Elsevier

Nuclear Physics A

Volume 630, Issues 3–4, 23 February 1998, Pages 603-630
Nuclear Physics A

Band structures and proton-neutron interactions in 174Ta

https://doi.org/10.1016/S0375-9474(97)00650-7Get rights and content

Abstract

Six rotational bands in the odd-odd nucleus 174Ta have been populated with the 160Gd(19F,5n) reaction. High-spin states were identified using the NORDBALL array. Both signatures of the doubly decoupled π12 [541] ⊗ ν12 [521] band and semi-decoupled π12 [541] ⊗ ν72 [633] band are observed, in addition to the high-K couplings of the π92 [514] ⊗ ν72+ [633], π92 [514] ⊗ ν52 [512], π72+ [404] ⊗ ν72+ [633], and π52+ [402] ⊗ ν52 [512] configurations. The signature splitting of the π12 [541] ⊗ ν72+ [633] band is inverted from the expected splitting, and this is interpreted as being due to a residual proton-neutron interaction. It is shown empirically that this interaction, together with deformation changes, can account for the increased crossing frequency associated with the alignment of i132 neutrons in the π12 [541] bands of odd-Z nuclei.

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    1

    Present address: Schuster Laboratory, University of Manchester, UK.

    2

    Present address: Department of Physics, Åbo Akademi, Finland.

    3

    Present Address: Department of Physics, University of Jyväskylä, Finland.

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