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Title: In-beam and alpha-decay spectroscopy of Po-191 and evidence for triple shape coexistence at low energy in the daughter nucleus Pb-187
Authors: Andreyev, Andrei
Huyse, Marc
Van de Vel, Karen
Van Duppen, Piet
Dorvaux, O
Greenlees, P
Helariutta, K
Jones, P
Julin, R
Juutinen, S
Kettunen, H
Kuusiniemi, P
Leino, M
Muikku, M
Nieminen, P
Rahkila, P
Uusitalo, J
Wyss, R
Hauschild, K
Le Coz, Y #
Issue Date: Jul-2002
Publisher: American physical soc
Series Title: Physical Review C vol:66 issue:1
Article number: 014313
Abstract: 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.
URI: 
ISSN: 0556-2813
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
# (joint) last author

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