Properties of a closed cosmological solution with the negative coupling parameter of the scalar field compatible with Mach's principle in the Brans-Dicke theory are summarized.

We examine the polarization properties exhibited by ${\rho }^0\text{'}\mathrm{s}$ and ${\omega }^0\text{'}\mathrm{s}$ in the reactions ${\pi }^{-}+p\to {\rho }^0+X^0$ and ${\pi }^{-}+p\to {\omega }^0+\mathrm{charged}\mathrm{particles}$ at 15 GeV/c. ${\rho }^0$ production is analyzed in the framework of the triple Regge model. The trajectory coupled to the ${\pi }^{-}$ ${\rho }^0$ is $\alpha \mathrm{}\left(t\right)=(-0.12\mathrm{}\pm 0.07)+(0.78\pm 0.21)t$ in good agreement with the $\pi$ trajectory. The properties of the system recoiling against the ${\rho }^0$ (off-shell $``{\pi }^{-}\text{'}\text{'}p$ reaction) are very similar to those of the final states of on-shell ${\pi }^{-}p$ reactions at the same center-of-mass energy.

A multipole expansion of the color gauge field is shown to yield selection rules and rate estimates for hadronic transitions between nonrelativistic quark-antiquark bound states. The non-Abelian character of the field is of critical importance in determining the selection rules for the leading ("allowed") transition.

We report a null search for neutral heavy leptons produced unaccompanied by muons in 400-GeV/c proton-nucleon collisions in a magnetized beam dump and decaying in vacuum downstream. The upper limit on $\sigma B$ for $L^0\text{'}\mathrm{s}$ with Feynman $x\gtrsim 0.2$ and ${\theta }_{\mathrm{lab}}\lesssim 10$ mrad with branching ratio $B$ into two charged particles is $\sigma B\lesssim 2.8\times {10}^{-35\mathrm{}}$ ${\mathrm{cm}}^2$/nucleon at the 90% confidence level for masses below 1.0 GeV/${\mathit{c}}^2$ and lifetimes between ${10}^{-10\mathrm{}}$ and ${10}^{-8\mathrm{}}$ sec.

We present the results of a search at Fermilab for the charmed meson, $D^{\circ }\mathrm{}\left(1865\right)\mathrm{}$, produced in association with a prompt muon by 300-GeV/c neutrons. We observe no significant enhancement in high-mass $K^{\pm }{\pi }^{\mp }$ systems and report, at the 95% confidence level, an upper limit of 200 nb/nucleon for the production of a pair of charmed particles and their subsequent decay into a $K^{\pm }{\pi }^{\mp }$ state and a prompt muon.

We present the results of a search for leptons produced in coincidence with a prompt muon in neutron-beryllium collisions at 300 GeV/c. The experiment was sensitive to trigger muons and associated leptons of both low momentum and low transverse momentum. A clear ${\mu }^{\pm }{\mu }^{\mp }$ signal was found, but no significant ${\mu }^{\pm }{e}^{\mp }$ signal was observed. We report an upper limit for associated charmed-particle production [${\sigma }_{C\overline{C}}·B(C\to \mu +X)·B(C\to e+X)$] of < 340 nb/nucleon, at the 95% confidence level.

The ratio of cross sections for producing fast ${\pi }^{+}\text{'}\mathrm{s}$ and ${\pi }^{-}\text{'}\mathrm{s}$ in association with a massive dilepton should be a strongly varying function of the mass of the pair, reducing at small mass to its value in the absence of a pair. For $\frac{{M_{\mu \mu }}^2}{s}>0.1\mathrm{}$, the $\frac{{\pi }^{+}}{{\pi }^{-}}$ ratio should fall by a factor of 1.7 in the reactions $p+\overline{p}\to \pi +\left({\mu }^{+}{\mu }^{-}\right)+X$ and $p+{\pi }^{-}\to \pi +\left({\mu }^{+}{\mu }^{-}\right)+X$, rise by a factor of 2.6 in $p+{\pi }^{+}\to \pi +\left({\mu }^{+}{\mu }^{-}\right)+X$, and fall by about 25% in $p+p\to \pi +\left({\mu }^{+}{\mu }^{-}\right)+X$.

The ($p, t$) reaction is employed for the first time to study the structure of the deformed, rare-earth, odd-odd nucleus, ${}_{}{}^{174}{}_{}{}^{}\mathrm{Lu}$. In addition to a number of levels that have been characterized in previous studies, we have seen the rotational band built on the ${\left[\pi {\frac{7}{2}}^{+}\mathrm{}\right(404), \nu {\frac{7}{2}}^{-}\mathrm{}(514\left)\right]}_{K=7\mathrm{}}$ configuration. This band is about 6% admixed with the ${\left[\pi {\frac{7}{2}}^{+}\mathrm{}\right(404), \nu {\frac{5}{2}}^{-}\mathrm{}(512\left)\right]}_{K=6\mathrm{}}$ band. In addition, we have observed intensity resulting from four-quasiparticle configurations related to the ground states of both ${}_{}{}^{176}{}_{}{}^{}\mathrm{Lu}$ and ${}_{}{}^{174}{}_{}{}^{}\mathrm{Lu}$.

The profile function for the collision of two heavy nuclei is calculated. In principle, the method used sums all contributing diagrams. The single-particle inclusive distribution is predicted for very-high-energy collisions.

$\gamma$-ray multiplicities have been measured as a function of the light-fragment atomic number $Z_3$ for the above reactions. The failure of the measured $\gamma$ multiplicities for deep-inelastic collisions to rise with decreasing $Z_3$, according to the rigid-rotation limit, appears more likely to be associated with a selective population of the low-$Z$ fragments by the lower-$l$ waves rather than with an incomplete relaxation of the rotational energy.

The shapes and angular distributions of continuum $\gamma$-ray spectra for ${}_{}{}^{174,175}{}_{}{}^{}\mathrm{W}$ and ${}_{}{}^{161}{}_{}{}^{}\mathrm{Yb}$, produced through (${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, $\mathrm{xn}$) reactions, have been measured down to $E_{\gamma }\simeq 300$ keV. Large negative anisotropies are observed at the lower energies, suggesting the existence of a dipole component in the yrast cascade. A simple model gives good agreement with the results.

Multiplicities as a function of $\gamma$-ray energy have been measured for continuum $\gamma$-ray spectra produced in argon- and calcium-induced reactions. A peak sometimes occurs in the multiplicity spectrum, indicating a correlation between $\gamma$-ray energy and multiplicity (spin). This correlation can be explained by rotational motion of the nucleus, suggesting basically prolate nuclear shapes. Absence of structure in the multiplicity spectrum is interpreted to indicate noncollective motion, and hence spherical or oblate shapes.

A simple model for nuclear surface vibrations in permanently deformed nuclei does well in reporducing electron scattering cross sections of rotational levels built on a $K^{\pi }=0^{-}$ intrinsic octupole vibration in ${}_{}{}^{238}{}_{}{}^{}\mathrm{U}$.

The distribution of giant quadrupole resonance strength in ${}_{}{}^{24,26}{}_{}{}^{}\mathrm{Mg}$ obtained from inelastic $\alpha$- and proton-scattering experiments and $\alpha$-capture experiments have now been shown to be compatible. The results show that the giant quadrupole resonance strength in ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ and ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$ is fragmented into several states or clusters of states and suggest that the giant quadrupole resonance states have very different ${\alpha }_0$-decay strength.

I report on a calculation of radiative muon capture on ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(g.s.) to ${}_{}{}^{12}{}_{}{}^{}\mathrm{B}$(g.s.), done within the framework of the impulse approximation and a standard shell-model description of the nucleus. It is shown that the photon asymmetry as well as polarization and alignment of the ${}_{}{}^{12}{}_{}{}^{}\mathrm{B}$ nucleus depends strongly on the magnitude of the induced pseudoscalar coupling. The effects of possible contributions of second-class axial currents are also studied.

In collinear geometry we have observed laser-excited, narrow resonances in fast beams of Na and Cs atoms obtained from ion beams by charge transfer collisions. Being very sensitive, the method is suited for measuring isotope shifts and hyperfine structure of isotopes far from stability provided by on-line mass separators. It may be used furthermore to study inelastic charge transfer from the energy-loss spectrum of the Doppler-shifted lines.

The azimuthal angular dependence and corresponding energy spectra have been measured for electrons ejected at 135° from the beam direction by autoionizing He atoms in the $\left(2\mathrm{}{p}^2\right){}_{}{}^1{}_{}{}^{}D$ and $\mathrm{}\left(2s2p\right)\mathrm{}{}_{}{}^1{}_{}{}^{}P$ states, which were excited by 2000-eV ${\mathrm{He}}^{+}$ ions scattered through 6°. The data show a marked dependence on the azimuthal angle of the scattered projectile and are used to calculate the moduli and phases of the population amplitudes of the magnetic sublevels excited.

An ultradense (>${10}^{19}$ ${\mathit{e}}^{-}$/${\mathrm{cm}}^3$), low-temperature (∼20 eV), $Z$-pinch plasma has been used for C${\mathrm{O}}_2$-laser-plasma interaction experiments at 10.6 μm. Anomalous transmission of radially incident, intense (∼${10}^{11}$ W/${\mathrm{cm}}^2$) laser radiation of 38 nsec full width at half-maximum has been observed to occur through the initially overdense plasma. $\frac{v_{\mathrm{osc}}}{v_{\mathrm{th}}}$ is calculated to be ≅ 0.9 at the critical surface, where holographic interferometry shows critical density scale lengths of 70 to 200 μm. The transmitted beam shows increased temporal modulation and a periodic spatial structure resembling Fresnel rings.

We have observed forward-facing slow wave shocks created by an obstacle in a magnetohydrodynamic flow in runs on a magnetohydrodynamic particle stimulation code. The shocks have a double-layer structure composed of the compressive and accompanying rarefactive slow-wave fronts.

The interfaces between a thin (∼20-Å) abrupt epitaxial layer of Ge grown on substrates of (111), (110), and (100) GaAs have been investigated with x-ray photoelectron spectoscopy. Observed changes in core-level binding energies have been directly related to the crystallographic orientation dependence of interface dipoles and variations of band-gap discontinuities. The orientation variation of the band-gap discontinuities is found to be a significant fraction (≈ ¼) of the total band-gap discontinuity.