Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.242502
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Funding
- Research Council of Norway [240104, 213442]
- KAKENHI [25247045, 23.01752, 25800130]
- U.S. DOE [DE-FG02-91ER-40609]
- Spanish Ministerio de Ciencia e Innovacin [FPA2009-13377C02, FPA2011-29854-C04]
- Hungarian Scientific Research Fund OTKA [K100835]
- HPCI (The Origin of Matter and the Universe)
- Priority Issue on Post-K computer (Elucidation of the Fundamental Laws and Evolution of the Universe) [hp160211]
- CNS-RIKEN
- EUROBALL Owners Committee
- Rare Isotope Science Project
- Ministry of Education, Science and Technology (MEST)
- National Research Foundation (NRF) of Korea
- Grants-in-Aid for Scientific Research [16J05919, 25800130, 16F16323] Funding Source: KAKEN
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The level structure of the neutron-rich Cu-77 nucleus is investigated through beta-delayed gamma-ray spectroscopy at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. Ions of Ni-77 are produced by inflight fission, separated and identified in the BigRIPS fragment separator, and implanted in the WAS3ABi silicon detector array, surrounded by Ge cluster detectors of the EURICA array. A large number of excited states in Cu-77 are identified for the first time by correlating gamma rays with the beta decay of Ni-77, and a level scheme is constructed by utilizing their coincidence relationships. The good agreement between large-scale Monte Carlo shell model calculations and experimental results allows for the evaluation of the single-particle structure near Ni-78 and suggests a single-particle nature for both the 5/2(1)(-) and 3/2(1)(-) states in Cu-77, leading to doubly magic Ni-78.
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