Depolarization-current measurements in single crystals of naphthalene showed evidence of formation of a Schottky barrier during the polarization of the thermoelectret. The analysis of the results, according to the simple model of total ionization of centers, provides the value of 0.5 × ${10}^{12}$ ${\mathrm{cm}}^{-3\mathrm{}}$ for the number of ionized centers in the depleted layer.

The low-temperature specific heat of ${\mathrm{Ti}}_2$${\mathrm{O}}_3$ doped with 3.9% ${\mathrm{V}}_2$${\mathrm{O}}_3$ is compared with a theoretical model of a one-dimensional Fermi-Dirac gas proposed by Labbé and Friedel. Quantitative agreement is found between the model and the experimental results for a Fermi temperature of 5.3 K. The system under study furnishes an unusual example of an electron gas obeying a one-dimensional density-of-states function both for the extreme degenerate case and in the transition to the classical region.

We have determined the dispersion of three independent nonlinear optical susceptibilities, $\left|d_{15}\right|$, $\left|d_{31}\right|$, and $\left|d_{33}\right|$, for CdS and CdSe. Tunable dye lasers (0.73 to 1.0 μm) were used. In spite of the large absorption at the second harmonic and/or fundamental wavelengths, Kleinman's relation ($d_{15}=d_{31}$) holds. The ratio $\left|\frac{d_{33}}{d_{31}}\right|$ exhibits dispersion and deviates from Robinson's relation (ratio of 2). The relative phase angles between $d_{15}$ and $d_{31}$ and between $d_{31}$ and $d_{33}$ were measured at two wavelengths by a new reflection interference technique.

Extrapolations of high-field and high-temperature series expansions have been used to construct numerical approximations to the density of zeros $g\left(\theta \right)$ on the Lee-Yang circle for the Ising ferromagnets on a two-dimensional square and a three-dimensional diamond lattice. For temperatures above the critical temperature the density is zero for $\left|\theta \right|<\mathrm{}{\theta }_G$ and then varies as ${(\theta -{\theta }_G)}^{\mu }$, with $\mu \simeq -0.1\mathrm{} \mathrm{and} +0.1\mathrm{}$ for the square and diamond lattices, respectively.

Magnetic excitations in several single crystals of the systems K(Co,Mn)${\mathrm{F}}_3$ and (Co, Mn)${\mathrm{F}}_2$ have been studied by neutron inelastic scattering. It is found that two branches of well-defined magnetic excitatios, both of which exhibit propagating character, occur at certain compositions. The dispersion relation for two branches of propagating excitations cannot be adequately described by current theories, but an extension of Anderson's criterion for localization in disordered alloys gives approximate agreement with the observed character.

The tensor analyzing power of ($d,p$) transitions on ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$, ${}_{}{}^{25}{}_{}{}^{}\mathrm{Mg}$, ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ was measured at $E_d=12.3\mathrm{}$ MeV for ${\theta }_{\mathrm{lab}}=0-{50}^{\circ }$. The reactions studied included orbital angular-momentum transfers $l=0,1,2,3\mathrm{}$. Large values of $T_{20}$ were observed, negative near 0° for most transitions. Distorted-wave calculations show agreement with the data only when a $D$-state contribution is included in the deuteron internal wave function.

The distribution of ionic charges has been measured for ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ recoils from the elastic scattering of 10-MeV deuterons in carbon targets down to a thickness of 0.3 μg/${\mathrm{cm}}^2$. The charge distribution from the thinner targets is distinctly nonequilibrium, indicating that "instantaneous" effects of the atomic and nuclear processes which produced the recoils are being observed, unmodified by electron-exchanging interactions with matter.

When using the method of Lagrange multipliers in constrained variational calculations, certain regions of interest have in the past been inaccessible. A modified procedure is proposed which, as is shown both algebraically and numerically, circumvents this difficulty.

The angular variations of the $\mathrm{D}\mathrm{}(p,pn)p$ and $\mathrm{D}\mathrm{}(p,pp)n$ quasielastic scattering processes at $E_{\mathrm{inc}}=22.8\mathrm{}$ MeV are investigated. It is shown that the $\mathrm{D}\mathrm{}(p,pn)p$ data are incompatible with the simple impulse approximation and with models which include final-state interaction corrections to the simple impulse approximation. The behavior of the ratio of the $\mathrm{D}\mathrm{}(p,pn)p$ and $\mathrm{D}\mathrm{}(p,pp)n$ cross sections as a function of angle cannot be explained in terms of any simple model.

The ($d,t$) and ($p,d$) reactions on ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ have been studied at several energies below the Coulomb barrier. Relatively simple and parameter-free analysis yields the absolute normalization of the asymptotic tail for the neutron states near the Fermi surface. A wide range of Woods-Saxon potentials that match the binding energy and the asymptotic tail yield a rather unique value of the rms radius for the neutron excess, namely 5.99 ± 0.10 fm. This is very close to the radius deduced from Coulomb-energy differences.

New levels in ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$ with spins of ${\frac{9}{2}}^{+}$ and $\frac{11}{2}$ have been discovered at energies of 6592 ± 2 and 7937 ± 3 keV, respectively. It is suggested that these levels, together with the known 3907-keV (${\frac{3}{2}}^{+}$), 4549-keV (${\frac{5}{2}}^{+}$), and 5464-keV (${\frac{7}{2}}^{+}$) levels, form a $K={\frac{3}{2}}^{+}$ rotational band.

Measurement of $\gamma$-ray distributions from the reaction ${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}(\alpha ,n\gamma ){}_{}{}^{26}{}_{}{}^{}\mathrm{Al}$ confirms spin $J=5\mathrm{}$ for the 3404-keV level and gives an unambiguous spin assignment of $J=6\mathrm{}$ for the 3508-keV level. Measurement of lifetimes and mixing ratios show that both states have positive parity. The excitation energy and the enhanced $E2\mathrm{}$ strength of > 11 Weisskopf units for the $6^{+}$ to $5^{+}$ ground-state transition identify the level at 3508 keV as the $6^{+}$ member of a $K=5^{+}$ rotational band based on the ground state.

We have computed the spectrum and energy of gravitational radiation from a "point test particle" of mass $m$ falling radially into a Schwarzschild black hole of mass $M\gg m$. The total energy radiated is about $0.0104m{c}^2\left(\frac{m}{M}\right)$, 4 to 6 times larger than previous estimates; the energy is distributed among multipoles according to the empirical law $E_{2l-\mathrm{p}\mathrm{o}\mathrm{l}\mathrm{e}}\approx \left(\frac{0.44m^2{c}^2}{M}\right)e^{-2l}$; and the total spectrum peaks at an angular frequency $\omega =\frac{0.32c^3}{\mathrm{GM}}$.

We present some initial results of a detailed calculation of the cosmological $\gamma$-ray spectrum from matter-antimatter annihilation in the universe. The similarity of the calculated spectrum with the present observations of the $\gamma$-ray background spectrum above 1 MeV suggests that such observations may be evidence of the existence of antimatter on a large scale in the universe.

The inclusive reaction $\gamma +p\to {\pi }^{-}$ + anything is studied in the energy range $E_{\gamma }=5.5-15\mathrm{}$ GeV. Experimental data on the differential cross section $\frac{{\partial }^2\sigma }{\partial P_L\partial {P_T}^2}$ in the target fragmentation region are qualitatively similar in shape in different energy intervals, but the magnitude shows a significant decrease with $E_{\gamma }$ in this energy range.

The reaction $K^{+}+p\to {\pi }^{-}$ + anything with the ${\pi }^{-}$ fast and forward is analyzed with a peripheral representation that allows one to extract the two-body exotic-exchange amplitude with high statistics that are otherwise hard to come by. By representing the inclusive spectrum in a Reggeized scaled form, we then predict the energy dependence of the two-body reactions ${\pi }^{-}+p\to K^{+}+{\Sigma }^{-}$ and ${\pi }^{-}+p\to K^{+}+Y^{*-}\mathrm{}\left(1385\right)\mathrm{}$ in good agreement with the experimentally measured data.

A 20-standard deviation peak is observed at a mass of ${953.4}_{-2.\mathrm{}5}^{+1\mathrm{}}$ MeV and with a physical width $\Gamma <15\mathrm{}$ MeV, produced with ${\left(\frac{d\sigma }{d\Omega }\right)}_{\mathrm{c}.\mathrm{m}.\mathrm{},{60}^{\circ }}=2\mathrm{}\times {10}^{-35}$ ${\mathrm{cm}}^2$/sr in the reaction $p+d\to {\mathrm{He}}^3+$ missing mass. The incident proton energy was 3 BeV and the proton-to-meson and proton-to-${\mathrm{He}}^3$ transfers $t=-1.74\mathrm{}$ and $u=-4\mathrm{}{\left(\frac{\mathrm{BeV}}{c}\right)}^2$, respectively. The ${\eta }_0\mathrm{}\left(958\right)\mathrm{}$, ${\delta }^0\mathrm{}\left(963\right)\mathrm{}$, and ${\varphi }^0\mathrm{}\left(1019\right)\mathrm{}$ are not observed and the ${\rho }^0\mathrm{}\left(765\right)\mathrm{}$ not apparent in our data.

We present a new technique for analyzing multibody states. This analysis makes possible the selection of samples of events that contain only resonances, particle correlations, or phase space. A unique feature of this analysis is that every event in the data is assigned to a particular sample. The three-body final state ${\pi }^{+}+p\to p+{\pi }^{+}+{\pi }^0$ is analyzed as an example.

Linear Stark shifts and allowed electric dipole transitions have been observed for the first time in the ground electronic and vibrational state of a conventionally nonpolar molecule. By means of molecular-beam techniques, the electric dipole moment of C${\mathrm{H}}_4$ in its ground vibronic state has been determined to have a magnitude of (5.38 ± 0.10) × ${10}^{-6\mathrm{}}$ D.

Resonances for collisions of electrons with ${\mathrm{O}}_2$ and NO are studied by measuring the derivative of the current transmitted through NO and ${\mathrm{O}}_2$. In both these gases we find vibrational progressions of compound states. The spacings and Franck-Condon factors for these progressions agree with those of the respective positive ions. Thus it appears that these compound states consist of two Rydberg electrons loosely attached to the ion core.