A redetermination of the magnetic moment of the proton in nuclear magnetons has been performed using an omegatron. Special care was taken to make the phase of the rf electric field uniform inside the omegatron, and an almost rectangular line shape consistent with simple theory was obtained. Measurements were made both before and after gold plating the omegatron to check on the effects of nonuniform surface potentials. The value obtained uncorrected for diamagnetism was 2.792 783±0.000 016 (±6 ppm).

Cross sections for $L$ x-ray production in Cu have been measured for collisions between Cu and a wide range of heavy ions and atoms, for collision energies in the range 40 keV to 1.1 MeV. The cross sections show a very strong cyclic dependence on the $Z$ of the collision partner. These data indicate a lack of reciprocity in the roles of target and projectile.

Stimulated Rayleigh scattering caused by concentration fluctuations in a nonabsorbing binary gaseous mixture has been observed. The experimental results are in good agreement with theoretical expectations.

Critical rotational velocities about the magnetic axis in a toroidally confined plasma are derived from a kinematical condition for the formation of spatial discontinuities (steady shock waves) in ideal magnetohydrodynamics.

A two-fluid model of a toroidal axisymmetric plasma is employed to examine the resistive diffusion in a Tokamak configuration. The self-consistent magnetic field resulting from all plasma currents is included, and the time-dependent rotation computed. Several new terms, additional to the Pfirsch-Schluter diffusion, arise. Of these, one depends on the shear in the magnetic lines of force, and another on the outward displacement of the plasma constant-density surfaces relative to the magnetic surfaces.

The superconducting transition temperature of the compounds ${\mathrm{V}}_3$Si, ${\mathrm{V}}_3$Ga, and ${\mathrm{V}}_3$Ge is found to increase linearly with the application of hydrostatic pressure. This behavior is compared with predictions based upon measurements of the elastic moduli.

The wavelength modulation spectrum of Cu is presented at 7°K in the range of $2.0<~\hslash \omega <~6.0$ eV. The band structure of Cu calculated by the empirical pseudopotential method is used to compute the imaginary part of the dielectric function ${\epsilon }_2\left(\omega \right)$ and the logarithmic derivative of the reflectivity, $\frac{R^{\prime }\left(\omega \right)}{R\left(\omega \right)}$. Good agreement between theory and experiment is obtained at the absorption edge and at higher energies using the one-electron approximation if dipole matrix elements are calculated from wave functions including core contributions rather than the pseudowave functions. The transitions causing the structure in $\frac{R^{\prime }\left(\omega \right)}{R\left(\omega \right)}$ are identified.

Fifteen excited "even-parity" levels of donor impurities in Si are identified. Observed photoexcitation to these levels in violation of electric-dipole selection rules is attributed to effects of polarization of the donor by other defects and to breakdown of the effective-mass approximation.

The energy distribution of field-emitted electrons from single-crystal faces of tungsten exhibits structure which is extremely sensitive to surface contaminants. The structure for the (100) plane has the correct shape and energy expected for surface states resulting from spin-orbit—split bands. These results are in good agreement with recent theoretical predictions.

Anomalous exciton spectra have been observed in uniaxially deformed CuCl. The observed features, which cannot be accounted for by the previous theory, were successfully interpreted by the effect of the stress-induced $k$-linear terms in the energy band of CuCl, as very recently proposed by Sakoda and Onodera. Experimental evidences for this interpretation are presented.

The tantalum isotopes ${\mathrm{Ta}}^{170}$ and ${\mathrm{Ta}}^{171}$ were produced via the following reactions: ${\mathrm{Ho}}^{165}({\mathrm{C}}^{12},6n){\mathrm{Ta}}^{171}$, ${\mathrm{Tb}}^{159}({\mathrm{O}}^{16},4n){\mathrm{Ta}}^{171}$, ${\mathrm{Ho}}^{165}({\mathrm{C}}^{12},7n){\mathrm{Ta}}^{170}$, and ${\mathrm{Tb}}^{159}({\mathrm{O}}^{16},5n){\mathrm{Ta}}^{170}$. The half-life of ${\mathrm{Ta}}^{171}$ was determined to be 25 ± 2 min and of ${\mathrm{Ta}}^{170}$, 7 ± 2 min. About 60 $\gamma$ rays were assigned to the ${\mathrm{Ta}}^{171}$ decay, while in ${\mathrm{Ta}}^{170}$ decay, only the excitations of the first- and second-excited states of ${\mathrm{Hf}}^{170}$ were observed.

Elastic ${\pi }^{-}-\mathrm{C}$ scattering is calculated with the Kisslinger optical model from 120 to 280 MeV. With parameters obtained from ${\pi }^{-}-N$ phase shifts, general qualitative agreement is obtained with the recent Binon et al. data. Modifying the parameters further improves the fit.

The ($d,n$) reactions on the nuclei ${}_{}{}^{92}{}_{}{}^{}\mathrm{Mo}$, ${}_{}{}^{94}{}_{}{}^{}\mathrm{Mo}$, ${}_{}{}^{96}{}_{}{}^{}\mathrm{Mo}$, and ${}_{}{}^{96}{}_{}{}^{}\mathrm{Zr}$ leading to the isobaric analog states in the residual nuclei have been studied. The observed ($d,n$)-reaction cross sections show strong deviations from the distorted-wave Born-approximation calculations based upon the known neutron spectroscopic factors of the corresponding parent analog states.

Two-neutron transfer reactions in strongly deformed nuclei are discussed in the framework of the coupled-channel Born approximation. In particular, the reaction ${}_{}{}^{176}{}_{}{}^{}\mathrm{Yb}\mathrm{}(p,t)\mathrm{}{}_{}{}^{174}{}_{}{}^{}\mathrm{Yb}$ is analyzed.

We analyze the proposed Stanford experiment (precession of the spin of a gyroscope in an Earth satellite) to test the Lense-Thirring effect. We show that the sun also makes a contribution to the precession which must be included, particularly if one wishes to distinguish between the Einstein and Brans-Dicke theories.

The formation-zone effect in transition radiation due to charged particles with large Lorentz factor $\gamma$, both in air and in aluminum, has been investigated. A stack of aluminum foils spaced uniformly apart was used as the transition radiator. Positrons of 1-to 4-GeV energy ($\gamma =2000\mathrm{} \mathrm{to} 8000$) corresponding to protons of energy 2000-8000 GeV) were employed. The formation-zone effect sets in at about 5 mils in air and at around 0.5 mil in aluminum.

We prove that the leading $J$-plane singularity in the symmetric partial-wave amplitude $F_J^{}{}_{}{}^{+}\mathrm{}\left(t\right)\mathrm{}$ near $t=0\mathrm{}$ should behave like ${\alpha }_{\pm }\mathrm{}\left(t\right)=1\mathrm{}\pm A{t}^{\frac{1}{2}}+$ terms of higher order in $t$; namely, the Pomeranchuk pole (or cut) must be a pair of complex-conjugate poles (cuts) if the total cross sections $\sigma _T^{}{}_{}{}^{p,a}\mathrm{}\left(s\right)\mathrm{}\underset{s\to \infty }{\to }\mathrm{const}$ and $\sigma _T^{}{}_{}{}^P\left(\infty \right)\ne \sigma _T^{}{}_{}{}^a\left(\infty \right)$, where $p$ and $a$ denote particle-particle and antiparticle-particle scattering, respectively. We use only unitarity and analyticity to prove this.

The combined high-energy data for $\gamma p\to {\pi }^{+}n$, $\gamma n\to {\pi }^{-}p$, $\mathrm{np}\to \mathrm{pn}$, $\overline{p}p\to \overline{n}n$, $\gamma p\to {\pi }^{0}p$, and $\gamma p\to \eta p$ are successfully described in a strong absorptive (Regge-cut) model. Only the high-lying trajectories, $\omega$, $\rho$, $A_2$, and (evasive) $\pi$ and the associated cuts are necessary to understand the data. The ${\pi }^{\pm }$ photoproduction cross-section difference rules out "non-sense wrong-signature zeros." The scale of the cross sections is determined correctly by the conventional coupling strengths. The general features of pion exchange are discussed.

Muon pairs in the mass range $1<\mathrm{}{m}_{\mu \mu }<6.7\mathrm{} \frac{\mathrm{Gev}}{c^2}$ have been observed in collisions of high-energy protons with uranium nuclei. At an incident energy of 29 GeV, the cross section varies smoothly as $\frac{d\sigma }{d{m}_{\mu \mu }}\approx \frac{{10}^{-32\mathrm{}}}{m_{\mu \mu }^{}{}_{}{}^5} {\mathrm{cm}}^2 {\left(\frac{\mathrm{GeV}}{c}\right)}^{-2\mathrm{}}$ and exhibits no resonant structure. The total cross section increases by a factor of 5 as the proton energy rises from 22 to 29.5 GeV.

The product of the coupling constants for $\epsilon \to \pi \pi$ and $\epsilon \to 2\gamma$ is estimated from a super-convergent sum rule obtained from the helicity-flip amplitude of pion-Compton scattering. It is then used to show that the contribution of $\epsilon$ (even $C$) to the process $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma$ (to order ${\alpha }^3$) is about two orders of magnitude larger than that when the pions are in odd-$C$ states.