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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2504.02156 |
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| _version_ | 1866918156884246528 |
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| author | Li, R. Matea, D. Verney I. Harakeh, M. N. Delafosse, C. Didierjean, F. Ebata, S. Ayoubi, L. A. Falou, H. Al Benzoni, G. Blanc, F. Le Bozkurt, V. Ciemała, M. Deloncle, I. Fallot, M. Gaulard, C. Gottardo, A. Guadilla, V. Guillot, J. Hadyńska-Klęk, K. Ibrahim, F. Jovancevic, N. Kankainen, A. Lebois, M. Martínez, T. Napiorkowski, P. Roussiere, B. Sobolev, Yu. G. Stefan, I. Stukalov, S. Thisse, D. Tocabens, G. |
| author_facet | Li, R. Matea, D. Verney I. Harakeh, M. N. Delafosse, C. Didierjean, F. Ebata, S. Ayoubi, L. A. Falou, H. Al Benzoni, G. Blanc, F. Le Bozkurt, V. Ciemała, M. Deloncle, I. Fallot, M. Gaulard, C. Gottardo, A. Guadilla, V. Guillot, J. Hadyńska-Klęk, K. Ibrahim, F. Jovancevic, N. Kankainen, A. Lebois, M. Martínez, T. Napiorkowski, P. Roussiere, B. Sobolev, Yu. G. Stefan, I. Stukalov, S. Thisse, D. Tocabens, G. |
| contents | The $β$-delayed spectroscopy of $^{80}$Ge has been studied using sources of ground and low-lying isomeric states of $^{80}$Ga. A hybrid $γ$-ray spectrometer was used, composed of high-purity germanium (HPGe) detectors for low-energy $γ$-ray detection, phoswich detectors from the PARIS array for high-energy $γ$ rays and a plastic detector for $β$ tagging. The new decay level schemes are presented, with 13 and 14 states $β$ populated by $^{80g}$Ga and $^{80m}$Ga, respectively, being reported for the first time. We quantitatively compare summed intensities of first-forbidden and previously reported Gamow-Teller $β$ transitions [R. Li et al., \href{https://doi.org/10.1103/PhysRevC.111.034303}{Phys. Rev. C 111, 034303 (2025)}]. The upper-limit fractions of first-forbidden transitions contributing to the decays of $^{80g}$Ga and $^{80m}$Ga are (48.0 $\pm$ 2.7)$\%$ and (47.9 $\pm$ 3.3)$\%$ of the observed total $β$ transition intensities of (78.2 $\pm$ 2.5)$\%$ and (82.2 $\pm$ 3.7)$\%$, respectively. Notably, the half-lives decrease in accordance with the upper limits of (48.0 $\pm$ 6.0)$\%$ [3.67(20) s $\rightarrow$ 1.91(3) s] and (47.9 $\pm$ 7.2)$\%$ [3.01(19) s $\rightarrow$ 1.57(1) s] for $^{80g}$Ga and $^{80m}$Ga, respectively, when including first-forbidden transitions, in contrast to those by Gamow-Teller transitions only. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_02156 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $β$-delayed spectroscopy of $^{80}$Ge$_{48}$ and competition between Gamow-Teller and first-forbidden transitions in $^{80g+m}$Ga$_{49}$ $β$ decay Li, R. Matea, D. Verney I. Harakeh, M. N. Delafosse, C. Didierjean, F. Ebata, S. Ayoubi, L. A. Falou, H. Al Benzoni, G. Blanc, F. Le Bozkurt, V. Ciemała, M. Deloncle, I. Fallot, M. Gaulard, C. Gottardo, A. Guadilla, V. Guillot, J. Hadyńska-Klęk, K. Ibrahim, F. Jovancevic, N. Kankainen, A. Lebois, M. Martínez, T. Napiorkowski, P. Roussiere, B. Sobolev, Yu. G. Stefan, I. Stukalov, S. Thisse, D. Tocabens, G. Nuclear Experiment The $β$-delayed spectroscopy of $^{80}$Ge has been studied using sources of ground and low-lying isomeric states of $^{80}$Ga. A hybrid $γ$-ray spectrometer was used, composed of high-purity germanium (HPGe) detectors for low-energy $γ$-ray detection, phoswich detectors from the PARIS array for high-energy $γ$ rays and a plastic detector for $β$ tagging. The new decay level schemes are presented, with 13 and 14 states $β$ populated by $^{80g}$Ga and $^{80m}$Ga, respectively, being reported for the first time. We quantitatively compare summed intensities of first-forbidden and previously reported Gamow-Teller $β$ transitions [R. Li et al., \href{https://doi.org/10.1103/PhysRevC.111.034303}{Phys. Rev. C 111, 034303 (2025)}]. The upper-limit fractions of first-forbidden transitions contributing to the decays of $^{80g}$Ga and $^{80m}$Ga are (48.0 $\pm$ 2.7)$\%$ and (47.9 $\pm$ 3.3)$\%$ of the observed total $β$ transition intensities of (78.2 $\pm$ 2.5)$\%$ and (82.2 $\pm$ 3.7)$\%$, respectively. Notably, the half-lives decrease in accordance with the upper limits of (48.0 $\pm$ 6.0)$\%$ [3.67(20) s $\rightarrow$ 1.91(3) s] and (47.9 $\pm$ 7.2)$\%$ [3.01(19) s $\rightarrow$ 1.57(1) s] for $^{80g}$Ga and $^{80m}$Ga, respectively, when including first-forbidden transitions, in contrast to those by Gamow-Teller transitions only. |
| title | $β$-delayed spectroscopy of $^{80}$Ge$_{48}$ and competition between Gamow-Teller and first-forbidden transitions in $^{80g+m}$Ga$_{49}$ $β$ decay |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2504.02156 |