A series of measurements of 237 Np fission cross section have been performed at the CERN spallation neutron facility n_TOF which covers a wide energy range from 1 eV up to 250 MeV. A fast ionization chamber (FIC) was used as a fission fragment detector with registration efficiency of not less than 97 %. Particular attention was paid to correct the fission
PACSInternational audienceAll the stable lead isotopes and 209Bi have been recently measured at n_TOF (CERN) in the range from 1 eV up to 1 MeV, using an optimized experimental setup, A set of two homemade C6D6 detectors with carbon-fibre canning was designed to greatly reduce the sensitivity to scattered neutrons. Surrounding elements like the sample holder and the sample exchanger have been made also of carbon fibre.The pulse-height weighting technique has been used in order to determine the (n,gamma) cross sections. Concerning this technique, special care has been taken in the treatment of several sources of error leading to a total systematic uncertainty of less than 3%.Results on the analysed 209Bi and 207Pb capture data and a comparison with previous experiments and evaluations are presented
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