Evidence for low-lying prolate bands in 188Pb and 186Pb

Heese, J.; Maier, K. H.; Grawe, H.; Grȩbosz, J.; Kluge, H.; Męczyński, W.; Schramm, Michael; Schubart, R.; Spohr, K.; Styczeń, J.

doi:10.1016/0370-2693(93)90415-e

Cited by 87 publications

(53 citation statements)

References 20 publications

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“…Collective yrast bands, similar to those observed in neutron deficient even mass Hg and Pt isotopes [1,2], have also been observed in even mass 182−188 Pb isotopes [9][10][11][12]. All these yrast bands have been associated with the prolate minimum.…”

Section: Introductionmentioning

confidence: 64%

Lifetimes of intruder states in 186Pb, 188Pb and 194Po

et al. 2008

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Section: Introductionmentioning

confidence: 64%

Lifetimes of intruder states in 186Pb, 188Pb and 194Po

et al. 2008

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“…11 and 12, combined with the existing information on shape coexistence in the Pb region [1,3,4,5,6,7,8,9,10,11,12,13,14], stresses the conclusion that secondary minima in the PES (shape coexistence) are related to the distinct balance of prolate and oblate energy di erence of both protons and neutrons for a given con guration. Based on this observation, it is interesting to note that the Rn isotopes should beexpected to exhibit the same variety of coexisting shapes as the Po and Pb isotopes (close to spherical, oblate and prolate).…”

Section: Potential Energy Surface Calculationsmentioning

confidence: 82%

“…The stronger deformed bands identi ed in 188 Pb and 186 Pb [7,8] and very recently in 190 Pb and 184 Pb [9,10] correspond most probably with a proton 4p-4h character, or prolate deformation, and become the yrast band in 186 Pb.…”

Section: Introductionmentioning

confidence: 84%

“…In a very recent work concerning the decay of 192 Po [49], the population of a third low-lying 0 + state in 188 Pb was reported. It is interpreted as being the band-head of the low-lying collective band already observed in-beam [7], which is supposed to have a prolate deformation and arise from a proton 4p-4h excitation. The population of a 4p-4h con guration in 188 Pb should bestrongly favoured in the decay proceeding from a dominant proton 4p-2h component in the ground-state of 192 Po.…”

Section: Intruder States and The Pairing Vibration Modelmentioning

confidence: 91%

“…The Pb nuclei have been studied in-beam down to N=102 [7,8,9,10], the Po nuclei down to N=108 [11,12] and the Rn nuclei down to N=112 [13,14]. Many of the previous results are very recent and are due to a very intensive activity close to the limits of the current experimental techniques, which concentrates on the shape coexistence phenomenon in the Pb mass region.…”

Section: Introductionmentioning

confidence: 99%

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Shape coexistence in the light Po isotopes

Oros¹,

Heyde²,

Coster³

et al. 1998

Exotic Nuclei and Atomic Masses (ENAM 98)

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The systematics of the even light P o isotopes (N 126) are studied in the framework of the Particle-Core Model. The strong perturbation of the systematics in the very light isotopes is interpreted as arising from the interaction between regular and intruder structures. Results of Potential Energy Surface (PES) calculations and predictions of the Pairing Vibration Model support this interpretation. The mixing between the regular and intruder structures is studied within the IBM-2 and in a simple two-state mixing picture. Matrix elements of the interaction and their spin-dependence are extracted. The 'reconstructed systematics' show the coexistence of a spherical structure, which v aries little with the neutron number, with an intruder band, strongly lowered in energy as the neutron numberapproaches midshell. The crossing of the two con gurations takes place over a few isotopes; the intruder band becomes the ground-state con guration in 192 Po.

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