Measurements of spin dynamics of $\mathrm{Cu}$-Mn alloys containing between 1 and 7 at.% Mn reveal the phenomenon of exchange narrowing in neutron scattering, the Korringa relaxation mechanism being responsible for the intrinsic broadening of the paramagnetic spectrum, which is well described by a simple Lorentzian in the dilute limit. Additionally, the spin-spin exchange leads to enhance broadening of the spectrum at higher $q\text{'}\mathrm{s}$ and generally to departures from the simple Lorentzian form of the spectral function.

Dielectric-constant measurements on KTa${\mathrm{O}}_3$: Li as a function of Li concentration, temperature, and frequency reveal the presence of a peak in the susceptibility near the paraelectric anomaly at 0 K. This effect is attributed to Li impurities which are "frozen" in an off-center position at the potassium site. For samples with a Li concentration of less than 24%, continuity of the elastic compliance ensures that a lattice polarization does not occur as for a true ferroelectric. Our results support the mean-field approach to the dynamics of impurities in ferroelectric hosts.

We have used, for the first time, superconducting tunneling to study the magnetic ordering properties of a normal metal. We find that the spin-flip scattering time of a spin-glass increases markedly as the temperature is lowered through the temperature at which the susceptibility exhibits a cusp. The results are interpreted as a measurement of the temperature dependence of the spin-glass order parameter.

The Schumacher-Slichter technique was utilized to determine the absolute Pauli spin susceptibility of stage-1 and stage-2 graphite-As${\mathrm{F}}_5$ intercalation compounds. The results lead to a determination of the densities of states at the Fermi energy, 2.8×${10}^{21}$ and 3.7×${10}^{21}$ states/eV ${\mathrm{cm}}^3$, respectively; substantially lower than in metals with comparable conductivity.

Measured nuclear quadrupole coupling constant values for $A15\mathrm{}$ phases correlate to derived values of a parameter that measures the eccentricity of an oblate spheroid of charge density about an atom on a chain site. One of the implications of this correlation, that the resistance to this shear distortion is an atomic property, is supported by another correlation between $C_{44}$ (cubic metals) and the electric quadrupole polarizability for the free neutral atom.

X-ray photoemission spectra of $4f$ and valence electrons in surface atoms of gold have been obtained. The surface-atom $4f$ level is shifted 0.40±0.01 eV to lower binding energy relative to the bulk value. The surface density of states is narrowed by (7.6 ± 1.1)% and its center of gravity is shifted to lower binding energy by 0.51±0.08 eV. A model is proposed to account for the core-level shift in terms of the modified surface density of states.

We measured $\frac{d\sigma }{\mathrm{dt}}$ for $p_{\uparrow }+p_{\uparrow }\to p+p$ from ${P_{\perp }}^2=4.50\mathrm{} \mathrm{to} 5.09$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ at 11.75 GeV/c. We used a 59%-polarized proton beam and a 71%-polarized proton target with both spins oriented perpendicular to the scattering plane. In these large-${P_{\perp }}^2$ hard-scattering events, spin effects are very large and the ratio ${\left(\frac{d\sigma }{\mathrm{dt}}\right)}_{\uparrow \uparrow }:{\left(\frac{d\sigma }{\mathrm{dt}}\right)}_{\uparrow \downarrow }$ grows rapidly with increasing ${P_{\perp }}^2$, reaching a value of 4 at 90° (c.m.). Thus, hard elastic scattering, which is presumably due to the direct scattering of the protons' constituents, may only occur when the two incident protons' spins are parallel.

We present data on ${\pi }^0$ and $\eta$ inclusive production from 100-GeV/c ${\pi }^{\pm }p$ collisions in the kinematic region $x>~0.7$ and $0<-t\lesssim 4$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. The results are in excellent agreement with the predictions of triple-Regge theory and we have extracted the $\rho$ and $A_2$ trajectories out to $-t=4\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$.

$\varphi \pi$ production in $e^{+}{e}^{-}$ annihilation and diffractive photoproduction are suggested as a signature for the production and decay of a vector $\mathrm{QQ}\overline{Q}\overline{Q}$ state. Rates are estimated and photoproduction in particular appears to give a reasonable signal.

The production of the $\omega$ meson by virtual photons has been measured as a function of $Q^2$ and $W$. The ratio of $\omega$ production to ${\rho }^0$ production is independent of $Q^2$ in contrast to indications at lower values of $W$.

The decay amplitudes for $D_{15}\to p\gamma$, the amplitude for $D_{05}\to \overline{K}N$, and the charge radius of the neutron are zero in the SU(6) limit, but are observed to be nonzero. We show that all of these SU(6)-violating effects can be understood quantitatively in terms of the admixtures of excited-state configurations in the nucleon expected on the basis of color hyperfine interactions. In particular, the admixture of ${}_{}{}^2{}_{}{}^{}S_M^{}{}_{}{}^{}$ (i.e., [70, $0^{+}$]) with an amplitude of about - ¼ is central to understanding all three effects.

Using electroproduction data, we have measured the charge ratio of residual hadron yields given a fixed-charge leading hadron. We find this ratio to favor unlike charges and to depend principally on $\frac{p_l}{p_{lmax}}$ of the residual hadrons. The two possible ratios are not charge symmetric. We also deduce that our result is not primarily a manifestation of charge conservation.

($e, e^{\prime }$) from the giant dipole resonance (GDR) in ${}_{}{}^{140}{}_{}{}^{}\mathrm{Ce}$ verifies the macroscopic model by Myers et al., while ruling out the Steinwedel-Jensen model and, to a lesser extent, the Goldhaber-Teller model. This result leads to discrepancies between ($\alpha , {\alpha }^{\prime }$) and ($e, e^{\prime }$) concerning the existence of a giant-monopole (breathing-mode) state, particularly if one considers the independent verification of the Meyers et al. model by the experimental $A^{-0.23\mathrm{}}$ energy dependence of the GDR.

Partial rates for radiative capture from the $1s$ atomic level in ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ to the lowest two ${}_{}{}^6{}_{}{}^{}\mathrm{He}$ states have been determined by measuring, with the necessary energy resolution, x rays and high-energy photons in coincidence. A comparison of our results and other related experimental results with different theoretical approaches shows that phenomenological wave functions consistently describe photopion processes as well as electromagnetic and weak transitions between low-lying ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^6{}_{}{}^{}\mathrm{He}$ states.

The neutron-induced fission cross section of ${}_{}{}^{230}{}_{}{}^{}\mathrm{Th}$ near 720 keV is resolved into sharp structures interpreted as two rotational bands with opposite parities, indicating an asymmetrically deformed third minimum in the fission barrier.

Because optical-model potentials are relatively well determined by light-ion elastic scattering, we have compared such potentials with the proximity potential, which was developed for heavy-ion reactions. After the real, nuclear potentials determined by $p$, $d$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$, and $\alpha$ scattering at 30-35 MeV/amu are transformed into the universal proximity form they are rather similar to each other and are in rough agreement with a theoretical proximity potential.

The enhancement factor $\kappa$ in the electric dipole sum rule is calculated for $A=2, 4, 16$ nuclei. Accurate solutions of the coupled Hartree- Fock, Bethe-Goldstone, and Bethe-Faddeev equations have been used for different realistic $\mathrm{NN}$ potentials. The need for measurements of the total cross sections, especially for ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, is emphasized.

A system of nonlinear equations describing the single-mode dynamics of both the Rayleigh-Bénard instability (RBI) and the Soret-driven instability (SDI) is derived. The system predicts saturation effects on the steady-state vertical temperature (concentration) gradient for the RBI (SDI), and transient relaxation oscillations above a given threshold. Good quantitative agreement is found with the experimental results. The possibility of observing giant pulses analogous to those observed in solid-state-laser transients is suggested.

Detailed studies of spectra from the ISX-$A$ (Impurity Study Experiment) tokamak at the Oak Ridge National Laboratory have shown that certain oxygen-ion lines appear too anomalously intense to have been excited solely by electron collisions. These results are interpreted as being due to charge transfer and suggest the necessity of incorporating this mechanism into analyses of tokamak plasmas.

A group of fast ablatively driven ions has been observed by Thomson-parabola and Faraday-cup analyses of an expanding plasma produced by focusing energetic 8-nsec Nd: glass-laser pulses onto thick planar targets. Numerical simulations reveal the formation of an ablation structure with characteristics that agree well with the experimental observations.