Neutron-induced fission cross section on actinides using microscopic fission energy surfaces

Abstract

Abstract. Microscopic Hartree-Fock-Bogolyubov (HFB) calculations are now available and can provide all the nuclear ingredients required to describe the fission path from the equilibrium deformation up to the nuclear scission point. The aim of this paper is to apply the basic features of the optical model for fission, using the full microscopic information obtained from HFB models to calculate neutron-induced fission cross sections on selected actinide nuclei. This approach includes not only the details of the energy surface along the fission path, but also the estimate of the nuclear level density derived within the combinatorial approach on the basis of the same HFB single-particle properties, in particular at the fission saddle points. The sensitivity of the calculated fission transmission coefficients to different model approximations is studied and the predictive power of such a microscopic approach tested.

EMPIRE: Nuclear Reaction Model Code System for Data Evaluation

“…(173). The weight w is energy-dependent and ranges from 0 for excitation energies close to the bottom of the well(s) to 1 for excitation energies close to the height of the lowest barrier [86]. Compared to the optical model for fission, this alternative approach has the advantage of describing the direct and indirect fission mechanisms without involving many parameters.…”

“…Therefore only the latter will be described in this paper. Further details of the general formula can be found in [86].…”

Calculation of Excitation Function of Some Structural Fusion Material for (n, p) Reactions up to 25 MeV

“…In present paper, (n, p) reactions for some structural fusion materials such as 27 Cr reaction with available experimental values and evaluated nuclear data files ENDF/B-VI, JENDL-3.3 and JEFF3.1. The values reported in Ref.…”

“…Equilibrium and pre-equilibrium particle emissions during the decay process of a CN are very important for a better understanding of the nuclear reaction mechanism induced by medium energy particles. The highly excited nuclear system produced by charged particles' first decays by emitting fast nucleons at the pre-equilibrium (PE) stage and, later on, by the emission of low-energy nucleons at the equilibrium (EQ) stage [17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

“…A focus of the research and development effort is to understand these effects, and through the development of specific compositions and microstructures, produce materials with improved and adequate performance [9,10]. 27 Al, 51 V, 52 Cr, 55 Mn and 56 Fe nuclei are the some structural fusion materials [11,12]. Nuclear data evaluation is generally carried out on the basis of experimental data and theoretical model calculations.…”