Evaluation of 4He production cross-section for tantalum, tungsten and gold irradiated with neutrons and protons at the energies up to 1 GeV

Popular nuclear models and approaches used for the description of the alpha-particle emission in the nucleon induced reactions at the intermediate energies were analyzed. The alpha-particle emission spectra, the non-equilibrium alpha-particle yields and the total alpha-production cross-sections were calculated with the help of the GNASH code, the modified ALICE code, the DISCA code and the different codes from the MCNPX package. The results of the calculation were compared with available experimental data, systematics values and data from ENDF/B-VI and JENDL-HE. Data from FENDL/A-2, JENDL-3.3, CENDL-2 and JEFF-3/A were also used for the comparison with calculations and measured data for neutron induced reactions below 20 MeV. The discrepancies between the calculations and the experimental data have been analyzed. The a-particle production cross-section has been evaluated for Ta-181, W-nat and Au-197 at the energies of the incident neutrons and protons from several MeV to 1 GeV. (c) 2005 Elsevier B.V. All rights reserved.