EPJ

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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 12, 269-277 (2001)

First measurement of $\mth{\beta}$-decay properties of the proton drip-line nucleus $\chem{^{60}Ga}$

C. Mazzocchi1, 2, Z. Janas1, 3, J. Döring1, M. Axiotis4, L. Batist5, R. Borcea1, D. Cano-Ott6, E. Caurier7, G. de Angelis4, E. Farnea4, 8, A. Faßbender1, A. Gadea4, 9, H. Grawe1, A. Jungclaus10, M. Kapica1, R. Kirchner1, J. Kurcewicz1, S.M. Lenzi8, T. Martínez4, 9, I. Mukha1, E. Nácher9, D.R. Napoli4, E. Roeckl1, B. Rubio9, R. Schwengner11, J.L. Tain9 and C.A. Ur8

1  Gesellschaft für Schwerionenforschung, Darmstadt, D-64291 Darmstadt, Germany
2  Universitá degli Studi di Milano, I-20133 Milano, Italy
3  Institute of Experimental Physics, University of Warsaw, PL-00681 Warsaw, Poland
4  Laboratori Nazionali di Legnaro - INFN, I-35020 Legnaro, Italy
5  St. Petersburg Nuclear Physics Institute, RU-188-350 Gatchina, Russia
6  Department of Nuclear Fission, CIEMAT, E-28040 Madrid, Spain
7  Institut de Recherches Subatomiques (IN2P3-CNRS-Université Louis Pasteur), F-67037 Strasbourg Cedex 2, France
8  Dipartimento di Fisica dell'Universitá di Padova and INFN, I-35131 Padova, Italy
9  Instituto de Fisica Corpuscular, CSIC-Universidad de Valencia, E-46100 Burjassot-Valencia, Spain
10  Departamento de Fisica Teórica, Universidad Autónoma de Madrid, E-28049 and Instituto Estructura de la Materia, CSIC, E-28006 Madrid, Spain
11  Forschungszentrum Rossendorf, D-01314 Dresden, Germany

c.mazzocchi@gsi.de

(Received: 4 September 2001 / Revised version: 23 October 2001 Communicated by J. Äystö )

Abstract
By using the fusion-evaporation reaction 28Si( 36Ar,p3n) and spectroscopy of $\beta$-delayed $\gamma$-rays and charged particles on mass-separated sources, $\beta$-decay properties of the neutron-deficient isotope 60Ga were studied for the first time. The half-life of 60Ga was determined to be 70(15) ms, and, based on $\beta\gamma\gamma$ coincidences, the isobaric-analogue state in 60Zn was identified at 4851.9(7) keV. A semiempirical proton separation energy value of 40(70) keV was deduced for 60Ga. The experimental results on half-life, mass excess, proton separation energy, and structure of the 60Zn daughter states are discussed in comparison with various model predictions, including large-scale shell model calculations.

PACS
21.10.-k - Properties of nuclei; nuclear energy levels.
23.40.-s - Beta decay; double beta decay; electron and muon capture.
21.60.Cs - Shell model.

© Società Italiana di Fisica, Springer-Verlag 2001

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