$\gamma$-ray intensities from 17 resonances with $J=3\mathrm{} \mathrm{to} 22$ final states in ${\mathrm{Dy}}^{164}$ reveal that there are significant correlations between partial radiative widths and reduced neutron widths. The two-particle, one-hole doorway-state concept and channel-capture mechanisms may be invoked to explain these correlations.

The tensor analyzing power $A_{\mathrm{yy}}$ of ${}_{}{}^4{}_{}{}^{}\mathrm{He}\mathrm{}(d,d)\mathrm{}{}_{}{}^4{}_{}{}^{}\mathrm{He}$ has been calibrated absolutely at ${\theta }_{\mathrm{lab}}={55}^{\circ }$, $E=7.07\mathrm{}$ MeV using the reaction ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(d,{\alpha }_1){}_{}{}^{14}{}_{}{}^{}\mathrm{N}_{}^{*}{}_{}{}^{}\mathrm{}\left(2.31\right)\mathrm{}$. A value of $A_{\mathrm{yy}}=-1.066\mathrm{}\pm 0.034$ was obtained.

The neutron-capture cross section of the 41-keV resonance in ${}_{}{}^{207}{}_{}{}^{}\mathrm{Pb}$ has been measured with improved resolution. Resonance asymmetry is not observed within the accuracy of the measurement and consequently there is no evidence for a significant nonresonant capture cross section.

The reactions ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}({}_{}{}^3{}_{}{}^{}\mathrm{He},t){}_{}{}^{27}{}_{}{}^{}\mathrm{Si}$ and ${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}({}_{}{}^3{}_{}{}^{}\mathrm{He},t){}_{}{}^{23}{}_{}{}^{}\mathrm{Mg}$ have been studied at a bombarding energy of 18 MeV. Within each nucleus angular distributions leading to states of the same spin and parity have been found to show a pronounced dependence on the configuration of the final state, contrary to previous suggestions. Such a dependence is consistent with the results of microscopic distorted-wave Born-approximation calculations.

A cosmic-ray experiment at Echo Lake, Colorado, employing a 2000-liter liquid-hydrogen target together with spark chambers and an ionization calorimeter has been performed to study the interaction of protons with protons above 70 GeV. We report here the quantitative results on the distribution of secondary charged-particle multiplicity and the energy dependence of the average charged multiplicity.

Following the idea that the electromagnetic and nuclear distributions behave similarly for large momentum transfers we examine the possibility of relating the deep inelastic electron scattering to large—momentum-transfer and high-energy inelastic proton-proton reactions.

We have observed a prominent peak in the energy spectrum of electrons ejected in the forward direction from helium bombarded by protons ranging in energy from 100 to 300 keV. The peak occurs at an ejected-electron velocity equal to the velocity of the incident proton. The experimental results verify the existence of the mechanism of charge transfer into continuum states of the incident ion.

We describe technique for the isolation and observation of iron atoms frozen into a rare-gas matrix. A large quadrupole interaction points to the existence of a stable iron molecule (${\mathrm{Fe}}_2$) in an argon matrix at $T=4.2\mathrm{}$°K.

Varney has recently applied random-walk methods to discuss the longitudinal diffusion of gaseous ions drifting in an electric field, and he obtained results which differ from those obtained by solution of the diffusion equation. Varney's analysis leads him to state that the measured longitudinal diffusion coefficients are not diffusion coefficients at all. Several arguments are presented here to refute Varney's findings.

A 2.7-Å band of the spectrum of ruby-laser light scattered by a plasma (20 eV, ${10}^{15}$ electrons/${\mathrm{cm}}^3$) in the presence of a magnetic field of about 15 kG has been isolated and passed through a 0.1-Å resolution interferometer. Magnetic modulation of the spectrum has been detected. There is reasonable agreement between the field strength calculated from the modulation and that measured by Faraday rotation.

The effect of a high-frequency toroidal electric field on equilibrium and stability of a toroidal plasma is considered. It is shown that for some values of the electric field, one can change the particle orbits considerably with important consequences to diffusion and stability.

Phonon dispersion curves have been measured by one-phonon coherent inelastic neutron scattering in the high-symmetry directions of TaC at room temperature and at 4.2°K (superconducting transition temperature $T_c\approx 10$°K). Pronounced structure is observed in the [001] and [110] directions for the longitudinal acoustic modes and, to some extent, for the longitudinal optic modes. By contrast, HfC ($T_c<1\mathrm{}$°K) exhibits little or no structure in these modes.

Photoluminescence of epitaxial GaAs in a magnetic field has established the origin of several recombination transitions 20 to 40 meV off the band edge. The data indicate that two acceptor levels are present in high purity material and that two free-electron-neutral-acceptor and two donor-acceptor pair bands are observed in photoluminescence at low temperatures.

Both the residual and ideal electrical resistivities of ${\mathrm{V}}_2$H approximate those of vanadium metal down to 4.2°K. The addition of hydrogen to the metal lowers the superconducting transition temperature. This is discussed from the standpoints of both lower crystal symmetry and higher electron-to-atom ratios.

Phonon interaction with the $I_1$ (4888-Å) emission line in CdS (exciton bound to a neutral acceptor site) has often been observed. For the first time the optical frequency anti-Stokes transition, involving the collapse of a bound exciton, has been observed in the emission from selected platelets at 1.2°K. Since the thermally excited phonon field at this temperature is negligible, the observation of anti-Stokes emission directly supports the conclusion that LO phonons are generated to a nonthermal level of distribution as the excitons decay.

The electric field gradient at the Al site in corundum has been estimated considering the Al-${\mathrm{O}}_6$ complex embedded in ${\mathrm{Al}}_2$${\mathrm{O}}_3$. The complete metal-ion-ligand overlaps have been taken into account. Our results in conjunction with the observed quadrupole coupling constant yield the value 0.148 b for the quadrupole moment of ${\mathrm{Al}}^{27}$, which is in very good agreement with the experimental value 0.149 b.

It is shown that for nuclear charge distributions the dominant effect of the Jastrow correlation factor is to produce a new uncorrelated Slater determinant which is calculated explicitly. This is related to the absence of the Brueckner-Pauli operator in the Jastrow correlation factor.

A theoretically based extension of the variable moment of inertia model is proposed and applied to the simultaneous analysis of ground-state rotational and $\beta$-vibrational or $\gamma$-vibrational bands. The results are in excellent agreement with experiment.

The neutron-proton total cross section has been measured to better than 1% in the energy range 25-60 MeV. The results agree with data at lower energies but are several percent higher than both previous measurements and current phase-shift predictions in this energy range.

The nuclei C, N, and O have been detected in the energy range 13-33 MeV/nucleon trapped in the radiation belt near the geometric equator in the region $2.5<~L<~5.5$ with an intensity ≥ 160 times the CNO flux level of interplanetary nuclei. The data were obtained over a 10-month period in 1968 by the University of Chicago nuclear composition telescope on the satellite OGO-5. The measured abundance ratio for these nuclei is $\frac{\mathrm{O}}{\mathrm{C}}\simeq 0.5$; this ratio is consistent only with an extraterrestrial origin for these nuclei.