Electron-capture delayed fission properties of 242Es

D. A. Shaughnessy, J. L. Adams, K. E. Gregorich, M. R. Lane, C. A. Laue, D. M. Lee, C. A. McGrath, J. B. Patin, D. A. Strellis, E. R. Sylwester, P. A. Wilk, and D. C. Hoffman
Phys. Rev. C 61, 044609 – Published 20 March 2000
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Abstract

Electron-capture delayed fission of 242Es produced via the 233U(14N,5n)242Es reaction at 87 MeV (on target) was observed to decay with a half-life of 11±3s, consistent with the reported α-decay half-life of 242Es of 164+6s. 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±18MeV. Based on the ratio of the measured number of fission events to the measured number of α decays from the electron-capture daughter 242Cf (100% α 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.

  • Received 4 August 1999

DOI:https://doi.org/10.1103/PhysRevC.61.044609

©2000 American Physical Society

Authors & Affiliations

D. A. Shaughnessy, J. L. Adams, K. E. Gregorich, M. R. Lane, C. A. Laue, D. M. Lee, C. A. McGrath*, J. B. Patin, D. A. Strellis, E. R. Sylwester, P. A. Wilk, and D. C. Hoffman

  • Nuclear Science Division, Lawrence Berkeley National Laboratory, MS 70-319, Berkeley, California 94720
  • Chemistry Department, University of California, Berkeley, California 94720

  • *Present address: MS-H831, Los Alamos National Laboratory, Los Alamos, NM 87545.
  • Also at Nuclear Engineering Department, University of California, Berkeley, CA 94720.
  • Present address: Glenn T. Seaborg Institute for Transactinium Science, L-231, Lawrence Livermore National Laboratory, Livermore, CA 94551.

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Vol. 61, Iss. 4 — April 2000

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