Gamma-ray strength function and pygmy resonance in rare earth nuclei

Details Gamma-ray strength function and pygmy resonance in rare earth nuclei Gamma-ray strength function and pygmy resonance in rare earth nuclei

2000-09-26

arxiv.org/abs/nucl-ex/0009018v1

Phys.Rev. C63 (2001) 044313

Physics

Nuclear Physics

Nuclear Experiment

11 pages, including 4 figures and 2 tables

Scientific paper

10.1103/PhysRevC.63.044313

The gamma-ray strength function for gamma energies in the 1-7 MeV region has been measured for 161,162-Dy and 171,172-Yb using the (3-He,alpha gamma) reaction. Various models are tested against the observed gamma-ray strength functions. The best description is based on the Kadmenskii, Markushev and Furman E1 model with constant temperature and the Lorentzian M1 model. A gamma-ray bump observed at E_gamma=3 MeV is interpreted as the so-called pygmy resonance, which has also been observed previously in (n,gamma) experiments. The parameters for this resonance have been determined and compared to the available systematics.

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