A=40～60质量区的中子光学势及色散关系分析

Neutron Optical Potential and Dispersion Relation Analysis for A = 40～60

本文评述了A=40～60质量区的光学模型,分析并研究了全截面随光学势参数变化的灵敏性。各种势参数的比较分析表明,虽然在较高能区许多组势参数都能精确地符合全截面实验数据,但在低能区所有计算结果都明显高于实验值。利用包括了色散项的光学模型对^(40)Ca的中子散射作了自洽分析,能够消除低能区全截面的反常。

This paper makes a review of the optical model in the mass region ofA=40～60, and an analysis of the sensitiveness of the variation of the totalcross section with the optical potential parameters. The comparative analy-sis of different parametrizations of the spherical optical (SOP) shows thatthe calculating results of the optical potential parameters at low energiesare obviously greater than all experimental values, although many groupsof potential parameters at higher energies precisely fit the experimentaldata of the total cross sections. A consistent analysis using the dispersionrelation removes the anomaly at low energies in the total cross sections forthe case of ^(40)Ca.