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HK: Fachverband Hadronen und Kerne

HK 27: Nuclear Structure and Dynamics II

HK 27.7: Eingeladener Gruppenbericht

Dienstag, 17. März 2009, 15:30–16:00, H-ZO 50

Modern Beyond Mean Field Theories — •J. Luis Egido and Tomás R. Rodríguez — Universidad Autónoma de Madrid, Madrid, Spain

In this talk we review the progress made in the last years in Beyond Mean Field Theories. After a pedagogical presentation of concepts, like spontaneous symmetry breaking, angular momentum -and particle number- projection as well as configuration mixing, several applications of the theory will be presented.

First we study the recently proposed shell closures at N=32 and N=34. We have calculated the excitation energy of the 2+ states in the Ca, Ti and Cr isotopes. Our results nicely follow the experimental trend in all three nuclides. In particular we predict a shell closure for N=32 but not for N=34.

In a second application the spherical to prolate deformed shape transition in the Neodymium isotopic chain is analyzed. Our results do not support the interpretation of 150Nd as a critical point nucleus and question the interpretation of shape changes as nuclear shape phase transitions.

As a third issue the pathological excitation energies of the 2+ states of the Cd isotopes close to the semimagical 130Cd is analyzed. We find that it can be explained by a very remarkable nuclear structure effect.

Finally, preliminary results of the first triaxial angular momentum projection with the finite range density dependent Gogny interaction will be presented. In all calculations the D1S parametrization of the Gogny force will be used.