Elsevier

Nuclear Physics A

Volume 641, Issue 4, 26 October 1998, Pages 401-429
Nuclear Physics A

Spectroscopy of 215Ra: the shell model and enhanced E3 transitions

https://doi.org/10.1016/S0375-9474(98)00484-9Get rights and content

Abstract

Excited states in the N = 127 nucleus 215Ra have been studied using γ-ray and electron spectroscopy following reactions of 13C on 206Pb targets. Levels were identified up to spins of 612h and excitation energies of ∼ 6 MeV. Enhanced octupole transitions are a feature of the level scheme. Lifetimes and magnetic moments were measured for several isomeric levels. The level scheme, transition rates and magnetic moments are compared with empirical shell model calculations and multiparticle octupole-coupled shell model calculations. In general, the experimental data are well described, but in comparison with its success in describing enhanced E3 transitions between related states in the radon isotopes, some limitations of the multiparticle octupole-coupling approach are revealed in 215Ra.

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    1

    Present address: Danmarks Miljøundersøgelser, Frederiksborgvej 399, P.O. Box 358, DK4000 Roskilde, Denmark.

    2

    Present address: Nuclear Science Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720 USA.

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