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Effects of Neutron Skin Thickness in Peripheral Nuclear Reactions

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Chinese Physics Letters 2011年第10期28卷 66-69页

作者： fang de-qing MA Yu-Gang CAI Xiang-Zhou TIAN Wen-Dong WANG Hong-Wei Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800

Effects of neutron skin thickness in peripheral nuclear collisions are investigated using the statistical abrasion ablation (SAA) model. The reaction cross section, neutron (proton) removal cross section, one-neutron (proton) removal cross section as well as their ratios for nuclei with different neutron skin thickness are studied. It is demonstrated that there are good linear correlations between these observables and the neutron skin thickness for neutron-rich nuclei. The ratio between the (one-)neutron and proton removal cross section is found to be the most sensitive observable of neutron skin thickness. Analysis shows that the relative increase of this ratio could be used to determine the neutron skin size in neutron-rich nuclei.

关键词： observable section Skin

Study of Giant Dipole Resonance of Super Heavy Compound System

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Chinese Physics Letters 1998年第9期15卷 642-644页

作者： CAI Yan-huang WANG Jian-song SHEN Wen-qing MA Yu-gang FENG Jun YE Wei CAI Xiang-zhou fang de-qing CCAST(World Laboratory) P.O.Box 8730Beijing 100080 Institute of Nuclear Research Chinese Academy of ScienceShanghai 201800 Fudan-T.D.Lee Physics Laboratory Fudan UniversityShanghai 200433

A microscopic semi-classical approach,i.e.,the linearized Vlasov equation with a collision term treated by the relaxation time approximation,is simply described and is used to investigate the giant dipole resonance(GDR)from hot super heavy compound *** possibility of such GDRγrays emission is described also according to the fission *** Au+Au system(A=392)and Xe+U system(A=374),the temperature dependence of strength distribution of GDRγrays and the deformation effect on GDRγrays are discussed in framework of this approach.

关键词： system relaxation linearized

Directed and Elliptic Flows in ^(112)Sn+^(112)Sn Collisions

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Chinese Physics Letters 2001年第6期18卷 756-758页

作者： ZHANG Hu-Yong MA Yu-Gang YU Li-Ping SHEN Wen-qing CAI Xiang-Zhou fang de-qing ZHONG Chen HAN Ding-Ding Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 department of Physics Ningbo UniversityNingbo 315211 department of Electronic Engineering East China Normal UniversityShanghai 200062

The directed and elliptic flow in collisions of ^(112)Sn+^(112)Sn at energies from 35 to 90 MeV/nucleon are studied in an isospin-dependent quantum molecule dynamics *** increasing incident energy,the directed flow rises from negative to *** magnitude depends on the nuclear equation of state(EOS).However,the elliptic flow decreases with increasing incident energy and its magnitude is not very sensible to *** studies of the impact parameter dependence and the cluster mass dependence are also *** study of directed flow at intermediate energies thus provides a means of extracting the information on the nuclear equation of state.

关键词： state directed flow

The influence of Multi-Step Sequential decay on Isoscaling and Fragment Isospin Distribution in GEMINI Simulation

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Chinese Physics Letters 2011年第6期28卷 82-85页

作者： ZHOU Pei TIAN Wen-Dong MA Yu-Gang CAI Xiang-Zhou fang de-qing WANG Hong-Wei Shanghai Institute of Applied Physics Chinese Academy of SciencesPO Box 800-204Shanghai 201800 Graduate School of the Chinese Academy of Sciences Beijing 100049

Extensive calculations on isoscaling behavior with the sequential-decay model GEMINI are performed for the mediate-heavy nuclei in the mass range A=110 and at excitation energies of up to 3 MeV per *** can still be observed after entire−step decays are considered for the light products as in the only first-step decay process *** between the products after the first-step decay and the ones after entire-step decay demonstrates that multi-step secondary sequential decay strongly influences the isoscaling parametersα,βas well as the fragment isospin *** entire−step decays,the isoscaling parametersαandβare decreased and the fragment isospin distribution can better reproduce the isospin distribution shape as the experimental data.

关键词： scaling decay excitation

Study on Excitation Function and Isospin dependencies of Total Reaction Cross Section via the Boltzmann-Uehling-Uhlenbeck Model

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Chinese Physics Letters 2000年第8期17卷 565-567页

作者： CAI Xiang-Zhou SHEN Wen-qing FENG Jun fang de-qing MA Yu-Gang SU Qian-Min ZHANG Hu-Yong HU Peng-Yun Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 CCAST(WorId Laboratory) P.O.Box 8730Beijing 100080

The excitation function and isospin dependencies ofσR have been investigated by using the Boltzmann-Uehling-Uhlenbeck(BUU)model with a square-type density *** the width parameter of the square distribution is obtained by fittingσR at relativistic energies,the BUU-model can reproduce the experimental data at intermediate energies better than Glauber *** systematical underestimation ofσR at intermediate energy by Glauber model was removed out now by BUU calculation *** is also found thatσR is sensitive to nuclear equation of state andσin-NN *** difference factor d defined in text is sensitive to the nuclear structure such as neutron halo and neutron skin,etc.

关键词： BUU removed excitation

Poissonian Reducibility and Thermal Scaling in Nuclear Dissociation

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Chinese Physics Letters 2001年第7期18卷 897-899页

作者： MA Yu-Gang SHEN Wen-qing ZHU Zhi-Yuan ZHANG Hu-Yong YU Li-Ping CAI Xiang-Zhou fang de-qing ZHONG Chen Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 department of Physics Ningbo UniversityNingbo 315211

The emission of clusters in the nuclear dissociation was investigated within the framework of isospin dependent lattice gas *** observed in the recent experimental data,it was found that the emission probability of individual cluster is Poissonian and thermal scaling was observed in the linear Arrhenius plots made from the average multiplicity of each cluster as a function of the inverse ***‘emission barriers’were extracted from the slopes of the Arrhenius plots and mainly depends on the surface energy of the cluster.

关键词： temperature cluster. cluster

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关于太阳墙试验小室的探讨

太阳能学报 1986年第1期7卷 80-85页

作者：方贤德清华大学

本文从分析太阳墙向室内的供热特性入手,对影响其供热性能的主要因素作了具体分析,提出了设计经济有效的太阳墙试验小室的依据。

关键词：太阳墙小室通风口实体墙花格墙蓄热墙

detector Calibration by Monte Carlo Simulation Based on the Energy-Range Relationship of Energetic Ions

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Chinese Physics Letters 1999年第1期16卷 15-17页

作者： fang de-qing FENG Jun CAI Xiang-zhou WANG Jian-song SHEN Wen-qing MA Yu-gang ZHU Yong-tai LI Song-lin WU He-Yu GOU Quan-bu JIN Gen-ming ZHAN Wen-long GUO Zhong-yan XIAO Guo-qing Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

The experimental measurement of the total interaction cross sections of N,C,B,and Be isotopes on 12C target at medium energies is described.A new formula that gives a good description of the energy-range relationship of energetic ions over a wide energy range is *** energy calibration of detectors is made by a Monte Carlo simulation method based on this new formula.

关键词： formula interaction Energetic

Isospin Effect of Fragmentation Reaction on the Isotopic Distribution Producedin Intermediate Energy Heavy Ion Collisions

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Chinese Physics Letters 2000年第4期17卷 267-269页

作者： fang de-qing SHEN Wen-qing FENG Jun CAI Xiang-Zhou WANG Jian-song SU Qian-Min MA Yu-Gang Zhu Yong-tai LI Song-Lin WU He-Yu GOU Quan-bu JIN Gen-Ming ZHAN Wen-Long GUO Zhong-Yan XIAO Guo-qing Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

Fragments produced in the reaction of 60 MeV/n^(18)O on Be have been measured *** isotopic distribution of fragmentation reaction is well reproduced by a modified statistical abrasion-ablation model It is predicted that the isotopic distribution shifts toward the neutron rich side for neutron rich projectile,but this isospin effect decreases with the increase of the atomic number difference Z-Z_(A)and disappears at last,where Z and Z_(A)are atomic numbers of the isotopic distribution and the projectile respectively.

关键词： distribution atomic Collisions