Isospin Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision

ZHAO Qiang; GUO Wen-Jun; LIU Jian-Ye; ZUO Wei; WANG Shun-Jin

Chinese Physics C> 2001, Vol. 25> Issue(3) : 244-250

Isospin Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Science, Lanzhou 730000, China3 Institute of Modern Physics, South West Jiaotong University, Chengdu 610031, China

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The isospin dependence of preequilibrium nucleon emission for the neutron-deficient colliding system and neutron-rich system has been studied in the wide beam energy region. The calculation results show that the ratio of preequilibrium emission neutrons to protons is sensitive to the symmetrical potential and insensitive to the isospin dependence of in-medium nucleonnucleon collision cross section from low beam energy region to high energy region, in which nucleonnucleon collision dynamics is dominant, namely the isospin dependence of in medium nucleonnucleon cross section excites neutron and proton to be emitted with about the same probability in wide beam energy region. At the same time, the neutrons and protons are excited to be emitted with the same probability for Pauli potential, momentum dependence interaction and impact parameter, even though their effects on preequilibrium neutron number and proton number are obvious. The ratio of preequilibrium neutrons to protons for neutron rich colliding system is larger than the initial value of neutron proton ratio of colliding system, but that for neutron-deficient system is less than the initial value. In this case, one can compare the theoretical results with the experimental data systematically to extract information on the symmetrical potential.

References

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ZHAO Qiang, GUO Wen-Jun, LIU Jian-Ye, ZUO Wei and WANG Shun-Jin. Isospin Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision[J]. Chinese Physics C, 2001, 25(3): 244-250.

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Received: 2000-03-22
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Isospin Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision

Corresponding author: ZHAO Qiang,

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Science, Lanzhou 730000, China3 Institute of Modern Physics, South West Jiaotong University, Chengdu 610031, China

Received Date: 2000-03-22

Accepted Date: 1900-01-01

Available Online: 2001-03-05

Abstract: The isospin dependence of preequilibrium nucleon emission for the neutron-deficient colliding system and neutron-rich system has been studied in the wide beam energy region. The calculation results show that the ratio of preequilibrium emission neutrons to protons is sensitive to the symmetrical potential and insensitive to the isospin dependence of in-medium nucleonnucleon collision cross section from low beam energy region to high energy region, in which nucleonnucleon collision dynamics is dominant, namely the isospin dependence of in medium nucleonnucleon cross section excites neutron and proton to be emitted with about the same probability in wide beam energy region. At the same time, the neutrons and protons are excited to be emitted with the same probability for Pauli potential, momentum dependence interaction and impact parameter, even though their effects on preequilibrium neutron number and proton number are obvious. The ratio of preequilibrium neutrons to protons for neutron rich colliding system is larger than the initial value of neutron proton ratio of colliding system, but that for neutron-deficient system is less than the initial value. In this case, one can compare the theoretical results with the experimental data systematically to extract information on the symmetrical potential.

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Isospin Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision

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