arXiv 1003.47262010-03nucl-ex

短寿命态（n，f）截面的测量

Measuring (n,f) cross-sections of short-lived states

J. I. Katz

备注：: 28 pp., 4 figs, revised in response to referees' comments, additional details re sources and volatile Am organometallic compounds
发表信息：: Nuclear Science and Engineering 168, 164--171 (2011)

摘要：

为了检验裂变截面理论，需要测量同一元素的同一同位素的同分异构态和基态的（n，f）截面。这将测试计算仅依赖于自旋和宇称的效应而不混淆依赖于（Z，A）的效应的能力。目前，还没有一种同位素的（n，f）截面在MeV能量下成功地测量，可以进行理论预测。在热能和冷能下，已经有几次对截面U235 m的测量。在这些能量下，横截面预计将由无法计算的共振所主导，因此它可能不是理论预测的有用测试。我提出了测量1/2+（26 m）同分异构体U 235 m和1-（16 h）（比同分异构体寿命短）Am 242 gs裂变谱中子的（n，f）截面的方法。

英文摘要：

In order to test theories of fission cross-sections, it is desirable to measure the (n,f) cross-sections of both an isomeric state and the ground state of the same isotope of the same element. This would test the ability to calculate effects that depend only on spin and parity without the confusion of effects that depend on (Z,A). At present there is no isotope for which the (n,f) cross-section has been measured successfully at MeV energies, where theoretical predictions can be made. There have been a few measurements of the cross-section U235m at thermal and cold energies. At these energies the cross-section is expected to be dominated by incalculable resonances, so that it may not be a useful test of theoretical predictions. I suggest methods for measuring the (n,f) cross-sections to neutrons with a fission spectrum of 1/2+ (26 m) isomeric U235m and of 1- (16 h) (shorter lived than the isomer) Am242gs.

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