QUASI-FREE SCATTERING OF 1.0GEV PROTONS BY NA-23, SI-28, SI-29, SI-30, P-31, S-34, AND K-39 NUCLEI

The (p, 2p) and (p, 2p) and (p, pn) reactions on Na-23, Si-28, Si-29, Si-30, P-31, S-34, and K-39 nuclei were investigated by using the 1.0 GeV proton beam of the SPINP synchrocyclotron as a source of protons. Kinematically complete sets of measurements were carried out with the help of a correlation missing-mass spectrometer with approximately 3.5 MeV FWHM total resolution. Various Skyrme-Hartree-Fock effective nucl eon-nucleon potentials and a phenomenological axially-deformed potenti al of a mean field of a nucleus were used to analyze the experimental data. The deformation parameters and the quadrupole moments of the pro ton and the neutron component of nuclear density are determined by fit ting calculated single particle spectra of neutrons and protons to mea sured spectra. In contrast to other investigated nuclei with 2s-1d she lls, nuclei of silicon isotopes were found to be of oblate shape. The deformation effects are small in the K-39 nucleus, which can be consid ered as virtually spherical.