The effects of thermal fluctuations on the dc Josephson effect are examined experimentally through measurements of the current-voltage characteristic. The results are compared with a calculation due to Ambegaokar and Halperin which uses an analogy with the Brownian motion of a particle in a field of force.

Magnetoelastic waves in the flopped antiferromagnet CsMn${\mathrm{F}}_3$ are observed by the parallel-pumping technique. From the magnetic field positions of the shear-wave and longitudinal-wave interactions and from the measured sound velocities the following values are deduced for the nearest-neighbor antiferromagnetic exchange constants in CsMn${\mathrm{F}}_3$: $J_1=3.5\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$ and $J_2=3.2\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$. A reinterpretation of the magnon-sideband data observed by Saito in CsMn${\mathrm{F}}_3$ is possible using the above exchange constants.

The polarization of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ nuclei elastically scattered from ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ has been measured. Absolute polarization values are determined from three asymmetries measured at appropriate energies and angles using double-scattering techniques. A polarization angular distribution at 13-MeV ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ energy indicates general agreement with previously reported phase shifts.

The angular distribution of a ($p, p^{\prime }$) resonance reaction leading to an excited $J_f=0\mathrm{}$ target state allows an unambiguous determination of the spin of the resonance. As an example we investigate isobaric analog resonances in ${}_{}{}^{95}{}_{}{}^{}\mathrm{Nb}$ decaying to the 1.30-MeV $0^{+}$ state in ${}_{}{}^{94}{}_{}{}^{}\mathrm{Zr}$ and discuss the weak-coupling nature of their parent states in ${}_{}{}^{95}{}_{}{}^{}\mathrm{Zr}$, based upon the spin assignments made.

The ferromagnetic phase boundary and intrinsic neutron spin polarization are calculated as a function of the strength and range of the neutron forces, and the density of the neutron liquid. This system is discussed within the context of neutron stars.

Evidence is presented for the existence of a boson resonance with mass $M=1695\mathrm{}\pm 20$ MeV and width $\Gamma =90\mathrm{}\pm 20$ MeV. It decays principally into $\omega \rho$ and $\omega \pi \pi$ and has $G=-1\mathrm{}$ and $I=1\mathrm{}$. This state can be interpreted either as a new resonance, further complicating the $R$ region, or as an alternative decay of the $\pi \mathrm{}\left(1640\right)\mathrm{}$; the latter would require an $\frac{\omega \pi \pi }{f\pi }$ branching ratio greater than 4.

Enhancements in the $A$ region and at 1.670 GeV are observed decaying into $\pi \rho$. The $A_1$ enhancement is not well described by a simple charge-exchange Deck effect. The isoscalar character of the 1.670-GeV enhancement is confirmed.

Muon-proton elastic scattering has been studied in the range $0.15<\mathrm{}{q}^2<0.85\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ with ${\mu }^{+}$ and ${\mu }^{-}$ beams of 6 and 11 GeV/c and a ${\mu }^{-}$ beam of 17 GeV/c. Cross sections have been determined with uncertainties as small as 2%. Rosenbluth straight-line plots and comparisons of the ${\mu }^{+}$ and ${\mu }^{-}$ cross sections show no deviation from the one-photon exchange approximation.

Measurements of the $\mu -p$ elastic cross section in the range $0.15<\mathrm{}{q}^2<0.85\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ are compared with similar $e-p$ data. We find an apparent disagreement between the muon and electron experiments which can possibly be accounted for by a combination of systematic normalization errors.

An attempt has been made to detect possible existence of a new neutral hyperon by studying both the missing-mass system and the $\Lambda \gamma$ system. Our result does not warrant the necessity of introducing any new hyperon near the mass of $\Lambda$, although it is not sensitive enough to dismiss the possibility entirely.

It is shown that the algebraic realization of chiral symmetry in which one assigns the mesons to a representation of the chiral algebra is not consistent with the Veneziano model.

In the Veneziano model, at large $s$ and fixed $t$, the $s$-channel resonances sum to give $\Gamma (1-\alpha \mathrm{}(t\left)\right){\mathrm{}(-s)\mathrm{}}^{\alpha \mathrm{}\left(t\right)-1\mathrm{}}$ and the $u$-channel resonances sum to $\Gamma (1-\alpha \mathrm{}(t\left)\right)s^{\alpha \mathrm{}\left(t\right)-1\mathrm{}}$. Using this feature, we propose a new interference model for intermediate energies which gives a significantly improved fit to the backward ${\pi }^{-}p$ data, and we make comments on the Schmid Argand loops.

It is suggested that antiprotons could be used to test Condo's conjecture that the large mean cascade time for $K^{-}$ mesons in atomic orbits in liquid helium is due to metastable states.

Resonance effects between the ($3{}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{}-3\mathrm{}{}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}$) levels in hydrogen atoms were observed by passing a beam of fast moving hydrogen atoms through spatially periodic potential barriers and causing velocity-dependent frequency tuning. The resonances permit the determination of level separations.

The temperature dependence of the diffusion coefficient in phenol-water has been measured by analysis of scattered light. The data are compared with measurements in other liquid mixtures and pure fluids, and attention is drawn to interesting similarities.

A linear parametrization of the equation of state near the critical point, proposed by Schofield, is tested. From the available experimental data in the critical regions of a number of magnets (Cr${\mathrm{Br}}_3$, Ni, Gd) and fluids (${\mathrm{Co}}_2$, Xe, ${\mathrm{He}}^4$) we find evidence of systematic deviations from an assumption of linearity.

It is shown that even when explicit exchange interactions are unimportant, electron spin waves can exist in nonmagnetic conductors due to spin-orbit coupling and the longrange self-consistent field of the electrons.

The gradual merger as a function of temperature of two Van Hove critical points of the same phonon band can give rise to a stronger singularity in $g\left(\omega \right)$. This leads to an anomaly in $C_V$ typical of second-order phase transition. The phenomenon of leveling off of phonon bands can be observed in the case of $\beta$-brass.

It is suggested that the cone-to-spiral magnetic transition in holmium metal near 20°K is caused by a soft spin-wave mode of nonzero wave vector. Neutron inelastic scattering measurements are presented which support this proposal.

We have measured the temperature dependence of the electrical resistivity of the cubic, Laves-phase, ferromagnetic, intermetallic compounds Gd${\mathrm{Ni}}_2$, Gd${\mathrm{Pt}}_2$, and Gd${\mathrm{Rh}}_2$, and for Gd${\mathrm{Ni}}_2$, we have analyzed the temperature derivative of the electrical resistivity in the neighborhood of the magnetic transition. Above the Curie temperature our data are very well described by the molecular-field treatment of the long-range spin fluctuations of the short-range order, giving for the first time an experimental result in agreement with this treatment.