First spectroscopic study of odd-odd Cu 78

Journal Article · Mon Apr 03 00:00:00 EDT 2023 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.107.044301· OSTI ID:2419374

Pedersen, L. G. ^[1]; Sahin, E.; Görgen, A.; Bello Garrote, F. L.; Tsunoda, Y.; Otsuka, T.; Niikura, M.; Nishimura, S.; Xu, Z.; Baba, H.; Benzoni, G.; Browne, F.; Bruce, A. M.; Ceruti, S.; Crespi, F. L.; Daido, R.; de Angelis, G.; Delattre, M. -C.; Dombradi, Zs; Doornenbal, P. ; Fang, Y.; Franchoo, S.; Gey, G.; Gottardo, A.; Isobe, T.; John, P. R.; Jung, H. S.; Kojouharov, I.; Kubo, T.; Kurz, N.; Kuti, I.; Li, Z.; Lorusso, G.; Matea, I.; Matsui, K.; Mengoni, D.; Miyazaki, T.; Modamio, V.; Momiyama, S.; Morales, A. I.; Morfouace, P.; Napoli, D. R.; Naqvi, F.; Nishibata, H.; Odahara, A.; Orlandi, R.; Patel, Z.; Rice, S.; Sakurai, H.; Schaffner, H.; Sinclair, L.; Söderström, P. -A.; Sohler, D.; Stefan, I. G.; Sumikama, T.; Suzuki, D.; Taniuchi, R.; Taprogge, J.; Vajta, Z.; Valiente-Dobón, J. J.; Watanabe, H.; Werner, V.; Wu, J.; Yagi, A.; Yalcinkaya, M.; Yokoyama, R.; Yoshinaga, K.

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1. Univ. of Oslo (Norway); et al.; OSTI

Nuclei in the vicinity of ⁷⁸Ni are important benchmarks for nuclear structure, which can reveal changes in the shell structure far from stability. Spectroscopy of the odd-odd isotope ⁷⁸CU was performed for the first time in an experiment with the EURICA setup at the Radioactive Isotope Beam Factory at RIKEN Nishina Center. Excited states in the neutron-rich isotope were populated following the β decay of ⁷⁸Ni produced by in-flight fission and separated by the BigRIPS separator. A level scheme based on the analysis of $$\gamma$$-$$\gamma$$ coincidences is presented. Tentative spin and parity assignments were made when possible based on the β-decay feeding intensities and $$\gamma$$-decay properties of the excited states. Time correlations between β and $$\gamma$$ decay show clear indications of an isomeric state with a half-life of 3.8(4) ms. Large-scale Monte Carlo shell-model calculations were performed using the A3DA-m interaction and a valence space comprising the full f p shell and the 1⁢g_9/2 and 2⁢d_5/2 orbitals for both protons and neutrons. The comparison of the experimental results with the shell-model calculations allows interpreting the excited states in terms of spin multiplets arising from the proton-neutron interaction. In conclusion, the results provide further insight into the evolution of the proton single-particle orbitals as a function of neutron number, and quantitative information about the proton-neutron interaction outside the doubly magic ⁷⁸Ni core.

• Research Organization: Yale Univ., New Haven, CT (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: FG02-91ER40609
• OSTI ID: 2419374
• Journal Information: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 4 Vol. 107; ISSN 2469-9985
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS