A microwave radiometer has been used to search for pulses of radio waves from the the direction of the galactic center. The results were compared with data from Weber's gravitational-wave experiment. No strong evidence was found associating microwave pulses with pulses of gravitational radiation.

Etched tracks in an Apollo-12 spacecraft window and a Surveyor-3 camera-lens filter give the interplanetary Fe energy spectra from ∼1 to ∼30 MeV/nucleon during 1967-1969. The strongly energy-dependent Fe/He ratio suggests that heavy nuclei are preferentially emitted from accelerating regions because of their low ionization state and high magnetic rigidity. The Fe fluxes give rise to extremely high track densities that we have observed in lunar soil.

Ground based measurements of the cosmic background radiation at $\lambda =3.3\mathrm{}$ mm were made at two high-altitude sites. A weighted average of the two measurements corresponds to a blackbody temperature of 2.61±0.25 K.

We have studied the process $\overline{p}p$ into ${\pi }^{+}{X}^{-}$ using wire spark chambers. The data cover the angular range of ${{cos\theta }_{\overline{p}{\pi }^{+}}}^{*}$ between 0.96 and 1.0 at several incident momenta between 1 and 2 $\frac{\mathrm{GeV}}{c}$. The reaction $\overline{p}p\to {\pi }^{+}{\rho }^{-}$ was observed with ${\left(\frac{d\sigma }{d\Omega }\right)}^{*}$ of the order of 100 μb/sr at several momenta.

We report measured values of the asymmetry in the elastic scattering of $K^{+}$ mesons from polarized protons. The data were obtained at fourteen incident $K^{+}$ momenta from 1.33 to 2.58 $\frac{\mathrm{GeV}}{c}$; the approximate angular range covered was $-0.85<{{cos\theta }_K}^{\mathrm{c}.\mathrm{m}.\mathrm{}}<0.9\mathrm{}$. We compare our results with other available measurements and note several significant differences.

A study of the ${A_1}^{-}$ density-matrix elements shows that $s$-channel helicity is not conserved in the process ${\pi }^{-}p\to {A_1}^{-}p$ between 5 and 25 $\frac{\mathrm{GeV}}{c}$. Instead the ${A_1}^{-}$ density-matrix elements have simple behavior in the $t$-channel helicity frame. A new analysis of the ${A_1}^{-}$ cross section as a function of the incident ${\pi }^{-}$ momentum is also presented.

Expected properties of the $D^{\prime }$ (the ninth meson with $J^{\mathrm{PC}}=1^{++}$) include (a) assignment to a weakly mixed SU(3) singlet, predicted by duality; (b) a mass of ∼950 MeV, predicted by superconvergence; (c) decay modes $\eta \pi \pi$ and ${\pi }^{+}{\pi }^{-}\gamma$; and (d) the possibility of a suppressed $\rho$ signal in the ${\pi }^{+}{\pi }^{-}$ spectrum of the ${\pi }^{+}{\pi }^{-}\gamma$ final state, despite the expectation that the pions are in a state with $I=J=1\mathrm{}$. These features suggest that a recently reported meson near the mass with decay modes $\eta \pi \pi$ and ${\pi }^{+}{\pi }^{-}\gamma$ may be a candidate for this state.

We identify a small dimensionless parameter ${\eta }_P$ associated with the triple Pomeranchon vertex, which governs both the rate of high-mass diffractive dissociation processes and the fine structure in the $J$-plane spectrum near $J=1\mathrm{}$. Theoretical arguments are given that ${\eta }_P\lesssim 1-{\alpha }_P\mathrm{}\left(0\right)\mathrm{}$, and a possible experiment to measure ${\eta }_P$ is discussed. A formula for ${\eta }_P$, based on a multiperipheral model, shows that in such models this parameter does not vanish, and a connection of ${\eta }_P$ with a perturbation formalism for the Pomeranchon propagator is suggested.

New structure has been observed in the time-of-flight distribution of $\mathrm{H}\mathrm{}\left(2S\right)\mathrm{}$ atoms produced by electron bombardment of ${\mathrm{H}}_2$. The observed time-of-flight peaks are so located as to agree with the interpretation that the dissociative excitation proceeds predominantly through predissociation of intermediate bound states.

X rays emitted in collisions between heavy atomic particles were analyzed with a highly resolving Si(Li) detector. $L$ and $M$ x-ray spectra are shown for the collision systems $\mathrm{I}\to \mathrm{M}\mathrm{o},\mathrm{Y}\mathrm{b},\mathrm{a}\mathrm{n}\mathrm{d}\mathrm{A}\mathrm{u}$ at 17.6-, 34.0- and 57.0-MeV ion energy. The $L$ x rays of both colliding particles are shifted to higher energies compared with photon-induced characteristic x rays.

The observed oscillatory structures in the energy distribution of field-emitted ions are interpreted as due to discrete energy losses from multiple excitations of surface plasmons in the metal tip. The shape of the loss spectrum and its dependence on field strength agree with experiment. Plasmon losses are shown to influence the ion-energy distribution in field desorption of evaporation and may also affect the ultimate mass resolution of the "atom-probe" microscope.

Rayleigh scattering is the dominating stimulated scattering process when the absorption coefficient of the medium exceeds a critical value ${\alpha }_{\mathrm{cr}}$. It is found that the transient gain of Rayleigh scattering is important for the competition with stimulated Brillouin scattering. The initial slope- not the peak power- of the incident laser pulse determines the value of ${\alpha }_{\mathrm{cr}}$. Our findings are in full agreement with theoretical investigations.

Fisher's droplet model is applied to the calculation of the nucleation rate in a metastable supersaturated vapor near $T_c$. At a constant scaled supersaturation $A\propto \frac{(\mu -{\mu }_c)}{{(T_c-T)}^{\beta \delta }}$ we find a strong critical slowing down for the nucleation rate. Experiments to check this theory are proposed.

Dielectric breakdown in air induced by a train of subnanosecond laser pulses was found to occur as a sequence of strong point explosions, with each pulse producing breakdown at a different spot. The angular dependence of the scattered laser light was found to be due to the reflection and diffraction from the breakdown spots which were approximately spherical with diameters of about 9 μm. For atmospheric breakdown, analysis of results indicates that a plasma density as high as 7×${10}^{20}$ ${\mathrm{e}\mathrm{l}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{n}\mathrm{s}/\mathrm{c}\mathrm{m}}^3$ was created in the breakdown region.

A plasma heating and confinement system is described which is based on a toroidal stabilized pinch formed with relativistic electrons. The pinch is formed by inducing current in a hot electron plasma confined in toroidally shaped minimum-$B$ mirror fields. For parameters achieved with a mirror-confined hot electron plasma, current in the range ${10}^6$ to ${10}^7$ A carried by 10- to 100-MeV electrons is estimated to be attainable along with heating of a dense plasma background to a multi-keV temperature.

Measurements are described of the thermal expansion $\alpha$ of two samples of ${\mathrm{V}}_3$Si. One shows a large anomaly in $\alpha$ resulting from the structural transformation, which starts above 30°K and continues below the superconducting transition temperature $T_c$. The other sample shows only about 1% structural transformation, and the associated anisotropy in the discontinuity of $\alpha$ at $T_c$ shows that quadratic terms in the strain dependence of $T_c$ are unusually large.

The solution of the zero-field "eight-vertex" model is presented. This model includes the square lattice Ising, dimer, ice, $F$, and KDP models as special cases. It is found that in general the free energy has a branch-point singularity at a phase transition, with a continuously variable exponent.

A formula is given for the minimum eigenvalue of the operator of an infinitely long, one-dimensional anisotropic Heisenberg chain.

The questions of anomalies in the electrical resistivity and meniscus motion near the critical point of a binary metallic liquid with a miscibility gap are investigated from an experimental standpoint as well as from a simple model calculation.

To determine the wavelength dependence of the nonlinear susceptibility, measurements of second-harmonic generation have been made in the region of the first exciton absorption band in CuCl at 20°K. Results show a resonance behavior in the nonlinear susceptibility which is fitted by a theoretical curve.