Nuclear structure of Ac-231

Details Nuclear structure of Ac-231 Nuclear structure of Ac-231

2008-08-06

arxiv.org/abs/0808.0790v1

Nucl.Phys.A811:244-275,2008

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1016/j.nuclphysa.2008.08.005

The low-energy structure of 231Ac has been investigated by means of gamma ray spectroscopy following the beta-decay of 231Ra. Multipolarities of 28 transitions have been established by measuring conversion electrons with a mini-orange electron spectrometer. The decay scheme of 231Ra --> 231Ac has been constructed for the first time. The Advanced Time Delayed beta-gamma-gamma(t) method has been used to measure the half-lives of five levels. The moderately fast B(E1) transition rates derived suggest that the octupole effects, albeit weak, are still present in this exotic nucleus.

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