79. The use of zero energy scattering calculations in the selection of nuclear optical potentials

✍ Scribed by H.J. Amster

• Publisher: Elsevier Science
• Year: 1956
• Weight: 68 KB
• Volume: 22
• Category: Article
• ISSN: 0031-8914
• DOI: 10.1016/s0031-8914(56)90146-x

✦ Synopsis

ABSTRACTS

nuclei will be symmetric about 90 ° providing: the reaction goes through the compound nucleus (compound nucleus assumption), many overlapping levels are excited in the compound nucleus (continuum assumption), the phases of these levels are random (statistical assumption). The departure from symmetry of such angular distributions in situations where the continuum assumption is probably satisfied, is usually attributed to a violation of the compound nucleus assumption, but could also be due to a violation of the statistical assumption. It may be possible to distinguish between these alternatives by measuring angular distributions at several closely spaced bombarding energies. A sensitive dependence of the angular disbutions on bombarding energy would be difficult to explain if the departure from symmetry were due to a violation of the compound nucleus assumption, but would be easy to explain if the statistical assumption were violated. We have measured the angular distribution for 40A(p, p') 40A*, to the 1.47 MeV level, at bombarding energies of 9.8, 9.0, and 8.5 MeV. Significant changes in the asymmetric angular distributions are observed.