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| Format: | Preprint |
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2024
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| Online-Zugang: | https://arxiv.org/abs/2412.05404 |
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| author | Beck, T. Gade, A. Brown, B. A. Utsuno, Y. Weisshaar, D. Bazin, D. Brown, K. W. Charity, R. J. Farris, P. J. Gillespie, S. A. Hill, A. M. Li, J. Longfellow, B. Reviol, W. Rhodes, D. |
| author_facet | Beck, T. Gade, A. Brown, B. A. Utsuno, Y. Weisshaar, D. Bazin, D. Brown, K. W. Charity, R. J. Farris, P. J. Gillespie, S. A. Hill, A. M. Li, J. Longfellow, B. Reviol, W. Rhodes, D. |
| contents | High-resolution in-beam $γ$-ray spectroscopy was used to study excited states of the neutron-deficient nucleus $^{32}$Ar populated in fast-beam induced four- and six-nucleon removal reactions from $^{36,38}$Ca. One new $γ$-ray transition and indications for an additional two were found, allowing for a glimpse at the level scheme beyond the known $2^+_1$ state. The nature of the new $1900(4)$-keV transition is discussed in the context of the known energy spectrum of the mirror nucleus $^{32}$Si and shell-model calculations using the FSU and SDPF-M cross-shell effective interactions. Its resulting parent state at $3767(5)$ keV, more than $1.3$ MeV above the proton separation energy, is tentatively assigned to have mixed sd-shell and $2p$-$2h$ character. It might either be the mirror of the $J^π=2^+_2$ state of $^{32}$Si at $4230.8(8)$ keV, but with a decay branch favoring a transition to the $2^+_1$ over the ground state, or the mirror of the $4983.9(11)$-keV state with quantum numbers $0^+$. The resulting mirror-energy differences of $-473(5)$ and $-1218(5)$ keV are both sizable when compared to systematics; in the latter case it would, in fact, be among the largest reported to date in the entire nuclear chart or suggest the potential existence of an additional, hitherto unidentified, low-lying $0^+$ state of $^{32}$Si. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_05404 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | In-beam $γ$-ray spectroscopy towards the proton dripline: The curious case of $^{32}$Ar Beck, T. Gade, A. Brown, B. A. Utsuno, Y. Weisshaar, D. Bazin, D. Brown, K. W. Charity, R. J. Farris, P. J. Gillespie, S. A. Hill, A. M. Li, J. Longfellow, B. Reviol, W. Rhodes, D. Nuclear Experiment High-resolution in-beam $γ$-ray spectroscopy was used to study excited states of the neutron-deficient nucleus $^{32}$Ar populated in fast-beam induced four- and six-nucleon removal reactions from $^{36,38}$Ca. One new $γ$-ray transition and indications for an additional two were found, allowing for a glimpse at the level scheme beyond the known $2^+_1$ state. The nature of the new $1900(4)$-keV transition is discussed in the context of the known energy spectrum of the mirror nucleus $^{32}$Si and shell-model calculations using the FSU and SDPF-M cross-shell effective interactions. Its resulting parent state at $3767(5)$ keV, more than $1.3$ MeV above the proton separation energy, is tentatively assigned to have mixed sd-shell and $2p$-$2h$ character. It might either be the mirror of the $J^π=2^+_2$ state of $^{32}$Si at $4230.8(8)$ keV, but with a decay branch favoring a transition to the $2^+_1$ over the ground state, or the mirror of the $4983.9(11)$-keV state with quantum numbers $0^+$. The resulting mirror-energy differences of $-473(5)$ and $-1218(5)$ keV are both sizable when compared to systematics; in the latter case it would, in fact, be among the largest reported to date in the entire nuclear chart or suggest the potential existence of an additional, hitherto unidentified, low-lying $0^+$ state of $^{32}$Si. |
| title | In-beam $γ$-ray spectroscopy towards the proton dripline: The curious case of $^{32}$Ar |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2412.05404 |