We report the observation of electronic Raman scattering from phosphorus donors and boron acceptor impurities in silicon. We find that the most important intermediate states involve interband transitions, and that this has important consequences for the intensity of the scattering. We also report observation of phonon-Raman scattering involving creation of one zone-center optical phonon with subsequent decay through the anharmonic interaction into two acoustic phonons.

Energy spectra have been measured at 15 scattering angles for ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ ions arising from the triton bombardment of ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$. A peak which appeared in the spectra at all scattering angles is attributed to the ground state of ${}_{}{}^7{}_{}{}^{}\mathrm{He}$. The $Q$ value of the reaction ${}_{}{}^7{}_{}{}^{}\mathrm{Li}(t, {}_{}{}^3{}_{}{}^{}\mathrm{He}){}_{}{}^7{}_{}{}^{}\mathrm{He}$ corresponds to ${}_{}{}^7{}_{}{}^{}\mathrm{He}$ being unbound to neutron decay by 0.42±0.06 MeV. The width of the state was determined to be 0.17±0.04 MeV.

The quark is probably unstable with respect to strong interactions. It is possible that the stable particle with nonintegral charge has a charge $\mathrm{}\left|Q\right|>\frac{2}{3}$.

Exact sum rules to investigate singularities in the complex angular momentum plane are obtained.

A set of $s$-wave phase shifts in the region of the $\rho$ is deduced from a compilation of data on $\pi -\pi$ scattering. Our results indicate slowly varying $I=2\mathrm{}$ and $I=0\mathrm{}$ $s$-wave phase shifts. The preferred set indicates that the $I=0\mathrm{}$ phase shift might go through 90° in the neighborhood of 850-950 MeV.

We study the dynamics of positive-parity excited baryon states with a bootstrap model involving high-spin baryons. A spectrum of broken SU(2)⊗O(3) multiplets is implied by the calculation.

Measurements of the drift velocity and the ratio of diffusion coefficient to mobility have been made for electrons in parahydrogen at 77°K. The differences in the transport coefficients in normal hydrogen and parahydrogen demonstrate the influence of the difference in the statistical weights of the rotational levels in the two gases.

The electrical resistivity of large single crystals of 99.9999+% gallium has been found to exhibit anomalous behavior near 1.7°K. The temperature at which the anomaly occurs decreases extremely rapidly with increasing magnetic field. Measurements were made with currents as small as 0.005 A, using a potentiometric system with ${10}^{-15\mathrm{}}$-V sensitivity.

Acoustoelectric current saturation has been observed in single crystals of trigonal selenium. The hole drift mobility and its temperature dependence have been determined from this phenomenon. No evidence of a hopping mechanism is found.

The response of a two-dimensional electron gas to a longitudinal electric field of arbitrary wave vector and frequency is calculated in the self-consistent-field approximation. The results are used to find the asymptotic screened Coulomb potential and the plasmon dispersion for a plane of electrons imbedded in a three-dimensional dielectric.