Résumé du preprint Irfu-09-211

Irfu-09-211
Emission Probabilities of \gamma-rays from 238Np and their use for determination of the Thermal Neutron Capture Cross Section of 237Np
A. Letourneau , F. Marie, P. Mutti, I. AlMahamid
The relevant absolute \\gamma-ray emission probabilities from the \\beta-decay of 238Np were measured by means of \\alpha and \\gamma-spectroscopic techniques. We obtained values of (25.6±0.4) %, (8.9±0.2) % and (18.8±0.3) % for the 984.45, 1025.87 and 1028.54 keV \\gamma-rays, respectively, in agreement with the previous measured ones. These intensities were used to deduce the thermal neutron capture cross section of 237Np for which a value of (182.2±4.5) b is obtained higher by 11% than the recommended value.