Journal of Nuclear and Radiochemical Sciences
Online ISSN : 1883-5813
Print ISSN : 1345-4749
ISSN-L : 1345-4749
Systematic Studies of Asymmetric Mass Distributions in Proton-induced Fission of Actinides
S. GotoD. KajiI. NishinakaY. NagameS. IchikawaK. TsukadaM. AsaiH. HabaS. MitsuokaK. NishioM. SakamaY. L. ZhaoK. SuekiM. TanikawaK. TakamiyaH. KudoH. Nakahara
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2002 Volume 3 Issue 1 Pages 63-65


In order to clarify the relationship between a mass distribution and shell structure of the fission fragments in nuclear fission, the fragment mass and the kinetic energy distributions in the proton-induced fission of plutonium isotopes, 239, 242, 244Pu, were precisely measured using a double time-of-flight system. It was found that the position of the light side of the heavy asymmetric mass distributions shifts to a larger fragment mass number according to the neutron-proton ratio, Nf/Zf, of the fissioning nucleus. The result is qualitatively explained by the change of the most probable mass number of fission fragments for Z=50 proton shell.

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