UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2011 Meeting


Section: Nuclear and Elementary Particles Physics


Title:
Recent improvements brought to the nuclear reaction code TALYS


Authors:
C. Morariu (1), G. Noguere (2), A. Tudora (1)


Affiliation:
(1) Bucharest University, Faculty of Physics, RO 077135, Bucharest-Magurele, Romania

(2) CEA-Cadarache, F-13108 Saint Paul lez Durance, France


E-mail
claudia.morariu@gmail.com


Keywords:
TALYS, fission, level density parameter, collective enhancement factors


Abstract:
TALYS is a computer code system for the analysis and prediction of nuclear reaction data. A suite of nuclear reaction models are implemented into this single code system, that makes it able to evaluate nuclear reactions over a large incident energy range, from the unresolved resonance region up to energies of 200 MeV. Nuclear level densities represent a very important ingredient in statistical model calculations of nuclear reaction cross sections, not only for spherical nuclei and nuclei at the ground state deformation, but also for the deformation of nuclei over the fission path. The present work refers to the improvements brought to the TALYS code, related to the treatment of the level density parameter and the modeling of the enhancement factors. In TALYS the level density parameter can be calculated by phenomenological and microscopic level density models (as the superfluid model of Ignatyuk and the Fermi-Gas model) or taken from different databases. The level density parameter determination from the average s- or p-wave level spacing at the neutron binding energy, , is of significant importance. This straightforward procedure, implying to solve a transcendent equation, has been implemented in the new version of the code. An other performed improvement consists in the implementation of the collective enhancement factors relative to the ground state deformation, according to the fission model developed by prof. G. Vladuca and coworkers, contained in the Statis code, and further implemented in the codes Gnash and Empire.