β decay of 66Co, 68Co, and 70Co

W. F. Mueller, B. Bruyneel, S. Franchoo, M. Huyse, J. Kurpeta, K. Kruglov, Y. Kudryavtsev, N. V. S. V. Prasad, R. Raabe, I. Reusen, P. Van Duppen, J. Van Roosbroeck, L. Vermeeren, L. Weissman, Z. Janas, M. Karny, T. Kszczot, A. Płochocki, K.-L. Kratz, B. Pfeiffer, H. Grawe, U. Köster, P. Thirolf, and W. B. Walters
Phys. Rev. C 61, 054308 – Published 21 April 2000
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Abstract

The neutron-rich nuclei, 66Co, 68Co, and 70Co were produced using a laser-ionization isotope-separation on-line method. The resulting β-delayed γ decay was studied. The half-life of 66Co is measured to be 0.18(1) s. Two β-decaying states are identified in 68Co with half-lives of 0.23(3) and 1.6(3) s. In addition, two β-decaying states are observed in 70Co with half-lives of 0.12(3) and 0.50(18) s. From the β decay of these states in 66,68,70Co, many new excited levels are established in 66Ni, 68Ni, and 70Ni. These results are compared to the valence mirror nuclei in the N=50 region as well as with shell-model calculations. It can be concluded that collective excitations appear to play an increasingly important role with increasing occupation of the νg9/2 orbital.

  • Received 29 November 1999

DOI:https://doi.org/10.1103/PhysRevC.61.054308

©2000 American Physical Society

Authors & Affiliations

W. F. Mueller*, B. Bruyneel, S. Franchoo, M. Huyse, J. Kurpeta, K. Kruglov, Y. Kudryavtsev, N. V. S. V. Prasad, R. Raabe, I. Reusen, P. Van Duppen, J. Van Roosbroeck, L. Vermeeren, and L. Weissman

  • Instituut voor Kern- en Stralingsfysica, University of Leuven, B-3001 Leuven, Belgium

Z. Janas, M. Karny, T. Kszczot, and A. Płochocki

  • Insitute of Experimental Physics, Hoza 69, 00-681 Warsaw, Poland

K.-L. Kratz and B. Pfeiffer

  • Institut für Kernchemie, Universität Mainz, D-55099 Mainz, Germany

H. Grawe

  • Gesellschaft für Schwerionenforschung, D-64291, Darmstadt, Germany

U. Köster

  • Physik-Department, Technische Universität München, D-85748 Garching, Germany

P. Thirolf

  • Sektion Physik, Universität München, D-85748 Garching, Germany

W. B. Walters

  • Department of Chemistry, University of Maryland, College Park, Maryland 20742

  • *Present address: NSCL, Michigan State University, East Lansing, MI 48824-1321.
  • Present address: CERN, EP Division, CH-1211, Geneva 23, Switzerland.

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Vol. 61, Iss. 5 — May 2000

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