Neutron-induced fission cross section of 240,242Pu up to En = 3 MeV

The neutron-induced fission cross sections of 240,242Pu have been measured at JRC-IRMM with incident neutron energy from 0.2 MeV up to 3 MeV. A Twin-Frisch Grid Ionization Chamber (TFGIC) has been used in a back-to-back geometry. The measurements have been performed using the secondary standards 237Np and 238U as a reference. The purity of the plutonium samples was 99.89% for 240Pu and 99.97% for 242Pu. The results obtained follow the ENDF/B-VII.1 evaluation for 240Pu, but some discrepancies are visible around En = 1 MeV for 242Pu. In addition, the spontaneous fission half-life has been measured for both isotopes.

SALVADOR CASTINEIRA Paula;  BRYS Tomasz;  HAMBSCH Franz-Josef;  OBERSTEDT Stephan;  PRETEL C.;  VIDALI Marzio; 

2015-01-12

ACADEMIC PRESS INC ELSEVIER SCIENCE

JRC92015

0090-3752,   

http://www.sciencedirect.com/science/article/pii/S0090375214005511,    http://dx.doi.org/10.1016/j.nds.2014.08.017,    https://publications.jrc.ec.europa.eu/repository/handle/JRC92015,   

10.1016/j.nds.2014.08.017,