Isospin Effects on Radial Expansion Flow

CHEN LieWen; ZHANG FengShou; JIN GenMing; LIU JianYe; ZHU ZhiYuan

Chinese Physics C> 2000, Vol. 24> Issue(2) : 153-159

Isospin Effects on Radial Expansion Flow

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China3 CCAST World Laboratory Beijing 100080, China4 Shanghai Institute of Nuclear Research, The Chinese Academy of Sciences, Shanghai 201800, China

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Abstract：
Within the framework of an isospin-dependent quantum molecular dynamics model which includes isospin-dependent symmetry energy, Coulomb energy, nucleon-nucleon cross sections, Pauli blocking, and initialization, we have shown that there is a strong isospin dependence of the radial expansion flow from the symmetric central collisions at incident energies of a few hundred MeV per nucleon. It is found that the more neutron-rich system exhibits smaller radial expansion flow, which is shown to result from the isospin dependence of nucleon-nucleon cross sections and to be independent of the nuclear symmetry energy. It suggests that the experimental measurement of the radial expansion flow for reaction systems with different ratios of neutron to proton provide a novel method for determining the isospin dependent in-medium nucleon-nucleon cross sections.

References

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CHEN LieWen, ZHANG FengShou, JIN GenMing, LIU JianYe and ZHU ZhiYuan. Isospin Effects on Radial Expansion Flow[J]. Chinese Physics C, 2000, 24(2): 153-159.

CHEN LieWen, ZHANG FengShou, JIN GenMing, LIU JianYe and ZHU ZhiYuan. Isospin Effects on Radial Expansion Flow[J]. Chinese Physics C, 2000, 24(2): 153-159. shu

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Received: 1998-12-16
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Isospin Effects on Radial Expansion Flow

Corresponding author: CHEN LieWen,

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China3 CCAST World Laboratory Beijing 100080, China4 Shanghai Institute of Nuclear Research, The Chinese Academy of Sciences, Shanghai 201800, China

Received Date: 1998-12-16

Accepted Date: 1900-01-01

Available Online: 2000-02-05

Abstract: Within the framework of an isospin-dependent quantum molecular dynamics model which includes isospin-dependent symmetry energy, Coulomb energy, nucleon-nucleon cross sections, Pauli blocking, and initialization, we have shown that there is a strong isospin dependence of the radial expansion flow from the symmetric central collisions at incident energies of a few hundred MeV per nucleon. It is found that the more neutron-rich system exhibits smaller radial expansion flow, which is shown to result from the isospin dependence of nucleon-nucleon cross sections and to be independent of the nuclear symmetry energy. It suggests that the experimental measurement of the radial expansion flow for reaction systems with different ratios of neutron to proton provide a novel method for determining the isospin dependent in-medium nucleon-nucleon cross sections.

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通讯作者: 陈斌, bchen63@163.com

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