An anomalously large result is predicted in the first Born approximation for the scattering cross section of a turbulent, weakly ionized plasma for the case when $\omega >{\omega }_p$, ${\nu }_{en}>{\omega }_p$, and $\omega \sim {\nu }_{en}$.

A very quiescent helium plasma, with density fluctuations of less than $0.2\%$, is produced by applying the stabilizing field of permanent magnets. The steady-state plasma column created in this field, which is of the average minimum-$B$ type, not only proves to be extremely quiescent but also has a homogeneous density distribution in the axial direction ($\frac{\Delta n}{n\Delta z}\approx 2\times {10}^{-3}$ ${\mathrm{cm}}^{-1\mathrm{}}$). The plasma has a density of 5×${10}^{10}$ ${\mathrm{cm}}^{-3\mathrm{}}$; the electron temperature is about 7 eV.

A very high-frequency (2.458×${10}^8$ G) quantum oscillation corresponding to the quantization of flux through the cross section of the Brillouin zone—Pippard's "zone oscillation"—is found when $\overrightarrow{\mathrm{H}}$ is within $1^{\mathrm{o}}$ of the $c$ axis. It is best seen at ${4.2}^{\mathrm{o}}$K, where it constitutes 5% of the resistance, while its anomalously small effective mass causes it to be swamped by slower oscillations at $1^{\mathrm{o}}$K. A second harmonic is seen for $\overrightarrow{\mathrm{H}}$ within ${0.04}^{\mathrm{o}}$ of the $c$ axis.

The model Hamiltonian used by Nozieres and De Dominicis in calculating the threshold behavior of x-ray emission and absorption in metals is applied to the situation where a core excitation is created by a fast electron. Explicit expressions are given for the exponent governing the threshold behavior. For transitions involving $s$-state core levels it is possible for stronger threshold divergences to occur than for the x-ray problem.

The electron states of amorphous and single-crystal trigonal selenium were investigated by high-resolution photoemission spectroscopy. Structures due to a high density of states 0.2 eV below and 6.9 eV above the valence-band edge for crystalline Se are absent in the amorphous phase, but structures due to deeper valence-band density-of-states features remain. The results provide the first direct evidence for disorder effects on the Se valence and conduction bands and agree with calculations for amorphous Se using a pseudopotential formalism.

The reflectivity of $n$-type InSb has been measured in the far infrared. The doping of the samples was such that the free-carrier plasma frequency was near the LO mode frequency. The results suggest that samples with a sufficiently thick damage layer show effects due to surface plasmons. Use of a simple model indicates that the surface-plasma excitations are coupled to the phonons.

Single crystals of ${\mathrm{K}}_2$Pt${\mathrm{}\left(\mathrm{CN}\right)\mathrm{}}_4$${\mathrm{Br}}_{0.3}$·${\left({\mathrm{H}}_2\mathrm{O}\right)}_n$ show a Drude-type optical reflectivity for light polarized parallel to the crystal axis. The energy of the plasma edge indicates a metallic density of free carriers. The relatively small conductivity at dc and low frequencies and the photoconductivity at ${4.2}^{\mathrm{o}}$K can be understood in terms of a simple model assuming metallic strands interrupted by lattice defects.

The first observation of acoustic paramagnetic resonance in a dense magnetic system (RbMn${\mathrm{F}}_3$) is reported and a theory proposed which correctly predicts the shape of the observed line.

Field-emitted electrons from magnetized monocrystalline Ni tips at 80 K have been investigated for spin polarization. A maximum polarization of 13% was observed. The predominant direction of the spins was parallel to the external magnetic field for electrons emitted around $〈100〉$, $〈110〉$, and $〈137〉$ and antiparallel for electrons emitted around $〈111〉$. Direction and degree of spin polarization is discussed in the context of band-structure theory and recent model calculations of field emission from $3d$ transition elements.

It is shown that for a system with strong correlations, the centroid of the spectroscopic amplitudes for particle removal is given by the single-particle energy (defined appropriately) times the occupation probability of the orbit.

The reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$)${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ was studied at 60 MeV and forward-angle reaction data to states of ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ were obtained. Different rotational bands were populated with different strengths consistent with cluster transfer processes. The previously questioned structure of the $K=0^{+}$ bands starting near 7 MeV is discussed and a new classification for the band is proposed.

The reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^{16}{}_{}{}^{}\mathrm{O},p){}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$ has been studied at $E_{\mathrm{lab}}\left({}_{}{}^{16}{}_{}{}^{}\mathrm{O}\right)=36\mathrm{} \mathrm{and} 60$ MeV with high resolution. Narrow levels of ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$ are seen in the region of $E_x=13\mathrm{} \mathrm{to} 20$ MeV in both measurements, and their locations suggest that the reaction is selectively sampling high-spin states in the region of the yrast line.

The scattering of protons from an aligned ${}_{}{}^{165}{}_{}{}^{}\mathrm{Ho}$ target [$\frac{B_2}{B_2}\left(max\right)=-0.34\mathrm{}$] is analyzed to obtain an estimate of the nuclear quadrupole moment or, equivalently, the nuclear deformation parameter $\beta$. The data are in resonable agreement with the result $\beta =0.33\mathrm{}$ derived from Coulomb excitation measurements.

The ($p,n$) reaction has been studied at $E_p=23\mathrm{}$ MeV on 35 nuclei ranging in mass from ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ to ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$. Overall energy resolution for the levels of interest ranged from 50 to 200 keV. Compound-nucleus contributions appear to be generally small at this bombarding energy. Early distorted-wave Born-approximation analysis of the data reveals several difficulties, both for macroscopic and microscopic forms of analysis.

A new technique is described for the detection of charged-particle tracks in glasses. The energy stored along the particle tracks is used to initiate heterogeneous nucleation of the second liquid phase. Track registration results are presented for uranium fission fragments using a sodium-silicate glass.

The ground-state mass of ${}_{}{}^{12}{}_{}{}^{}\mathrm{Be}$ was measured using the reaction ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$(${}_{}{}^7{}_{}{}^{}\mathrm{Li}$, 2p) ${}_{}{}^{12}{}_{}{}^{}\mathrm{Be}$ in a kinematically complete experiment. The mass excess was determined to be 24.95 ± 0.10 MeV. An excited state of ${}_{}{}^{12}{}_{}{}^{}\mathrm{Be}$ is identified at an excitation energy of 0.81 ± 0.10 MeV.

We establish that the nonanalytic behavior of some matrix elements in perturbation theory about a chiral symmetry implies that they can be calculated exactly to leading order in chiral breaking. For other matrix elements, analytic to leading order, we establish the hypothesis of threshold dominance in the chiral limit. As an application of this idea we calculate, to leading order in chiral breaking, the seven baryon-octet mass differences in terms of one parameter.

Deep-inelastic electron-proton scattering is shown to be naturally interpreted in a field theory where the current is given by a bilinear form in some fields. It is proved that in such a theory the Compton-scattering amplitude is not saturated with the vector-dominance model and that the term which scales in the Bjorken limit does not obey Freund-Harari duality.

We point out that the dual-resonance model suggests a new scaling law for the inclusive reaction $A+B\to X$ + anything at fixed production angle in the c.m. frame at high energies. The prediction is that $s^{-1}\ln {\left(\frac{d^2\sigma }{\mathrm{dqd}\Omega }\right)}_{\mathrm{c}.\mathrm{m}.\mathrm{}}$ approaches, up to a multiplicative constant, a universal function independent of $s$. The form of the function is simple and explicitly given. In the quasielastic limit this function approaches that predicted for wide-angle elastic scattering by the Veneziano model. Agreement with experiments is good.

The longitudinal momentum distribution of the final detected proton in $\mathrm{pp}$ inclusive reactions is flat for energies ranging from 20 to 1500 GeV. We show how this can be understood in the diffractive model, and how this information provides a way for calculating the average multiplicity and the pion longitudinal momentum distributions in $\mathrm{pp}$ inclusive reactions. No arbitrary parameter is used. The agreement with experiment is remarkably good.