The ideal electrical and thermal resistivities of pure Pd have been measured at temperatures from 2.5 to 19°K. The results yield an ideal Lorenz number ($L_i$) which has the value of 0.7×${10}^{-8\mathrm{}}$ ${\mathrm{V}}^2$/${\mathrm{deg}}^2$ and is independent of temperature below roughly 5°K. A comparison of these results with data on Re and Ni indicates that the low-temperature values of $L_i$ are parameters which are characteristic of the individual metals.

The anisotropic electron-paramagnetic-resonance spectrum of an erbium-doped single crystal of magnesium metal is characteristic of a uniaxially distorted ${\Gamma }_7$ doublet of the free-ion ${}_{}{}^4{}_{}{}^{}I_{\frac{15}{2}}^{}{}_{}{}^{}$ multiplet. The observed linewidth anisotropy is consistent with an isotropic conduction-electron-localized-electron exchange interaction.

The total cross sections for the reactions ${}_{}{}^7{}_{}{}^{}\mathrm{Li}(p, p^{\prime }){}_{}{}^7{}_{}{}^{}\mathrm{Li}\left(478\mathrm{} \mathrm{keV}\right)$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Li}(p, n){}_{}{}^7{}_{}{}^{}\mathrm{Be}\left(431\mathrm{} \mathrm{keV}\right)$ have been measured for proton energies between 23 and 52 MeV and compared with the predictions of a microscopic model of the reaction. The spin-flip, isospin-flip part of the effective interaction is found to be essentially independent of energy, whereas the pure central part appears to decrease with increasing energy.

Assuming the asymptotic validity of the nonet symmetry we calculate (1) electromagnetic decays of vector mesons, (2) the $\varphi \to K\overline{K}$ decay, and (3) the coupling constants for $\omega$ and $\varphi$ to baryons.

This deuterium bubble-chamber experiment gives an upper limit of 0.13% for the branching ratio $\frac{(\eta \to e^{+}+e^{-}+{\pi }^0)}{(\eta \to \mathrm{all}\mathrm{modes})}$ and indicates agreement with an ordinary Dalitz decay for $\eta \to e^{+}+e^{-}+\gamma$.

Relative intensities of muonic x rays have been measured for the $K$ series of Ca, S, Si, and Mg and $L$ series of Ca. $K_{\alpha }$ yields of all the elements are about 80% of the total $K$ lines. The relative intensities of Ca $K_{\gamma }$, $K_{\delta }$, $K_{\epsilon }$, and $K_{\zeta }$ x rays are almost constant and are about 2% of the total $K$ lines. A statistical initial distribution of muons in a high-$n$ state might be sufficient to explain the data if electron stripping effects are included in the calculations.

We propose a phenomenological model involving the cross-coupling of the allowed and forbidden epr transitions between electrons belonging to neighboring packets of an inhomogeneously broadened epr spectrum. This model yields all the observed qualitative features of the new effect in dynamic polarization previously reported.

Picosecond light pulses have been observed to appear spontaneously in ruby and Nd: glass lasers $Q$-switched by means of a rotating mirrot. This striking phenomenon is explained on the basis of coherence effects. The implication is that lasers with broad linewidths will quite generally tend to oscillate as pulse-regenerative oscillators.