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Low-spin states in Ge-80 populated in the beta decay of the Ga-80 3(-) isomer

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Fraile Prieto, Luis Mario and Mach, Henryk Andrzej and Paziy, Vadym and otros, ... (2021) Low-spin states in Ge-80 populated in the beta decay of the Ga-80 3(-) isomer. Physical review C, 104 (2). ISSN 2469-9985

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Official URL: https://doi.org/10.1103/PhysRevC.104.024317




Abstract

The structure of Ge-80 has been investigated at the ISOLDE facility at CERN. A previous study reported for the first time a low-lying 0(2)(+) intruder state at 639 keV, based on the coincidence with a previously unobserved 1764-keV gamma ray, and suggested it as evidence for shape coexistence in Ge-80. We used the beta decay from the 3(-) 22.4-keV state in Ga-80 to enhance the population of low-spin states in Ge-80, including any excited 0(+) level, and gamma gamma coincidences to investigate it. We observed a 1764-keV gamma ray in coincidence with strong transitions in Ge-80, thus not feeding the proposed 639-keV 0(2)(+). No connecting transitions from previously known levels to the 639-keV and 2403-keV 2(3)(+) states could be established either. Shell-model calculations for Ge isotopes and N = 48 isotones were performed. They succeed to explain most of the experimental levels, but fail to reproduce the presence of a 0(2)(+) state below approximate to 1200 keV in Ge-80. Our experimental findings and shell-model calculations are difficult to reconcile with a very low-lying 0(2)(+) state in Ge-80.


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Artículo firmado por 30 autores. This work was supported by Spanish national projects FPA2015-65035-P, RTI2018-098868-B-I00, and PID2019-104390GB-I00, by Grupo de Física Nuclear (GFN) at Universidad Complutense (Spain), by the U.S. DoE Grant No. DE-FG02-94ER40834, and by the German BMBF Grant 05P19PKFNA. The support by the European Union Seventh Framework through ENSAR (Contract No. 262010) and by the ISOLDE Collaboration and technical teams is acknowledged.

Uncontrolled Keywords:Shape coexistence; Shell-model; Isotopes; Nuclei; Beam
Subjects:Sciences > Physics > Nuclear physics
ID Code:67966
Deposited On:28 Sep 2021 08:08
Last Modified:28 Sep 2021 10:04

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