Koiwai, T., Wimmer, K., Doornenbal, P. et al. (80 more authors) (2022) A first glimpse at the shell structure beyond 54Ca:Spectroscopy of 55K, 55Ca, and 57Ca. Physics Letters B. 136953. ISSN 0370-2693
Abstract
States in the $N=35$ and 37 isotopes $^{55,57}$Ca have been populated by direct proton-induced nucleon removal reactions from $^{56,58}$Sc and $^{56}$Ca beams at the RIBF. In addition, the $(p,2p)$ quasi-free single-proton removal reaction from $^{56}$Ca was studied. Excited states in $^{55}$K, $^{55}$Ca, and $^{57}$Ca were established for the first time via in-beam $\gamma$-ray spectroscopy. Results for the proton and neutron removal reactions from $^{56}$Ca to states in $^{55}$K and $^{55}$Ca for the level energies, excited state lifetimes, and exclusive cross sections agree well with state-of-the-art theoretical calculations using different approaches. The observation of a short-lived state in $^{57}$Ca suggests a transition in the calcium isotopic chain from single-particle dominated states at $N=35$ to collective excitations at $N=37$.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 The Author(s) |
Keywords: | nucl-ex |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 21 Jul 2023 09:10 |
Last Modified: | 16 Oct 2024 19:19 |
Published Version: | https://doi.org/10.1016/j.physletb.2022.136953 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1016/j.physletb.2022.136953 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:201756 |
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Description: A first glimpse at the shell structure beyond 54Ca: Spectroscopy of 55K, 55Ca, and 57Ca
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