A detailed set of orbital Landau-level lifetimes of the third-band hole octahedron of molybdenum with 385 and 525 ppm tungsten impurities have been measured using the de Haas—van Alphen effect. Measurements were taken in the two principal symmetry planes. Although these data themselves were similar in shape and showed substantial anisotropies, an inversion, using a new and rather simple technique, produced point-scattering rates which markedly increased such anisotropies.

Measurements of the photoelectron energy distributions from gold indicate angular anisotropies of the emission even for evaporated films. In particular, relative intensities and positions of the $d$-band emission peaks depend on the electron emission angle. We also observe the dependence of the energy distribution on the incidence angle and polarization of the photons.

Susceptibility measurements are used to fit the two parameters of a phenomenological model based upon a nearly Lorentzian density of states. The model is then employed to calculate the single-impurity contribution to the specific heat of Cu:Fe as a function of temperature and magnetic field. The model is also briefly applied to Au:V.

A variation-after-projection Hartree-Fock calculation shows that the rms radius of ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ decreases with increasing spin in the ground-state band. This decrease is consistent with the significant reduction in $\alpha$ width between the $6^{+}$ and the $8^{+}$ states. It also leads to the theoretical $B\left(E2\mathrm{}\right)\mathrm{}$ values reproducing the measured values exceedingly well.

It is suggested on experimental grounds that the phonon components of particle-vibration coupled states in proton-odd nuclei can be studied with two-neutron transfer reactions. We discuss the case of low-lying excited states in odd copper isotopes. Some evidence is found for a change in the particle-vibration coupling in going from ${}_{}{}^{61}{}_{}{}^{}\mathrm{Cu}$ to ${}_{}{}^{63}{}_{}{}^{}\mathrm{Cu}$.

The energy, angular, and latitude distributions of energetic neutrons (up to 2 GeV) leaking from the top of the atmosphere have been calculated. The results agree with the recent measurement of Preszler, Simnett, and White, whose leakage rates were well above the calculation of Lingenfelter. Since the spectrum of Lingenfelter has served for evaluating the cosmic-ray albedo-neutron decay (CRAND) source of energetic protons in Earth's inner radiation belt, it is suggested that the results reported here be used to reevaluate the CRAND contribution.

We have calculated the contribution of fifty Feynman diagrams of the order ${\alpha }^3$ to the electron magnetic moment. Our result, $(1.02\mathrm{}\pm 0.04){\left(\frac{\alpha }{\pi }\right)}^3$, agrees with the result of Levine and Wright, and is about 5 times more accurate. Together with the contribution from the rest of the ${\alpha }^3$ diagrams calculated previously, the complete theoretical prediction for the electron anomaly up to the order ${\alpha }^3$ is $\frac{\alpha }{2\pi }-0.328\mathrm{}48{\left(\frac{\alpha }{\pi }\right)}^2+(1.29\mathrm{}\pm 0.06){\left(\frac{\alpha }{\pi }\right)}^3$, in good agreement with the latest experimental result.

An exact, closed-form, nonlinear solution is obtained for the Rayleigh-Taylor instability of a thin fluid layer. If the layer evolves from a small sinusoidal perturbation, its subsequent shape is in the form of a cycloid. The solution is good up to a time $t^{*}$ after which adjacent segments of the layer begin to collide with each other. A qualitative discussion of the layer dynamics for $t>\mathrm{}{t}^{*}$ is given.

The behavior of the plasma-current penetration in a toroidal device has been investigated for a wide range of plasma density (${10}^{11}\lesssim n\lesssim {10}^{13}$ ${\mathrm{cm}}^{-3\mathrm{}}$). The observed rapid penetration cannot be attributed to the enhancement of plasma resistivity. A possible explanation is proposed in terms of electrostatic instabilities driven by electron velocity gradients.

Enhanced confinement of thermally ionized potassium plasma with increasing number of magnetic mirrors has been observed in a steady-state single-ended $Q$ machine. The improved confinement occurs in an intermediate mean-free-path regime, and is in good agreement with theory.

Experimental results are presented which verify the fundamental aspects of the parametric instability of whistler waves. The accompanying fast heating of plasma is interpreted to be due to anomalous absorption.

New measurements demonstrate that neutrons produced in a high-current pulsed diode with deuterium-bearing electrodes are of beam-target origin. During a brief portion of a 70-nsec, 2-MV, 50-kA pulse, positive ions from the anode and cathode plasmas were observed to be accelerated toward the anode rather than the cathode as dictated by the externally applied field. Energetic deuterons were observed, behind a small aperture in the anode, which were the source of neutrons produced with Li or C anodes.

By focusing simultaneously microwave radiation and the beam from a tunable dye laser into a helium plasma, we observe two-photon absorption and stimulated Raman scattering on excited helium atoms. Both effects can be used to measure high-frequency electric fields in plasmas, and we discuss the advantages of this method as compared with the standard technique where such fields are investigated in emission spectra.

A phenomenological equation of state is presented which describes a thermodynamic system having a tricritical point. The equation is an asymptotic one—in the sense of ordinary critical-point theory—which obeys certain scaling relations and is consistent with Griffiths-Wheeler theory. It relates all tricritical exponents to the underlying second-order exponents by introducing a new exponent which determines the geometry of certain first-order phase lines at the tricritical point. The predictions are in reasonable agreement with experimental and numerical results.

The metallic zones induced by reactor fast neutrons in GaAs were studied. The samples were irradiated at 300 to 310 K and the electroreflectance spectrum of the samples was measured before irradiation and after several irradiation periods. After irradiation up to a fast-neutron fluence of about $7\times {10}^6\frac{n}{{\mathrm{cm}}^2}$ a new electroreflectance peak at 1.33 eV was observed. The appearance of this peak can be explained with a metal-like plasma resonance suggested by McNichols, Hayes, and Ginell.

The adiabatic elastic constants of single crystals of neon at 24.3 K and of argon at 82.0 K have been determined by Brillouin scattering. For argon the values are $C_{11}=2.33\mathrm{}\pm 0.08$, $C_{12}=1.49\mathrm{}\pm 0.06$, $C_{44}=1.17\mathrm{}\pm 0.07$, in units ${10}^{10}$ dyne/${\mathrm{cm}}^2$ with the elastic anisotropy $A=2.80\mathrm{}\pm 0.60$; for neon, the values are $C_{11}=1.175\mathrm{}\pm 0.020$, $C_{12}=0.740\mathrm{}\pm 0.020$, $C_{44}=0.595\mathrm{}\pm 0.015$, and $A=2.74\mathrm{}\pm 0.25$.

We report observation of bound-polaron hopping in pure NiO single crystals. The observed activation energy is $\approx 0.7$ eV, the bandwidth $J\approx {10}^{-2\mathrm{}}$ eV, and the binding center is suggested to be the ${\mathrm{Ni}}^{+2\mathrm{}}$ vacancy.

The plasmon dispersion curve for bcc potassium has been calculated for propagation along the (110) direction by specifically incorporating the electronic energy band structure. Calculated results are in excellent agreement with experiment.

A theory of the charge-density oscillation around resonant scatterers is presented which explains the recent experimental results on the anomalous charge perturbation around transition-metal impurities in Al and Cu. Its application to the Kondo effect suggests a crucial test for the existence of the Kondo resonance, and shows that available NMR data rule out the validity of the Kondo model for $\mathrm{A}\mathrm{l}-3d$-transition-metal alloys, while further experiments are proposed to answer this question in the case of Cu-based alloys.

The magnetic structures of metallic samarium have been determined from neutron-diffraction data on a single crystal of ${}_{}{}^{154}{}_{}{}^{}\mathrm{Sm}$. Anomalies in a number of physical properties of this metal at 106 and 13.8°K are associated with ordering of the moments on the hexagonal and cubic sites, respectively. The unusual form factor expected for a $4f^5$ configuration has been observed. Striking evidence for important conduction-electron polarization effects has been found.