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HK: Fachverband Hadronen und Kerne
HK 48: Nuclear Structure and Dynamics I
HK 48.4: Talk
Wednesday, March 18, 2009, 14:45–15:00, H-ZO 40
New Interpretation of Pair Transfer Reactions Between Collective 0+ States — •Linus Bettermann1, Rod M. Clark2, Richard F. Casten3,1, and Ryan Winkler3 — 1Institut für Kernphysik, Universität zu Köln, Cologne, Germany — 2Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA — 3Wright Nuclear Structure Laboratory, Yale University, New Haven, Conneticut
It is experimentally known, that in nearly all cases ground state cross sections dominate in nucleon pair transfer reactions in collective nuclei. Exceptions of this behavior in which cross sections to excited 0+ states are comparable to the ground state cross sections can be found in the phase transitional region. In this regions rapid changes from spherical to deformed nuclei appear. This has led to a correlation of the phase transitional region to large cross sections to excited 0+ states in pair transfer reactions in the past. We performed IBM calculations throughout the entire symmetry triangel, which leads to a new, more general interpretation. This includes the experimentaly known small cross sections to excited 0+ states in most regions of the nuclear chart and larger in transitional regions. Additionaly our interpretation predicts large cross sections in regions of large structural change that occur without passing through a phase transition. We will present results of the IBM calculations and show cases in which our predictions can be tested experimentally. Work supported in part by USDOE under grant No. DE-FG02-91ER-40609, DFG under grant No. Jo391/3-2 and through a Mercator Guest Professorship at University of Cologne.