Absolute and relative surrogate measurements of the 236U(n,f) cross section as a probe of angular momentum effects
Absolute and relative surrogate measurements of the 236U(n,f) cross section as a probe of angular momentum effects
复制标题
236U(n,f) 横截面的绝对和相对替代测量作为角动量效应的探针
DOI：
10.1103/physrevc.76.014606
复制
发表时间：
2007
影响因子：
3.1
通讯作者：
M. Evtimova
中科院分区：
文献类型：
--
作者：
B. Lyles;L. Bernstein;Jason T. Harke;F. Dietrich;J. Escher;I. Thompson;D. Bleuel;R. Clark;P. Fallon;J. Gibelin;A. Macchiavelli;M. McMahan;L. Phair;E. Rodriguez;M. Wiedeking;C. Beausang;S. R. Lesher;B. Darakchieva;M. Evtimova
利用绝对替代技术和相对替代技术，在0-20 MeV的当量中子能量范围内，推导出了~(236)M{U}~($n，f~)截面。来自劳伦斯伯克利国家实验室88英寸回旋加速器的42 MeV束流被用来执行(3)\mathm{he}$确定了(${J}^{\ensuremath{\pi}}=7/{2}^{\ensuremath{-}}$)靶和U靶的拾取反应和裂变衰变几率。$^{235}\mathm{U}$($^{3}\mathm{he}$，$\ensuremathm{U}$($n，f$)和$^{238}\mathrm{U}$($^{3}\mathm{he}$，$\susureath{U}$($n，f$))分别是$^{233}\mathm{U}$($n，f$)的代理。用代理方法提取的横截面与直接测量的横截面进行了比较。探讨了这些截面对${J}^{\ensureath{\pi}}$-总体分布的敏感性。
Using both the absolute and relative surrogate techniques, the $^{236}\mathrm{U}$($n,f$) cross section was deduced over an equivalent neutron energy range of 0 to 20 MeV. A 42 MeV $^{3}\mathrm{He}$ beam from the 88 Inch Cyclotron at Lawrence Berkeley National Laboratory was used to perform a ($^{3}\mathrm{He}$,\ensuremath{\alpha}) pickup reaction on targets of $^{235}\mathrm{U}$ (${J}^{\ensuremath{\pi}}=7/{2}^{\ensuremath{-}}$) and $^{238}\mathrm{U}$ (${J}^{\ensuremath{\pi}}={0}^{+}$) and the fission decay probabilities were determined. The $^{235}\mathrm{U}$($^{3}\mathrm{He}$,$\ensuremath{\alpha}f$) and $^{238}\mathrm{U}$($^{3}\mathrm{He}$,$\ensuremath{\alpha}f$) were surrogates for $^{233}\mathrm{U}$($n,f$) and $^{236}\mathrm{U}$($n,f$), respectively. The cross sections extracted using the surrogate method were compared to directly measured cross sections. The sensitivity of these cross sections to the ${J}^{\ensuremath{\pi}}$-population distributions was explored.