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The neutron induced fission of 237Np has been investigated at different incident neutron energies, produced at the 7 MV Van de Graaff accelerator of the IRMM. Mass, kinetic energy and angular distributions for both fission fragments have been measured with a double Frisch-gridded ionisation chamber in the region of the fission threshold as well as in the plateau region. The existence of a fission threshold and the odd-odd structure of the compound nucleus 238Np with the absence of pairing effects provides an ideal testground for theoretical model calculations on the basis of the multi-modal random neck-rupture model. The calculations resulted in three standard and one super-long fission mode for 238Np. For the related scission configurations, the fragment properties have been calculated for all measured neutron energies. The predictions of the model calculations have been compared with the experimental results. The changes in the fission fragment distribution could be interpreted in terms of changing contributions of the fission modes.

Additional information

Authors: SIEGLER P, JRC Geel (BE);HAMBSCH F-J, JRC Geel (BE);THEOBALD J P, Institut für Kernphysik, Darmstadt (DE)
Bibliographic Reference: Paper presented: Workshop on Nuclear Fission and Fission Product Spectroscopy, Seyssins (FR), May 2-4, 1994
Availability: Available from (1) as Paper EN 38186 ORA
Record Number: 199410552 / Last updated on: 1994-11-28
Original language: en
Available languages: en