Observations and calculation of the "$\frac{10}{3}$ effect" in ${\mathrm{C}\mathrm{u}\left(\mathrm{N}{\mathrm{H}}_3\right)}_4$S${\mathrm{O}}_4$ · ${\mathrm{H}}_2$O confirm a non-Gaussian form for one-dimensional spin time correlation functions.

The quasielastic scattering of 4.1-Å neutrons from liquid argon at 94±2°K has been studied for wave-vector transfers in the region $1.3 {\AA }^{-1\mathrm{}}<Q<\mathrm{}2.6\mathrm{} {\AA }^{-1\mathrm{}}$ which covers the main peak in the liquid structure factor. The peak intensity and peak width exhibit the same type of oscillatory behavior as observed earlier in other coherently scattering liquids. A simple modification of Vineyard's convolution approximation is described by which these oscillations are quantitatively explained.

Direct observations are reported of the electron velocity distribution throughout the region traversed by a magnetic shock wave in a plasma. In one case, the electron heating rate is greater than 10 times that predicted from normal and compressional effects.

We have found direct evidence of upward, phonon annihilation, processes in the decay patterns of two metastable states ${}_{}{}^5{}_{}{}^{}D_0^{}{}_{}{}^{}\left(14\mathrm{}542 {\mathrm{cm}}^{-1\mathrm{}}\right)$ and ${}_{}{}^5{}_{}{}^{}D_1^{}{}_{}{}^{}\left(15\mathrm{}878 {\mathrm{cm}}^{-1\mathrm{}}\right)$ of BaClF: ${\mathrm{Sm}}^{2+}$. Under pulse excitation, the decay curve of the ${}_{}{}^5{}_{}{}^{}D_1^{}{}_{}{}^{}$ fluorescence includes a long tail, with a time constant equal to the lifetime of ${}_{}{}^5{}_{}{}^{}D_0^{}{}_{}{}^{}$, which appears at ∼280°K and grows in intensity with temperature; finally at ∼400°K both states decay with the same time constant. This finding is consistent with the thermal dependence of the ratio of the intensities of the ${}_{}{}^5{}_{}{}^{}D_1^{}{}_{}{}^{}$ to the ${}_{}{}^5{}_{}{}^{}D_0^{}{}_{}{}^{}$ flourescence.

Two-photon measurements were done on single crystals of CuCl at 20°K in an energy range from 3.2 to 4.3 eV. For the first time sharp exciton lines are found in a two-photon spectrum. A detailed study of the polarization dependence yields symmetry assignments of the exciton states.

The Mössbauer effect of the 21.7-keV $\gamma$ line of ${\mathrm{Eu}}^{151}$ has been employed to study the isomer shifts and the magnetic fields in Eu-Yb alloys. From these measurements the conduction-electron contribution to the hyperfine field at the Eu atom in Eu metal due to its own $4f$ electrons and due to its neighboring atoms can be deduced. In addition an explanation is given for the apparent lack of conduction-electron contribution to the observed hyperfine field in metallic Gd.

It is shown that in the absence of direct reactions, the averages of the diagonal elements of the pole-residue matrices $-i{\mathrm{G}}_{\mu }$ of the $S$ matrix (sometimes called partial widths) satisfy $\frac{2\pi {〈G_{\mu \mathrm{cc}}〉}_{\mu }}{D}=\frac{\exp \left(2i{\xi }_c\right)T_c}{{(1-T_c)}^{\frac{1}{2}}},$ where $D$ is the average pole spacing, $T_c$ is the optical-model transmission coefficient, and ${\xi }_c$ is the real part of the optical-model phase shift.

A free-fall technique has been used to measure the net vertical component of force on electrons in a vacuum enclosed by a copper tube. This force was shown to be less than $0.09mg$, where $m$ is the inertial mass of the electron and $g$ is 980 cm/${\sec }^2$. This supports the contention that gravity induces an electric field outside a metal surface, of magnitude and direction such that the gravitational force on electrons is cancelled.

It is shown that the Mandelstam cut mechanism, which allows the existence of fixed poles at negative values of angular momentum, is not sufficient to allow the Pomeranchon to have zero slope. It is suggested that this fact makes it unlikely that the Pomeranchon is a fixed pole.

We compute the on-mass-shell electromagnetic mass difference ${\mu }_{{\pi }^{+}}-{\mu }_{{\pi }^0}$, in a model consistent with chiral-algebra constraints and partial conservation of axial-vector currents, and find it to be logarithmically divergent. Some implications of this result are discussed.

An analysis of the $A_1$ and the $\rho$ decays is made using current algebra, partial conservation of axial-vector currents, and dispersion relations; the pions are treated as "soft" in the sense $K^2\to 0$ instead of $K\to 0$ which is usually assumed.

The $f^{*}$ meson was observed, with a partial cross section of 14±4 μb, in the reaction $K^{-}+p\to \Lambda +f^{*}$, at 5.5 GeV/c. Its mass was measured as 1515±7 MeV, with a width of 35±25 MeV, considerably narrower than previously measured. The decay into $K\overline{K}$ was the dominant mode, with no significant evidence for decay into $\pi \pi \eta$, $\pi \pi$, $K^{*}\overline{K}$, or ${\overline{K}}^{*}K$. The production and decay angular distributions are presented and analyzed in terms of the spin-density matrix formalism.