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Recent Advances in Nuclear Fission Theory: Pre- and Post-Scission Physics
P. Talou,T. Kawano,J. E. Lynn,P. Moller,O. Bouland,M. B. Chadwick 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Recent advances in the modeling of the nuclear fission process for data evaluation purposes are reviewed. In particular, it is stressed that a more comprehensive approach to fission data is needed if predictive capability is to be achieved. The link between pre- and post-scission data is clarified and a path forward to evaluate those data in a consistent and comprehensive manner is presented. Two examples are given: (i) the modeling of fission cross-sections in the R-matrix formalism, for which results for Pu isotopes from A = 239 to 242 are presented; (ii) the modeling of prompt fissionneutrons in the Monte Carlo Hauser-Feshbach framework. Results for neutron-induced fission on ^(235)U are discussed.
Applications of the Hauser-Feshbach Theory to Advanced Nuclear Sciences
T. Kawano,P. Talou,M. B. Chadwick,S. Holloway,P. Moller,T. Watanabe 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Unique applications of the Hauser-Feshbach (HF) statistical theory in the nuclear science field, as well as the HF model code development at LANL are discussed. Our applied field in which HF is applicable is not necessarily limited to the particle-induced reactions. We combine the HF model with a theory of β-decay to calculate the β-delayed neutron and γ-ray emissions. These calculations can be performed for each β-decay precursor to estimate aggregate neutron and γ-ray energy release at fission. Another relatively new example at LANL is the ability to compute HF predictions with a Monte Carlo technique (MCHF), which gives all the correlated information.
Towards Consistent Nuclear Models and Comprehensive Nuclear Data Evaluations
O. Bouland,G. M. Hale,J. E. Lynn,P. Talou,D. Bernard,O. Litaize,G. Noguere,C. De Saint Jean,O. Serot 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The essence of this paper is to enlighten the consistency achieved nowadays in nuclear data and uncertainties assessments in terms of compound nucleus reaction theory from neutron separation energy to continuum. Making the continuity of theories used in resolved ($R$-matrix theory), unresolved resonance (average $R$-matrix theory) and continuum (optical model) ranges by the generalization of the so-called SPRT method, consistent average parameters are extracted from observed measurements and associated covariances are therefore calculated over the whole energy range. This paper recalls, in particular, recent advances on fission cross section calculations and is willing to suggest some hints for future developments.