Hauschild K, Rejmund M, Grawe H, Caurier E, Nowacki F, Becker F, Le Coz Y, Korten W, Döring J, Górska M, Schmidt K, Dorvaux O, Helariutta K, Jones P, Julin R, Juutinen S, Kettunen H, Leino M, Muikku M, Nieminen P, Rahkila P, Uusitalo J, Azaiez F, Belleguic M. Isomer spectroscopy in (216)(90)Th(126) and the magicity of (218)(92)U(126).
Phys Rev Lett 2001;
87:072501. [PMID:
11497885 DOI:
10.1103/physrevlett.87.072501]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2001] [Indexed: 05/23/2023]
Abstract
Excited states in (216)Th were investigated via prompt and delayed gamma decays and the recoil-decay tagging method. The decay schemes of the I(pi) = (8+), t(1/2) = 128(8) micros, the I(pi) = (11-), t(1/2) = 615(55) ns, and the I(pi) = (14+), t(1/2) > or = 130 ns isomers were established. The configuration pi h(9/2)f(7/2) is assigned to the I(pi) = (8+) isomer, which implies that the h(9/2) and f(7/2) states are nearly degenerate. This is ascribed to increased binding of the f(7/2) orbital by its coupling to a low-lying I(pi) = (3-) state at E(x) = 1687 keV. The role of octupole and pairing correlations for a Z = 92 shell closure prediction is discussed on the basis of shell model calculations.
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