Beta decay of 61Ga
M. Oinonen1 - P. Baumann2 - P. Dendooven1 - Y. Fujita3 - M. Górska4 - H. Grawe4 - Z. Hu4 - Z. Janas5 - A. Jokinen1 - R. Kirchner4 - O. Klepper4 - A. Knipper2 - W. Liu4 - H. Penttilä1 - A. Plochocki5 - M. Ramdhane2 - E. Roeckl4 - G. Walter2 - J. Äystö1
1 Department of Physics, University of Jyväskylä, P.O. Box 35, FIN-40351,
Jyväskylä, Finland
2 Institut de Recherches Subatomiques, F-67037 Strasbourg, France
3 Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
4 Gesellschaft für Schwerionenforschung, Postfach 110552, D-64220 Darmstadt, Germany
5 Institute of Experimental Physics, Warsaw University, PL-00681 Warsaw, Poland
Received: 28 April 1998 / Revised version: 6 October 1998 Communicated by D. Guerreau
Abstract
The 
decay of 61Ga to its mirror nucleus 61Zn has been measured for
the first time by using on-line mass separation and -delayed gamma-ray spectroscopy. The
observed decay strength to the ground state implies superallowed character in accordance with the
systematics of the mirror decays in the sd and fp shell. The feedings observed to four
excited states in 61Zn are consistent with earlier spin-parity assignments based on in-beam
experiments. The ground-state spin and parity for 61Ga were determined to be 3/2-.
PACS
21.10.Hw Spin, parity, and isobaric spin -
23.40.Hc Relation with nuclear matrix elements and nuclear structure -
27.50.+e 
Copyright Springer-Verlag
