The resonant ($p^{+}$, H) electron-transfer cross section is calculated in the first-order Faddeev-Watson multiple-scattering approximation. The result shows that the cross section lies between the Brinkman-Kramers and Jackson-Schiff cross sections and approaches the Jackson-Schiff cross section in the high-energy limit. If the contribution coming from the on-shell Coulomb cuts is neglected, the cross section approaches the Brinkman-Kramers cross section asymptotically in the high-energy limit. Arguments are presented that the on-shell-cut contribution should be included in the calculation of the electron-transfer amplitude.

The radiative lifetime of Li II $2{}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$ has been measured by counting decay photons versus time from an ensemble of metastable Li ions stored in a simple electromagnetic trap of the Penning variety. The result is ${\tau }_{\mathrm{expt}}=503\mathrm{}\left(26\right)\mathrm{}$ μsec. The error represents one standard deviation from the mean of a series of 34 separate determinations. This result is in agreement with the theoretical value ${\tau }_{\mathrm{th}}=513\mathrm{}$ μsec.

Observations of the time development of damage tracks in sapphire are explained in terms of a backward-moving self-focused spot. The detailed characteristics of the dynamics of the track evolution depend on the temporal shape of the incident laser pulse. Both qualitative and semiquantitative features of the observed phenomena are explained using a theory which shows that the results are consistent with a combination of both electrostrictive and electronic self-focusing mechanisms.

A principle for a small nonplasma fusion device is proposed. Energetic ions are injected through the center of a Precetron-type magnetic field. An organized non-Maxwellian mixture ("migma") of particles having a central high-density region results. The collisions are predominantly head-on and Coulomb scattering effects significantly reduced. It is shown that the device can become critical, although, in the examples considered here, only at microwatt levels.

A dimensional and similarity argument analogous to that used in the description of the flux of turbulent energy in fluid flow is applied to the problem of energy dissipation by Joule heating in electrical conductors. A spectral density in the space domain is obtained, and is used to derive a spectral density in the time domain by means of a dispersion relation. The spectral density in the time domain is proportional to the inverse frequency.

The electrical conductivity in a toroidal plasma has been calculated, using the exact Fokker-Planck operators for electron-electron and electron-ion collisions. It is found that the nonlinear effects of the electron-electron operator are of order $\frac{r}{R}$, where $r$ and $R$ are the minor and major radii of a flux surface. The conductivity can be written as $\sigma ={\sigma }_{\mathrm{Spi}\mathrm{t}\mathrm{zer}}[1-\frac{3}{2}{\left(\frac{r}{R}\right)}^{\frac{1}{2}}+O(\frac{r}{R}\left)\right]$.

We observe a peak in the tunneling conductance between two very thin superconducting aluminum films in an intense parallel magnetic field at a voltage $V=\frac{({\Delta }_1+{\Delta }_2-2\mathrm{}\mu H)}{e}$. The magnetic field dependence of this peak identifies it as that predicted by Engler and Fulde for spin-state mixing in superconductors. The spin-orbit scattering rate $b=\frac{\hslash }{3\Delta }{\tau }_{\mathrm{s}.\mathrm{o}.\mathrm{}}$ obtained from this measurement is approximately 0.1.

We report what we believe are the first observations of metal-vacuum-metal tunneling. A field emitter is brought close to a metal surface and the current-voltage characteristic is measured in three regions: the Fowler-Nordheim region, the intermediate region, and-and the metal-vacuum-metal region.

Photoconductance response due to optical transitions induced by 44.3-meV laser radiation between surface subbands in the inversion layer on a (001) surface of $p$-type silicon is reported. The negative response indicates decreased mobility of electrons in the excited states. Magnetic fields normal to the surface accentuate the response for certain levels because of parallel-motion band mixing. These measurements are the first to demonstrate the large voltage tunability inherent in this electronic energy level system.

The progressive attenuation of resonance strength with decreasing specimen width is shown to furnish a direct means for studying orbit aspect ratios in the radio-frequency size effect. The mean free path of the orbiting electrons can also be determined. A simple model is developed and applied to a low-field resonance in gallium, for which the aspect ratio turns out to be 7.5.

A distinct increase of the reflectance of thin silver films for unpolarized light in the spectral region around twice the electron plasma frequency has been observed when plasma oscillations have been independently and separately excited in the film by a distinct source of $p$-polarized light at the plasma frequency. It is suggested that this observation is experimental evidence concerning the transformation process of an electromagnetic transverse wave into a longitudinal electrostatic wave.

We have measured the induced torque on a large number of spherical single crystals of potassium in the geometry employed in magnetoresistance investigations and have observed a large twofold anisotropy for all orientations at 4.2 K. The preferred direction required by this departure from cubic symmetry is a $〈110〉$ axis; which particular $〈110〉$ axis depends on the residual stress in the crystal.

The bizarre torque anisotropies observed by Schaefer and Marcus in single-crystal spheres of potassium show that the Fermi surface is neither simply connected nor of cubic symmetry. We show further that a charge-density-wave structure provides a complete account of the observed behavior.

In the system (${\left({\mathrm{V}}_{1-x}{\mathrm{Ti}}_x\right)}_2{\mathrm{O}}_3$, the antiferromagnetic insulating phase is suppressed for $x>\mathrm{}0.05\mathrm{}$. The linear term in the heat capacity is very large ($\gamma =192\mathrm{}\times {10}^{-4}$ cal °${\mathrm{K}}^{-2\mathrm{}}$ per mole of ${\mathrm{V}}_2$${\mathrm{O}}_3$), and the magnetic susceptibility at 4.2°K is 2 × ${10}^{-3\mathrm{}}$ emu ${\mathrm{mole}}^{-1\mathrm{}}$ giving a value $\frac{\chi }{\gamma }=1.8\mathrm{}$. The results are interpreted as evidence for a strongly correlated metallic phase.

The pressure dependence of the single-crystal elastic constants of ${\mathrm{V}}_3$Si and ${\mathrm{V}}_3$Ge has been measured from 77 to 298°K. The first pressure derivative of the shear modulus $c_s=\frac{1}{2}(c_{11}-c_{12})$ is strongly temperature dependent and becomes negative at low temperature. For ${\mathrm{V}}_3$Ge, an abnormally large second pressure derivative of $c_s$ is found. The results are applied to the calculation of the microscopic and macroscopic Grüneisen parameters and to the pressure dependence of the structural transition in ${\mathrm{V}}_3$Si.

The polarization of the neutrons has been measured for the reaction T $\mathrm{}(p,n)\mathrm{}{}_{}{}^3{}_{}{}^{}\mathrm{He}$ at 0° for conditions where the incident beam is transversely polarized. The neutrons were observed to be highly polarized in the same direction as the incident proton spin, with values of the polarization transfer coefficient ${K_y}^y\left(0^{\circ }\right)$ ranging from +0.39 to +0.83. $R$-matrix calculations using published ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ level parameters of Werntz and Meyerhof do not agree well with our measurements.

Evidence from angular distributions and excitation functions of the reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, $\alpha$) ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ suggests the identification of the 7.20-MeV $0^{+}$ and 7.83-MeV $2^{+}$ states in ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ with the [220] quartet configuration—i.e., two $\mathrm{sd}$-shell $\alpha$ particles outside a ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ core. It appears that these states are populated via a "semidirect" mechanism that proceeds through the formation of doorway states in the incident channel.

The production of three ${\mathrm{He}}^4$ nuclei directly, as well as via intermediate ${\mathrm{Be}}^8$ states, was observed for the reaction ${\mathrm{Li}}^6$ + ${\mathrm{Li}}^6$ at bombarding energies between 2.0 and 13.0 MeV. The large peaks attributed to direct effects in the energy spectra were fitted using a simple model which assumed an $\alpha +d$ cluster structure for the ${\mathrm{Li}}^6$ nuclei and an interaction potential acting only between the deuterons.

Measurements of the $n-p$ and $n-\mathrm{C}$ coherent atomic scattering amplitudes are described. The results $a_{\mathrm{H}}=-3.740\mathrm{}\pm 0.003$ fm and $a_C=6.648\mathrm{}\pm 0.003$ fm were obtained by reflection measurements on seventeen various liquid mirrors with the neutron gravity refractometer, for which a more accurate method of evaluation is given. The mirrors were composed of the elements hydrogen, carbon, and chlorine. The atomic scattering amplitude of chlorine was found to be $a_{\mathrm{Cl}}=9.580\mathrm{}\pm 0.002$ fm. The new $a_{\mathrm{H}}$ is of importance for describing the $n-p$ system.

An upper limit to the electric field strength, such as that of the nonlinear electrodynamics of Born and Infeld, leads to dramatic differences in the energy eigenvalues and wave functions of atomic electrons bound to superheavy nuclei. For example, the $1s_{\frac{1}{2}}$ energy level joins the lower continuum at $Z=215\mathrm{}$ instead of $Z=174\mathrm{}$, the value obtained when Maxwell's equations are used to determine the electric field.