Quasi‐elastic scattering of 800 mev protons and the detection of alpha particle and deuteron clusters in nuclei

A survey of quasi‐elastic scattering of 800 MeV protons has been carried out at LAMPF using the high resolution spectrometer, and targets of 6Li, Li, 12C, 27Al, 40Ca, 51V, 90Zr, and Pb. Measurements were made at angles of 5°, 7°, 9°, 11°, 13°, 15°, 25° and 30°. Absolute cross sections were obtained using known (p,p) elastic cross sections. The momentum spectra were taken from the elastic region to well beyond the quasielastic peak. The variation in peak cross section and the FWHM of the peaks with mass number is reported. Evidence is presented for the quasielastic scattering of protons from clusters of mass 4 in the nucleus.