The differential cross section for $K^{-}-\alpha$ elastic scattering for $K^{-}$ laboratory momenta in the interval 110-160 MeV/c has been measured in a helium bubble chamber. The data, together with measurements of the total absorption cross section in the same region, have been fitted with a partial-wave analysis involving $s$- and $p$-wave scattering with complex phase shifts. These parameters are used for predicting the expected results of a $K$-mesonic x-ray experiment, viz., that >98% of the $K^{-}$ capture is from the $2P$ state.

Phonon dispersion relations along $\left[10\mathrm{}\overline{1}0\right]$ in the hcp phase of ${\mathrm{He}}^4$ have been determined by triple-axis neutron spectrometry. Optical as well as acoustic branches were observed at 27 atm and 0.99°K in a single crystal grown from the superfluid phase.

In plasma stability calculations, one usually neglects the dispersion of the velocities of particle drifts in a curved magnetic field. If the dispersion of curvature drift velocities is taken into account, the low-frequency electrostatic drift instabilities driven by a density gradient are stabilized by ion Landau damping in the direction of the curvature drift. Examples of marginal stability curves demonstrate the importance of this effect.

The repulsive $\delta$ interaction problem in one dimension for $N$ particles is reduced, through the use of Bethe's hypothesis, to an eigenvalue problem of matrices of the same sizes as the irreducible representations $R$ of the permutation group $S_N$. For some $R\text{'}\mathrm{s}$ this eigenvalue problem itself is solved by a second use of Bethe's hypothesis, in a generalized form. In particular, the ground-state problem of spin-½ fermions is reduced to a generalized Fredholm equation.

Nuclear orientation experiments on ${}_{}{}^{54}{}_{}{}^{}\mathrm{Mn}$ in copper indicate an anomalous low-temperature susceptibility for very dilute CuMn alloys. This is interpreted in terms of a Kondo condensation with $T_{\mathrm{K}}$ about 0.06°K.

The recent observation of a peak of scattered radiation at the plasma frequency from thin metal foils irradiated with light can be explained in terms of a small amount of surface roughness of the foils.

We describe a theory of nonlinear interactions in an imperfect, bounded, quantum plasma. We consider the yield of photons from both $s$- and $p$-polarized photon bombardment of a plasma slab, and application to the experiments on plasma resonance excited by light first performed by Brambring and Raether.

The observed depression of $T_c$, as determined by resistivity measurements, and the anomalous critical-current behavior of superconducting microbridges is explained as resulting from fluctuations in the phase of the Ginzburg-Landau order parameter, leading to degradation of off-diagonal long-range order.

The divergence of the temperature coefficient of resistivity of nickel at the Curie temperature is emphasized. Application of the modified Ornstein-Zernike spin-pair correlation function is shown to yield results which cannot be made consistent with both resistivity and susceptibility results.

The $J$ dependence for $l=1\mathrm{}$ nucleon-transfer reactions at an incident-deuteron energy of 23 MeV is qualitatively reproduced by distorted-wave claculations. Considerably greater damping of contributions from the interior of the nucleus is required than previously thought necessary in ($d, p$) reactions. This may imply that the energy dependence of the real potential for protons is stronger than the dependence previously obtained for neutrons.

A small but well-defined resonance was found in ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$ near the predicted $T_{>}$ component of the giant dipole resonance.

The problem of obtaining a satisfactory Regge-pole model for the pion-exchange reactions $\mathrm{np}\to \mathrm{pn}$, $\pi N\to \rho N$, $\pi N\to \rho N^{*}$, $\gamma p\to {\pi }^{+}n$, and $\overline{p}p\to {\overline{N}}^{*}{N}^{*}$, is discussed with particular emphasis on the dynamics as seen in the $s$ channel. It is pointed out that (i) satisfactory models can be obtained using a modified conspiracy model; (ii) pion exchange should provide the dominant contribution to the forward cross sections for incident momenta up to 30-50 GeV/c; and (iii) the energy dependence of the differential cross sections should change from that characteristic of pion exchange for $t\sim 0$, to that characteristic of the exchange of vector or tensor mesons at large momentum transfers $t\lesssim -0.5\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$.

Recent experiments indicate that the ${\mathrm{N}}_2$-C${\mathrm{O}}_2$ near-resonant vibration-transfer cross section has a strong negative temperature dependence for temperatures below about 1000°K, in contrast to the behavior predicted by the theory of Schwartz, Slawsky, and Herzfeld. It is shown that this anomalous behavior is due to the long-range dipole-quadrupole interaction between the molecu