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In-beam and alpha-decay spectroscopy of Po-191 and evidence for triple shape coexistence at low energy in the daughter nucleus Pb-187
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2002 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 66, no 1Article in journal (Refereed) Published
Abstract [en]

Prompt gamma rays have been observed for the first time from the neutron-deficient nucleus Po-191 using the recoil-decay tagging technique at the RITU gas-filled separator. In addition improved alpha decay data have been measured for Po-191 and its daughter product Pb-187. The complementary gamma- and alpha-decay data point to the onset of oblate deformation in the light odd-mass Po nuclei by approaching the neutron midshell at N=104. The pattern of the favored and unfavored states observed on top of the 13/2(+) isomer in Po-191 indicates a change from the weak-coupling towards the strong-coupling scheme in Po-191m. In the daughter nucleus Pb-187, the 13/2(+) and 3/2(-) isomeric states become degenerate within the experimental accuracy. Evidence for triple shape coexistence at low energy has been found in the high-spin isomer in Pb-187. The results are supported by potential-energy surface calculations and by particle-plus-rotor calculations.

Place, publisher, year, edition, pages
2002. Vol. 66, no 1
Keyword [en]
gamma-ray spectroscopy, light po isotopes, polonium isotopes, platinum isotopes, intruder states, excited-states, capture decay, neutron, identification, deformation
URN: urn:nbn:se:kth:diva-21834DOI: 10.1103/PhysRevC.66.014313ISI: 000177529700025OAI: diva2:340532
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Wyss, Ramon
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