New evaluations of n + Cu and n + Zr cross-section data for neutron energies up to 200 MeV

P Pereslavtsev,A Konobeyev,U Fischer,L Leal

doi:10.1051/epjconf/201714602039

Abstract

This work presents evaluated general purpose nuclear data files for the n+ 63,65 Cu and n+ 90,91,92,94,96 Zr reactions for neutron energies up to 200 MeV. The TALYS-1.8 code was used for the nuclear model simulations in the energy range from 1 keV to 200 MeV. To improve the pre-equilibrium particle emission the Geometry-Dependent Hybrid model (GDH) was used as option implemented in an extended version of the code as option. Resonance data based on recent measurements and their covariances were included in the files. A set of covariance data for all nuclear reactions was also prepared and included in the evaluations. The adjustments of the nuclear model parameters were performed to fit both available differential and integral measured data. The evaluated data were carefully checked against the latest fusion relevant integral measurements.

Highlights

In the framework of the European fusion programme nuclear data evaluations are performed to enable qualified particle transport calculations of fusion devices such as ITER and DEMO
The improvement of the nuclear data base is an important element of quality assured analyses for the design and optimisation of these facilities and related neutron sources like IFMIF
Consistent evaluated data sets are of high priority for applications to ITER, DEMO and IFMIF/DONES with quality assured design, optimisation and performance analyses

Summary

Introduction

The available nuclear data evaluations for stable 90,91,92,94,96 Zr isotopes are not as consistent as required for accurate activation and particle transport calculations. Consistent evaluated data sets are of high priority for applications to ITER, DEMO and IFMIF/DONES with quality assured design, optimisation and performance analyses. In spite of TALYS’ high predictive power, additional specific improvements can be reached by using in the TALYS calculations an extra model for the pre-equilibrium reactions description, Geometry Dependent Hybrid model (GDH) [3]. This model was implemented in the extended version of TALYS. All uncertainties arising in the evaluations due to the adjustment procedure of the reaction cross sections are accounted for in the elastic scattering cross section, keeping the total cross section unchanged

Resonance data

Benchmark calculations

Evaluated data files

Conclusions