Measurements of delayed neutrons yields and time spectra from 1 GeV protons interacting with thick natPb, 209Bi and natFe targetsD. Ridikas1, A. Barzakh2, V. Blideanu1, J.-C. David1, D. Doré1, D. Fedorov2, X. Ledoux3, F. Moroz2, V. Panteleev2, R. Plukiene4, A. Plukis4, A. Prévost1, O. Shcherbakov2 and A. Vorobyev2
1 CEA Saclay, DSM/DAPNIA, 91191 Gif-sur-Yvette, France
2 Petersburg Nuclear Physics Institute, 188350 Gatchina, Leningrad district, Russia
3 CEA/DIF, DPTA/SPN, 91680 Bruyères-le-Châtel, France
4 Institute of Physics, Savanoriu pr. 231, 02300 Vilnius, Lithuania
Published online: 21 May 2008
This paper presents the experimental results on the DN yields and time spectra from 1 GeV protons interacting with the natPb, 209Bi and natFe targets of variable thicknesses from 5 cm to 55 cm. Both absolute yields and time constants were obtained. In parallel, the MCNPX and PHITS codes were used to predict the DN precursors and construct the theoretical DN tables. Different model parameters are examined and show significant dependence on the choice of the intra-nuclear cascade and fission-evaporation models used. These data and modelling are of great importance for the new generation spallation neutron sources based on liquid metal technologies. Finally, the above experiment allowed the determination of the production cross sections of a number of DN precursors as, 87Br, 88Br and 17N. These results permit the examination of two different reaction mechanisms, namely fission and fragmentation, implemented in high energy transport codes.
© CEA 2008