Accurate differential cross sections have been measured at 90/sup 0/ for the reaction /sup 3/H(p,..gamma..)/sup 4/He at E/sub p/ = 8.34 and 13.6 MeV. Previously published results for both /sup 3/H(p,..gamma..)/sup 4/He and /sup 4/He(..gamma..,p)/sup 3/H are reviewed and compared with the present data. The theoretical implications of the results are briefly discussed.

The capture reaction $^{13}\mathrm{C}$($^{3}\mathrm{He}$,$\ensuremath{\gamma}$)$^{16}\mathrm{O}$ has been studied over an excitation energy range of 25 to 30 MeV in $^{16}\mathrm{O}$. The 90\ifmmode^\circ\else\textdegree\fi{} differential yield curve for the ground state transition shows resonances at ${E}_{x}=25.1, 26.0 \mathrm{and} 27.3$ MeV. The measured angular distributions are consistent with a spin and parity assignment of ${J}^{\ensuremath{\pi}}=1$--- to these states. The relation between this structure and that observed in the $^{15}\mathrm{N}$($p$,${\ensuremath{\gamma}}_{0}$)$^{16}\mathrm{O}$ reaction is discussed. The 90\ifmmode^\circ\else\textdegree\fi{} differential yield curves for the doublet transitions ${\ensuremath{\gamma}}_{1}+{\ensuremath{\gamma}}_{2}$ and ${\ensuremath{\gamma}}_{3}+{\ensuremath{\gamma}}_{4}$ were also measured. The former shows resonances at ${E}_{x}=26.0, 26.6, 27.2, 27.7, \mathrm{and} 28.6$ MeV, while the latter shows a broad resonance centered at ${E}_{x}\ensuremath{\simeq}27.5$ MeV with mild structure. Both curves suggest the existence of giant resonance strength built on the excited states of $^{16}\mathrm{O}$.NUCLEAR REACTIONS $^{13}\mathrm{C}$($^{3}\mathrm{He}$,$\ensuremath{\gamma}$)$^{16}\mathrm{O}$, $^{\mathrm{E}}3_{\mathrm{He}}$ = 3.0-8.5 MeV, measured $\ensuremath{\sigma}({\mathrm{E}}_{^{3}\mathrm{He}},{\mathrm{E}}_{\ensuremath{\gamma}},\ensuremath{\theta})$. $^{16}\mathrm{O}$ deduced resonances and structure in giant resonance region. Enriched $^{13}\mathrm{C}$ target.

The (p, pn) reaction on 2H, 6Li, 7Li, 9Be has been studied at 47 MeV bombarding energy. Excitation energy spectra and energy sharing spectra are presented. Fragmentary information on 10B, 11B and 12C was also obtained. Sequential decay contributions to the 6Li(p, pn)5Li∗ reaction suggest an admixture of parentage (α)π(p12)π(d52) for the (3−), 23 MeV excited state of 6Be. A possible 15.5 MeV excited state in 6Be is reported. An extensive study of the 9Be (p, pn)8Be reaction for 45 MeV protons was made. Results for θp = θn = 25°, 30°, 35°, 40°, 45°, 55°, 65°; θn = 40°, θp = 25°, 30°, 35°, 40°, 45°, 55°, 65°; θp/θn = 40°/45°, 38.5° are reported and compared to DWIA calculations. Agreement is good when the lower momentum components of the wave function are sampled, and deteriorates as higher momenta are required. Results are in agreement with the Cohen and Kurath spectroscopic factors for 9Be.

The $^{2}\mathrm{H}(p,2p)n$ reaction has been investigated under the special kinematic condition that the neutron is at rest in the center of mass. A comparison of experiment and theory is used to examine the significance of the spectral structure observed for such collinearity conditions.NUCLEAR REACTIONS $^{2}\mathrm{H}(p,pp)$, $E=23$ MeV; measured $\ensuremath{\sigma}({\ensuremath{\Omega}}_{1},{\ensuremath{\Omega}}_{2},{E}_{1})$ collinear conditions. Faddeev calculation, two potentials.

The 14C(τ, γ)17O radiative capture reaction has been studied for 3He bombarding energies from 3.2 to 7.5 MeV, corresponding to excitation energies in the compound nucleus 17O from 21.4 to 25.0 MeV. Absolute differential cross sections for the ground state and first excited state transitions have been measured. Both electric dipole (E1) and electric quadrupole (E2) radiations have been observed. Resonances in 17O at excitation energies of 21.7±0.1, 22.1 ±0.1, 22.6±0.2, and 23.0±0.1 MeV have been found and assignments Jπ = 52+, 72−, 32−, and 12+,respectively, have been determined. In addition, two more resonances at excitation energies of 23.5±0.1 and 24.4±0.1 MeV have been observed. These results are compared with other experiments.

The angular distribution of the $^{3}\mathrm{H}(p,^{3}\mathrm{He})n$ reaction cross section is measured at ${E}_{p}=13.6,14.8,18.0,21.0,24.0,27.0,30.0, \mathrm{and} 32.8$ MeV with an estimated absolute uncertainty of 8%. Such data are necessary in the study of quasifree processes, which frequently are hampered by the lack of cross-section data of the corresponding free processes. Normalization to existing ${E}_{p}=13.6$-MeV data shows that the $^{3}\mathrm{H}$ content of the target is 1.7 times less than given by the supplier. Using these new measurements, the $^{3}\mathrm{H}$ + $^{3}\mathrm{He}$ and $^{3}\mathrm{H}$ + $^{2}\mathrm{H}$ quasifree reactions are reanalyzed.[NUCLEAR REACTIONS $^{3}\mathrm{H}(p,^{3}\mathrm{He})$, $E=13.6\ensuremath{-}32.8$ MeV; measured $\ensuremath{\sigma}({E}_{p};\ensuremath{\theta})$. Determined $^{3}\mathrm{H}$ content of target, reanalyzed $^{3}\mathrm{H}$ + $^{3}\mathrm{He}$, $^{3}\mathrm{H}$ + $^{2}\mathrm{H}$ quasifree reactions.]