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Two-hole structure outside Ni 78: Existence of a μ s isomer of Co 76 and β decay into Ni 76

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Title
Two-hole structure outside Ni 78: Existence of a μ s isomer of Co 76 and β decay into Ni 76
Author(s)
Söderström, P.-A.; Nishimura, S.; Xu, Z.Y.; Sieja, K.; Werner, V.; Doornenbal, P.; Lorusso, G.; Browne, F.; Gey, G.; Jung, H.S.; Sumikama, T.; Taprogge, J.; Vajta, Z.; Watanabe, H.; Wu, J.; Baba, H.; Dombradi, Z.; Franchoo, S.; Isobe, T.; John, P.R.; Y. -K. Kim; Kojouharov, I.; Kurz, N.; Y. K. Kwon; Li, Z.; Matea, I.; Matsui, K.; Martínez-Pinedo, G.; Mengoni, D.; Morfouace, P.; Napoli, D.R.; Niikura, M.; Nishibata, H.; Odahara, A.; Ogawa, K.; Pietralla, N.; Şahin, E.; Sakurai, H.; Schaffner, H.; Sohler, D.; Stefan, I.G.; Suzuki, D.; Taniuchi, R.; Yagi, A.; Yoshinaga, K.
Publication Date
2015-11
Journal
PHYSICAL REVIEW C, v.92, no.5, pp.051305-1 - 051305-5
Publisher
AMER PHYSICAL SOC
Abstract
In the EURICA campaign aimed at exploration of the Ni78 region, an isomeric state of Co76 has been observed via γ-ray spectroscopy. The nuclei were produced by in-flight fission of a U238 beam at the Radioactive Isotope-Beam Factory. Two coincident γ rays of 192.02(30) and 446.4(7) keV from the decay of a t1/2=2.96(2529)μs isomeric state of Co76 have been observed. The decay of the isomer was assigned to an E1 transition with a reduced transition probability of B(E1;3+→2-)=1.79(16)×10-8 W.u. A β-decaying state with spin-parity 1- and a half-life of 16(4) ms was also observed in the data, and the known state with a half-life of 22(57) ms was assigned to have a spin-parity of 8-. Furthermore, the isomer of Ni76 has been remeasured to 547.8(33) ns giving a B(E2;8+→6+) value of 0.786(5) W.u. A new excited state at 2994.6(5) keV, decaying via a γ ray of 2004.5(4) keV, has also been observed. This is in agreement with either of the predicted 02+ or 22+ states. These results are discussed in terms of the shell model and the interaction of the νp1/2 and πf7/2 orbitals. © 2015 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/2910
DOI
10.1103/PhysRevC.92.051305
ISSN
0556-2813
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