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

Title
Two-hole structure outside Ni-78: Existence of a mu s isomer of Co-76 and beta decay into Ni-76
Author
김용균
Issue Date
2015-11
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW C, v. 92, NO 5, Page. 1-5
Abstract
In the EURICA campaign aimed at exploration of the Ni-78 region, an isomeric state of Co-76 has been observed via gamma-ray spectroscopy. The nuclei were produced by in-flight fission of a U-238 beam at the Radioactive Isotope-Beam Factory. Two coincident gamma rays of 192.02(30) and 446.4(7) keV from the decay of a t(1/2) = 2.96((29)(25)) mu s isomeric state of Co-76 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) x 10(-8) W.u. A beta-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((7)(5)) ms was assigned to have a spin-parity of 8(-). Furthermore, the isomer of Ni-76 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 gamma ray of 2004.5(4) keV, has also been observed. This is in agreement with either of the predicted 0(2)(+) or 2(2)(+) states. These results are discussed in terms of the shell model and the interaction of the nu p(1/2) and pi f(7/2) orbitals.
URI
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.92.051305http://hdl.handle.net/20.500.11754/28731
ISSN
0556-2813; 1089-490X
DOI
10.1103/PhysRevC.92.051305
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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