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HK: Fachverband Hadronen und Kerne

HK 48: Nuclear Structure and Dynamics I

HK 48.2: Vortrag

Mittwoch, 18. März 2009, 14:15–14:30, H-ZO 40

Shape Phase Transitions in even and odd systems — •Lorenzo Fortunato¹, Andrea Vitturi¹, Clara Alonso², and Josè Arias² — ¹Dip. Fisica “G.Galiei”, Università di Padova and INFN (Italy) — ²Departamento FAMN, Universidad de Sevilla (Spain)

The onset of shape phase transitions in even as well as odd systems are reviewed. We discuss the case of an odd j = 3/2 particle coupled to an even-even boson core that undergoes a transition from spherical limit (U(5)) to the γ-unstable limit (O(6)). Energy spectrum and electromagnetic transitions, in correspondence of the critical point, display behaviors qualitatively similar to those of the even core and they agree qualitatively with the model based on the E(5/4) boson-fermion symmetry. Then we describe two-particle transfer reactions: the evolution of the transfer spectroscopic intensities within the interacting boson model is analyzed as a possible signature of shape-phase transitions. In correspondence to the critical points characterizing the phase transitions, the two-particle transfer matrix elements to both ground and excited 0⁺ states display a rapid discontinuity that might help validating the experimental search for the critical point.