Proton inelastic scattering on $^{34}$Si and $^{32}$Mg.

The inelastic scattering of $^{34}$Si and $^{32}$Mg on a liquid hydrogen target was measured in inverse kinematics at energy of about 64 MeV/nucleon. In combination with B($E2$) values obtained from Coulomb excitation experiments$^{1,2)}$, information on the collective motions of the protons and neutrons can be studied separately. Experiment was performed at the RIPS beam line in RIKEN. A recently developed time-of-flight spectrometer and a NaI(Tl) array (DALI2) were used for particle identification of scattered particles and for $\gamma$-ray detection, respectively. De-excitation $\gamma$ rays from known 2$^+$ states and other higher states are clearly observed in $\gamma$-ray spectra for both nuclei. Deduced (p,p') cross sections from ground state to the 2$^+$ states are compared with those of the Coulomb excitation to study the neutron and proton quadrupole matrix elements. \\ {\bf References}\\ 1) R.~W.~Ibbotson et al., Phys. Rev. Lett. {\bf80}, 2081 (1998).\\ 2) T.~Motobayashi et al., Phys. Lett. B {\bf 346}, 9(1995).\\