INCLUSIVE (P,N) AND (HE-3,T) REACTIONS ON NUCLEI IN THE QUASI-ELASTICAND DELTA-ISOBAR EXCITATION REGION

Starting from a formalism of effective numbers for the inclusive integ ral cross sections of the (p, n) reaction with the formation of quasi- elastic and DELTA-isobar nuclear excitation we obtain, without free pa rameters, a satisfactory quantitative description of existing experime ntal data. The theory gives a factorized form, which allows for a usef ul separation of the reaction mechanism and the structure of the light and heavy reaction partners. The use of this formalism has been succe ssful only with heavy reaction partners and with only minor modificati ons of the (He-3, t) reactions at intermediate energies. It is argued from the similarity of the cross sections for the (p, n) and (He-3, t) reactions obtained by removing the form factors of He-3 from the cros s sections and by bringing the experimental data for different energie s to the same energy. It is shown that the reaction mechanism for the (p, n) and (He-3, t) processes is, in principle, essentially the same.