α发射数可作为提取同位旋相关平均场的灵敏探针

Number of α Emitted as a Probe of the Isospin Dependent Mean-field

利用同位旋相关的量子分子动力学,对中能重离子碰撞过程中的α发射数的同位旋效应进行了分析。研究表明,α发射数强烈地依赖于同位旋相关平均场的影响,而与同位旋相关核子-核子碰撞截面的依赖较弱,可以作为提取同位旋相关平均场信息的灵敏探针。由于实验上α粒子发射数的观测比较容易,而且在很宽地能量范围内,无论丰中子系统还是缺中子系统都较好地满足上述规律,这样就可以通过实验上对α发射数的探测,来提取介质中同位旋相关平均场的信息。同时建议由实验对缺中子系统的质子发射数进行探测,从中提取同位旋相关核子-核子碰撞截面的信息。

The α emissions in heavy-ion collisions at intermediate energies are studied by using isospin-dependent quantum molecular dynamics model.The number of α emitted is found to be strongly dependent on the isospin-dependent mean-field and weakly on the nucleon-nucleon cross sections.The number of α emitted is easy to be measured in experiment and the above conclusion is still available no matter in neutron-rich systems or in neutron-deficient systems in a wide energy region,so it can be used as an excellent probe for extracting information of the isospin-dependent mean-field.After several years searching,some information of the isospin asymmetry equation of state has been obtained in theoretically.We suggest to investigate the number of α emitted in neutron-rich systems and the number of proton emitted in neutron-deficient systems experimentally to obtain more information of the isospin-dependent mean-field and the isospin-dependent nucleon-nucleon cross section.