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HK: Physik der Hadronen und Kerne
HK 19: Nuclear Structure/Spectroscopy III
HK 19.8: Talk
Tuesday, March 9, 2004, 17:45–18:00, D
Low lying dipole strength in nuclei around the Z=20-shell closure — •T. Hartmann1, M. Babilon1,2, W. Bayer1, D. Galaviz1, S. Kamerdhziev3, A. Kretschmer1, K. Lindenberg1, E. Litvinova3, S. Müller1, D. Savran1, K. Sonnabend1, K. Vogt1, S. Volz1, and A. Zilges1 — 1Institut für Kernphysik, Technische Universität Darmstadt, Germany — 2Physics Department - Wright Nuclear Structure Laboratory, Yale University, New Haven, CT, USA — 3Institute of Physics and Power Engineering, Obninsk, Russia
Photon-scattering experiments have been performed on the semi-magic nucleus
44Ca to investigate the low-lying electric dipole strength below 10
MeV.
Earlier experiments on the two doubly-magic nuclei 40,48Ca had shown a
significant difference in their E1-strength which exhaust 0.02% and
0.33%
of the isovector EWSR, respectively [1]. The E1-strength in 44Ca is
more fragmented. About 0.39% of the EWSR is exhausted below 10 MeV.
Theoretical predictions within the Extended Theory of Finite Fermi Systems
(ETFFS) describe the general trend and the fragmentation of the strength in
the three Calcium isotopes quite well, the absolute strength is reproduced
within a factor of 2.
* supported by the DFG (SFB 634 and Zi510/2-2)
[1] T. Hartmann et al., Phys. Rev. C65 (2002) 034301.