Investigation of the Excited States of40Ca by the (p, p') Reaction at 185 MeV

Abstract

In an experiment on inelastic scattering of 185 MeV protons from ⁴⁰Ca differential cross sections have been determined for scattering from individual excited states of the target nucleus. The measurements have been extended over the angular range 4° to 40° (lab. system), and the results are presented in the form of angular distributions of the most prominent peaks in the energy spectra. The identification with known states of ⁴⁰Ca is made by the determination of the excitation energy, and, in the cases where the energy resolution (approximately 250 keV, FWHM) is not sufficient, by the shape of the angular distributions. The results are compared with previously published measurements on other nuclei at the same incoming proton energy as well as with inelastic scattering data at lower energies. In particular, it is shown that the results on the two closed-shell nuclei ¹⁶O and ⁴⁰Ca are very similar and that these nuclei behave differently from other 1p- and 2s-1d shell nuclei studied.