Electron-capture delayed fission properties of 242Es -: art. no. 044609

被引：22
|
作者：
Shaughnessy, DA
Adams, JL
Gregorich, KE
Lane, MR
Laue, CA
Lee, DM
McGrath, CA
Patin, JB
Stellis, DA
Sylwester, ER
Wilk, PA
Hoffman, DC
机构：
[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[3] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA
来源：
PHYSICAL REVIEW C | 2000年 / 61卷 / 04期
关键词：
D O I：
10.1103/PhysRevC.61.044609
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Electron-capture delayed fission of Es-242 produced via the U-233(N-14,5n)Es-242 reaction at 87 MeV (on target) was observed to decay with a half-life of 11+/-3 s, consistent with the reported alpha-decay half-life of Es-242 of 16(-4)(+6) s. The mass-yield distribution of the fission fragments is highly asymmetric. The average pre-neutron emission total kinetic energy of the fragments was measured to be 183+/-18 MeV. Based on the ratio of the measured number of fission events to the measured number of cu decays from the electron-capture daughter Cf-242 (100% alpha branch), the probability of delayed fission was determined to be 0.006+/-0.002. This value for the delayed fission probability fits the experimental trend of increasing delayed fission probability with increasing Q value for electron capture.
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页数：6
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