The spectral yield for photoemission reveals the presence in the conduction band of anthracene of a broad (∼0.65 eV) continuum of allowed states followed by four narrow (≲0.1 eV) bands approximately 0.2 eV apart. The Fermi level in the alkali or alkaline-earth metal is fixed relative to the energy bands of anthracene by a large density of surface states. The mean free path for energetic electrons in anthracene is estimated as 40 Å.

A two-band, Hartree-Fock model of an antiferromagnetic metal is constructed. It exhibits a first-order phase transition at the Néel temperature, an antiferromagnetic $\overrightarrow{\mathrm{q}}$ vector which is incommensurable with the lattice and varies slightly with temperature and interaction strength, a nonvanishing energy gap at the Néel temperature, a linear relationship between energy gap and Néel temperature, and a heat of transformation which varies quadratically with the Néel temperature.

We show that near the Gunn instability in semiconductors the plasma frequency is purely imaginary and goes to zero at the critical field.

It is shown that combined measurements of Ohmic and space-charge-limited conduction provide an effective means of locating localized energy levels in wide band-gap materials. The method is demonstrated by application to some new experimental results on HgS.

The $g$ factor of the second, $I^{\pi }=2^{+}$, two-phonon vibrational state in ${\mathrm{Pd}}^{106}$ has been measured to be $g=0.370\mathrm{}\pm 0.071$ using the internal magnetic field of Pd in Fe.

When charged-particle nuclear spectra are used to determine the location and width of an energy level in a nucleus with a moderately short lifetime for charged particle decay, corrections for final-state Coulomb interactions can sometimes be very important. The effect is illustrated by application to the 16.62- and 16.92-MeV levels in ${\mathrm{Be}}^8$ produced by the reaction ${\mathrm{Li}}^6({\mathrm{Li}}^6, \alpha ){\mathrm{Be}}^8$.

A "spin filter" for selecting metastable hydrogen, deuterium, or tritium atoms with a given nuclear spin magnetic quantum number ($m_I$) has been built and tested. With the device installed in the Los Alamos "Lamb-shift" polarized-ion source, we have obtained a deuterium negative-ion beam with ∼ 55% spin-state purity for $m_I=1, 0, or -1\mathrm{}$. An improved magnetic field homogeneity in the apparatus is expected to increase the purity to ∼ 75%.

Electromagnetic interactions in nuclei are described in terms of effective operators for valence (open-shell) nucleons only. The effective operators are calculated theoretically from a realistic nucleon-nucleon potential (Yale-Shakin) in terms of excitations and de-excitations of particle-hole pairs of the core nucleons. The theory is successfully applied to ${\mathrm{Sn}}^{116}$ whose states are described in terms of the two- and four-quasiparticle Tamm-Dancoff theories involving valence neutrons only.

The percentage violation of reciprocity in the cross sections of direct rearrangement reactions is investigated and is shown to be of the same order of magnitude as the percentage strength of the violating force.

Abundant production of the established $L$ meson and also of the possible $Q$ meson are observed in coherent production, $K^{-}d\to K^{-}{\pi }^{+}{\pi }^{-}d$, at 12.6 BeV/c. This is the first observation of $L$-meson production on nuclei. The $Q$ and $L$ isospins are unambiguously determined to be ½. The $L$ is observed to be produced polarized. A striking resemblance between the final states $K^{*}\mathrm{}\left(890\right)\mathrm{}\pi d$ and $K^{*}\mathrm{}\left(1400\right)\mathrm{}\pi d$ is observed with these final states being related to the $Q$ and $L$ mesons, respectively.

The energy spectrum of neutrons emitted following the capture of negative muons in silicon, sulfur, and calcium has been measured between 7.7 and 52.5 MeV. The spectra were found to decrease exponentially with energy in the three cases, and no evidence was found for excitation of giant dipole resonances.

We have measured the asymmetry in the angular distribution of neutrons emitted following the capture of negative muons in silicon, sulfur, and calcium. The asymmetries, normalized to 100% muon polarization, varied from near zero for low neutron energies to +0.32±0.05, +0.30±0.08, and +0.20±0.08 for energies greater than 15.6 MeV for silicon, sulfur, and calcium, respectively, in disagreement with the results of most other recent experiments.

The theoretical predictions for the ${}_{}{}^{37}{}_{}{}^{}\mathrm{Cl}$ solar-neutrino experiment are summarized and compared with the experimental results of Davis, Harmer, and Hoffman. Three important conclusions about the sun are shown to follow.

Using a model proposed earlier and experimental proton form factors, the high-energy elastic $\mathrm{pp}$ scattering cross section is computed.

Implications of discrepancies between different experimental determinations of the parameter $\xi$ in $K_{l3\mathrm{}}$ decay are discussed. In particular, it is pointed out that (a) the presence of a scalar interaction less than the present experimental upper limit will have a large effect on $\xi$, and (b) different experimental determination of $\xi$ could be used to test electron-muon universality.

Reported here is the low-temperature observation of the hindered-rotation spectral lines of HCl and of C${\mathrm{H}}_3$ within C${\mathrm{H}}_3$C${\mathrm{H}}_2$Cl. This is accomplished by the technique of Schottky-barrier bulk point tunneling spectrometry.