Emission probabilities of gamma-rays from 238Np and their use for determination of the thermal neutron capture cross section of 237Np.
The relevant absolute gamma-ray emission probabilities from the beta-decay of (238)Np 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 (237)Np for which a value of (182.2+/-4.5)b is obtained higher by 11% than the recommended value.
Letourneau
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Irfu, CEA-Saclay, 91191 Gif-sur-Yvette, France. aletourneau@cea.fr
Marie
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Mutti
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Almahamid
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