We propose an instability of a vortex array in the presence of axial normal-fluid flow in He II. This instability may be responsible for the influence of thermal counterflow on ion-trapping cross sections reported by Cheng, Cromar, and Donnelly.

Fluctuations in x-ray intensity from the ST tokamak show a characteristic sawtooth behavior. This behavior is identified as an internal disruption. The internal disruptions are preceded by growing sinusoidal $m=1\mathrm{}$, $n=1\mathrm{}$ oscillations. The properties of these oscillations are compared with predictions for the $m=1\mathrm{}$ internal kink mode.

Plasma vortex structures generated by conical theta-pinch guns have been successfully compressed and amplified by secondary adiabatic compression. A pair of vortex rings meet at the center of a primary magnetic mirror. A secondary mirror starts to compress them as soon as the collision has occurred. Peak ion temperatures of 170 eV have been obtained at an $n\tau$ of ${10}^{12}$ sec/${\mathrm{cm}}^3$ by utilizing a capacitor bank that stores 250 kJ.

It is known that parametric instabilities involving two coupled modes, with oppositely directed group velocities, saturate convectively if the medium is inhomogeneous. This work considers the modification of that result when weak long-wave turbulence is present, in addition to the background inhomogeneity. We find that the convective saturation disappears when the turbulence exceeds a certain level, absolute growth occurring instead.

The classical electron-ion collision rate, ${\nu }_{\mathrm{ei}}$, has been deduced in the absence of Ohmic heating from the inverse bremsstrahlung absorption rate measured on a laboratory plasma subjected to an intense microwave electric field $E$ whose frequency $\omega$ is near the electron plasma frequency ${\omega }_p$. The observations, carried out in the transition range, where $\frac{\mathrm{eE}}{\left(m\omega \right)}\approx {\left(\frac{k{T}_e}{m}\right)}^{\frac{1}{2}}$, yield a simple empirical relation that describes the decrease of ${\nu }_{\mathrm{ei}}$ with increasing $E$.

Measurements of the magnetoresistance of gold with rare-earth impurities show that the resistivity of a rare-earth impurity is different according to whether its magnetic moment is directed parallel or perpendicular to the current. The longitudinal resistivity is larger for Tb, Dy, and Ho and smaller for Er, Tm, and Yb; the anisotropy vanishes for Gd. This indicates that the resistivity anisotropy is due to the interaction of the conduction electrons with the electric quadrupolar moment of the $f$ electrons.

Direct determination of the lattice location of implanted deuterium in single-crystal chromium has been made for the first time. Ion-channeling measurements of the angular distributions along the $〈100〉$ axial and {100} planar directions indicate that implanted D occupies the octahedral position in bcc Cr. This contrasts to the expected tetrahedral interstitial position recently observed under the same conditions for bcc W. These results further clarify the apparent anomaly in the thermodynamic data for hydrogen solubility in Cr.

TICI and TIBr can be forced to crystallize in the NaCl structure by evaporation on alkali-halide substrates, whereas they usually grow in the CsCl structure. Optical measurements on fcc layers of TlCl and TlBr are described for the first time. They are in good agreement with relativistic band-structure calculations, which are also reported in this Letter. An order-of-magnitude enhancement of exciton binding energies is explained as a consequence of a change in the type of chemical bond.

A variety of anomalous properties of $A15\mathrm{}$ compounds can be explained by assuming that the perfect lattices become unstable at low temperatures, but are stabilized by small distortions around point defects which increase with decreasing temperature. In particular, the presence of vacancies explains discrepancies between sound-velocity measurements and recent lattice-constant measurements as a function of pressure.

The deuteron vector analyzing power in deuteron-proton elastic scattering has been measured at $E_d=45.4\mathrm{}$ MeV. Our results, when compared with recent three-body calculations, suggest the possibility of deducing information on the $n-p$ phase-shift parameters which has not been available from $n-p$ scattering itself.

Deuteron-breakup calculations are performed by using phase-equivalent potentials that differ off shell with and without the constraint of a fixed triton binding energy. This approach is compared with the previous work of Brayshaw. We examine various regions of phase space and energy between 14 and 65 MeV. Our results show that new off-shell information can be obtained from deuteron-breakup studies in the final-state region of phase space.

The dipole strength has been measured in ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ between 22- and 27-MeV excitation energy by inelastic scattering of 45- and 155-MeV protons. The dipole cross section is compared to the results of isovector-collective-model, distorted-wave Born-approximation calculations and to photonuclear experimental results.

We call attention to a feasible laboratory experiment with an outcome that depends necessarily on both Planck's constant and the gravitational constant. A neutron interferometer for which the two beams enclose an area of ~ 6 ${\mathrm{cm}}^2$ can be cut from a single crystal of silicon. A shift of ~ 10 fringes is anticipated when the interferometer is rotated 180° about an axis parallel to both the earth's surface and the incident neutron beam.

The charged particles associated with a fast forward trigger proton of four-momentum transfer $t$ in the reaction $p+p\to p+\mathrm{MM}$ at 28.5 GeV/c were measured using the Multiparticle Argo Spectrometer System. Charged-particle multiplicity distributions show multiplicity scaling with respect to the missing mass, MM, to ∼10% within each of two $t$ regions, $0<\mathrm{}\left|t\right|<2\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ and $3<\mathrm{}\left|t\right|<5\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. The width of the scaling curve shrinks between regions.

The hypothesis that the Higgs field has also a cosmological character is proposed. The experimental consequences are an upper limit on the mass of the scalar boson, $m_{\varphi }<4.6\mathrm{}\times {10}^{-27\mathrm{}}{m}_e$, and an implication that the universe will recontract.

A model of weak interactions mediated by scalar bosons $B^{\pm }$, $B^0$, and ${\overline{B}}^0$ is presented.

The cross section for radiative electron transfer from H atoms to bound states of an incident ion is calculated for velocities much greater than the orbital velocity of the captured electron. It is shown to dominate over the Coulomb-charge-exchange cross section for $E>\mathrm{}9\mathrm{}$ MeV per incident nucleon.

We have applied a recently developed method for sensitive calorimetric measurements to investigate the nematic—smectic-$A$ phase transition in pure N-$p$-cyanobenzylidene-$p-n$-octyloxyaniline. The results indicate a very weak first-order transition with a transition entropy of $(0.017\mathrm{}\pm 0.002)R_0$. The critical exponents of the specific-heat anomaly have nonclassical values $\alpha =0.16\mathrm{}\pm 0.01$ and ${\alpha }^{\prime }=0.14\mathrm{}\pm 0.02$.

We report the first observation of the anomaly in the real part of the refractive index of a critical binary fluid (methanol-cyclohexane). A theoretical relation was obtained for the refractive index of a binary mixture in the vicinity of its critical point which agrees with the experimental results within the experimental error. More precise experiments are in progress.

Onset phenomena in superfluid helium have been studied by measuring the rotational decay constant of a levitated, superconducting niobium sphere coated with an unsaturated superfluid film. The novel features of onset that were observed are discussed. Previous observations of a two-layer-thick solid phase of helium underlying the film have been confirmed.