The effects of a weak force between nucleons can be studied directly through the scattering of longitudinally polarized nucleons on nucleons. We use distorted-wave theory to predict the dependence of the differential and total cross sections on the helicity of longitudinally polarized protons for elastic proton-proton scattering up to ∼300 MeV. The weak force used is parametrized by ${\rho }^0$, ${\omega }^0$, and two-pion exchanges.

We introduce a new technique which we use to analytically compute six graphs contributing to the magnetic moment of the electron in sixth order.

An $n$-component classical spin system with arbitrary pair interactions, or a lattice field theory, is considered, in arbitrary dimensionality $d$, with spin weighting factor $\exp [-w(s^2\left)\right]$, or equivalently local interactions satisfying $w\left(y\right)=\mathrm{O}\left(y^{m^{+\delta }}\right)$ as $y\to 0$ with $m=1,2,\dots \mathrm{and} \delta >0\mathrm{}$. Analytic continuation in $n$ is defined and used to show that for $n=-2k$ with $k=1,2,\dots ,m$ the zero-field free energy and all isotropic correlation functions and cumulants take their Gaussian (or free field) values.

We have identified a slow-mode shock wave in a laboratory experiment. We also present a model of the novel method of launching the shock.

Two modes were excited by applying oscillating currents to a small coil surrounding a plasma column in a single-ended $Q$ machine. One of them had the same dispersion relation as grid-excited waves, beyond about half a wavelength from the exciting position. The other was an electrostatic ion cyclotron wave propagating along a magnetized plasma column.

We have measured the correlation range for fluctuations of the orientational order parameter in the isotropic phase of the liquid crystal $p$-methoxy benzylidene, $p-n$ butyl aniline (MBBA). The correlation range was found to diverge as ${(T-T_c*)}^{\frac{-1\mathrm{}}{2}}$, in agreement with the predictions of de Gennes. This result is in contradiction with the behavior reported by Chu, Bak, and Lin.

The diamagnetic transition of ensembles of single-crystal aluminum particles with radii less than the superconducting coherence length ${\xi }_0$ has been measured over a wide range of temperature, field, and average radius. The particles are sufficiently small that the Ginzburg critical region is experimentally accessible. Fluctuation effects are observed inside and outside this critical region. The data agree with recent exact theoretical calculations based on the Ginzburg-Landau functional.

We present a classical effective-medium theory for the magnetoconductivity tensor in disordered materials which undergo a metal-nonmetal transition via a microscopically inhomogeneous transport regime.

We propose the existence of an inhomogeneous transport regime in the disordered materials in which a gradual metal-semiconductor transition occurs. This regime is sub-divided into pseudometallic and pseudosemiconducting parts by a percolation threshold. On the basis of an effective-medium theory, we propose that the pseudometallic regime falls in the density range 8.2-9.3 g/${\mathrm{cm}}^3$ in liquid Hg and in the temperature range 1200°K to below 670°K in liquid Te.

We report tunable far-infrared radiation from $n$-type InSb under crossed magnetic and electric fields. The emission is interpreted in terms of the transitions of hot electrons between Landau sub-bands and the radiative capture by the impurity ground state.

A linearly field-dependent and temperature-independent exchange energy and spin-scattering anisotropy has been measured in a Cu-93-ppm Fe alloy using wave-shape analysis of the de Haas-van Alphen effect for the $〈111〉$ neck orbit over a field range of 30-45 kG and a temperature range of 1-2°K.

The normalization constant $C$ of the $N-d$ tail of the trinucleon wave function is derived from various sources. The measure of consistency between the extracted values, with $C^2\left({}_{}{}^3{}_{}{}^{}\mathrm{He}\right)=3.0\mathrm{}$ and $C^2\left({}_{}{}^3{}_{}{}^{}\mathrm{H}\right)=3.4\mathrm{}$, is strong support for according $C$ the same status as other trinucleon parameters such as the binding energy, charge radius, and form factor.

Three $\gamma$-ray cascades have been excited in ${}_{}{}^{101}{}_{}{}^{}\mathrm{Pd}$ by (heavy-ion, $\mathrm{xn}$) reactions. Excitation functions, $\gamma$-ray angular distributions, and $\gamma -\gamma$ coincidence measurements were used to show that the $\gamma$ rays came from three bands built on ${\frac{5}{2}}^{+}$, ${\frac{7}{2}}^{+}$, and ${\frac{11}{2}}^{-}$ intrinsic states.

The lowest analog resonances in ${}_{}{}^{89}{}_{}{}^{}\mathrm{Y}$, ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$, ${}_{}{}^{91}{}_{}{}^{}\mathrm{Nb}$, and ${}_{}{}^{93}{}_{}{}^{}\mathrm{Nb}$ have been investigated with polarized protons. The consistent fit of the direct and compound-nucleus contributions to both resonance and background scattering for the elastic proton and the neutron decay channels yields an internal spreading width ${\Gamma }_{\mathrm{int}}\downarrow =12\mathrm{}\pm 3$ keV.

The recently proposed Lagrangian of a free string is quantized by means of path integrals. It is shown how Veneziano amplitudes are obtained in this picture by coupling the string with external sources.

A dual multiperipheral model is proposed in which duality plays an important role alongside multi-Reggeism and unitarity. Assuming that the Regge trajectories are generated through the resonating contributions, I find that the leading Reggeon has to bootstrap itself. Furthermore, a Pomeranchukon with intercept equal to unity is generated naturally through the background contributions, independent of the strength of the coupling constant. The bootstrapping potential and other interesting results of the model are discussed.

A sum rule for isovector Compton scattering, previously derived using dispersive techniques, is rederived using the + + light-cone commutator. The (nontrivial) limit of the sum rule at $q^2=0\mathrm{}$ is given, and is found to be in excellent agreement with experiment. The deep-inelastic limit of the sum rule is discussed in the context of the covariant parton model, where it is shown that the free-field realization is untenable.

Mössbauer linewidth measurements of the 77.34-keV $\gamma$ ray of ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$ are reported as a function of absorber thickness for Au metal foils and for AuCN and KAu${\mathrm{}\left(\mathrm{CN}\right)\mathrm{}}_2$ powders dispersed in inert boron nitride. The linewidths extrapolated to zero absorber thickness for these materials agree with each other, with previous Mössbauer results for Au, and with values deduced from electronic lifetime measurements to well within 3%. The recently reported anomalous ∼ 13% line narrowing in AuCN and KAu${\mathrm{}\left(\mathrm{CN}\right)\mathrm{}}_2$ is therefore not confirmed.

Brillouin-scattering results are reported for monodomain samples of $\beta$-methyl butyl $p$ [($p$-methoxy benzylidine)amino] cinnamate in both the smectic-$A$ and -$B$ phases. For both phases theoretical predictions are confirmed concerning the number and polarizations of the propagating hypersonic waves. We report quantitative measurements of various thermodynamic derivatives, including the coupling between density and smectic-layer spacing. We discuss preliminary evidence concerning one model of the smectic-$B$ phase.

We describe and calculate the growth rate of a magnetohydrodynamic neutral-sheet instability due to electron-inertia terms in the infinite-conductivity Ohm's law. The results are compared with an approximate Vlasov-equation calculation, and are shown to be particularly germane to the geomagnetic-tail instability.