Eur. Phys. J. A (2004) 22: 455-459
https://doi.org/10.1140/epja/i2004-10047-3

Beta-decay of ⁷¹Co and ⁷³Co

¹ IEP, Warsaw University, ul. Hoża 69, PL-00681, Warsaw, Poland
² GANIL, B.P. 5027, F-14076, Caen Cedex 5, France
³ Gesellschaft für Schwerionenforschung mbH, Darmstadt, D-64291, Darmstadt, Germany
⁴ Physics Division, ORNL, 37830, Oak Ridge, TN, USA
⁵ CEA Bruyéres-le-Châtel DIF/DPTA/SPN, B.P. 12, F-91680, Bruyères-le-Châtel, France
⁶ Department of Physics and Astronomy and NSCL, Michigan State University, 48824-1321, East Lansing, MI, USA
⁷ Department of Physics and Astronomy, University of Tennesse, 37996, Knoxville, TN, USA
⁸ IFIN, P.O. Box MG6, RO-76900, Bucharest-Magurele, Romania
⁹ CEA Saclay, DSM/DAPNIA/SPhN, F-91191, Gif-sur-Yvette Cedex, France
¹⁰ CENBG, B.P. 120, F-33175, Gradignan Cedex, France
¹¹ IPN, F-91406, Orsay Cedex, France
¹² IKS, University of Leuven, Celestijnenlaan 200 D, B-3001, Leuven, Belgium

^* e-mail: sawicka@fuw.edu.pl

Received: 28 April 2004
Accepted: 15 July 2004
Published online: 16 November 2004

Abstract

A decay spectroscopy study of the neutron-rich cobalt isotopes has been performed using fragmentation of a ⁸⁶Kr³⁶⁺ beam and the new LISE2000 spectrometer at GANIL. For ⁷¹Co and ⁷³Co, the β-delayed γ radiation has been observed for the first time, and the half-lives were found to be 79(5) ms and 41(4) ms, respectively. Features of the decay are discussed qualitatively in terms of nuclear models.