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COLLECTIVE MODES WITHIN SKYRME-SECOND RPA

Abstract : Second RPA calculations with a Skyrme force are performed to describe both high- and low-lying excited states in 16O. The coupling between 1 particle-1 hole and 2 particle-2 hole as well as that between 2 particle-2 hole configurations are fully taken into account and the residual interaction is never neglected. For the rearrangement terms in the matrix elements beyond standard RPA two approximations are employed: they are either neglected or evaluated with the RPA procedure. A several-MeV shift of the strength distribution to lower energies is systematically found with respect to RPA distributions. A better description of the excitation energies of the low-lying 0+ and 2+ states is obtained with second RPA with respect to RPA.
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http://hal.in2p3.fr/in2p3-00514849
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Submitted on : Friday, September 3, 2010 - 2:08:09 PM
Last modification on : Sunday, November 8, 2020 - 12:26:02 PM

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M. Grasso, D. Gambacurta, F. Catara. COLLECTIVE MODES WITHIN SKYRME-SECOND RPA. International Symposium on Forefronts of Researches in Exotic Nuclear Structures, Mar 2010, Niigata, Japan. pp.1919-1922, ⟨10.1142/S0217732310000642⟩. ⟨in2p3-00514849⟩

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