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HK: Hadronen und Kerne

HK 18: Kernspaltung, Kernreaktionen I

HK 18.5: Vortrag

Montag, 24. März 1997, 18:00–18:15, HS K

Measurement of the ²³⁸U(n,n’) cross section between 1.5 and 4 MeV — •C. Goddio, A.J.M. Plompen, and E. Wattecamps — JRC-Institute for Reference Materials and Measurements (IRMM), Retieseweg, B-2440 Geel, Belgium

Experiments are ongoing to determine the ²³⁸U(n,n’) cross section for incoming neutron energies from 1 to 4 MeV and excitation energies between 0.5 and 1.5 MeV. Neutrons are produced by the T(p,n)³He reaction at the 7 MV Van de Graaff accelerator. The neutron detectors are NE213 liquid scintillators placed at angles of 55^∘, 90^∘ and 125^∘. Neutron time of flight and pulse height spectra are recorded. Pulse shape analysis is applied. The normalization of the data is done relative to the elastic scattering cross section of ^natC for energies less than 2 MeV and to the well known n-p cross section at higher energies. Preliminary quantitative results will be presented and compared with current evaluated data files.