Measured ${\mathrm{A}1\mathrm{}}^{27}$ nuclear spin-lattice relaxation times in superconducting $\mathrm{Al}\mathrm{Mn}$ alloys deviate from the law of corresponding states predicted from the theory of pair weakening by nonmagnetic resonant $3d$ impurity states. The results indicate appreciable broadening of the superconducting quasiparticle excitation spectrum by the Mn impurities.

A 75-keV electron beam with a low angular divergence (8×${10}^{-6\mathrm{}}$ rad) combined with a Wien filter spectrometer is used to examine the dispersion of radiative surface plasmons in thin oxidized aluminum films. The measurements agree with theory, provided the effect of the oxide layer is included.

Measurements of the conductivity of single-crystal TTF-TCNQ are reported for pressures 0-20 kbar and temperatures 20-273°K. The metal-insulator transition temperature increases about 1°K/kbar. The conductivity at 273°K increases by a factor of 4.5 at 20 kbar, while the peak conductivity near the metal-insulator transition remains independent of pressure. These results are discussed in terms of current models describing the properties of TTF-TCNQ.

The zero-field critical behavior above $T_c$ of ferromagnets (or ferroelectrics) with a Hamiltonian of cubic symmetry is studied, in $d$ space dimensions, in the limit of infinite spin dimensionality, $n\to \infty$, with the cubic term of order unity, but the usual $S^4$ term of order $n^{-1\mathrm{}}$. A diagrammatic expansion about an Ising model (instead of the normal Gaussian model) is used. Characteristic cubic behavior is discovered, with renormalized Ising-model exponents (in the Fisher sense).

The polarization of chromium in a magnetic field is found to be of $3d$ electronic character. The data are best fitted by having a 60%-orbital-40%-spin contribution of the $3d$ electrons to the static magnetic susceptibility both above and below the antiferromagnetic transition temperature. The orbital contribution to the static magnetic susceptibility was found to be (98±3)×${10}^{-6\mathrm{}}$ emu/mole. No evidence has been found of a well-defined localized spin above the antiferromagnetic transition temperature.

We study near $T_c$ the correlation function $〈{\sigma }_{00}{\sigma }_{\mathrm{MN}}〉$ of the two-dimensional Ising model.

A generalized duality argument, similar to the treatment of the two-dimensional Ising model by Kramers and Wannier, is used to locate the transition temperature of the eightvertex model in three dimensions.

It is demonstrated that nonorthogonality effects can play a very important role in multistep processes involving successive particle-transfer reactions. This is shown for the particular example of the $({}_{}{}^3{}_{}{}^{}\mathrm{He}, d)-(d, t)$ process, where nonorthogonality terms can be included as a renormalization of the effective interaction for the direct (${}_{}{}^3{}_{}{}^{}\mathrm{He}$ $t$) charge-exchange process.

We construct a simple optical potential for nucleus-nucleus processes by a folding method. With these potentials, we have obtained high-quality fits to a variety of elastic-scattering data. We also successfully reproduce one-particle transfer data. However, two-particle transfer results may indicate the need for further refinements of the model. In addition, we calculate the bound states of an $\alpha$+${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ folded potential. There is good agreement with experimental energies and $\alpha$ widths for two $\alpha$-cluster bands in ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$.

Directional correlations of the strongly hindered 501-keV $\gamma$ ray with subsequent 332-and 215-keV $\gamma$ rays from polarized ${}_{}{}^{180m}{}_{}{}^{}\mathrm{Hf}$ showed an average time-reversal-invariance-violating asymmetry of (2.8±5.1) × ${10}^{-4\mathrm{}}$, indicating no substantial effect. The phase angle between the 501-keV $E3\mathrm{}$ and $M2\mathrm{}$ components was $sin\eta =+0.048\mathrm{}\pm 0.087$ and the out-of-phase components of the multipole matrix elements were, respectively, (+1.1±2.1) × ${10}^{-6\mathrm{}}$ and (-2.1±3.8) × ${10}^{-9\mathrm{}}$ Weisskopf units.

The level structure of ${}_{}{}^{188}{}_{}{}^{}\mathrm{Os}$ and ${}_{}{}^{190}{}_{}{}^{}\mathrm{Os}$ has been investigated by the ($p, t$) reaction at 19.0-MeV proton energy. New $0^{+}$ states were seen at 1480 and 1705 keV in ${}_{}{}^{188}{}_{}{}^{}\mathrm{Os}$ and at 1551 and 1734 keV in ${}_{}{}^{190}{}_{}{}^{}\mathrm{Os}$. Additional evidence is presented for describing the lowest excited $K=0\mathrm{}$ and $K=4\mathrm{}$ bands as two-phonon $\gamma$ vibrations.

We have made a measurement of the lepton charge asymmetry in ${K_L}^0$ decays. Magnetic analyses of the decay products in a spectrometer using multiwire proportional counters allowed kinematic reconstruction of the event where the particles traversed only 293 mg of matter. The leptons were differentiated from the pions only through their different transverse-momentum distributions. The asymmetry was measured to be (3.33 ± 0.50) × ${10}^{-3\mathrm{}}$, in accord with the superweak description of $\mathrm{CP}$ nonconservation.

We have measured the charge asymmetry in ${K_{e3\mathrm{}}}^0$ decay and searched for variations in the asymmetry across the Dalitz plot. Aseribing any variation to a $T$-noninvariant form factor, we find $\mathrm{Im}\lambda =0.001\mathrm{}\pm 0.025$. The integrated asymmetry is $\frac{(N^{+}-N^{-})}{(N^{+}+N^{-})}=(3.18\mathrm{}\pm 0.38)\times {10}^{-}$.

We present measurements of the invariant cross section for the inclusive reaction $p+p\to p+X$ in the region $0.14<\mathrm{}\left|t\right|<0.38\mathrm{}$ ${\mathrm{GeV}}^2$, $100<s<\mathrm{}750\mathrm{}$ ${\mathrm{GeV}}^2$, and $0.80<x<\mathrm{}0.93\mathrm{}$.

We present an analysis, in the framework of the triple Regge model, of our recent experimental results on the reaction $p+p\to p+X$ between 50 and 400 GeV.

We report observation of the $S^{*}$ meson in the reaction ${\pi }^{-}+p\to S^{*}+n$. The $S^{*}$ decays into $\pi \pi$ and $\mathrm{KK}$ and is seen most clearly in the $2{\pi }^0$ channel. A fit to the data gives a sheet-II pole at $987\pm 7-i(24\pm 7)$ MeV and a relative coupling $\frac{g_{S\to \mathrm{KK}}}{g_{S\to \pi \pi }}$ of 3.8 ± 1.0.

We have measured the central part of the Balmer ${\mathrm{H}}_{\beta }$ or ${\mathrm{D}}_{\beta }$ line in similar stabilized arc plasmas, but of different chemical compositions. We have found an ion-motion effect which appears to scale with the inverse square root of the reduced mass of the radiator-perturber system and which, for ${\mathrm{H}}_{\beta }$ at least, essentially removes one of the largest remaining discrepancies between experiment and Stark-broadening theory.

The classical theory for the scattering and absorption of electromagnetic radiation by a homogeneous isotropic sphere is extended so as to apply to a sphere in which dispersive plasma oscillations exist. Computations performed for small metallic spheres predict the appearance of an absorption structure in the frequency region just above the plasma frequency.

I discuss soundlike collective excitations in anisotropic superfluid Fermi liquids in both the collisionless and the hydrodynamic regimes. Expressions for the velocities of zero, first, second, and fourth sound are derived in terms of the Landau parameters of the normal state. The second- and fourth-sound velocities are found to vary appreciably with orientation.

A novel experimental technique has been used to study how charge carriers in superfluid helium produce quantized vortex rings. Measurements taken over a wide range of temperature, pressure, and ${\mathrm{He}}^3$ impurity concentration reveal several new features of the vortexring transition, and indicate that some commonly made assumptions about the nature of the transition may need revision.