Köln 2004 – scientific programme

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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. Babilon^1,2, 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.