Spontaneous fission properties of Lr103259

T. M. Hamilton, K. E. Gregorich, D. M. Lee, K. R. Czerwinski, N. J. Hannink, C. D. Kacher, B. Kadkhodayan, S. A. Kreek, M. J. Nurmia, M. R. Lane, M. P. Neu, A. Türler, and D. C. Hoffman
Phys. Rev. C 46, 1873 – Published 1 November 1992
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Abstract

We have measured the mass and kinetic-energy distributions of fragments from the spontaneous fission of Lr259. The Lr259 was produced via the Cm248 (15N,4n) reaction with a production cross section of 100 nb using 81-MeV projectiles. The kinetic energies and times of the alpha particles and coincident fission fragments were measured using our rotating wheel system. From these data the half-life, mass, and kinetic-energy distributions were derived. The total kinetic-energy (TKE) distribution appears to consist of a single component with a most probable pre-neutron-emission TKE of 215±3 MeV. The mass distribution is predominantly symmetric with a full width at half maximum of about 20 mass numbers. These results are consistent with trends observed for other trans-berkelium spontaneously fissioning isotopes. We determined the half-life to be 6.14±0.36 s by measuring its alpha decay and the observed spontaneous fission half-life was consistent with that value. An energy of 8.439±0.010 MeV was measured for the main alpha transition of Lr259. We measured a spontaneous fission to alpha-decay ratio of 0.25±0.03 which results in a partial half-life for spontaneous fission of 31±4 s, if there are no other appreciable modes of decay.

  • Received 1 June 1992

DOI:https://doi.org/10.1103/PhysRevC.46.1873

©1992 American Physical Society

Authors & Affiliations

T. M. Hamilton, K. E. Gregorich, D. M. Lee, K. R. Czerwinski, N. J. Hannink, C. D. Kacher, B. Kadkhodayan, S. A. Kreek, M. J. Nurmia, M. R. Lane, M. P. Neu, A. Türler, and D. C. Hoffman

  • Nuclear Science Division, Lawrence Berkeley Laboratory, MS 70A-3307, Berkeley, California 94720
  • Chemistry Department, University of California, Berkeley, California 94720

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Vol. 46, Iss. 5 — November 1992

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