Decays of Ta176, Lu176, and Lu176m to Levels in Hf176

F. M. Bernthal, J. O. Rasmussen, and J. M. Hollander
Phys. Rev. C 3, 1294 – Published 1 March 1971
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Abstract

The locations of 48 energy levels in Hf176 have been deduced from γ-ray singles, conversion-electron, and γγ coincidence measurements on the ECβ+ decay of Ta176. Over 300γ-ray transitions have been observed in the Ta176 decay spectrum, and about 140 of these have been definitely assigned to the Hf176 level scheme on the basis of 75 γγ coincidence spectra. Spin and parity assignments are proposed for 27 levels besides the ground-state rotationalband members. Less extensive γ-ray singles data from Lu176 and Lu176m decay have also been obtained; these are found to be consistent with the Hf176 level structure proposed on the basis of Ta176 decay data. Two 0+ excitations in Hf176 identified at 1150 and 1293 keV are found to display quite different decay properties. Evidence for the existence of a series of low-spin four-quasiparticle states near 3 MeV is cited. The Hf176 level structure is compared with available theoretical calculations, and a preliminary interpretation of several unusual features of the level scheme is presented.

  • Received 28 September 1970

DOI:https://doi.org/10.1103/PhysRevC.3.1294

©1971 American Physical Society

Authors & Affiliations

F. M. Bernthal* and J. O. Rasmussen

  • Lawrence Radiation Laboratory, University of California, Berkeley, California 94720
  • Yale University, New Haven, Connecticut 06520

J. M. Hollander

  • Lawrence Radiation Laboratory, University of California, Berkeley, California 94720

  • *Present address: Department of Chemistry, Michigan State University, East Lansing, Michigan 48823.

Comments & Replies

Anomalous Excited K=0 Rotational Bands in Heavy Nuclei

S. Das Gupta and A. B. Volkov
Phys. Rev. C 6, 1893 (1972)

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Vol. 3, Iss. 3 — March 1971

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