Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 19: Nuclear Structure/Spectroscopy III

HK 19.5: Talk

Tuesday, March 9, 2004, 17:00–17:15, D

E1 strength distribution in N=82 nuclei^* — •S. Volz, M. Babilon, W. Bayer, D. Galaviz, T. Hartmann, A. Kretschmer, K. Lindenberg, S. Müller, D. Savran, K. Sonnabend, K. Vogt, and A. Zilges — Institut für Kernphysik, Technische Universität Darmstadt, Germany

Recently much effort in theory and experiment has been spent to get a deeper insight into low lying electric dipole excitations between about 5 and 10 MeV. This strength is usually denoted as Pygmy Dipole Resonance. A well suited experimental technique to determine the electric dipole strength distribution is Nuclear Resonance Fluorescence (NRF) [1]. With this method it was possible to determine the absolute transition strengths of excitations in the N=82 isotones ¹³⁸Ba, ¹⁴⁰Ce, and ¹⁴⁴Sm [2]. In a recent experiment at the injector of the S-DALINAC at TU Darmstadt the nucleus ¹⁴²Nd has been measured and it is now possible to discuss a systematic trend of the mode. In addition calculations in the Quasi Particle Phonon Model will be presented [3,4].
^* supported by the DFG (SFB 634 and Zi510/2-2)

[1] U. Kneissl et al., Prog. Part. Nucl. Phys. 37, 349 (1996)

[2] A. Zilges et al., Phys. Lett. B 542, 43 (2002)

[3] V.Yu. Ponomarev, private communication

[4] N. Tsoneva, private communication