It is observed that an anharmonic treatment of the low-lying collective modes in vibrational and transition regions is consistent with detailed theoretical calculation and with experimental static quadrupole moments and other systematic experimental data in even-even nuclei. The resulting effect on even-odd nuclei is to provide a significant improvement in the coupling scheme.

We have bombarded separated Sn and Te isotopes with ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ projectiles in order to study the (${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$, $\mathrm{xn}$) reactions and evaluate them as a means to produce excited nuclei for spectroscopic studies. This proves to be an excellent method for populating ground-band collective levels, and such levels have been identified in the 88-, 90-, and 92-neutron Er and Yb isotopes.

The cosmic background temperature measured at 9.24 mm is 3.16±0.26°K, which is consistent with measurements at longer wavelengths.

We have studied how a small time-reversal—noninvariant term in the Hamiltonian of a complex system affects the theoretical statistical distributions of its energy levels. We find that the major effect on the nearest-neighbor spacing distribution is in its shape near the origin. Thus, it is concluded that experimental observation of such a term by measurement of statistical distributions of energy levels is very difficult. However, one can find an upper bound to the strength of such a perturbation by such measurements.

Explicit calculations show that daughter trajectories are very model dependent. It is therefore necessary to be cautious in applying Lorentz symmetry when the energy is not zero.

The hypotheses of partially conserved axial-vector currents and of current commutators are used to prove a direct relationship between the radiative absorption of soft pions and muon capture in nuclei without recourse to the impulse approximation or assumptions concerning nuclear structure.

Within the framework of vector-meson dominance, the current-mixing model is shown to be the only theory of $\omega -\varphi$ mixing consistent with Weinberg's first sum rule as applied to the vector-current spectral functions. Relations among the leptonic decay rates of ${\rho }^0$, $\omega$, and $\varphi$ are derived, and other related processes are discussed.

We present a calculation modeled after the theory of phase transitions to explain the observations on self-trapped filaments of laser light in liquids. The resulting state is shown to be similar to the Abrikosov vortex state in superconductors.

In electric-field-induced Raman-scattering experiments on the cubic perovskite SrTi${\mathrm{O}}_3$, a striking electric field shift and splitting of the "soft" optical phonon mode is observed. Experiments were done at temperatures ranging from 8 to 250°K and for electric fields between 0.2 and 12 kV/cm. We interpret the temperature and electric field dependence of the phonon frequency using Devonshire model of ferroelectricity and the Lyddane-Sachs-Teller relation.

Electron tunneling measurements made on lanthanum-cerium alloy films show large deviations from the Abrikosov-Gor'kov theory of gapless superconductivity. It has been suggested that such deviations should occur for an alloy system such as cerium in lanthanum which exhibits resonant scattering.

An event has been observed in nuclear emulsion which is attributed to the decay of a ${}_{\Lambda }{}^{}{}_{}{}^{}\mathrm{Li}_{}^6{}_{}{}^{}$ hypernucleus, ${}_{\Lambda }{}^{}{}_{}{}^{}\mathrm{Li}_{}^6{}_{}{}^{}\to {\pi }^{-}+p+p+{\mathrm{He}}^4$, with a total binding energy of $B=3.92\mathrm{}\pm 0.37$ MeV relative to the free-particle system $\overline{\Lambda }+p+{\mathrm{He}}^4$.