Decay of mass-separated Pom199 and Pog199

R. E. Stone, C. R. Bingham, L. L. Riedinger, R. W. Lide, H. K. Carter, R. L. Mlekodaj, and E. H. Spejewski
Phys. Rev. C 31, 582 – Published 1 February 1985
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Abstract

Sources of Pom199 and Pog199 have been produced and mass separated on line. Multiscaled spectra of γ rays, x rays, and conversion electrons, and γ-γ and γ-x-ray coincidences were measured. The M4 isomeric transition of the (13/2)+ state of Po199, with a half-life of 4.17 min, was observed for the first time, permitting the placement of the (13/2)+ and (5/2) levels above the (3/2) ground state. Also, the placement of the (13/2)+ state in Po together with previously reported α-decay Q values made possible the location of the (13/2)+ isomeric state in Pb195. From an analysis of γ-γ-t coincidence data and energy sums, 26 transitions were placed in a decay scheme between 23 levels in Bi199. On the basis of systematics the population of a (1/2)+ isomeric state in Bi199 was deduced. The isomeric (M4) transition to the (9/2) ground state was not observable in the present data; its rate is at least 390 times less than the Weisskopf single particle estimate.

  • Received 20 August 1984

DOI:https://doi.org/10.1103/PhysRevC.31.582

©1985 American Physical Society

Authors & Affiliations

R. E. Stone, C. R. Bingham, L. L. Riedinger, and R. W. Lide

  • The University of Tennessee, Knoxville, Tennessee 37996 and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

H. K. Carter, R. L. Mlekodaj, and E. H. Spejewski

  • UNISOR, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37830

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Vol. 31, Iss. 2 — February 1985

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