UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2013 Meeting


Section: Nuclear and Elementary Particles Physics


Title:
Radiative strength function low-energy enhancement within Enhanced Generalized Lorentzian model


Authors:
V. Avrigeanu and M. Avrigeanu


Affiliation:
Horia Hulubei National Institute for Physics and Nuclear Engineering, P.O. Box MG-6, 077125 Bucharest-Magurele, Romania


E-mail
Vlad.Avrigeanu@nipne.ro


Keywords:
nuclear reaction, statistical model, gamma-ray strength functions


Abstract:
An enhanced generalized Lorentzian model (EGLO) has been adopted for the electric dipole gamma-ray strength functions on the basis of the GLO form of Kopecky and Uhl [1] that included a temperature dependence of the already energy-dependent giant dipole resonance (GDR) width. While the GLO model was able to avoid the extrapolation of the SLO function in the limit of zero gamma-ray energy, it provided a rather constant nonzero limit but no enhancement at the lowest energies below ~3 MeV [2,3]. We have followed Larsen and Goriely [4] and considered the modified width of the GLO model with an additional gamma-ray energy dependence of its temperature dependence, but using the usual temperature formula [1] with the rotational energy subtracted from the excitation energy. The results obtained for Mo isotopes reproduce not only the experimental radiative strength function low-energy enhancement but also the absolute values without any normalization. Their further involvement within alpha-particle induced reaction cross section analysis [5] is supported by the accurate description of the measured data. [1] J. Kopecky and M. Uhl, Phys. Rev. C 41, 1941 (1990). [2] M. Guttormsen et al., Phys. Rev. C 71, 044307 (2005). [3] M. Wiedeking et al., Phys. Rev. Lett. 108, 162503 (2012). [4] A. C. Larsen and S. Goriely, Phys. Rev. C 82, 014318 (2010); I. Daoutidis and S. Goriely, Phys. Rev. C 86, 034328 (2012). [5] M. Avrigeanu and V. Avrigeanu, Phys. Rev. C 82, 014606 (2010); ND-2013 JB2.