Elsevier

Nuclear Physics A

Volume 523, Issue 2, 11 February 1991, Pages 426-452
Nuclear Physics A

Multi-quasi-particle states in 173Hf

https://doi.org/10.1016/0375-9474(91)90011-TGet rights and content

Abstract

Rotational bands built on 1, 3 and 5 quasi-particle (qp) states in 173Hf have been populated to medium and high spins through the 160Gd(18O, 5n) reaction. The 1qp bands, previously identified as the 12[521], 52[512] and 72+[633] (mixed i132) Nilsson configurations, have the first back-bend and show different alignment properties, possibly originating from deformation differences. The multi-particle states were identified from excitation energies, the properties of their associated band structures and decay patterns. The 3qp states are the previously known Kπ = 192+ and 232 isomeric states originating from the 72+[633] quasi-neutron coupled to 8, 2-quasi-proton excitations and a Kπ=(132+) state possibly containing the three lowest quasi-neutrons. A 5qp state with Kπ = (292) was identified as the same three lowest lying quasi-neutrons coupled to the 8, 2-quasi-proton excitation. The low excitation energies of these two related 3-and 5-quasi-particle states implies a reduced neutron pairing gap, which can be attributed to the effect of blocking.

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    National Research Fellow, Permanent Address: Institute of Nuclear Research of the Hungarian Academy of Science, Pf 51, Debrecen, H-4001 Hungary.

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