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Shell model plus cluster description of negative parity states in Po-212
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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2012 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 85, no 6, 064306- p.Article in journal (Refereed) Published
Abstract [en]

The intraband electromagnetic transitions in Po-210 and Pb-210 are well described within the shell model approach. In contrast, similar transitions in Po-212 are one order ofmagnitude smaller than the experimental values, suggesting the existence of an alpha-cluster component in the structure of this nucleus. To probe this assumption we introduced Gaussian-like components in the single-particle orbitals. We thus obtained an enhancement of intraband transitions, as well as a proper description of the absolute alpha-decay width in Po-212. We analyzed the recently measured unnatural parity states I- in Po-212 in terms of the collective octupole excitation in Pb-208 coupled to positive parity states in Pb-210. They are connected by relatively large dipole transitions to yrast positive natural parity states. We described E1 transitions by using the same alpha-cluster component and an effective neutron dipole charge e(nu) = -eZ/A. B(E2) values and absolute alpha-decay width in Po-212 are simultaneously described within the shell model plus a cluster component depending upon one free strength parameter.

Place, publisher, year, edition, pages
2012. Vol. 85, no 6, 064306- p.
Keyword [en]
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Physical Sciences
URN: urn:nbn:se:kth:diva-98716DOI: 10.1103/PhysRevC.85.064306ISI: 000304937400001ScopusID: 2-s2.0-84862872406OAI: diva2:539300
QC 20120703Available from: 2012-07-03 Created: 2012-07-02 Last updated: 2012-07-03Bibliographically approved

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Liotta, Roberto
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