Gross Structure in (d, p) Reactions nearZ=50

Abstract

Proton spectra from ${\mathrm{Sn}}^{120}(d, p){\mathrm{Sn}}^{121}$ and ${\mathrm{In}}^{115}(d, p){\mathrm{In}}^{116}$ at 19.7 Mev are presented, covering 6.5 Mev of excitation in the product nucleus and laboratory angles from 15° to 155° at 10° intervals. The reactions are closely similar in all characteristics. Broad energy groups are discussed relative to the correlation with neutron single-particle states anticipated by a giant-resonance interpretation of their nature. Of four such groups identified, the spectral locations of three agree quantitatively with the single-particle level scheme deduced from binding-energy data. A group at 0.8 Mev, while consistent with single-particle gross structure, may represent a distinct nuclear level enhanced for reasons not clear. Angular distributions for the several groups fail to show the strong minima characteristic of pure stripping forms, probably as a consequence of the spreading of single-particle levels resulting from finite nuclear distortion which also weakens the spectral gross structure. However, the slight structure which the distributions do display is qualitatively consistent with stripping peak positions consequent on the single-particle interpretation of the spectra.