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Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 45: Nuclear Physics / Spectroscopy VII

HK 45.2: Group Report

Thursday, March 14, 2002, 16:30–17:00, B

Shape coexistence in the Pb region — •kris heyde1, ruben fossion1, and jose-enrique garcia-ramos21Department of subatomic and radiation physics, University of Gent, Proeftuinstraat,86 B-9000 Gent (Belgium) — 2Departamento de Fisica Aplicada. EPS La Rabida, Universidad de Huelvam 21819 Palos de la Frontera, Spain

The Pb region has formed a most interesting testing region and in recent experiments (in-beam work, beta-decay, alpha-decay,..) using state-of-the art techniques, evidence has resulted for the coexistence of both spherical, oblate and prolate structures. The data basis at present encompasses both the region near the doubly-closed shell Z=82,N=126, the neutron-deficient region spanning all the way down to neutron mid-shell N=104 and also, presently, is bringing in results on the heaviest Pb nuclei ( beyond N=126).

Using both algebraic methods in which multi-particle multi-hole excitations across the Z=82 shell are treated as extra pairs, as well as using deformed mean-field calculations, a comprehensive set of results is obtained. Thereby we accentuate both the symmetry aspects that govern the interacting boson model algebraic structures as well as the shape degrees of freedom that become active in these single-closed shell nuclei.

We shall higlight both the extensive data basis as well as the recent theoretical results.

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