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Atomic nuclei within an isobaric multiplet have rather similar structure, and studying $\ensuremath{\beta}$ decay between these nuclei is a powerful spectroscopy tool. An international team of researchers reports on a large amount of nuclear structure data for several nuclei near the proton dripline: ${}^{64}$Se, its isobar multiplet neighbor ${}^{64}$As, and ${}^{63}$Ge. ${}^{64}$Se is the heaviest ${T}_{z}=\ensuremath{-}2$ nucleus that both $\ensuremath{\beta}$ decays and has a stable mirror partner ${T}_{z}=+2$. The experiment used fragmentation from a high-intensity ${}^{78}$Kr beam at the RIKEN Nishina Center in Japan and recorded in addition to $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$ rays also decay protons from states above the separation energy. The comprehensive spectroscopy led to new insights on the isobaric mass multiplet equation for the $A=64$ $T=2$ system, the heaviest multiplet where these studies are possible, and found good mirror symmetry. In also measuring the half-life of ${}^{64}$Se and revisiting the idea of the anti-analog state originally discussed for the $A=56$ system half a century ago, the work brings detailed nuclear decay studies very close to the proton drip line.

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Publication Details

Journal
Physical review. C
Published
2025-09-24
DOI
https://doi.org/10.1103/gkvv-y4w8
Primary Topic
Nuclear physics research studies
Type
article
Field-Weighted Citation Impact
0.00
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article

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S. Nishimura, D. Nishimura, F. Diel, P. Aguilera et al.
Physical review. C
Nuclear physics research studies
article

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S. Nishimura, D. Nishimura, F. Diel, P. Aguilera, S. Go, P. Ascher, S. M. Lenzi, S. Kubono, A. Algora, E. Ganioğlu, F. Molina, W. Gelletly, Hugo F. Arellano, Y. Fujita, A. I. Morales, A. Montaner-Pizá, T. Kurtukian‐Nieto, D. S. Ahn, Β. Blank, R. Burcu ÇAKIRLI MUTLU, M. Gerbaux, S. E. A. Orrigo, G. de France, T. Goigoux, C. Borcea, B. Rubio, V. Guadilla, Y. Takei, S. Grévy, T. Sumikama, N. Inabe, M. Tanaka, J. Agramunt, C. Magron, T. Kubo, D. Lubos, D. R. Napoli, J. Giovinazzo, P.-A. Söderström, P. Doornenbal, V. H. Phong, H. Suzuki, A. Boso, G. de Angelis, Hiroyuki Oikawa, G. Kiss, N. Fukuda, H. Takeda, Y. Shimizu, J. Wu, S. Yagi, J. Chiba
article en

Abstract

Atomic nuclei within an isobaric multiplet have rather similar structure, and studying $\ensuremath{\beta}$ decay between these nuclei is a powerful spectroscopy tool. An international team of researchers reports on a large amount of nuclear structure data for several nuclei near the proton dripline: ${}^{64}$Se, its isobar multiplet neighbor ${}^{64}$As, and ${}^{63}$Ge. ${}^{64}$Se is the heaviest ${T}_{z}=\ensuremath{-}2$ nucleus that both $\ensuremath{\beta}$ decays and has a stable mirror partner ${T}_{z}=+2$. The experiment used fragmentation from a high-intensity ${}^{78}$Kr beam at the RIKEN Nishina Center in Japan and recorded in addition to $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$ rays also decay protons from states above the separation energy. The comprehensive spectroscopy led to new insights on the isobaric mass multiplet equation for the $A=64$ $T=2$ system, the heaviest multiplet where these studies are possible, and found good mirror symmetry. In also measuring the half-life of ${}^{64}$Se and revisiting the idea of the anti-analog state originally discussed for the $A=56$ system half a century ago, the work brings detailed nuclear decay studies very close to the proton drip line.

Physical review. CVol. 112(5)
University of Padua (IT), Universidad Andrés Bello (CL), Université de Bordeaux (FR), Istituto Nazionale di Fisica Nucleare (IT), Tokyo University of Science (JP), GSI Helmholtz Centre for Heavy Ion Research (DE), University of Cologne (DE), Tokyo City University (JP), HUN-REN Institute for Nuclear Research (HU), Millennium Institute (BR), University of Surrey (GB), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), Instituto de Física Corpuscular (ES), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro (IT), Laboratoire de Physique des deux infinis Bordeaux (FR), Comisión Chilena de Energía Nuclear (CL), Institute for Physics (US), Extreme Light Infrastructure - Nuclear Physics (RO), Grand Accélérateur National d'Ions Lourds (FR), Max Planck Institute for Nuclear Physics (DE), RIKEN Nishina Center (JP), Institut für Technische und Angewandte Physik (Germany) (DE), Centre Émile Durkheim (FR), University of Warsaw (PL), Technical University of Munich (DE), Istanbul University (TR), VNU University of Science (VN), University of Chile (CL), University of Tennessee at Knoxville (US), The University of Osaka (JP)
Openalex Percentile: Top 84%
Nuclear physics research studies
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