Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 71: Nuclear Structure and Dynamics I

HK 71.7: Talk

Thursday, March 19, 2009, 18:45–19:00, H-ZO 40

Low-energy dipole and quadrupole states related to neutron skins — •Nadia Tsoneva^1,2 and Horst Lenske¹ — ¹Institut für Theoretische Physik, Universität Giessen, Germany — ²Institute for nuclear research and nuclear energy, Sofia, Bulgaria

We present investigations on dipole and quadrupole excitations in skin nuclei, in particular in the N=50, 82 isotones and Z=50 isotopes. We explore their connection to the thickness of the neutron(proton) skin, respectively. Our theoretical method relies on density functional theory which provides us with a proper link between nuclear many-body theory of the nuclear ground state and its phenomenological description [1]. For the calculation of the nuclear excited states we apply QPM theory. From QPM calculations in these nuclei we observe low-energy dipole strength located below the particle emission threshold and related to the size of the neutron(proton) skin [1]. The genuine character of the PDR mode as a skin vibration is confirmed by the shape and structure of the transition densities. The spectral distributions are in a good agreement with the available experimental data [1]. In addition, quadrupole states are investigated along isotopic chains. By analysing their state vectors and transition densities a clear separation between collective isoscalar, isovector and mixed symmetry states is achieved. A new quadrupole mode related to PQR [2] in tin isotopes is suggested.
Work supported by DFG project Le 439/1-7.
N. Tsoneva, H. Lenske, Phys. Rev. C 77, 024321 (2008).
N. Tsoneva and H. Lenske, CGS13 Conf. Proc, to be publ.