International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07646

Measurements of delayed neutrons yields and time spectra from 1 GeV protons interacting with thick ^natPb, ²⁰⁹Bi and ^natFe targets

D. 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. Vorobyev<sup>2

1</sup>  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

ridikas@cea.fr

Published online: 21 May 2008

Abstract
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