Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions

Chen Liewen; Zhang Xiaodong; Ge Lingxiao

Chinese Physics C> 1997, Vol. 21> Issue(S1) : 465-470

Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions

Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, China

Abstract
HTML
Reference
Related

PDF

Abstract：
The isospin-dependent symmetry energy, Coulomb energy, and N-N cross sections are considered in the quantum molecular dynamics model. The influence of isospin effects on the emission of nucleons is discussed in the head-on collisions of the system ⁴⁰Ar + ⁴⁰Ar at the incident energy of 25 MeV/u. It is observed that the ratio of neutron to proton of pre-equilibrium emission is higher than that of the reaction system. It is found that the symmetry energy enhances the emission of neutron but reduces the emission of proton and that the isospin-dependent N-N cross sections favor the emission of both proton and neutron, but they seem to be more beneficial to the emission of protons.
- pre-equilibrium emission ,
- isospin effects ,
- nucleon-nucleon cross sections ,
- symmetry energy

[1]	Y. Q. He , J. K. Ge , G. J. Fu , H. Jiang . Isospin dependence of the nuclear binding energy. Chinese Physics C, 2021, 45(1): 014106. doi: 10.1088/1674-1137/abc23d
[2]	Wenmei Guo , M. Colonna , V. Greco , U. Lombardo , H.-J. Schulze . The spin-isospin decomposition of the nuclear symmetry energy from low to high density. Chinese Physics C, 2020, 44(5): 054110. doi: 10.1088/1674-1137/44/5/054110
[3]	Wen-Jie Xie , Feng-Shou Zhang . Effects of density-and momentum-dependent potentials in Au+Au collisions at intermediate energies. Chinese Physics C, 2018, 42(10): 104103. doi: 10.1088/1674-1137/42/10/104103
[4]	Ya-Fei Guo , Peng-Hui Chen , Fei Niu , Zhao-Qing Feng . Isospin effect in peripheral heavy-ion collisions at Fermi energies. Chinese Physics C, 2018, 42(12): 124106. doi: 10.1088/1674-1137/42/12/124106
[5]	Mariana Dutra , Odilon Louren , Or Hen , Eliezer Piasetzky , Débora P. Menezes . The symmetry energy γ parameter of relativistic mean-field models. Chinese Physics C, 2018, 42(6): 064105. doi: 10.1088/1674-1137/42/6/064105
[6]	Rongyao Yang , Sina Wei , Weizhou Jiang . Ground-state properties of light kaonic nuclei signaling symmetry energy at high densities. Chinese Physics C, 2018, 42(2): 024102. doi: 10.1088/1674-1137/42/2/024102
[7]	W. M. Seif , A. S. Hashem . Constraints on the nuclear symmetry energy and its density slope from the α decay process. Chinese Physics C, 2018, 42(6): 064104. doi: 10.1088/1674-1137/42/6/064104
[8]	Su-Ya-La-Tu Zhang , Mei-Rong Huang , R. Wada , Xing-Quan Liu , Wei-Ping Lin , Jian-Song Wang . Symmetry energy and experimentally observed cold fragments in intermediate heavy-ion collisions. Chinese Physics C, 2017, 41(4): 044001. doi: 10.1088/1674-1137/41/4/044001
[9]	Ya-Fei Guo , Peng-Hui Chen , Fei Niu , Hong-Fei Zhang , Gen-Ming Jin , Zhao-Qing Feng . Isospin splitting of nucleon effective mass and symmetry energy in isotopic nuclear reactions. Chinese Physics C, 2017, 41(10): 104104. doi: 10.1088/1674-1137/41/10/104104
[10]	Jun-Long Tian , Hai-Tao Cui , Teng Gao , Ning Wang . Effect of Wigner energy on the symmetry energy coefficient in nuclei. Chinese Physics C, 2016, 40(9): 094101. doi: 10.1088/1674-1137/40/9/094101
[11]	Jian Tian , Wei Ye . Effect of pre-equilibrium emission on probing postsaddle nuclear dissipation with neutrons. Chinese Physics C, 2016, 40(9): 094103. doi: 10.1088/1674-1137/40/9/094103
[12]	ZHANG Ao , GUO Wen-Jun , HUANG Jiang-Wei , YANG Lin-Meng . Isospin effect of the in-medium nucleon-nucleon cross section in excited nuclear reactions. Chinese Physics C, 2014, 38(5): 054103. doi: 10.1088/1674-1137/38/5/054103
[13]	LI Cheng , TIAN Jun-Long , QIN Yu-Jiao , LI Jing-Jing , WANG Ning . Determination of the nucleon-nucleon interaction in the ImQMD model by nuclear reactions at the Fermi energy region. Chinese Physics C, 2013, 37(11): 114101. doi: 10.1088/1674-1137/37/11/114101
[14]	LIU Min , LI Zhu-Xia , WANG Ning , ZHANG Feng-Shou . Exploring nuclear symmetry energy with isospin dependence in neutron skin thickness of nuclei. Chinese Physics C, 2011, 35(7): 629-634. doi: 10.1088/1674-1137/35/7/006
[15]	LIU Xiao-Jin , WU Chen , REN Zhong-Zhou . Effects of the density dependence of the symmetry energy on neutron stars. Chinese Physics C, 2010, 34(11): 1709-1713. doi: 10.1088/1674-1137/34/11/008
[16]	GUO Wen-Jun , LIU Jian-Ye . Isospin effects of the Skyrme potential and the momentum dependent interaction at intermediate energy heavy ion collisions. Chinese Physics C, 2008, 32(3): 172-176. doi: 10.1088/1674-1137/32/3/002
[17]	ZHANG Fang , ZUO Wei , CHEN Ji-Yan , ZHOU Zhen-Xiao . Effect of entrance-channel asymmetry on the isospin dependence of nucleon emission in heavy ion collisions. Chinese Physics C, 2008, 32(7): 561-564. doi: 10.1088/1674-1137/32/7/010
[18]	LUO Pei-Yan , ZUO Wei . Influence of two different representations of the G-matrix to the in-medium nucleon-nucleon cross sections. Chinese Physics C, 2008, 32(S2): 70-72.
[19]	Ge Lingxiao , Zeng Xianghua . In-Medium Nucleon-Nucleon Cross Sections in the Nonrelativistic Energy Region. Chinese Physics C, 1995, 19(S4): 389-396.
[20]	Shen Xiaoyan , Shen Pengnian , Yu Youwen , Zhang Zongye . Color Screening Effect and Nucleon-Nucleon Interaction. Chinese Physics C, 1993, 17(S2): 207-213.

Access

Get Citation

Chen Liewen, Zhang Xiaodong and Ge Lingxiao. Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions[J]. Chinese Physics C, 1997, 21(S1): 465-470.

Chen Liewen, Zhang Xiaodong and Ge Lingxiao. Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions[J]. Chinese Physics C, 1997, 21(S1): 465-470. shu

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 1995-12-20

Fund

Supported by the National Natural Science Foundation of China and LWTZ-1298, the Chinese Academy of Sciences.

Article Metric

Article Views(1357)
PDF Downloads(2)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions

Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, China

Received Date: 1995-12-20

Fund Project: Supported by the National Natural Science Foundation of China and LWTZ-1298, the Chinese Academy of Sciences.

Abstract: The isospin-dependent symmetry energy, Coulomb energy, and N-N cross sections are considered in the quantum molecular dynamics model. The influence of isospin effects on the emission of nucleons is discussed in the head-on collisions of the system ⁴⁰Ar + ⁴⁰Ar at the incident energy of 25 MeV/u. It is observed that the ratio of neutron to proton of pre-equilibrium emission is higher than that of the reaction system. It is found that the symmetry energy enhances the emission of neutron but reduces the emission of proton and that the isospin-dependent N-N cross sections favor the emission of both proton and neutron, but they seem to be more beneficial to the emission of protons.