The quasi-elastic scattering (QES) process has been studied for the (p, n) reaction at 300 and 400 MeV. Energy spectra for targets ranging from 2H to natPb have been obtained for a wide range of scattering angles corresponding to momentum transfers q = 1.0 - 2.4 fm-1. Energy shift of the QES peak from that of 2H to higher excitation energy is observed for all targets studied, with a gradual increase with target mass reaching almost a constant value of ∼26 MeV beyond 12C. The mass dependence oo the effective neutron number (Neff) for the (p, n) QFS process is well represented by Neff = 0.85N0.5 over a wide mass range from 2H to natPb except for 6Li, 7Li and 9Be which deviate significantly. The analyzing powers of the QES peak region for the 12C and 40Ca targets are compared to those of the 2H(p, n) reaction at 300 and 400 MeV and found to be almost identical for q ≤ 1.5 fm-1. Transverse polarization transfer coefficients at 0 degree DNN(0°) have been measured for the 1p shell nuclei at 300 MeV. Large negative DNN(0°) values are observed for the continuum region up to an excitation energy of 50 MeV irrespective of targets. The DNN(0°) values observed for the GT transitions are around -0.28 which indicates the contribution from the tensor interactions. The DWIA calculations well reproduce the observed DNN(0°) values.
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