Elastic Neutron Scattering at 96 MeV

International audienceA facility for detection of scattered neutrons in the energy interval 50-130 MeV, SCANDAL (SCAttered Nucleon Detection AssembLy), has recently been installed at the 20 - 180‐MeV neutron beam line of The Svedberg Laboratory, Uppsala. Elastic neutron scattering from 12C, 16O, 56Fe, 89Y, and 208Pb has been studied at 96 MeV in the 10 - 70° interval. The results from 12C and 208Pb have recently been published,6 while the data from 16O, 56Fe, and 89Y are under analysis. The achieved energy resolution, 3.7 MeV, is about an order of magnitude better than for any previous experiment above 65 MeV incident energy. The present experiment represents the highest neutron energy where the ground state has been resolved from the first excited state in neutron scattering. A novel method for normalization of the absolute scale of the cross section has been used. The estimated normalization uncertainty, 3%, is unprecedented for a neutron‐induced differential cross section measurement on a nuclear target. The results are compared with modern optical model predictions, based on phenomenology or microscopic theory. Applications for these measurements are nuclear‐waste incineration, single‐event upsets in electronics, and fast‐neutron therapy. © 2005 American Institute of Physic

Elastic scattering of 96 MeV neutrons from iron, yttrium, and lead

Data on elastic scattering of 96 MeV neutrons from 56Fe, 89Y, and 208Pb in the angular interval 10-70° are reported. The previously published data on 208Pb have been extended, as a new method has been developed to obtain more information from data, namely to increase the number of angular bins at the most forward angles. A study of the deviation of the zero-degree cross section from Wick's limit has been performed. It was shown that the data on 208Pb are in agreement with Wick's limit while those on the lighter nuclei overshoot the limit significantly. The results are compared with modern optical model predictions, based on phenomenology and microscopic nuclear theory. The data on 56Fe, 89Y, and 208Pb are in general in good agreement with the model predictions

Elastic neutron scattering at 96 MeV from 12^{12}C and 208^{208}Pb

A facility for detection of scattered neutrons in the energy interval 50-130 MeV, scattered nucleon detection assembly, has recently been installed at the 20-180 MeV neutron beam line of The Svedberg Laboratory, Uppsala. First results on elastic neutron scattering from 12C and 208Pb at 96 MeV incident neutron energy are presented. This experiment represents the highest neutron energy where the ground state has been resolved from the first excited state in neutron scattering. The results are compared with modern optical model predictions