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Author(s)
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Vedia, V (UCM, Madrid, Dept. Phys.) ; Paziy, V (UCM, Madrid, Dept. Phys.) ; Fraile, L M (UCM, Madrid, Dept. Phys.) ; Mach, H (UCM, Madrid, Dept. Phys. ; NCBJ, Swierk) ; Walters, W B (Maryland U., Dept. Chem.) ; Aprahamian, A (Notre Dame U.) ; Bernards, C (Cologne U. ; Yale U. (main)) ; Briz, J A (Madrid, Inst. Estructura Materia) ; Bucher, B (Notre Dame U. ; LLNL, Livermore) ; Chiara, C J (Maryland U., Dept. Chem. ; Argonne, PHY) ; Dlouhý, Z (Rez, Nucl. Phys. Inst.) ; Gheorghe, I (Bucharest, IFIN-HH) ; Ghiţă, D (Bucharest, IFIN-HH) ; Hoff, P (U. Oslo (main)) ; Jolie, J (Cologne U.) ; Köster, U (Laue-Langevin Inst.) ; Kurcewicz, W (Warsaw U.) ; Lică, R (Bucharest, IFIN-HH) ; Mărginean, N (Bucharest, IFIN-HH) ; Mărginean, R (Bucharest, IFIN-HH) ; Olaizola, B (UCM, Madrid, Dept. Phys. ; TRIUMF) ; Régis, J M (Cologne U.) ; Rudigier, M (Surrey U.) ; Sava, T (Bucharest, IFIN-HH) ; Simpson, G S (LPSC, Grenoble) ; Stănoiu, M (Bucharest, IFIN-HH) ; Stroe, L (Bucharest, IFIN-HH) |
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Abstract
| The existence of two close-lying nuclear states in $^{73}$Ga 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 $^{73}$Ga populated in the $\beta$ decay of $^{73}$Zn 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 $^{73}$Ga have been measured using the fast-timing method with LaBr$_3$(Ce) detectors. From our study, we help clarify the excited structure of $^{73}$Ga and we extend the existing $^{73}$Zn decay to $^{73}$Ga 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 $^{73}$Zn. |