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The neutron-induced fission cross section of 237 Np was experimentally determined at the high-resolution and high-intensity facility n TOF, at CERN, in the energy range 100 keV to 9 MeV, using the 235 U(n,f) and 238 U(n,f) cross section standards below and above 2 MeV, respectively. A fast ionization chamber was used in order to detect the fission fragments from the reactions and the targets were characterized as far as their mass and homogeneity are concerned by means of α spectroscopy and Rutherford backscattering spectroscopy respectively. Theoretical calculations within the Hauser-Feshbach formalism have been performed, employing the EMPIRE code, and the model parameters were tuned in order to successfully reproduce the experimental fission cross-sectional data and simultaneously all the competing reaction channels.

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Cross sections and forward/backward ratios in the laboratory reference system were measured for the 143 Nd(n,α) 140 Ce reaction at 4.0, 5.0, and 6.0 MeV and for the 147 Sm(n,α) 144 Nd reaction at 5.0 and 6.0 MeV. A twin-gridded ionization chamber and large-area back-to-back 143 Nd 2 O 3 samples and 147 Sm 2 O 3 samples were employed. Experiments were performed at the 4.5 MV Van de Graaff accelerator of Peking University, China. Fast neutrons were produced through the 2 H(d,n) 3 He reaction by using a deuterium gas target. A small 238 U fission chamber was employed for absolute neutron flux determination, and a BF 3 long counter was used as the neutron flux monitor. Present experimental data are compared with previous measurements, evaluations, and model calculations.

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