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刘建业  郝焕锋  左维  李希国 《物理学报》2008,57(4):2136-2140
核子能量在40—60MeV能区范围,对在两对重离子中心碰撞系统40Ca+48Ca和60Ca+48Ca以及112Sn+112Sn和124Sn+124Sn 的反应中就同位素标度参数α对于核子-核子碰撞截面σmedNNm)的介质 关键词: 同位素标度行为 介质效应 核子-核子碰撞截面 重离子碰撞  相似文献   
2.
This paper summarizes the isoscaling and isospin related studies in asymmetry nuclear reactions by different dynamic and sta tistical models. Isospin dependent quantum molecular dynamics model (IQMD) and lattice gas model (LGM) are used to study the isoscaling properties and isoscaling parameters dependence on incident energies, impact parameters, temperature and other parameters. In the LGM model, the signal of phase transition has been found in free neutron (proton) chemical potential dif ference Δμn or Δ...  相似文献   
3.
In this paper, the isotopic and isotonic distributions of projectile fragmentation products have been simulated by a modified statistical abrasion--ablation model and the isoscaling behaviour of projectile-like fragments has been discussed. The isoscaling parameters α and β have been extracted respectively, for hot fragments before evaporation and cold fragments after evaporation. It looks that the evaporation has stronger effect on α than β. For cold fragments, a monotonic increase of α and β with the increase of Z and N is observed. The relation between isoscaling parameter and the change of isospin content is discussed.  相似文献   
4.
The isoscaling parameters α_(eval) in the fissioning systems,i.e.,those extracted from the Evaluated Nuclear Data Library(ENDFIB-VIII.0) and the Joint Evaluated Fission and Fusion File(JEFF-3.3),show an obvious difference from simple statistic model prediction where only the symmetry energy plays the dominant role.To explain the α_(eval) as a function of the charge number of the fission fragment,a statistic scission point model is adopted.Our analysis shows that the effects of the shell correction,nuclear shape deformation,and intrinsic temperature of fission fragments are indispensable as well as the symmetry energy.Furthermore,an alternative method for extracting the intrinsic temperatures of fission fragments is proposed based on the iso scaling relationship in fission fragments.The intrinsic temperatures of the light fragments are higher than those of the heavy fragments.  相似文献   
5.
刘建业  郭文军  左维  李希国 《物理学报》2008,57(9):5458-5463
对两对重离子中心碰撞系统40C+40Ca 和60Ca+40Ca以及112Sn+112Sn和124Sn+124Sn反应中就同位素标度参数α对于核子-核子碰撞截面的同位旋效应进行了研究.计算结果表明α对同位旋相关核子-核子碰撞截面σmedNN关键词: 同位旋效应 核子-核子截面 机理 同位素标度  相似文献   
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