Differential cross sections and analyzing powers for the <(p)over right arrow p> --> d pi(+) reaction have been measured to within T-pi(cm) = 85 keV of threshold. The S-wave strength is extracted and found to be similar to 13% larger than that determined from recent measurements of np --> d pi(0). Both the analyzing power and the anisotropy in the angular distribution show the expected energy dependence and these data are used to obtain values for the two contributing P-wave amplitudes.

The polarized target asymmetry A(N) for pi(-)(p) over right arrow-->gamma n has been measured by coincident detection of the gamma and the neutron at several angles across the Delta resonance energy region. A high-resolution NaI gamma spectrometer together with good time-of-flight information for the neutron resulted in excellent separation of this radiative capture reaction from the much higher cross-section charge exchange reaction pi(-)(p) over right arrow-->pi(0)n. Statistical uncertainties are Delta A(N) = 0.02 - 0.04, representing a significant improvement over previous results. The new data are discussed in the context of recent theoretical models.

Total cross sections and angular distributions for the differential cross section and analyzing power of the reaction H-2(p over arrow pointing right, pi-0)He-3 have been measured at four energies very near threshold (0.1 < T(pi)c.m. < 2.7 MeV). The large asymmetries observed in the angular distributions of the differential cross section indicate strong constructive interference between the amplitudes for s-wave pion emission and the amplitudes for p-wave emission. A measure of the s-wave strength at zero energy is obtained and found to be consistent with the results from pionic atoms. The new data indicate that the excitation function for this reaction differs significantly from that of p + n --> d + pi-0.

We report a first measurement of the spin-correlation parameter A(zz) in neutron-proton scattering at 67.5 MeV. The results, obtained in the angular range 105-degrees less-than-or-equal-to theta-c.m. less-than-or-equal-to 170-degrees with typical accuracies of 0.008, are highly sensitive to the 3S1-3D1 mixing parameter epsilon-1. A phase-shift analysis based on the current world data yields a value of epsilon-1 significantly higher than predicted by modern potential models.

Abstract Inclusive ( π , π ′) and exclusive ( π , π ′p) for π ∓ scattering on 3 He has been measured, at incident energies of 170, 220, 270, 320 MeV and angles of 45° to 135°. The data are compared with a DWIA calculation. The role of multistep reactions is investigated.

We have measured inclusive (π, π′) and (π, π′ p) cross sections on 3He for a large range of angles and energies across the (3,3) resonance. The data show a clear signature of pion multistep processes, which can be identified via comparison of single arm data, coincidence data and DWIA calculation.