The Nucleon-Nucleon Interaction and Nucleon-Nucleus Scattering

Scattering of Electrons, Nucleons, and Pions as Probes of Nuclear Structure

“…Other interesting examples of p� and p}+ differences deduced from pion inelastic scattering studies have been discussed recently (182)(183)(184)(185). The studies of the high spin "stretched" excitations emphasize the importance of conventional confi guration mixing effects since only 15-25% and 30-50% of the T = 0 and T = 1 single-particle-hole strength is observed experimentally (32,34,35,106,108,(174)(175)(176)(177)(182)(183)(184)(185) and the effects of the A are not important for high angular momentum transfer (168)(169)(170).…”

“…This requires that we introduce the simplest local forms for the projectile-nucleon coupling interactions that are consistent with the usual invariance considerations, make the Born approximation, and work in a Cartesian representation for the various transition densities that enter the problem. Specifically, in the remainder of this paper we include terms in the electron-nucleon interaction associ ated with the finite size of the nucleons and keep terms to order (11M2) in the reduction of the nucleon current (7, 102-105); assume a local nucleon nucleon interaction with central, spin-orbit, and tensor components (31)(32)(33)(34)106); and consider a local pion-nucleon interaction with the usual central and spin-orbit components (29,32,77) plus additional current coupling components associated with the actual nonlocality of the central interaction components (79,80). The knockout exchange amplitudes for nucleon-nucleus scattering are treated approximately (38).…”

“…Experimental studies of the population of unique high spin isovector "stretched" particle-hole states via (p, p') and (p, n) provide important information on /lsl / at q � 2 fm -I, where the tensor part of the isovector spin-dependent interaction is dominant (32,34,35,106,174,175). For these transitions p} .L = [(J+ 1)jJ] 112pVI and p� = 0, to a very good approxi mation, and p} .L can be fixed from inelastic electron scattering data.…”

“…Section 3 highlights the many-body theory behind the hadron-nucleon effective interactions employed in this work. Some readers may wish to skip directly to Section 4, where we introduce local models fo r these hadronic effective interactions and employ a simple Born picture (20,(30)(31)(32)(33)(34)(35), which allows us to display compactly and com pare the properties of the interactions for all three probes and to delineate the primary spectroscopic features of the scattering of each. We summarize some of the specifi c results that have been obtained to date in Sections 5 and 6, emphasizing typical cases that refl ect the wide range of spectroscopic information available in the experimental data and indicate some of the major directions in this fi eld of study.…”

“…Gamow-Teller and Ml Ex citations Experimental information on ll ll, fl� , and l� at low q is obtained from the study of isobaric analog (IA) and Gamow-Teller (GT) transitions with known f3-decay matrix elements via the (p, n) reaction at 0° (32,34,35,113). It is the central components of the isovector spin-dependent inter action that are most important here.…”