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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 (Engelska)Ingår i: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 66, nr 1Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2002. Vol. 66, nr 1
Nyckelord [en]
gamma-ray spectroscopy, light po isotopes, polonium isotopes, platinum isotopes, intruder states, excited-states, capture decay, neutron, identification, deformation
Identifikatorer
URN: urn:nbn:se:kth:diva-21834DOI: 10.1103/PhysRevC.66.014313ISI: 000177529700025OAI: oai:DiVA.org:kth-21834DiVA, id: diva2:340532
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QC 20100525Tillgänglig från: 2010-08-10 Skapad: 2010-08-10 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Wyss, Ramon
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Physical Review C. Nuclear Physics

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