Quasielastic knockout of alpha clusters from light and medium nuclei by 600 MeV protons

Abstract

Knockout of $\ensuremath{\alpha}$ clusters from light and medium weight nuclei by 600 MeV protons has been investigated. The outgoing protons and $\ensuremath{\alpha}$ particles were detected in coincidence; their momenta were measured with two large magnetic spectrometers with proportional wire chambers. Experimental methods which were used to work with a high beam rate and an efficient proton rejection in the $\ensuremath{\alpha}$ arm are described. Separation energy spectra are given for $^{6}\mathrm{Li}$, $^{7}\mathrm{Li}$, $^{12}\mathrm{C}$, $^{24}\mathrm{Mg}$, $^{27}\mathrm{Al}$, and $^{40}\mathrm{Ca}$ nuclei. A peak is observed at an excitation energy equal to zero, except for the $^{27}\mathrm{Al}$ target.NUCLEAR REACTIONS $^{6}\mathrm{Li}$, $^{7}\mathrm{Li}$, $^{12}\mathrm{C}$, $^{24}\mathrm{Mg}$, $^{27}\mathrm{Al}$, $^{40}\mathrm{Ca}(p, p\ensuremath{\alpha})$, ${E}_{0}=600$ MeV; experimental methods; separation energy spectra.