利用断前γ射线多重性提取核耗散的形变关系

Deformation dependence of nuclear dissipation extracted by the prescissionγ-multiplicities

在动力学加统计模型的框架内,采用两种不同坐标关系的核摩擦,对3个热核的断前γ射线多重性进行模拟,在裂变两阶段内通过对γ射线多重性大小的比较,来提取核耗散的形变关系.研究表明,裂变驱动力和核摩擦间的竞争控制断前γ射线的发射,而鞍点的位置则直接影响断前γ射线多重性在两阶段的分布.与断前中子多重性相比,断前γ射线多重性对核摩擦的形变关系更敏感,更适合用来作为提取核耗散形变关系的探针.

The prescissionγ-multiplicities of three hot nuclei are simulated within the framework of the combined dynamical and statistical model,and in the simulations,two kinds of nuclear frictions with diverse coordinate dependence are adopted.In order to extract the deformation dependence of nuclear dissipation,we make some comparisons about the magnitude of prescissionγ-multiplicities calculated by two kinds of nuclear frictions in each period of the deexcitation of hot nuclei.The present study shows that the emission of the prescission giant dipoleγ-ray is controlled by the competition between the fission driving force and the nuclear friction,and the situation of saddle point can directly affect the distribution of the prescissionγ-multiplicity among those two periods.Compared with the prescission neutron multiplicity,theγ-multiplicity is more sensitive for the deformation dependence of nuclear friction,and hence can act as a more suitable probe to extract the deformation dependence of nuclear dissipation.