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Journal Articles Physical Review C Year : 1997

Shell model level structure of $^{216}$Fr

Abstract

Sources of 220Ac in secular equilibrium with 221Pa were produced using the reaction 209Bi(18O,3n)224Pa. The alpha decay of 220Ac and coincident gamma and electron spectra were used to study the level structure of 216Fr. The levels in 216Fr can be interpreted in terms of the π(h9/2)9/25ν(g9/2)9/23, π(h9/2)04(f7/2)7/2ν(g9/2)9/23, and π(h9/2)9/25ν(g9/2)02(i11/2)11/2 shell model configurations. The alpha decay hindrance factors of the ground state to ground state transitions in the sequence 224Pa→220Ac→216Fr→212At suggest the collapse of quadrupole-octupole Nilsson orbitals into the more degenerate shell model orbitals. The sequence of hindrance factors in this odd chain are mirrored in the corresponding odd proton and odd neutron sequences beginning with 223Pa and 223Th, respectively. (APS)
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Dates and versions

in2p3-00012986 , version 1 (24-02-1999)

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R.K. Sheline, C.F. Liang, P. Paris, A. Gizon. Shell model level structure of $^{216}$Fr. Physical Review C, 1997, 55, pp.1162-1168. ⟨10.1103/PhysRevC.55.1162⟩. ⟨in2p3-00012986⟩
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