Fast neutron induced depopulation of the 180Tam isomer

S. A. Karamian, C. B. Collins, J. J. Carroll, J. Adam, A. G. Belov, and V. I. Stegailov
Phys. Rev. C 59, 755 – Published 1 February 1999
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Abstract

Fast neutron-induced depopulation of the 180Tam(I,Kπ=9,9) isomer to the 1+ ground state was detected by activation techniques. Natural Ta foils together with a 232Th monitoring target were activated using the neutron flux produced from a 7.3 MeV electron beam by a special choice of converters and shields. The Kα2 x-ray line (54.6 keV) of Hf was successfully observed in the γ-ray spectrum from activated Ta and attributed to the decay of 180Tag(T1/2=8.15h). The yields of three reactions 232Th(n,f),181Ta(n,γ)182Ta, and 180Tam(n,n)180Tag, were measured in the same conditions and compared. Finally, the mean probability for 180Tam depopulation after MeV neutron scattering was deduced to approach about 0.4. This establishes almost complete K mixing above the neutron binding energy.

  • Received 19 August 1998

DOI:https://doi.org/10.1103/PhysRevC.59.755

©1999 American Physical Society

Authors & Affiliations

S. A. Karamian1, C. B. Collins2, J. J. Carroll3, J. Adam1, A. G. Belov1, and V. I. Stegailov1

  • 1Joint Institute for Nuclear Research, 141980 Dubna, Russia
  • 2Center for Quantum Electronics, University of Texas at Dallas, Richardson, Texas 75080
  • 3Center for Photon Induced Processes, Department of Physics and Astronomy, Youngstown State University, Youngstown, Ohio 44555

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Vol. 59, Iss. 2 — February 1999

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