The reaction ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$)${}_{}{}^{50}{}_{}{}^{}\mathrm{Ti}$ to the lowest ${\mathrm{O}}^{+}$, $2^{+}$, $4^{+}$, and $6^{+}$ states of ${}_{}{}^{50}{}_{}{}^{}\mathrm{Ti}$ has been studied at 56 MeV. Rapid oscillations in the angular distribution persist to extreme forward angles (${\theta }_L=3\mathrm{}°$). In the present data, the forward-angle structure is found to be an unambiguous indicator of the transferred angular momentum. The data are reproduced by distorted-wave Born-approximation calculations. A qualitative understanding is obtained in the strong-absorption model. It is believed that such behavior will occur in many heavy-ion-induced transfer reactions.

A spinning neutron star surrounded by a magnetosphere is widely accepted as the basic pulsar model. We have obtained a self-consistent numerical solution for the case when the rotation and magnetic axes are aligned. The field lines close even beyond the light radius $R_L$, and with Crab-pulsar parameters 5 × ${10}^{37}$ erg/sec are carried away by relativistic particles. An equatorial region of high-energy density is found near $R_L$ which could be the region of observed radio emission.

Near a charged black hole (or any other space-time permeated by a steady electromagnetic field) an electromagnetic mode oscillates in sympathy with a suitably polarized gravitational mode (and conversely). Two co-traveling modes beat against each other, exchanging totally and periodically their common energy along their history near the black hole. The black hole serves therefore as a catalyst for converting electromagnetic into gravitational radiation. Thus the effective coupling of charged matter with gravitational radiation is of the same order of magnitude as with electromagnetic radiation.

We present a representation of the Poincaré group corresponding to a directly interacting system of particles valid to order $\frac{1}{c^2}$ which satisfies the condition of separability of the interaction.

Expressions are given for atomic photoelectron angular distributions in $\mathrm{LS}$ coupling in which the role of anisotropic final state electron-ion interactions emerges explicitly. Calculations of photoelectron angular distributions for atomic sulfur are presented in which these anisotropic interactions produce clear deviations from the predictions of the Cooper-Zare model. Such effects are expected to be a general feature of photoelectron angular distributions for most open-shell atoms.

We describe measurements of the scattering of ${\mathrm{CO}}_2$ laser radiation by long-wavelength ($k{\lambda }_D\sim 0.1$) turbulent density fluctuations within a collisionless shock. The spectrum of the scattered radiation is shifted in wavelength from that of the incident laser beam, demonstrating genuine scattering rather than enhanced stray light. The observed level of fluctuations is a hundred times thermal but a thousand times lower than that to be expected from an extrapolation of the Kadomtsev spectrum observed previously for $k{\lambda }_D\sim 1$.

Measurements have been made of the angular spreading of initially well-defined beams of phonons of energies $\frac{\hslash \omega }{k_B}\lesssim 12$ K in liquid ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ at $T\sim 0.1$ K and at pressures between saturated vapor pressure and 24 bars. The spreading is consistent with three-phonon decay processes and the results strongly suggest that in the dispersion relation $\omega =cq(1-\gamma {\hslash }^2{q}^2)$ the constant $\gamma$ is negative at $p\lesssim 17$ bars and positive at higher pressures.

The viscosity and the density of the normal component of liquid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ in the $A$ and $B$ phases have been determined at the melting curve with a vibrating-wire viscometer. The results show that resistive flow of the liquid is accompanied by a flow of zero viscosity. The data thus prove superfluidity both in the $A$ and in the $B$ phase.

We examine the dynamic and thermodynamic properties of adsorbed liquid films in cylindrical cavities. We find a dynamical stability limit for the thickness of films adsorbed uniformly on the walls. This limit is shown to coincide with a thermodynamic stability limit which depends on both substrate and capillary forces. The Kelvin equation describing capillary condensation is generalized to include the substrate interaction. The low-temperature properties of the films are calculated.

The optical absorption and emission spectra of electron-bombarded liquid helium has been studied as a function of pressure between the saturated vapor pressure and 25 atm. The transitions of ${\mathrm{He}}^{*}$ and ${\mathrm{He}}_2^{*}$ in the liquid shift toward the blue with increasing pressure. The observed line profile and pressure shift of the $\mathrm{He}\left(2\mathrm{}{}_{}{}^3{}_{}{}^{}P\right)\leftarrow \mathrm{He}\left(2\mathrm{}{}_{}{}^3{}_{}{}^{}S\right)$ atomic absorption line are in good agreement with recent static line broadening calculations. We also report a strong pressure-dependent quenching of the excited atomic and molecular states in the liquid.

We calculate the effects of long-wavelength fluctuations on the electrical conductivity and lattice stability of a quasi-one-dimensional metal. Attractive interactions stabilize the lattice and cause a conductivity divergence at zero temperature. These results are exact and can be related to problems in two-dimensional relativistic quantum field theory.

It is shown that quasielastic knockout ($e,2e$) of electron by a fast electron from a thin solid film presents direct information about both the $\overrightarrow{\mathrm{k}}$ and $\omega$ dependence of the single-particle, spectral-weight function $A(\overrightarrow{\mathrm{k}},\omega )$ of target electrons. We discuss the expected manifestation of Mahan-Nozières edges and their plasmon satellites in an ($e,2e$) experiment side by side with that of plasmaron hole states.

Differences in photoelectric transition probabilities have an important effect on the interpretation of x-ray photoemission spectra of transition-metal compounds with pronounced overlap-covalency effects. It is shown that the apparent discrepancy between the x-ray-photoemission valence-band data for ${\mathrm{ReO}}_3$ and the theoretical density-of-states curve is resolved if one considers only the $5d$ component of the density of states.

Collisional excitation of negative iodine ions produces a group of peaks between 5 and 8 eV in the detached-electron spectrum. The autodetaching states decaying into these peaks appear to have dominant configurations of the form $\left(I^{+} \mathrm{core}\right)6s6l$. No structure is apparent at lower electron energies.

The electronic transition moment between the $B{}_{}{}^1{}_{}{}^{}\Pi _{\mathrm{u}}^{}{}_{}{}^{}$ and $X{}_{}{}^1{}_{}{}^{}\Sigma _{\mathrm{g}}^{}{}_{}{}^{}$ states of the ${\mathrm{Na}}_2$ dimer is measured as a function of internuclear separation by monitoring the laser-induced atomic fluorescence signal.

Light scattering has been used to study phase separation near the critical point in a binary mixture of methanol and cyclohexane. The intensity measurements are in conformity with the spinodal decomposition theory of Cahn. Measurements were also made of the spectral width of the scattered light in the phase separation process.

The viscous torque induced in a plane shear flow on the director $\overrightarrow{\mathrm{n}}$ of $p-n-\mathrm{Hexyloxybenzilidene}-p^{\prime }-\mathrm{aminobenzonitrile}$ (nematic below $T_c\sim 102$°C) when $\overrightarrow{\mathrm{n}}$ is parallel to the velocity changes sign at a temperature $T_c-8\mathrm{}$°C, in agreement with Gähwiller's experiments on a Poiseuille flow. We compare the instability modes obtained near $T_c$ with the similar problem for $p^{\prime }-\mathrm{methoxybenzylidene}-p-n-\mathrm{butylaniline}$ and give the first discussion of the instability modes in the low-temperature domain.

Measurements of $\frac{\mathrm{Tdp}}{\mathrm{dT}}$ have been made along the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ melting curve near an anomaly at $T_s=1.17\mathrm{}$ mK. It is found that the solid-${}_{}{}^3{}_{}{}^{}\mathrm{He}$ entropy decreases by 80% in an interval of 100 μK at $T_s$. This is attributed to onset of nuclear magnetic order.

This Letter reports the results of an investigation of the magnetothermal resistivity of potassium aimed at measuring the contribution of the lattice to the thermal current. The observed behavior of the lattice conductivity is contrary to that expected, possibly suggesting other contributions to the thermal current.

Ab initio wave functions and properties have been calculated for 14-, 26-, 38-, 50-, and 62-membered rings of hydrogen atoms. The properties converge rather quickly (with respect to the number of atoms in the ring) to those expected for one-dimensional metallic hydrogen. Electron correlation is explicitly considered by way of extensive configuration interaction. The cohesive energy is predicted to be 1.73 ± 0.2 eV per hydrogen atom.