| Article | |
| Title | Low-spin states in $^{80}$Ge populated in the $\beta$ decay of the $^{80}$Ga $3^-$ isomer |
| Author(s) | Sekal, S (Algiers U. Sci. Tech. ; CERN) ; Fraile, L M (Madrid U.) ; Lică, R (CERN ; Bucharest, IFIN-HH) ; Borge, M J G (Madrid, Inst. Estructura Materia) ; Walters, W B (Maryland U., Dept. Chem.) ; Aprahamian, A (Notre Dame U.) ; Benchouk, C (Algiers U. Sci. Tech.) ; Bernards, C (Yale U. (main) ; Cologne U.) ; Briz, J A (Madrid, Inst. Estructura Materia) ; Bucher, B (Idaho Natl. Lab.) ; Chiara, C J (Argonne, PHY) ; Dlouhý, Z (Rez, Nucl. Phys. Inst.) ; Gheorghe, I (Bucharest, IFIN-HH) ; Ghiţă, D G (Bucharest, IFIN-HH) ; Hoff, P (U. Oslo (main)) ; Jolie, J (Cologne U.) ; Köster, U (Laue-Langevin Inst.) ; Kurcewicz, W (Warsaw U.) ; Mach, H (Madrid U. ; NCBJ, Warsaw) ; Mărginean, N (Bucharest, IFIN-HH) ; Mărginean, R (Bucharest, IFIN-HH) ; Meliani, Z (Algiers U. Sci. Tech.) ; Olaizola, B (Madrid U. ; CERN) ; Paziy, V (Madrid U.) ; Régis, J M (Cologne U.) ; Rudigier, M (Cologne U.) ; Sava, T (Bucharest, IFIN-HH) ; Simpson, G S (LPSC, Grenoble) ; Stănoiu, M (Bucharest, IFIN-HH) ; Stroe, L (Bucharest, IFIN-HH) |
| Publication | 2021 |
| Number of pages | 12 |
| In: | Phys. Rev. C 104 (2021) 024317 |
| DOI | 10.1103/PhysRevC.104.024317 (publication) |
| Subject category | Nuclear Physics - Experiment |
| Accelerator/Facility, Experiment | CERN ISOLDE |
| Abstract | The structure of $^{80}$Ge 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 $γ$ ray, and suggested it as evidence for shape coexistence in $^{80}$Ge. We used the $\beta$ decay from the $3^-$ 22.4-keV state in $^{80}$Ga to enhance the population of low-spin states in $^{80}$Ge, 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 $^{80}$Ge, 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 $≈1200$ keV in $^{80}$Ge. Our experimental findings and shell-model calculations are difficult to reconcile with a very low-lying $0^+_2$ state in $^{80}$Ge. |
| Copyright/License | publication: Published by the American Physical Society (License: CC BY 4.0) |
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Записът е създаден на 2021-08-19, последна промяна на 2021-08-19