We report measurements of the longitudinal NMR resonance in the $A$ phase of liquid ${\mathrm{He}}^3$ on the melting curve below 2.7 mK, and show them to be consistent with that phase being the state proposed by Anderson and Brinkman. Strong field dependence of the $B$-liquid transverse NMR line shape, including the existence of a broad high-frequency tail, is presented and interpreted as domain effects in a Balian-Werthamer state. Absorption in the longitudinal mode in the $B$ phase is also reported.

The thickness of a flowing He II film has been measured at temperatures below 1°K. The film's thickness varies quadratically with the flow velocity, in agreement with theory. The implications of this observation are discussed with regard to similar measurements performed at higher temperatures.

Bound- and virtual-state structure has been observed in the tunneling characteristics of thick Cd films deposited over Pb. We observed amplitude effects displaying a temperature dependence not previously reported. An important point is made concerning basic spacings of bound and virtual levels. Amplitudes and level spacings appear to contain retrievable proximity-effect information. Taking nonlinear effects into account, a value of $v_{\mathrm{F}}=1.30\mathrm{}\times {10}^8$ cm/sec is obtained for the $c$ direction.

The sticking coefficients $s$ of ${\mathrm{H}}_2$, ${\mathrm{D}}_2$, ${\mathrm{N}}_2$, CO, and ${\mathrm{CO}}_2$ have been measured as a function of angle of incidence on the (100) and (110) planes of W. $s$ generally increases towards grazing incidence as predicted by a classical model involving energy dissipation by phonon production. However for ${\mathrm{H}}_2$ and ${\mathrm{D}}_2$ on W(110), $s$ decreases markedly towards grazing incidence. This suggests the existence of a threshold for energy transfer.

We suggest that it is the interaction of interstitial cation defects with the strain field they induce which is primarily responsible for the phase transition to the cation disordered state of the superionic conductor. This idea is developed in terms of a simple model that yields an analytic solution for the phase transition and relates the necessary strength of the interaction to anomalously large free volumes of cation interstitial formation.

The particle release from cold-rolled niobium surfaces under 14-MeV-neutron impact to a total dose of 4.6 × ${10}^{15}$ neutrons/${\mathrm{cm}}^2$ was investigated under ultrahigh-vacuum conditions and at ambient temperature. The type and amount of material released and deposited on a substrate surface was determined independently by four analytical techniques. Surprisingly, there were two types of deposits—one in the form of large chunks, the other a more even layer covering the surface. The chunk emission cannot be explained by existing neutron-sputtering theories.

Recent measurements of ${\mathrm{He}}^3$ and ${\mathrm{He}}^4$ monolayer heat capacities allow a comparison of the isotope shift of Debye temperature in two- and three-dimensional solid helium. The shift in films is greater than the $m^{-\frac{1}{2}}$ dependence of harmonic solids, increasing strongly with compression. In three dimensions the ratio is nearly harmonic and the density effect is much weaker. The differences are ascribed to steric hindrance of short-range dynamic correlations.

A new type of trial function is introduced which explains both the large deviations from Matthiessen's rule observed for the low-temperature electrical resistivity of the polyvalent metals, as well as the absence of such deviations for the alkali metals. Excellent quantitative agreement between theory and experiment is obtained for the resistivity of aluminum, both as a function of temperature and as a function of residual resistivity.

The singular behavior of the susceptibility ${\chi }_T\left(\overrightarrow{\mathrm{Q}}\right)$ near wave vector $\overrightarrow{\mathrm{Q}}=0\mathrm{}$, which is characteristic of long-range dipolar interactions, has been observed in a neutron-scattering study of ${\mathrm{LiTbF}}_4$. Quantitative agreement with mean-field theory is obtained at temperatures $2<\mathrm{}\frac{T}{T_c}<10\mathrm{}$. In a rather broad critical region, $0.01<\mathrm{}\frac{T}{T_c}-1<1\mathrm{}$, the divergent part of ${\chi }_T\overrightarrow{\mathrm{Q}}$ follows a power law $\frac{{\chi }_T(Q_x\to 0)}{\chi _T^{}{}_{}{}^0}=C{(1-\frac{T_c}{T})}^{-\gamma }$ with $C=1.25\mathrm{}\pm 0.13$ and $\gamma =1.13\mathrm{}\pm 0.06$.

The effect of uniaxial stress on the high-field magnetoresistance anisotropy of iron is measured and shown, by a combination of group theory and a band-structure interpolation scheme, to correspond to the origin of the (100) open orbits being magnetic breakdown between the hole octahedron and the electron jack on the minority-spin Fermi surface.

We use Regge-pole states for the distorted waves in a transfer reaction and compare the results with data showing the forward-angle anomaly.

A new method is presented for solving the singular integral equations that arise in the Faddeev theory of three-particle scattering. The method is tested by means of an example and found to be practical.

A doublet at 4.5-MeV excitation energy in ${}_{}{}^{18}{}_{}{}^{}\mathrm{Ne}$ has been studied via the reactions ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}({}_{}{}^3{}_{}{}^{}\mathrm{He},n){}_{}{}^{18}{}_{}{}^{}\mathrm{Ne}$ and ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}\mathrm{}(p,t)\mathrm{}{}_{}{}^{18}{}_{}{}^{}\mathrm{Ne}$. The states are found to have excitation energies of 4.518±0.008 and 4.590±0.008 MeV with spin and parity $1^{-}$ and $0^{+}$, respectively. The difference between the excitation energy of the $0^{+}$ state and that of the analogous state at 5.34 MeV in ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ gives strong evidence for the predominantly $s_{\frac{1}{2}}^{}{}_{}{}^2$ character of the state.

The Coulomb interaction is subtracted from the proton-proton scattering data in the ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$ partial wave. Contrary to traditional belief, the resulting nuclear effective-range parameters depend strongly on the unknown nuclear potential at small distances. The comparison between proton-proton and neutron-neutron data is therefore ambiguous.

As a consequence of local excitation, an asymmetry with respect to the leading particle in peripheral production processes is predicted. It is interpreted in terms of heat propagation in hadronic matter.

We report results of a molecular-beam magnetic-resonance study of the paramagnetic Van der Waals molecule KAr. The experiment yields a value for the spin-rotation interaction $\hslash \gamma \overrightarrow{\mathrm{S}}·\overrightarrow{\mathrm{N}}$, where $\hslash \overrightarrow{\mathrm{S}}$ and $\hslash \overrightarrow{\mathrm{N}}$ are, respectively, the electronic and rotational angular momentum. The average spin-rotation constant in KAr is $\overline{\gamma }=0.24\mathrm{}\left(1\right)\mathrm{}$ MHz.

This study elucidates the role played by implanted argon in the production of Ar $L$, non-characteristic, and Si $K$ x rays during 270-keV argon bombardment of silicon carbide.

The high-resolution Mössbauer effect of the 13.3-keV transition $\tau =4.3\mathrm{}$μsec) in ${}_{}{}^{73}{}_{}{}^{}\mathrm{Ge}$ has been observed in transmission experiments at room temperature. The recoilless $\gamma$-ray source was carrier-free ${}_{}{}^{73}{}_{}{}^{}\mathrm{As}$ diffused into a single crystal of elemental germanium; the absorber was a thin single-crystal layer of enriched ${}_{}{}^{73}{}_{}{}^{}\mathrm{Ge}$ epitaxially grown on a silicon substrate. The resonance absorption line, recorded with an electromechanical velocity spectrometer, has a corrected depth of ∼ 2.0%, and a (full width at half-maximum) linewidth $2\Gamma$ of 47(7) μm/sec, which is ∼ 7 times the natural linewidth. Despite the broadening this is the narrowest Mössbauer resonance observed so far at room temperature.

The partition function for a two-dimensional plasma is evaluated within the random-phase approximation. The periodic boundary conditions are taken fully into account by including the periodic image interactions. In the guiding-center limit, the "negative temperature" threshold energy is evaluated, and a value different from previous calculations results. When an identical random-phase evaluation is applied to the finite-gyroradius plasma, the Salzberg-Prager-May equation of state is recovered.

Space- and time-resolved interferometric measurements of electron density in a C${\mathrm{O}}_2$-laser-produced plasma in helium show the development and evolution of radial profiles with on-axis minima, resulting in self-focusing of the laser beam.