

作者： G.X.Dai J.B.Natowitz r.wada K.Hagel Q.Z.Luo Z.Y.He J.Blackadar S.Lee J.T.Li Y.N.Lou D.Utley B.Xiao Institute of Modern Physics Chinese Academy of SciencesP.O.Box 31Lanzhou 7300002 Cylotron Institute and Physics DepartmentTexas A & M UniversityCollege StationTexas 77843 Cylotron Institute and Physics Department Texas A & M UniversityCollege StationTexas 77843 Institute of Modern Physics Chinese Academy of SciencesP.O.Box 31Lanzhou 7300002

At 45 MeV/u an experiment on fragmentation of projectile(20Ne)on 165Ho was *** average reduced width σ0 of 84.3±6.6 MeV/c was obtained by separating the break=up of all com-plex fragments of 20Ne from the evaporatio... 详细信息

关键词： Projectile fragmentation reduced width of Fermi momentum 20Ne+165Ho reaction

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液体闪烁探测器中子的探测效率模拟(英文)

IMP & HIrFL Annual report 2012年 235-236页

作者：林炜平 Liu Xingquan Zhang Suyalatu Huang Meirong Liu Jianli Shi Fudong Han rui Jin Zengxue ren Peipei Jia Baolu Chen Zhiqiang r.wada

In a field mixed of neutron(n)andγrays,one of the most widely used detectors for neutron spectroscopic studies is the organic liquid scintillator(EJ301,BC501A,NE213).Nevertheless,the efficiency calibration of liquid ...

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CsI(Tl)探测器性能测试(英文)

IMP & HIrFL Annual report 2012年 236-237页

作者：靳曾雪 Lin Weiping Liu Xingquan Zhang Suyalatu Huang Meirong Liu Jianli Shi Fudong Han rui Jin Zengxue ren Peipei Jia Baolu Chen Zhiqiang r.wada

Spallation reaction produced numerous light charged *** charged particles were detected by using light charged particle flight time spectrometer,which is a complete set of system from different angle dE-Etelescope system structure and a beam *** energy loss dEof charged particles was measured by aplastic scintillator *** total energy Eof charged particles was measured by stop-

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初始碎片重构(英文)

IMP & HIrFL Annual report 2012年第0期 66-67页

作者：林炜平 Liu Xingquan Zhang Suyalatu Huang Meirong Liu Jianli Shi Fudong Han rui Jin Zengxue ren Peipei Jia Baolu Zhao Minghui Chen Zhiqiang r.wada

In order to reconstruct the primary fragment distribution experimentally,a fragment-particle correlation technique based upona kinematical focusing method was used to detecting the light particles(LPs)associated with intermediate mass trigger fragments(IMFs).The experiment was performed at the K-500superconducting cyclotron facility at Texas A&M University.64,70Zn and 64 Ni beams were used to irradiate58,64 Ni,112,124Sn,197 Au,and 232 Th targets at 40 *** detector setup is same asthat in references[1-7].

关键词：

reaction Plane Determination for ^(64)Zn+^(27)Al Collisions at Intermediate Energy

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Chinese journal of nuclear physics 1994年第3期 207-210页

作者： A.Buta J.C.Angelique G.Bizard r.Brou D.Cussol A.Kerambrun J.P.Patry J.Peter r.POpescu r.regimbart J.C.Steckmeyer B.Tamain E.Vient G.Auger C.Cabot E.Crema A.Peghaire F.Saint-Laurent M.Gonin K.Hagel r.wada P.Eudes C.Lebrun E.rosato Y.El Masri LPC Caen ISMRAIN2P3-CNRSF-14050 CaenFrance IFAHeavy Ion DepartmentBucharestRomania. LPC Caen ISMRAIN2P3-CNRSF-14050 CaenFrance GANIL BP5027F-14021 CaenFrance Cyclotron Institute Texas A & M UniversityCollege StationTX77843USA LPN Universite de Nantes44072 Nantes Cedex 03France Dipartimento di Scienze Fisiche Universita di Napoli1-80125 NaplesItaly UCL Louvain-la-NeuveBelgium

The collective flow for 64Zn+27Al system is measured at intermediate energyby using a 4π multidetector array in conjunction with an array of Si *** have been sorted versus the impact parameter by means of global *** methods of reaction plane determination are compared:sphericity tensor method,transverse momentum analysis,and azimuthal correlation *** this system,thetransverse momentum analysis method is the best one.

关键词： Collective flow reaction plane Transverse momentum analysis Azimuthal correlation