Electron-induced proton knock-out from 30Si, 31P and 32S

Abstract

Electron-induced proton knock-out from the isotones 30Si, 31P and 32S is studied. The extracted r.m.s. radii of the bound-state wave functions, momentum distributions and spectral functions are presented and the systematics are discussed. The momentum distributions and r.m.s. radii for knock-out from the 2s12 and 1d52 orbitals are found to be similar for all three isotones. The 2s12 orbit is filled smoothly in going from 30Si to 32S, but it is neither completely empty nor completely filled in 30Si and 32S, respectively. The experimental results are compared to shell-model calculations and to the results of a quasi-particle phonon model calculation. Although the distribution of spectroscopic strength as a function of energy can be reproduced reasonably well by the latter model, its value, integrated up to 24 MeV excitation energy, is not compatible with the model value.