β-delayed proton decay of a high-spin isomer in A94g

I. Mukha, L. Batist, E. Roeckl, H. Grawe, J. Döring, A. Blazhev, C. R. Hoffman, Z. Janas, R. Kirchner, M. La Commara, S. Dean, C. Mazzocchi, C. Plettner, S. L. Tabor, and M. Wiedeking
Phys. Rev. C 70, 044311 – Published 19 October 2004

Abstract

The decay of the (7+) and (21+) isomers of the N=Z isotope A94g was studied at the GSI on-line mass separator by measuring β-delayed protons, γ rays, proton-γ and proton-γγ coincidences as well as the β-strength distribution. We have observed high-spin (up to 392) states in R93h populated by proton emission following the β decay of the A94g isomers. The major part of the population is related to the β decay of the known (7+) isomer whose half-life is 0.61(2)s. The assignment of the high-spin (21+) isomer in A94g with a half-life of 0.39(4)s has been confirmed. The excitation energy and β-decay energy of the (21+) isomer were measured to be at least 5.4 and 17.7MeV, respectively. At this excitation energy, the (21+) isomer is expected to be unbound to direct one-proton, two-proton, or α decays. The remarkably long half-life of the (21+) isomer with the highest spin and excitation energy ever observed for β-decaying nuclei makes a new textbook example of a nuclear high-spin trap. The branching ratios for β-delayed proton emission are about 20% and 27% for the decays of the (7+) and (21+) isomers, respectively. The properties of the experimentally identified R93h levels are discussed in comparison to shell-model predictions.

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  • Received 4 June 2004

DOI:https://doi.org/10.1103/PhysRevC.70.044311

©2004 American Physical Society

Authors & Affiliations

I. Mukha1,2,*, L. Batist3, E. Roeckl2, H. Grawe2, J. Döring2, A. Blazhev2,4, C. R. Hoffman5, Z. Janas6, R. Kirchner2, M. La Commara7, S. Dean1, C. Mazzocchi2,†, C. Plettner2,‡, S. L. Tabor5, and M. Wiedeking5

  • 1Instituut voor Kern- en Stralingsfysica, K. U. Leuven, B-3001 Leuven, Belgium
  • 2Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
  • 3St. Petersburg Nuclear Physics Institute, RU-188350 Gatchina, Russia
  • 4University of Sofia, BG-1164, Sofia, Bulgaria
  • 5Florida State University, Tallahassee, Florida 32306, USA
  • 6Warsaw University, PL-00681 Warsaw, Poland
  • 7Università “Federico II” and INFN Napoli, I-80126 Napoli, Italy

  • *Electronic address: ivan.mukha@fys.kuleuven.ac.be
  • Present address: University of Tennessee, Knoxville, TN 37996, USA.
  • Present address: Yale University, New Haven, CT 06520, USA.

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Vol. 70, Iss. 4 — October 2004

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