Search for the Ga-73 ground-state doublet splitting in the beta decay of Zn-73

0479641 - ÚJF 2018 RIV US eng J - Journal Article
Vedia, V. - Paziy, V. - Fraile, L. M. - Mach, H. - Walters, W. B. - Aprahamian, A. - Bernards, C. - Briz, J. A. - Bucher, B. - Chiara, C. J. - Dlouhý, Zdeněk - Gheorghe, I. - Ghita, D. G. - Hoff, P. - Jolie, J. - Koster, U. - Kurcewicz, W. - Lica, R. - Marginean, N. - Marginean, R. - Olaizola, B. - Regis, J. M. - Rudigier, M. - Sava, T. - Simpson, G. S. - Stanoiu, M. - Stroe, L.
Search for the Ga-73 ground-state doublet splitting in the beta decay of Zn-73.
Physical Review C. Roč. 96, č. 3 (2017), č. článku 034311. ISSN 2469-9985. E-ISSN 2469-9993
Institutional support: RVO:61389005
Keywords : nuclear data sheets * spectroscopy * Ga-73
OECD category: Nuclear physics
Impact factor: 3.304, year: 2017

The existence of two close-lying nuclear states in Ga-73 has recently been experimentally determined: a 1/2(-) spin-parity for the ground state was measured in a laser spectroscopy experiment, while a J(pi\) = 3/2(-) level was observed in transfer reactions. This scenario is supported by Coulomb excitation studies, which set a limit for the energy splitting of 0.8 keV. In this work, we report on the study of the excited structure of Ga-73 populated in the beta decay of Zn-73 produced at ISOLDE, CERN. Using beta-gated, gamma-ray singles, and gamma-gamma coincidences, we have searched for energy differences to try to delimit the ground-state energy splitting, providing a more stringent energy difference limit. Three new half-lives of excited states in Ga-73 have been measured using the fast-timing, method with LaBr3(Ce) detectors. From our study, we help clarify the excited structure of Ga-73 and we extend the existing Zn-73 decay to Ga-73 with 8 new energy levels and 35 gamma transitions. We observe a 195-keV transition consistent with a gamma ray de-exciting a short-lived state in the beta-decay parent Zn-73.
Permanent Link: http://hdl.handle.net/11104/0275613