Evaluation of Neutron Capture Gamma-ray Spectra for 89Y 93Nb, 127I, 133Cs, 141Pr, 197Au, natTl, and 209Bi

被引：5

作者：

Kim, Hyeong Il ^{[1
]}

Yi, Mi Ja ^{[1
]}

Lee, Young-Ouk ^{[1
]}

机构：

[1] Korea Atom Energy Res Inst, Taejon 305353, South Korea

来源：

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY | 2007年 / 44卷 / 08期

关键词：

gamma-ray spectra; statistical model; strength function; pygmy resonance; correction function; neutron capture;

D O I：

10.3327/jnst.44.1117

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The neutron capture gamma-ray spectra for 8 nuclides, (89)y, Nb-93, 1271, Cs-133, Pr-141, Au-197, (TI)-T-nat, and Bi-209, were calculated by using the Hauser-Feshbach statistical model, and their results were compared with the available experimental data. Two dominant ingredients to perform the statistical calculation were the level densities described by the Gilbert-Cameron approach with an improved systematics, and the gamma-ray transmission coefficients described by gamma-ray strength functions. Although various gamma-ray strength functions with a Lorentzian formula have been developed by using the photonuclear data or a microscopic analysis, they have failed to reproduce the occasional anomalous bumps observed near or below a neutron binding. In this work, we could reproduce the bumps well by adding a Lorentzian with an energy-temperature dependent width into a giant electric dipole resonance with an enhanced generalized Lorentzian. In addition, we introduced a correction function so as to compensate for the shortcomings due to missing levels or level-cuts.

引用

页码：1117 / 1125

页数：9