Absolute differential cross sections at angles ranging from 10\ifmmode^\circ\else\textdegree\fi{} to 170\ifmmode^\circ\else\textdegree\fi{} and at bombarding energies of 5.6, 5.8, 6.0, and 6.2 MeV have been measured for the reaction ${\mathrm{Be}}^{9}$+${\mathrm{Li}}^{7}$, leading to each of the following states: ground and 0.75-MeV states of ${\mathrm{C}}^{15}$; ground, 6.10, 6.58 with 6.72, 6.89 with 7.01, 7.34, and 8.32-MeV states of ${\mathrm{C}}^{14}$; ground, 3.09, and 3.68 with 3.85-MeV states of ${\mathrm{C}}^{13}$; ground, 0.95, 1.64, and 2.62 with 2.72-MeV states of ${\mathrm{B}}^{12}$. The yields of the ${\ensuremath{\alpha}}_{0}$ and ${\ensuremath{\alpha}}_{2}$ groups at 20\ifmmode^\circ\else\textdegree\fi{} (lab) have been measured at 3.3 MeV and at eleven other energies ranging from 5.0 to 6.2 MeV. Absolute cross sections were obtained by comparison of the yields of reaction products to elastic Coulomb scattering. Comparison is made of the total cross-section values with the ($2J+1$) rule. The angular distributions for the ${t}_{0}$ and ${t}_{1}$ groups, at each of the bombarding energies, are compared with the predictions of a two-mode (pickup and heavy-particle stripping) direct-reaction process in the plane-wave approximation.

The radioactive decay of ${\mathrm{Se}}^{83}$ produced by ${\mathrm{Se}}^{82}(n,\ensuremath{\gamma})$ has been investigated experimentally, leading to a proposed level scheme for ${\mathrm{Br}}^{83}$. The half-life of the long-lived decay was determined to be 22.6\ifmmode\pm\else\textpm\fi{}0.2 min, and the 70-sec half-life of ${\mathrm{Se}}^{83m}$ was confirmed. For the long-lived decay, the various coincidence studies lead to a proposed decay scheme incorporating 29 $\ensuremath{\gamma}$ rays and involving excited levels in ${\mathrm{Br}}^{83}$ at 356, 801, 868, 1094, 1355, 1421, 1438, 1814, 2060, 2650, 2697, 2738, and 2777 keV. The 1094-keV level has been found to have ${T}_{\frac{1}{2}}=4.1\ifmmode\pm\else\textpm\fi{}0.1$ nsec. Although coincidence measurements have not been made in the study of the short-lived isomer, $\ensuremath{\beta}$-and $\ensuremath{\gamma}$-ray spectrum measurements lead to the placement of nine $\ensuremath{\gamma}$ rays in the proposed decay scheme, with excited levels at 356, 1032, 1063, 2022, 2054, and 2147 keV. $\mathrm{Log}\mathrm{ft}$ values, determined from the studies of $\ensuremath{\beta}$-ray spectra, have been used to limit spin and parity assignments for many of the levels, while lifetime and directional correlation measurements have provided further limitations on the assignments for a few levels.

The 10B(3He, pααα) reaction has been studied at bombarding energies of 2.45 and 6.00 MeV. These studies indicate that the 10B+3He system proceeds to the four-body final state pααα primarily by sequential decay processes. Evidence has been obtained for the occurence of the following energetically allowed processes: 1.(i) 10B+3He→p+12C, 12C→α1+8Be, 8Be→α2+α3,2.(ii) 10B+3He→α1+9B, 9B→p+8Be, 8Be→2+α3,3.(iii) 10B+3He→α1+9B, 9B→α2+5Li, 5Li→α3+p,4.(iv) 10B+3He→5Li+8Be, 5Li→p+α1, 8Be→α2+α3.

The angular distribution of the alpha particles from each of the reactions O17(He3, α0)O16, O17(He3,α0), O18(He3,α0) and O18(He3,α1)O17∗ has been measured over an angular range of 0–160° at thirteen values of incident energy between 2.68 and 6.47 MeV. The experimental results and a comparison of these results with the theoretical prediction of a plane-wave direct-reaction theory with two modes, pick-up and heavy particle stripping, are presented.