The total cross sections for production of $A_1$ and $A_2$ mesons produced in 16-GeV/c ${\pi }^{-}p$ interactions are presented together with angular distributions for their decay. An attempt has been made to treat the $A_2$ as a superposition of two resonant states.

A model for estimating continuum contributions to vector-meson propagators is constructed and used to predict the rate of vector-meson decay into lepton pairs, and a modification of the SU(3) prediction for the rate of $\varphi$ decay into $K+\overline{K}$. We also compare the pion electromagnetic form factor obtained in our model with that determined by the Novosibirsk group using the reaction $e^{+}+e^{-}\to {\pi }^{+}+{\pi }^{-}$.

It is conjectured that the Adler-Fubini sum rule does not necessarily hold in a world where the Schwinger term is finite and the propagator of the isospin current has a convergent spectral representation. A modified sum rule is proposed.

A class of possible experiments which are not of the asymptotic scattering type are described. Use is made of the Einstein time dilatation to slow down the internal processes of an hadronic system so that it may be probed at controllable times.

We propose an expression for calculating Regge-cut contributions to inelastic scattering, based on the absorption model. We present a brief justification of our expression, using the idea of an instantaneous composite structure for the scattering particles. We apply the model to $\rho$ exchange in ${\pi }^{-}p\to {\pi }^{0}n$.

Arguments are presented in favor of $B=0\mathrm{}$ enhancements in the 10, 10*, and 27 representations of SU (3) which decay mainly into a baryon and an antibaryon.

${\rho }^0$ production and decay are examined, particularly for ${\Delta }^2<{\mu }^2$. The implications of the results regarding Chew-Low extrapolation procedure, and regarding a conspiracy interpretation, are discussed.

Diamagnetic shielding factors for a number of atoms and ions are evaluated using relativistic electron theory in the Hartree-Fock-Slater approximation. The results agree well with previous nonrelativistic values for light atoms but include relativistic corrections which rise to 62% for Hg.

Neutron scattering from liquid helium at large energy and momentum transfers was found to be qualitatively consistent with an independent particle model. No evidence for a sharp peak related to the occupation of the zero momentum state was observed but, from the temperature dependence of the width, a value of (17 ± 10)% for the population of this state was deduced. Possible evidence for vortex creation accompanying the scattering process was obtained.

Turbulent heating has been applied to plasmas of density ${10}^{11}$ to 5 × ${10}^{13}$ ${\mathrm{cm}}^{-3\mathrm{}}$ in a bumpy torus for the purpose of observing afterglow confinement. An rf electric field of up to 250 V/cm ringing at 1 Mc/sec was induced parallel to the axis for 1 μsec. The plasma was observed to remain in confinement for several microseconds after current cutoff, the initial $\mathrm{nT}$ being as high as (5-7) × ${10}^{15}$ eV ${\mathrm{cm}}^{-3\mathrm{}}$.

It was recently suggested that the metal-nonmetal transition which occurs in ${\mathrm{Fe}}_3$${\mathrm{O}}_4$ at ≃120°K may be of the Mott-Wigner type. Present results on the effects of pressure on the transition temperature and the conductivity of the low-temperature phase are consistent with such a model. ${\mathrm{Fe}}_3$${\mathrm{O}}_4$ may thus be the first material in which such a transition has been observed.

Oscillations periodic in an energy equal to that of the LO phonon have been observed in the excitation spectrum for the bound exciton complexes in ZnSe and CdS. The data is interpreted in terms of direct or phonon-assisted generation of free excitons and subsequent creation of bound exciton complexes.

A transition believed to carry $4f$ electrons of Gd from bound to virtual levels in Ag-Al and Cu-Al alloys has been observed by means of the solvent Knight shift.

The longitudinal magnetoresistance was measured along the [100] direction of a pure single crystal of copper. The temperature dependence of the saturation ratio, $\frac{\rho (B=\mathrm{sat}.)}{\rho \mathrm{}(B=0\mathrm{})\mathrm{}}$, is given between 4 and 35°K. A limit is placed on the diffusion approximation for small-angle electron scattering and it is suggested that the assumption of a relaxation time or of a mean free path parallel to the velocity is not valid for some types of impurity or low-temperature phonon scattering.

The first ultraviolet measurements of the complex polar Kerr effect (rotation and ellipticity) are reported between 1.8 and 5.5 eV for the rare-earth orthoferrites. The resonances observed are identified as charge transfer or charge-transfer-enhanced crystal-field transitions associated with octahedrally coordinated ${\mathrm{Fe}}^{3+}$ ions.

A horizontal magnetically suspended simple pendulum undergoes anomalous viscous damping nearly two orders of magnitude larger than observed in an identical vertical pendulum in a comparable magnetic field. A mathematical analysis of the experimental results infers that the energy losses are induced by gravity.

Experimental data on the propagation characteristics of a sound wave which couples mechanical and electric displacements are obtained and analyzed to yield the polarization relaxation time and the dielectric susceptibility as a function of temperature in both the paraelectric and ferroelectric regions. The results are compared with the results of other types of measurements and related to a previously described model of ferroelectricity in this crystal.

Ferroelectric properties in gadolinium molybdate are shown to originate from a new mechanism completely different from that in conventional ferroelectric materials. In this crystal the spontaneous polarization results from an elastic instability which gives rise to a spontaneous strain in the original piezoelectric paraelectric phase. The dielectric permittivity of the clamped crystal ($\epsilon _{33}^{}{}_{}{}^x$) is low and independent of temperature, while the elastic constant ($c_{66}^{}{}_{}{}^E$) shows a strong temperature dependence with a marked anomaly at the Curie point.

The tetragonal rotation of Ti${\mathrm{O}}_6$ octahedra in SrTi${\mathrm{O}}_3$ and the trigonal rotation of Al${\mathrm{O}}_6$ octahedra in LaAl${\mathrm{O}}_3$ were measured by paramagnetic resonance below their respective phase transitions. The normalized rotation angles $\alpha$ vary quantitatively in the same way as a function of reduced temperature. Thus $\alpha$ is the order parameter in such transitions, which are characteristic for perovskite compounds.