Elsevier

Nuclear Physics A

Volume 555, Issue 2, 12 April 1993, Pages 435-454
Nuclear Physics A

The study of the odd-proton nucleus 169Ta at high spin

https://doi.org/10.1016/0375-9474(93)90295-9Get rights and content

Abstract

The level structure of 169Ta has been studied using the reactions 155Gd(19F,5n), E = 85.5–100 MeV and 122Sn(51V,4n), E = 223 MeV. Four rotational bands of 169Ta have been identified with assignments 12[541], 92[514], 52+[402], 12+[411] and a decoupled band was identified but not assigned to any configuration. Different configurations are observed to have different band-crossing frequencies and these differences are consistent with configuration-dependent deformation driving effects. The crossing frequency of the band based on the 12[541] configuration is deduced to be 0.305MeV/ħ which is delayed by about 55 keV in comparison with the yrast bands of its even neighbours. The first band crossings of 169Ta are attributed to the alignment of a pair of i132 quasineutrons, while the second band crossings may correspond to h112 two-quasiproton alignment. The deformation driving effects of quasiparticle orbitais, B(M1)/B(E2) values of the 92[514] and 52+[402] bands and the band crossings in 169Ta are discussed.

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    1

    Present address: NNC Ltd, Booths Hall, Chelford Road, Knutsford WA16 8QZ, UK.

    2

    Present address: Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA.

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