Refractive-index coexistence curves for films of the binary fluid mixture 2, 6-lutidine + water are analyzed. The critical-temperature-shift exponent and the crossover-temperature exponent agree well with scaling-theory predictions. The two-dimensional coexistence-curve amplitudes are largely consistent with the scaling prediction. The predicted behavior is superimposed on systematically displaced coexistence curves. We argue that the displacement arises from interaction between the fluid and the plane mirrors which confine it.

We show that a BCS-type ground state with the Anderson-Brinkman-Morel order parameter has a total angular momentum of $\frac{1}{2}N\hslash$ provided that three conditions (axial symmetry, single valuedness, and regularity) are satisfied. Some generalizations of this result as well as a short comparison with other work are also presented.

Events of the type $e^{+}{e}^{-}\to e^{+}{e}^{-}{\eta }^{\prime }\mathrm{}\left(958\right)\mathrm{}$ have been observed with the Mark II detector at SPEAR by detecting the decay mode ${\eta }^{\prime }\to {\rho }^0\gamma$. From the observed cross section and known branching fractions of the ${\eta }^{\prime }$ is ${\Gamma }_{\gamma \gamma }=5.9\mathrm{}\pm 1.6\pm 1.2$ keV and the total width is $\Gamma =300\mathrm{}\pm 90\pm 60$ keV (statistical and systematic errors).

The $D^{\circ }$ Cabibbo-suppressed decay modes ${\pi }^{-}{\pi }^{+}$ and $K^{-}{K}^{+}$ have been observed and the following ratios of $D^{\circ }$ partial decay widths have been measured: $\frac{\Gamma (D^{\circ }\to {\pi }^{-}{\pi }^{+})}{\Gamma (D^{\circ }\to K^{-}{\pi }^{+})}=0.033\mathrm{}\pm 0.015$ and $\frac{\Gamma (D^{\circ }\to K^{-}{K}^{+})}{\Gamma (D^{\circ }\to K^{-}{\pi }^{+})}=0.113\mathrm{}\pm 0.030$.

With use of strong-coupling methods, the energy of a long flux string is computed and this quantity is used to renormalize the theory. This gives an expansion for the renormalization-group beta function which smoothly extrapolates from the strong-coupling limit to the asymptotic-freedom value. The theory is described by three qualitatively distinct regions over this range.

Angular distributions from the ($p$,${\pi }^{+}$) and ($p$,${\pi }^{-}$) reactions on ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ leading to discrete isobaric analog states in ${}_{}{}^{10}{}_{}{}^{}\mathrm{Be}$ and ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}$ have been measured at 800 MeV over the momentum-transfer interval 600-800 MeV/c. The ratio between the ($p$,${\pi }^{+}$) and ($p$,${\pi }^{-}$) production cross sections is found to be much larger at 800 MeV than at lower energy. The angular distributions from the ($p$,${\pi }^{-}$) reaction show a pronounced slope not observed in previous data.

Use of a total $\gamma$-energy spectrometer in coincidence with a variety of detectors has led to the observation of the highest multiplicities yet achieved for compound nuclear products, allowing for the selection and study of high angular momentum states. A differential comparison of coincident $\gamma$ spectra corresponding to slices of the total-energy spectrum yields a direct evaluation of the moment of inertia for a rotational nuclear structure.

Recent distorted-wave impulse-approximation analyses of ($p$,$2p$) reactions induced by polarized and unpolarized protons have assumed that the spin-orbit parts of the distorting potentials can be omitted. Calculations which include spin-orbit terms for all three particles are compared with experimental data. In most cases the effects are small although there are noticeable changes in the case of ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$($p_{\mathrm{pol}}$,$2p$)${}_{}{}^{39}{}_{}{}^{}\mathrm{K}$ at 200 MeV.

This paper reports studies of the dependence of the $\alpha$-emission probability for transitional, rare-earth, and actinide nuclei on changes of deformation at very high angular momenta. It has been found that often nuclei are trapped into configurations with anomalously large stability against $\alpha$ emission at spins below the fission instability. The effect, if observed in experiment, could yield a direct test of the theoretically predicted large shape changes in the rotating nucleus.

A series of careful diffraction experiments on krypton gas have been done over a range of densities along the room-temperature isotherm. These data are compared with Monte Carlo calculations based on the (known) pair potential for krypton. Small differences are observed which are interpreted in terms of the three-body potential. It is probable that some experimental information concerning the short-range part of this potential can be derived from these data.

The electron capture by protons in a gas target is calculated in the Oppenheimer-Brinkman-Kramers approximation. The complete density matrix for the $n=2\mathrm{}$ hydrogen level is established. Electric-field-induced $s-p$ coherence quantum beats are investigated. Good agreement with the experimental data is achieved.

An experiment analogous to a three-level absorption line-narrowing experiment is performed between atoms of two different species (krypton and xenon) connected by a resonant excitation transfer. Results show that the hole burned in the velocity distribution of krypton atoms is transferred to xenon ones. This effect is interpreted by introducing a cross-collision kernel. Analysis of the experimental line shapes is consistent with a Gaussian shape of this kernel, whose width is found to be pressure independent.

The time-dependent Schrödinger equation for the motion of the electron in a ${\mathrm{H}}^{+}$-H collision is solved numerically with a finite-difference method on an axially symmetric spatial mesh. Sample density distributions for $E_{\mathrm{lab}}=20\mathrm{}$ keV are shown. The calculated charge-transfer probabilities at $E_{\mathrm{lab}}=3.92, 7.69, \mathrm{and} 20.1$ keV are in good agreement with experiment.

A molecular ion (H${\mathrm{Br}}^{+}$) has been observed for the first time by laser magnetic resonance spectroscopy. Pure rotational transitions have been detected with five different far-infrared laser lines. Assignment of the hyperfine patterns has produced values for the magnetic hyperfine constants.

We have discovered a novel, spatially propagating wave front which is generated by laser pumping of an optically thick medium to a state of complete transparency. The wave front consists of a moving band of fluorescent light which marks the location of atoms which are being pumped. The wave-front velocity $v$, the photon flux $I_0$, the atomic number density $N$, and the number $n$ of photons absorbed per atom are related by $v=I_0\times {\mathrm{}\left(\mathrm{Nn}\right)\mathrm{}}^{-1\mathrm{}}$.

Laser-irradiated thin-foil experiments at 1.06 and 0.53 μm show that heat penetration in the target is greater at shorter wavelengths as a consequence of larger ablation rate. Comparison of experimental and numerical results indicates that comparable flux inhibition occurs at both wavelengths.

The intensity modulations in a constant initial-state spectrum are found to possess selective sensitivity to layer spacings just below the emitting atom. This can be used to successively determine unknown spacings in a complex surface structure. A simple computation method is found to work accurately at electron energies above 60 eV.

The velocity autocorrelation in a two-dimensional Lennard-Jones system is obtained by the molecular-dynamics method. At moderate densities the autocorrelation function decays slowly, proportional to the inverse time whereas it decays rapidly at high density. The model is compared with monolayers of methane adsorbed on the basal plane of graphite. The influence of the substrate on the diffusion is small and the calculated and experimentally obtained diffusion constants agree at high density.

The first direct measurements of charge emission from silicon grain-boundary defect states have been made by monitoring the recovery of the nonequilibrium grain-boundary barrier capacitance. The density of grain-boundary states obtained in this fashion is in excellent agreement with the values found from deconvoluting room-temperature $I-V$ data. These data are shown to suggest strongly that the double-depletion-layer/thermal-emission model gives a good description of silicon grain boundaries.