Differential Cross Sections and Exchange Effects in the Reaction F19(d,n)Ne20
Abstract
Angular distributions of neutrons from the reaction F19(d,n)Ne20 in the ground and first excited states have been measured at deuteron bombarding energies of 1.0, 1.5, 2.0, 2.2, and 2.5 MeV. Excitation functions at 0° were measured in 100-keV steps from 0.9 to 2.7 MeV. The differential cross section for production of first-excited-state neutrons was measured to be 7.4+/-0.8 mb per steradian at 0° with a beam energy of 2.00 MeV. A single stilbene crystal employing pulse-shape discrimination was used to detect the neutrons. The angular distributions were analyzed in terms of a dual-mode plane-wave theory which formally incorporates exchange and interference terms. It is found that the gross features of the distributions as a function of energy can be qualitatively accounted for by this model. Both excitation functions exhibit fluctuations which include a broad peak at 2 MeV that also appears to be present in the total cross section for the first-excited-state neutrons. It is tentatively proposed that this suggests the presence of groups of closely spaced levels of unusually high excitation of Ne21.
- Publication:
-
Physical Review
- Pub Date:
- November 1966
- DOI:
- 10.1103/PhysRev.151.834
- Bibcode:
- 1966PhRv..151..834W