Instantaneous shape sampling: A model for the γ-absorption cross section of transitional nuclei

Bentley, I. and Brant, Slobodan and Donau, F. and Frauendorf, S. and Kampfer, B. and Schwengner, R. and Zhang, S. Q. (2011) Instantaneous shape sampling: A model for the γ-absorption cross section of transitional nuclei. Physical Review C, 83 (1). pp. 14317-15. ISSN 0556-2813

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The influence of the quadrupole shape fluctuations on the dipole vibrations in transitional nuclei is investigated in the framework of the instantaneous shape sampling model, which combines the interacting boson model for the slow collective quadrupole motion with the random phase approximation for the rapid dipole vibrations. Coupling to the complex background configurations is taken into account by folding the results with a Lorentzian with an energy-dependent width. The low-energy portion of the γ-absorption cross section, which is important for photonuclear processes, is studied for the isotopic series of Kr, Xe, Ba, and Sm. The experimental cross sections are well reproduced. The low-energy cross section is determined by the Landau fragmentation of the dipole strength and its redistribution caused by the shape fluctuations. Collisional damping only wipes out fluctuations of the absorption cross section, generating the smooth energy dependence observed in experiment. In the case of semimagic nuclei, shallow pygmy resonances are found, in agreement with experiment.

Item Type: Article
Date: January 2011
Subjects: NATURAL SCIENCES > Physics > Nuclear Physics
Additional Information: Copyright (2011) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191005-1010
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 01 Jun 2014 20:11
Last Modified: 24 Feb 2016 15:25

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