CERN Accelerating science

Article
Report number arXiv:0808.0790
Title Nuclear structure of $^{231}$Ac
Author(s) Boutami, R. (Madrid, Inst. Estructura Materia) ; Borge, M.J.G. (Madrid, Inst. Estructura Materia) ; Mach, H. (Uppsala U.) ; Kurcewicz, W. (Warsaw U.) ; Fraile, L.M. (Madrid U. ; CERN) ; Gulda, K. (Warsaw U.) ; Aas, A.J. (Oslo U.) ; Garcia-Raffi, L.M. (Valencia U., IFIC) ; Lovhoiden, G. (Oslo U.) ; Martinez, T. (Valencia U., IFIC) ; Rubio, B. (Valencia U., IFIC) ; Tain, J.L. (Valencia U., IFIC) ; Tengblad, O. (Madrid, Inst. Estructura Materia ; CERN)
Publication 2008
Imprint 07 Aug 2008
Number of pages 47
In: Nucl. Phys. A 811 (2008) 244-275
DOI 10.1016/j.nuclphysa.2008.08.005
Subject category Nuclear Physics - Experiment
Abstract 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.
Copyright/License Elsevier B.V.



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