Elsevier

Nuclear Physics A

Volume 289, Issue 1, 10 October 1977, Pages 165-186
Nuclear Physics A

Electromagnetic properties of the ground state rotational band in 169Tm

https://doi.org/10.1016/0375-9474(77)90527-9Get rights and content

Abstract

Beams of 32S ions at energies up to 140 MeV have been used to excite the ground state band of 169Tm (Kπ = 12+) as high as its spin232 member by multiple Coulomb excitation. Lifetimes for levels from spin 92 to spin 212 have been determined by the recoil distance and Doppler broadened lineshape methods. Branching and multipole mixing ratios were deduced from the measured γ-ray angular correlations. From these data it has been possible to extract, without reference to the rotational model, many of the B(E2) and B(M1) values connecting the band members. The agreement with the rotational model is exceptionally good for all the measured quantities. The inclusion of a K = 32 mixing into the ground state band improves the fit to the energies to the detriment of the fit to the B(M1) values at high spin.

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