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2021ES05      Phys.Rev. C 103, 064328 (2021)

S.Escrig, A.I.Morales, S.Nishimura, M.Niikura, A.Poves, Z.Y.Xu, G.Lorusso, F.Browne, P.Doornenbal, G.Gey, H.-S.Jung, Z.Li, P.-A.Soderstrom, T.Sumikama, J.Taprogge, Zs.Vajta, H.Watanabe, J.Wu, A.Yagi, K.Yoshinaga, H.Baba, S.Franchoo, T.Isobe, P.R.John, I.Kojouharov, S.Kubono, N.Kurz, I.Matea, K.Matsui, D.Mengoni, P.Morfouace, D.R.Napoli, F.Naqvi, H.Nishibata, A.Odahara, E.Sahin, H.Sakurai, H.Schaffner, I.G.Stefan, D.Suzuki, R.Taniuchi, V.Werner, D.Sohler

Persistence of the Z=28 shell gap in A=75 isobars: Identification of a possible (1/2^-)μs isomer in ⁷⁵Co and β decay to ⁷⁵Ni

RADIOACTIVITY ^75mCo(IT); ⁷⁵Co(β^-), (β^-n)[from in-flight fission in ⁹Be(²³⁸U, F), E=345 MeV/nucleon, followed by separation of fragments of interest using BigRIPS separator and ZeroDegree spectrometer (ZDS) at RIBF-RIKEN facility]; measured Eγ, Iγ, βγ- and βγγ-coin, half-life of ^75mCo decay by (ion)γ(t) using active beam stopper WAS3ABi with double-sided silicon strips detectors (DSSSDs) for fragment and β detection and EURICA array of 12 clusters HPGe detectors for γ rays. ^74,75Ni; deduced levels, J, π, multipolarities of two transitions, configurations, β feedings, β^-n feedings, logft values. ⁷⁵Co; deduced lower limit of %β^-n. ^75mCo; deduced isomer, energy, J, π, transition multipolarity and half-life of the micro-sec isomer. Comparison with the large-scale shell-model calculations using PFSDG-U interaction in the pf-sdg space. Systematics of low-lying levels in ^69,71,73,75Co.

doi: 10.1103/PhysRevC.103.064328
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