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Simulation of ^(12)C+^(12)C elastic scattering at high energy by using the Monte Carlo method

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Chinese Physics C 2012年第3期36卷 205-209页

作者：郭晨雷张高龙 i.tanihata 乐小云 School of Physics and Nuclear Energy Engineering Beihang University State Key Laboratory of Software Development Environment Beihang University Research Center for Nuclear Physics Osaka University

The Monte Carlo method is used to simulate the 12C＋12C reaction process. Taking into account the size of the incident 12C beam spot and the thickness of the 12C target, the distributions of scattered 12C on the MWPC and the Csi detectors at a detective distance have been simulated. in order to separate elastic scattering from the inelastic scattering with 4.4 MeV excited energy, we set several variables： the kinetic energy of incident 12C, the thickness of the 12C target, the ratio of the excited state, the wire spacing of the MWPC, the energy resolution of the Csi detector and the time resolution of the plastic scintillator. From the simulation results, the preliminary establishment of the experiment system can be determined to be that the beam size of the incident 12C is Ф5 mm, the incident kinetic energy is 200-400 A MeV, the target thickness is 2 mm, the ratio of the excited state is 20%, the flight distance of scattered 12C is 3 m, the energy resolution of the Csi detectors is 1%, the time resolution of the plastic scintillator is 0.5%, and the size of the Csi detectors is 7 cm×7 cm, and we need at least 16 Csi detectors to cover a 0° to 5° angular distribution.

关键词： simulation kinetic energy scattering angle elastic scattering

Toward precision mass measurements of neutron-rich nuclei relevant to r-process nucleosynthesis

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Frontiers of physics 2015年第4期10卷 1-25页

作者： B. H. Sun Yu. A. Litvinov i. tanihata Y. H. Zhang School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China international Research Center for Nuclei and Particles in the Cosmos Beijing 100191 China Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China GSi Helmholtzzentrum fiir Schwerionenforschung Planckstrafle 1 64291 Darmstadt Germany

The open question of where, when, and how the heavy elements beyond iron enrich our Universe has triggered a new era in nuclear physics studies. Of all the relevant nuclear physics inputs, the mass of very neutron-rich nuclides is a key quantity for revealing the origin of heavy elements beyond iron. Although the precise determination of this property is a great challenge, enormous progress has been made in recent decades, and it has contributed significantly to both nuclear structure and astrophysical nucleosynthesis studies. in this review, we first survey our present knowledge of the nuclear mass surface, emphasizing the importance of nuclear mass precision in r-process calculations. We then discuss recent progress in various methods of nuclear mass measurement with a few selected examples. For each method, we focus on recent breakthroughs and discuss possible ways of improving the weighing of r-process nuclides.

关键词： binding energy r-process nucleosynthesis nuclear mass spectrometry

Simulation of 200–400 Me V/u ^(12)C+^(12)C elastic scattering on SHARAQ spectrometer

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Chinese Physics C 2015年第2期39卷 55-59页

作者：于蕾张高龙 S.Terashima i.tanihata 乐小云 School of Physics and Nuclear Energy Engineering Beihang University Research Center for Nuclear Physics Osaka University

in order to further obtain the information of three-body force （TBF） from 200-400 MeV/u ^12C＋^12C elastic scattering, we plan to perform this experiment on a SHARAQ spectrometer. Based on the experimental condition of the Radioactive ion Beam Factory （RiBF）-SHARAQ facility, a simulation is given to find a compromise between the better energy and angular resolutions, and higher yield by optimizing the target thickness, beam transport mode, beam intensity and angular step. From the simulation, we found that the beam quality mainly limits the improvements of energy and angular resolutions. A beam tracking system as well as a lateral and angular dispersion- matching technique axe adopted to reduce the influence of beam quality. According to the two angular settings of SHARAQ as well as the expected cross sections on the basis of the theoretical model, the energy and angular resolutions, and statistical accuracy are estimated.

关键词： elastic scattering three-body force SHARAQ Monte Carlo method

Simulation of beam optics for ^(12)C+^(12)C scattering of RCNP by using Monte Carlo method

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Chinese Physics C 2014年第11期38卷 56-60页

作者：屈卫卫张高龙 i.tanihata S.Terashima 郭晨雷乐小云 H.Sakaguchi School of Physics and Nuclear Energy Engineering Beihang University international Research Center for Nuclei and Particles in the Cosmos Beihang University State Key Laboratory of Software Development Environment Beihang University Research Center for Nuclear Physics Osaka University

The Monte Carlo method is used to simulate the beam optics of the WS beam line of RCNP, Osaka University in order to know the effect of collimators on the beam line to control the beam spot. According to the simulation, we do not need to use the collimator to cut the beam and the beam angular resolution can be better than 0.05° in achromatic mode. in the present paper, the actual beam condition during the beam adjustment is listed. The accelerator can provide a 12C beam in achromatic mode and the angular resolution σ=0.7775 mrad±0.0030 mrad.

关键词： achromatic matching simulation orbit4 datadesk collimators

Reactions for Ri Productions

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Reactions for RI Productions

^(17)C反应截面测量及有限力程Glauber模型分析

CCAST“放射性束核和天体物理”研讨会暨99年亚原子物理暑期讲习班

作者： i.tanihata

Projectile FragmentationTarget Fragmentation, SpallationFusionFission

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高能物理与核物理 2004年第8期28卷 810-813页

作者：吴翠娥 Yamaguchi Y. Ozawa A. tanihata i. 叶沿林北京大学物理学院技术物理系北京100871 The institute of Physical and Chemical Research

用透射法测量了能量为 79AMeV的17C在12 C反应靶上的反应截面 ;利用有限力程Glauber模型对17C的密度分布进行了分析 .由高能区 (96 5AMeV)相互作用截面数据分析认为17C具有谐振子密度分布 ,但拟合本实验结果及高能区实验数据发现 ,17C... 详细信息

用透射法测量了能量为 79AMeV的17C在12 C反应靶上的反应截面 ;利用有限力程Glauber模型对17C的密度分布进行了分析 .由高能区 (96 5AMeV)相互作用截面数据分析认为17C具有谐振子密度分布 ,但拟合本实验结果及高能区实验数据发现 ,17C的中子密度分布中存在一个尾巴 ;假设17C密度为芯核加单粒子密度分布形式 ,分析认为17C的价中子主要处于 1d5/2 轨道 .

关键词：反应截面相互作用截面有限力程Glauber模型密度分布透射法谐振子原子核物理

Recent (D, n) Spin Experiments and Relativistic Nuclear Physics

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Recent (D, n) Spin Experiments and Relativistic Nuclear Phys...

Single-Proton Pickup Reaction of the Halo Nucleus ^6He on a ^9Be Target at 25 MeV/nucleon

CCAST“放射性束核和天体物理”研讨会暨99年亚原子物理暑期讲习班

作者： H. Toki i. tanihata

Ri Beam intensity at the Ri Bcams FactoryPrimary beam of i pua is *** by intensity iiBy Nakamura

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Chinese Physics Letters 2007年第10期24卷 2785-2788页

作者：庞丹阳叶沿林郑涛李智焕李湘庆葛愉成华辉吴翠娥楼建玲卢飞范凤英 A. Ozawa Y. Yamaguchi R. Kanungo D. Fang i.tanihata School of Physics and DOE Key Lab. of Heavy ion Physics Peking University 100871 RiKEN 2-1 Hirosawa Wako Saitama 351-0198 Japan

The inclusive differential cross sections of the ^7 Li nucleus in a reaction induced by ^6He on a ^9Be target are measured at an incident energy of 25 MeV/nucleon. Finite-range distorted-wave Born approximation calculations suggest that these ^7 Li particles are formed in a direct single-proton pickup reaction ^9Be（^6He,^7 Li）^8Li. The experimental data can be well reproduced by taking into account of the contributions of both the ground states and the first excited states of ^7Li and ^8Li.

关键词： coated conductor buffer layer self-epitaxy CeO2

^(17)C反应截面的测量及其密度分布分析

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原子核物理评论 2005年第1期22卷 17-19页

作者：吴翠娥 Yamaguchi Y Ozawa A tanihata i 叶沿林北京大学物理学院技术物理系 The institute of Physical and Chemical Research(RiKEN) Saitama3510198Japan

在日本理化学研究所的放射性束流线上用透射法测量了能量为 79MeV/u的17C在 12C反应靶上的反应截面; 利用有限力程Glauber模型对17C的密度分布进行了分析. 同时拟合本实验结果及高能区的实验数据发现, 17C的中子密度分布中存在一个尾巴.... 详细信息

在日本理化学研究所的放射性束流线上用透射法测量了能量为 79MeV/u的17C在 12C反应靶上的反应截面; 利用有限力程Glauber模型对17C的密度分布进行了分析. 同时拟合本实验结果及高能区的实验数据发现, 17C的中子密度分布中存在一个尾巴. 基于芯核加单粒子密度分布的假设, 认为17C的价中子主要处于 1d5 /2轨道.

关键词：反应截面密度分布 Glauber模型单粒子放射性束流高能透射法中子密度实验结果拟合