A column of plasma whose electrons are rapidly heated by an electron beam or laser will expand against the external magnetic field, setting up large-amplitude magnetosonic oscillations. We study the dissipation of these oscillations by anomalous resistance, ion Landau damping, and ion counterstreaming, and show that much of the initial $T_e$ can be converted into $T_i$.

A numerical charge integration procedure has been applied to diffraction data of TTF-TCNQ (tetrathiafulvalene-tetracyanoquinodimethane) measured at 100°K. The results indicate an average charge transfer of (0.48-0.60) ± 0.15 electrons from a TTF to a TCNQ molecule.

Unbroken chiral symmetry (with a vanishing $\sigma$ term) relates the ${\psi }^{\prime }\to \psi \pi \pi$ decay amplitude to three basic parameters. Two of these parameters put strong angular correlations in the amplitude which, apparently, are not observed. Taking these two parameters to vanish, we obtain an isotropic decay which is strongly peaked in the region where the invariant mass of the $\pi \pi$ system is large.

We have detected and identified charged particles with an energy of more than 0.5 MeV that were emitted by a carbon target following the absorption of stopped negative pions. Particles of mass 1, 2, 3, 4, 6, and 7 were found. The energy spectrum of the $\alpha$ particles was measured from 0.5 to 30 MeV. The rate for the emission of $\alpha \text{'}\mathrm{s}$ integrated over all energies above 0.5 MeV was found to be 1.00 ± 0.07 $\alpha /\mathrm{pion}$.

Analyzing power and differential cross sections for the inelastic scattering of protons to the collective states of ${}_{}{}^{58,60}{}_{}{}^{}\mathrm{Ni}$ and ${}_{}{}^{64}{}_{}{}^{}\mathrm{Zn}$ have been measured with 15-MeV polarized protons. The success in fitting the experimental data with a microscopic reaction analysis strikingly points out the usefulness of nuclear-structure calculations with a spin-dependent surface-delta interaction.

A spectrum of deuterons consistent with the reaction ${}_{}{}^3{}_{}{}^{}\mathrm{He}+{}_{}{}^3{}_{}{}^{}\mathrm{He}\to {}_{}{}^2{}_{}{}^{}\mathrm{H}+{}_{}{}^4{}_{}{}^{}\mathrm{He}+e^{+}+\nu$ has been detected with a system sensitive to cross sections of 300 pb ${\mathrm{sr}}^{-1\mathrm{}}$ Me${\mathrm{V}}^{-1\mathrm{}}$. The measured cross section is too high for a weak-interaction process: 3.4 nb Me${\mathrm{V}}^{-1\mathrm{}}$ ${\mathrm{sr}}^{-1\mathrm{}}$. It might be due to an interaction of intermediate strength and it could explain the low flux of high-energy solar neutrinos.

The reaction ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}({}_{}{}^{14}{}_{}{}^{}\mathrm{N}, \mathrm{pn}\gamma ){}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ has been used to populate high-spin states in ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, and levels at 6930 and 8098 keV are identified as the $6^{+}$ and $8^{+}$ yrast states. The results suggest the termination at spin 8 of the band based on the 3.35-MeV state. The previously identified level at 6930 keV is found to be a doublet.

We have derived an equation for the $\beta$-ray angular distribution including Coulomb corrections, radiative corrections, induced effect, and higher-order nuclear matrices. With this equation and the experimental data on $\beta$-ray asymmetries in polarized ${}_{}{}^{12}{}_{}{}^{}\mathrm{B}$ and ${}_{}{}^{12}{}_{}{}^{}\mathrm{N}$, we conclude that the strength of the second-class induced tensor is $\frac{f_T}{f_A}=-(0.96\mathrm{}\pm 0.35)\times {10}^{-3\mathrm{}}$ in the limit of the impulse approximation. A possible modification of this value due to mesonic corrections is discussed.

An electrostatic confinement device has provided resonance linewidths ≃ 1 kHz for the hyperfine transition $F=1\mathrm{}$, $m_F=0\mathrm{}$ to $F=0\mathrm{}$, in metastable $2s$ ${}_{}{}^3{}_{}{}^{}\mathrm{He}_{}^{+}{}_{}{}^{}$. The state-selection and resonance-detection scheme is the same used in an earlier ion-beam experiment; however, ion storage has yielded a resonance linewidth narrower by a factor of 100. Our result for the $2s$ hyperfine structure is $\Delta {\nu }_2=1083.354\mathrm{}969\left(30\right)\mathrm{}$ MHz. Comparison with the $1s$ hyperfine structure yields a test of state-dependent terms in the theory.

Excitation of ion-acoustic waves by a current due to the dissipative effect of electron-neutral collisions is studied experimentally. The ion waves grow to a very large amplitude ($\frac{\delta n}{n}\sim 1$) where ion-trapping phenomena and sideband formation are expected to be important.

A 4-J, 10.6-μm, pulsed (2 nsec), C${\mathrm{O}}_2$ laser has produced small amounts (4 × ${10}^{-7\mathrm{}}$ of incident fundamental) of second-harmonic back emission (5.3 μm) with a definite threshold at about 1 J. Any three-halves frequency emission (7.07 μm) is at least 50 times fainter than the second harmonic. This is consistent with theoretical concepts.

An electromagnetic instability leading to filamentation of the current flowing along a magnetic field in a highly resistive plasma is investigated. The instability provides a possible explanation of the discrepancy that exists between turbulent-heating experiments and numerical simulations of the electrostatic parallel-field current-driven instability.

The experimental consequences of a scheme to identify the newly discovered resonances in $e^{+}{e}^{-}$ annihilation as the daughters of the $\phi \mathrm{}\left(1019\right)\mathrm{}$ meson are discussed. The two narrowwidth resonances with masses at 3105 and 3695 MeV are proposed to be described by closely located zero-pole systems instead of simple poles.

We have measured the scattered intensity from the high- (+) and low- (-) density phases of a critical binary mixture and found that $(I_{+}-I_{-})\sim t^{-\theta }$ where $\theta =1-\beta$. Here $\beta$ is the critical exponent for the coexistence curve and the reduced temperature $t=\frac{(T_c-T)}{T_c}$ with $T_c$ the critical temperature. This result is in good agreement with the prediction of the revised scaling equation of state proposed by Rehr and Mermin.

The librational modes of the $〈100〉$-split interstitial in fcc metals can undergo resonant hybridization with the phonons of the perfect crystal. As in the analogous case of KCl: C${\mathrm{N}}^{-}$, this hybridization leads to effects which can be observed by inelastic neutron scattering at concentrations orders of magnitude smaller than those required for the observation of effects introduced by simple substitutional impurities.

The nematic-smectic-$A$ transition temperature of mixtures of HBAB {$p$-[($p$-hexyloxybenzylidene)-amino]benzonitrile} and CBOOA [N-$p$-cyanobenzylidene-$p-n$-octyloxyaniline] becomes multivalued with increasing concentration of HBAB. The nematic phase occurs at both a higher and a lower temperature than the smectic phase. Measurements of the bend elastic constant as a function of concentration are presented.

The excited ${\Gamma }_7$ state of ${\mathrm{Ti}}^{3+}$ in CsAl alum has been determined by spin-lattice relaxation measurements in the temperature range of 2.63-1.27°K to be 7±1 ${\mathrm{cm}}^{-1\mathrm{}}$ above the quasi-${\Gamma }_8$ ground state. The agreement with theoretical predictions confirms the strong coupling of the ${\Gamma }_{5\mathrm{g}}$ electronic state to the ${\Gamma }_{3\mathrm{g}}$ vibrational mode.

It is shown that Mahan-Nozières-De Dominicis singularity provides a highly accurate description of the shape of x-ray-photoemission lines in metals. This strongly suggests that this mechanism must have general validity in core-level spectroscopies.

New results and new microscopic models are presented to describe chemical trends in barrier heights at transition-metal-silicide-silicon interfaces and at nontransition-metal-silicon interfaces, where in the latter case a very thin oxide is present.

The pinning-force density $P_v$ in Nb single crystals containing platelike ${\mathrm{Nb}}_2$N precipitates shows a strong dependence on the orientation of the precipitates with respect to the fluxline direction. Using purely geometrical arguments this anisotropy can be quantitatively explained by assuming that $P_v\propto {K_0}^2$, where $K_0$ is the individual flux-line-defect interaction force. This points to a summation process which is governed by the elastic behavior of the flux lattice.