Microscopic description of the pygmy dipole resonance and its contribution to radiative capture
- Moscow State University, Skobelzyn Institute of Nuclear Physics, Moscow 11991 (Russian Federation)
- Institut d'Astronomie et d'Astrophysique, ULB, CP 226, B-1050 Brussels (Belgium)
- Institute of Physics and Power Engineering, 240033 Obninsk Russia (Russian Federation)
The radiative capture cross sections for the compound nuclei {sup 100}Sn, {sup 132}Sn and {sup 144}Nd have been calculated using both self-consistent and non-selfconsistent microscopic theories which, in addition to the standard RPA or QRPA approaches, take the single-particle continuum and phonon coupling into account. We show that the inclusion of the phonon coupling is necessary for a proper description of the pygmy resonance. Consequently, the radiative capture cross sections and corresponding rates are increased by a factor of 2-3 as compared with RPA or QRPA approaches. We conclude that the present approach provides a more complete and coherent description of the {gamma}-ray strength function than the previous models used so far and for astrophysics applications in particular, such calculations are highly recommended for a more reliable estimate of the electromagnetic properties of exotic nuclei.
- OSTI ID:
- 21255398
- Journal Information:
- AIP Conference Proceedings, Vol. 1090, Issue 1; Conference: 13. international symposium on capture gamma-ray spectroscopy and related topics, Cologne (Germany), 25-29 Aug 2008; Other Information: DOI: 10.1063/1.3087002; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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