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The cross sections and analyzing powers of the 16O(p,p′)16O(0-,T = 1) scattering were measured at a bombarding energy of 295 MeV and an angular range of 14° ≤ θlab ≤ 30°. The isovector 0- state at Ex = 12.80 MeV is clearly separated from the neighboring states with an energy resolution of ΔE ≃ 30 keV. The data have been compared with distorted wave impulse approximation (DWIA) calculations. The analyzing powers are sensitve to the effective nucleon-nucleon (NN) interaction used in DWIA calculations, and our data support the medium modification of the NN interaction in nuclei. The DWIA calculation employing a random phase approximation (RPA) response function predicts an enhancement of the cross sections around a momentum transfer of q ≃ 1.7 fm-1, and it gives a reasonable agreement with the data. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

The cross sections and analyzing powers were measured for 3He+12C, 58Ni, and 90Zr elastic scattering at T3He=450 MeV. The incident energy dependence of the volume integral per nucleon for 3He shows the similar behavior to that of protons if the spin-orbit potential is taken into account. This result supports the assumption that interactions between 3He and nucleus are dominated by the interactions between constituent nucleons of 3He and target nucleus in the intermediate energy region. The results of the single folding calculation suggest the interaction between point nucleon and target nucleus is modified in the 3He+nucleus elastic scattering. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

The results of experimental studies of three-nucleon systems will be presented, i.e. the pvector d elastic scattering at Ep = 250 MeV and the dvector p → 3He+γ capture reaction at Ed = 200 MeV. The angular distributions of the cross section and all the proton spin observables were measured for elastic scattering, and the cross section and analyzing powers, Ay, Axx and Ayy for the capture reaction. The results are compared with theoretical predictions based on exact solutions of the three-nucleon Faddeev equations and modern realistic nucleon-nucleon potentials combined with three-nucleon forces. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Cross sections, analyzing powers and spin rotation parameters of proton elastic scattering from 58Ni and 120Sn have been measured at intermediate energies. Obtained data have been analyzed in the framework of relativistic impulse approximations. In order to explain the 58Ni data, it was necessary to modify NN interactions in the nuclear medium by changing coupling constants and masses of σ and ω mesons. For 120Sn, by assuming the same modification of NN interactions and by using proton densities deduced from charge densities, the neutron density distribution was searched so as to reproduce 120Sn data at 300 MeV. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

We have measured polarizations P of outgoing protons in (p, 2p) reactions at an incident energy of 1 GeV for three kinds of targets. The experimental result shows a distinct reduction from IA calculation values using NN interaction in free space and the reduction is found to be monotonic to the effective mean density estimated with DWIA. This is consistent with the previous result obtained at 392 MeV, though the incident energy is quite different. We have also measured an angular distribution of the polarization for 12C target. All of the data, including both for forward nd backward outgoing protons, show similar reduction from the IA calculation, though, again, outgoing energies are quite different from 130 MeV to 890 MeV. From these results, it is concluded that these reductions are nuclear structure or interaction originated and not caused by the reaction mechanism such as multi-step processes or distortions. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]