Gamow-Teller decay population of ${}^{64}$Ni levels in the decay of ${1}^{+}$ ${}^{64}$Co

Gamow-Teller decay population of $^{64}$ Ni levels in the decay of $1^{+}$ $^{64}$ Co

D. Pauwels, D. Radulov, W. B. Walters, I. G. Darby, H. De Witte, J. Diriken, D. V. Fedorov, V. N. Fedosseev, L. M. Fraile, M. Huyse, U. Köster, B. A. Marsh, L. Popescu, M. D. Seliverstov, A. M. Sjödin, P. Van den Bergh, J. Van de Walle, P. Van Duppen, M. Venhart, and K. Wimmer

Phys. Rev. C 86, 064318 – Published 20 December 2012

Abstract

The $^{64}$ Co $β$ -decay feeding levels in the well-studied $^{64}$ Ni nucleus were investigated. Whereas the previously known $^{64}$ Co decay scheme merely contained 2 $γ$ rays, the decay scheme established in this work contains $18,$ of which 5 are observed in this work and 6 were previously observed in an ( $n$ , $γ$ ) study but not placed in the $^{64}$ Ni level scheme. Surprisingly, one additional level—placed at an excitation energy of $3578.7$ keV—could be determined. The observed $β$ -decay paths involve allowed $ν f_{5 / 2} \to π f_{7 / 2}$ and $ν p_{1 / 2} \to π p_{3 / 2}$ transitions. Three strongly fed levels around 4 MeV are interpreted to possess possible proton-intruder character.

Received 24 September 2012

DOI:https://doi.org/10.1103/PhysRevC.86.064318

Authors & Affiliations

D. Pauwels^1,2, D. Radulov², W. B. Walters³, I. G. Darby², H. De Witte², J. Diriken², D. V. Fedorov⁴, V. N. Fedosseev⁵, L. M. Fraile⁶, M. Huyse², U. Köster⁷, B. A. Marsh⁵, L. Popescu¹, M. D. Seliverstov^2,4, A. M. Sjödin⁸, P. Van den Bergh², J. Van de Walle⁵, P. Van Duppen², M. Venhart^2,9, and K. Wimmer^10,11

¹Belgian Nuclear Research Centre SCK•CEN, Boeretang 200, B-2400 Mol, Belgium
²Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
³Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
⁴Petersburg Nuclear Physics Institute, RU-188300 Gatchina, Russia
⁵ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
⁶Grupo de Física Nuclear, Universidad Complutense, CEI Moncloa, 28040 Madrid, Spain
⁷Institut Laue Langevin, 6 rue Jules Horowitz, F-38042 Grenoble Cedex 9, France
⁸KTH-Royal Institute of Technology, SE-10044 Stockholm, Sweden
⁹Slovak Academy of Sciences, SK-84511 Bratislava, Slovakia
¹⁰Physik Department E12, Technische Universität München, D-85748 Garching, Germany
¹¹National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA

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Vol. 86, Iss. 6 — December 2012

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