Elsevier

Nuclear Physics A

Volume 171, Issue 1, 9 August 1971, Pages 31-43
Nuclear Physics A

Neutron-induced fission cross sections of 242Pu and 244Pu

https://doi.org/10.1016/0375-9474(71)90360-5Get rights and content

Abstract

The neutron fission cross sections of 242Pu and 244Pu have been measured between 20 eV and 10 MeV using a nuclear explosion as a source of neutrons. Intermediate structure is observed in both isotopes with the following DII level spacings: 242Pu, DII = 600+189−116 eV; 244Pu, DII = 1500+750/t-375 eV. The corresponding DI level spacings are 242Pu, DI = 18.7±1.9 eV and 244Pu, DI = 11.4±4 eV. In 242Pu a strong increase in the average fission width with energy in the 10 keV to 100 keV energy region was observed. This rise can be interpreted either as a vibrational level in the intermediate well weakly damped into class II compound levels or the opening of a p-wave fission barrier

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    Work performed under the auspices of the US Atomic Energy Commission.

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