Isomer spectroscopy in (216)(90)Th(126) and the magicity of (218)(92)U(126).
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.
Hauschild
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DAPNIA/SPhN CEA Saclay, F-91191 Gif-sur-Yvette, France.
Rejmund
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Grawe
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Caurier
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Nowacki
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Becker
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Le Coz
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Korten
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Döring
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Górska
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Schmidt
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Dorvaux
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Helariutta
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Jones
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Julin
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Juutinen
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Kettunen
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Leino
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Muikku
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Nieminen
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Rahkila
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Uusitalo
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Azaiez
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Belleguic
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