Abstract
Results of the first experimental search for the excitation of discrete final states following exclusive (,p) reactions are reported. The measurements include differential cross section at ° for (,p) reactions on , , , and at =120 MeV and (,p) on at =145 MeV. The (,p) reactions yield peaks with dσ/dΩ≤1 μb/sr compared to 7–22 μb/sr for peaks from (,p) reactions. The shape of the continuum in an excitation energy range of 10–40 MeV was found to be independent of pion charge and target. The ratios of (,p)/(,p) averaged over excitation energy and the ratios of the same reaction on different nuclei are presented. The magnitude of the proton yield in the low excitation continuum is more than 20 times larger for than for , which supports a two-nucleon absorption model including pion charge exchange.
- Received 22 December 1986
DOI:https://doi.org/10.1103/PhysRevC.35.1567
©1987 American Physical Society