Neutron Absorption Cross Sections of Radioactive La140 and Two Stable Cerium Isotopes
Neutron Absorption Cross Sections of Radioactive La140 and Two Stable Cerium Isotopes
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放射性 La140 和两种稳定铈同位素的中子吸收截面
DOI：
10.1063/1.1747273
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发表时间：
1949
影响因子：
4.4
通讯作者：
J. S. Waddell
中科院分区：
文献类型：
--
作者：
S. Katcoff;J. A. Leary;K. Walsh;R. Elmér;S. S. Goldsmith;L. Hall;E. G. Newbury;J. Povelites;J. S. Waddell
两份40小时的多份居里样品。La140在洛斯阿拉莫斯均质堆上用慢中子照射了24小时。少量的3.7小时。将形成的La141分解成28天的Ce141，然后对其进行放射化学提取和计数。根据测量的活度、中子通量和已知的半衰期，计算出40小时横截面的值为3.1±1.0谷仓。拉140。测得稳定的Ce140和Ce142的热中子吸收截面分别为0.27±0.06和0.105±0.020谷仓。
Two multi‐curie samples of 40‐hr. La140 were irradiated with slow neutrons at the Los Alamos homogeneous pile for 24 hours. The small amount of 3.7‐hr. La141 formed was allowed to decay to 28‐day Ce141 which was then radio‐chemically extracted and counted. From the activity measured, the neutron flux, and the known half‐lives, a value of 3.1±1.0 barns was calculated for the cross section of 40‐hr. La140. The thermal neutron absorption cross sections of stable Ce140 and Ce142 were also measured and found to be 0.27±0.06 and 0.105±0.020 barn, respectively, per atom of the naturally occurring element.