A Study of the Elastic Scattering of 2 to 3 MeV Neutrons by 40Ca and 32S Using an Associated Particle Time of Flight Spectrometer
An associated particle time of flight spectrometer based on the D(d,n)3He reaction has been developed using thin deuterated polythene targets. The competing D(d,p)3T was used to monitor the neutron output. The spectrometer has been used to study the elastic scattering of a 2 - 3 MeV neutrons in 40Ca and 32S; in each case the differential elastic scattering cross sections have been measured. In the angular range 20° - 100° in the laboratory frame of reference the results have been compared with an optical model analysis. Values of ¿2 per point of 3.46 and 2.84 for 40C and 32S respectively were obtained.
The calculation of neutron cross-sections from optical potentials
Abstract Neutron total and differential elastic scattering cross-sections for Si, S, Ca, Ti, Fe, Ba, Pb and U are calculated from generalized optical potentials and compared with experimental data. The potentials used are the local potential equivalent to the non-local potential of Perey and Buck and the neutron potential corresponding to the proton potential of Perey. In the former case satisfactory agreement with experiment is obtained. Simple formulae for optical potentials are given as a function of energy and mass number from which neutron cross-sections can be calculated from 1 to 15 MeV for medium and heavy nuclei.
Elastic scattering of 1 MeV neutrons
Abstract Differential elastic scattering cross-sections for 1 MeV neutrons have been measured for twenty elements using the time-of-flight technique. Ten rare earth elements were included to fill a large gap in previous data in an interesting region of mass number. The measurements have been individually corrected for flux attenuation and multiple scattering by a Monte Carlo method. The results are compared with the predictions of the Bjorklund-Fernbach optical model.