Chinese Physics C > 1996, Vol. 20 > Issue(12): 1091-1096

Isospin Effects on Pre-equilibrium NucleonEmission in Heavy Ion Collisions

Institute of Modem Physics,The Chinese Academy of Sciences,Lanzhou 730000

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Abstract：
The isospin-dependent symmetry energy,Coulomb energy and nucleon-nucleon 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 nucleons is higher than that of the reaction system and the symmetry energy enhances the emission of neutron but reduces the emission of proton,at the same time,that the isospin-dependent nucleon-nucleon cross sections favour the emission of both neutron and proton,but they seem to be more beneficial to the emission of proton.

References

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D.Hilscher iet al/i,iPhys/i.iRev/i.,C36（1987）208.[2] DHilscher,inProc.ofaSpecialists's Meetingon Preequilibrium Nuclear Reactions,Semmering,Austria,10-12th,Feb1988.[3] DPolster iet al/i.,in Book of abstracts,International Noclear Physics Conference,Wieshaden Germany,July26-Aug.1,1992,p3.3.8.[4] 朱全伶、葛凌霄、张晓东，高能物理与核物理，18（1994）853.[5] 朱全伶、葛凌霄、李祝霞，高能物理与核物理，16（1992）658.[6] K.Chen iet al/i,iPhys/i iRev/i.,166（1968）949.[7] 葛凌霄，中能重离子碰撞动力学，中科院近物所研究生讲义，p264[8] A.玻尔，B.R.莫特逊，原子核结构，第一卷，第二分册，科学出版社，1976,p182.[9] Bao-AnLi,J #934; rgen Randrup,Probing isospin dependent reactinn dynamics using preequilibrium Nucleons,iPhys/i.iRev/i.,C,to be published.

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Chen Liewen, Zhang Xiaodong and Ge Lingxiao. Isospin Effects on Pre-equilibrium NucleonEmission in Heavy Ion Collisions[J]. Chinese Physics C, 1996, 20(12): 1091-1096.

Chen Liewen, Zhang Xiaodong and Ge Lingxiao. Isospin Effects on Pre-equilibrium NucleonEmission in Heavy Ion Collisions[J]. Chinese Physics C, 1996, 20(12): 1091-1096. shu

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Received: 1900-01-01
Revised: 1900-01-01

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Isospin Effects on Pre-equilibrium NucleonEmission in Heavy Ion Collisions

Corresponding author:Chen Liewen,

Institute of Modem Physics,The Chinese Academy of Sciences,Lanzhou 730000

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1996-12-05

Abstract:The isospin-dependent symmetry energy,Coulomb energy and nucleon-nucleon 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 system⁴⁰Ar+⁴⁰Ar at the incident energy of 25 MeV/u.It is observed that the ratio of neutron to proton of pre-equilibrium nucleons is higher than that of the reaction system and the symmetry energy enhances the emission of neutron but reduces the emission of proton,at the same time,that the isospin-dependent nucleon-nucleon cross sections favour the emission of both neutron and proton,but they seem to be more beneficial to the emission of proton.