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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Structure and Dynamics of Nuclei 2

HK 7.6: Vortrag

Montag, 23. März 2015, 16:00–16:15, T/SR14

Second random-phase approximation with chiral two- plus three-body interactions — •Richard Trippel and Robert Roth — Institut für Kernphysik, Technische Universität Darmstadt

The random-phase approximation (RPA) is a standard tool for the description of collective excitations in nuclei. Its extension, the second RPA (SRPA) is applied to a number of doubly-magic nuclei using chiral interactions.

For the calculations we use normal-ordered two- plus three-body interactions derived from chiral effective field theory, which have successfully been applied to medium-mass nuclei in various frameworks. These bare interactions are transformed by means of the similarity renormalization group (SRG) to improve convergence. The calculations are performed for interactions with and without initial three-nucleon forces. From the solution of the SRPA problem we compute various electric transition strengths and examine the impact of second-order contributions. An investigation of the convergence properties of the results w.r.t. our model-space truncations is made. We compare the induced and initial three-nucleon forces with each other and with experimental values.

Supported by DFG (SFB 634), HIC for FAIR and BMBF (06DA7047I).