Shell structure effects on the high-spin rotational states in ytterbium nuclei (populated in160Gd(14C, 4n)107Yb reaction)
- 1 May 1973
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 6 (5) , L60-L65
- https://doi.org/10.1088/0305-4470/6/5/003
Abstract
The ground state rotational band members up to spin 18+ have been identified in 170Yb(N=100) by studying the gamma rays from the 160Gd(14C, 4n) 170Yb reaction. The nuclear moment of inertia of the band shows an abrupt increase at high-spin values similar to that observed in nuclei with N=90-96, but in contrast with the smooth increase in the N=98 nucleus 168Yb. This dependence on neutron number is difficult to explain in terms of the decoupling of neutrons in the i13/2 orbital alone, but is consistent with the Coriolis antipairing description of a phase transition from a superfluid to a normal state if account is taken of the reduction in pairing correlations caused by the shell structure peculiar to 168Yb.Keywords
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