First measurement of beta-decay properties of the proton drip-line nucleus 60Ga

Mazzocchi, C.; Janas, Z.; Döring, J.; Axiotis, M.; Batist, L.; Borcea, R.; Cano-Ott, D.; Caurier, E.; Angelis, G. de; Farnea, E.; Fassbender, A.; Gadea, A.; Grawe, H.; Jungclaus, A.; Kapica, M.; Kirchner, R.; Kurcewicz, J.; Lenzi, S.; Mart'Inez, T.; Mukha, I.; N'Acher, E.; Napoli, D. R.; Roeckl, E.; Rubio, B.; Schwengner, R.; Tain, J. L.; Ur, C. A.

First measurement of beta-decay properties of the proton drip-line nucleus 60Ga

Mazzocchi, C.; Janas, Z.; Döring, J.; Axiotis, M.; Batist, L.; Borcea, R.; Cano-Ott, D.; Caurier, E.; de Angelis, G.; Farnea, E.; Fassbender, A.; Gadea, A.; Grawe, H.; Jungclaus, A.; Kapica, M.; Kirchner, R.; Kurcewicz, J.; Lenzi, S.; Mart'Inez, T.; Mukha, I.; N'Acher, E.; Napoli, D. R.; Roeckl, E.; Rubio, B.; Schwengner, R.; Tain, J. L.; Ur, C. A.

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 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.

Keywords: Properties of nuclei; nuclear energy levels; Beta decay; 21. Shell model

European Physical Journal A 12, 269-277 (2001)

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