The complete $3^{-}$ part of the $S$ matrix for ${\mathrm{O}}^{16}$ has been computed in the one-particle, one-hole approximation. In the continuum states the isospin invariance is totally broken; analogous partial cross sections for protons and neutrons show large differences.

The predicted capture rate in the ${\mathrm{Cl}}^{37}$ experiment for detecting solar neutrinos is calculated using the results of recent nuclear experiments and solar-model investigations. It is shown that additional experiments (e.g., with ${\mathrm{H}}^2$, ${\mathrm{Li}}^7$, ${\mathrm{B}}^{11}$, or $\nu -e$ scattering) are necessary to establish the relative contributions of the proton-proton chain and the CNO cycle to solar energy generation.

Calculations using improved element abundances and atomic photoelectric cross-section data indicate sizable interstellar x-ray absorption edges at 0.532 and 0.874 keV due to $K$-shell photoionization of O and Ne, respectively. Results are applied to recent and prospective observations.

Using the algebra of currents, we study the renormalization effects on the meson-baryon coupling constants, due to SU(3) breaking.

Any physically meaningful attempt to find a simple Lie group of rank three, containing among its generators a part of the charge which commutes with $C_{\mathrm{st}}$ and containing SU(3) as a subgroup, is shown to imply the existence of fractionally charged particles. Conjugation with $C_{\mathrm{st}}$ is not an automorphism of such a group and its extension by the group made up of $C_{\mathrm{st}}$ and ${C_{\mathrm{st}}}^2=E$ is shown to be impossible. The combination of the simple rank-three Lie group with $C_{\mathrm{st}}$ does not lead to a finite-dimensional semisimple Lie group in the neighborhood of the identity.

The spin-2 nonet is described by SU(6) 405 wave functions that are eigenstates of the number of strange quarks. The decay branching ratios are obtained by a rearrangement of the quarks and antiquarks into two quark-antiquark pairs without change of quantum numbers, after an appropriate spin recoupling.

Structure has been observed in the energy-loss spectrum of 60-MeV ${}_{}{}^{127}{}_{}{}^{}\mathrm{I}$ ions and 3-MeV $\alpha$ particles channeled in gold single crystals. The explanation of this structure has been found to lie in the nature of transverse oscillations of the particles in the channels. The energy losses associated with given wavelengths and amplitudes allow a mapping of the stopping power in the channel and should permit the direct determination of inter-atomic potentials.