The branching ratios for the decay of the ${\eta }^0$ meson into $3{\pi }^0$, ${\pi }^0\gamma \gamma$, and $\gamma \gamma$ have been measured. Under the assumption that no other neutral decays are significant, the results are $\frac{({\eta }^0\to 3{\pi }^0)}{({\eta }^0\to \gamma \gamma )}=0.88\mathrm{}\pm 0.16$ and $\frac{({\eta }^0\to {\pi }^0\gamma \gamma )}{({\eta }^0\to \gamma \gamma )}<~0.28$ (95% confidence-level upper limit).

We have measured the ratios $\frac{({\eta }^0\to \mathrm{neutral}\mathrm{decay}\mathrm{modes})}{({\eta }^0\to \mathrm{charged}\mathrm{decay}\mathrm{modes})}$ and $\frac{({\eta }^0\to {\pi }^{+}{\pi }^{-}\gamma )}{(\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0)}$ to be, respectively, 2.64 ± 0.23 and 0.28 ± 0.04. By combining these ratios with the results of the preceding Letter for the neutral modes, we obtain partial decay rates for the various ${\eta }^0$ decays. In particular, we obtain $\frac{({\eta }^0\to 3{\pi }^0)}{({\eta }^0\to {\pi }^{+}{\pi }^{-}{\pi }^0)}=1.58\mathrm{}\pm 0.25$, in good agreement with the assumption that the three-pion final state has $I=1\mathrm{}$.

High-energy ${\pi }^{\pm }p$ backward elastic-scattering data are analyzed in terms of $N_{\alpha }$ and ${\Delta }_{\delta }$ Regge exchanges. Using the signs of the Regge residues found from extrapolations to the particle poles (which agree with the signs obtained from interference with direct-channel resonances), we predict the ${\pi }^{-}p\to {\pi }^{0}n$ cross section near 180°.

From nmr measurements we have estimated the crystal-field splitting of an ortho-${\mathrm{H}}_2$ molecule in solid para-${\mathrm{H}}_2$ to be 8.2×${10}^{-3\mathrm{}}$°K. This lowers the existing upper limit on the splitting by a factor 5.

A Doppler-shifted open-orbit resonance in gallium is described. From the separation of corresponding attenuation peaks for $\pm n$, the effective electron drift velocity along the propagation axis is determined.

The nuclear magnetic resonance spectra of the dilute alloy systems FeCo, FeNi, FePd, FeSn, and FeV have been examined. The hyperfine distributions show satellites which are interpreted as due to ${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$ atoms with an impurity atom as a third, fourth, or fifth nearest neighbor. Satellites due to ${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$ atoms with an impurity atom as a nearest or second-nearest neighbor are not observed. A discussion of these results is presented.

Magnetic moment data are presented for high-purity Pd at 4.2°K. The magnetic moment is a linear function of $B$ up to 150 kG. On the basis of Wohlfarth's recent analysis of the high-field enhanced Pauli paramagnetism of Pd, the experiments determine limits of exchange enhancement for Pd and increase the minimum field for field-induced ferromagnetism in Pd.

The mass and width of the ${}_{}{}^7{}_{}{}^{}\mathrm{B}$ ground state have been measured using the reaction ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$(${}_{}{}^3{}_{}{}^{}\mathrm{He}$, ${}_{}{}^6{}_{}{}^{}\mathrm{He}$)${}_{}{}^7{}_{}{}^{}\mathrm{B}$, thus completing the mass-seven isospin quartet. During the course of the experiment new values for the excitation energies of the ${}_{}{}^8{}_{}{}^{}\mathrm{B}$ second excited state and the ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$ lowest $T=\frac{3}{2}$ states were found.

We have observed the inelastic scattering of 150-MeV electrons from tin-116, tin-120, and tin-124. The main $2^{+}$ and $3^{-}$ states have been studied. By comparison of the reduced transition probabilities $B_{\exp }(L\to 0)$ with the corresponding single-particle estimates $B_I(L\to 0)$, we have measured the collective character of these levels which changes appreciably from one isotope to another.

A search for ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ excited states in the reaction ${}_{}{}^3{}_{}{}^{}\mathrm{He}(p, p^{\prime }){}_{}{}^3{}_{}{}^{}\mathrm{He}_{}^{*}{}_{}{}^{}$ with proton bombarding energy of 30.9 MeV has been made. No inelastic peaks were observed.

The ratio $x=\frac{T(\frac{\Delta S}{\Delta Q}=-1)}{T(\frac{\Delta S}{\Delta Q}=1)}$ is determined from recent charge-asymmetry data in the processes ${K_L}^0\to {\pi }^{\pm }+e^{\mp }+\nu$ and ${K_L}^0\to {\pi }^{\pm }+{\mu }^{\mp }+\nu$. One obtains $\mathrm{Re}x=0.14\mathrm{}\pm 0.06$ and $\mathrm{Re}x=-0.16\mathrm{}\pm 0.24$, respectively.

An additive quark model (together with an isospin distribution of charge configurations) is used to establish sum rules connecting pion-nucleon with nucleon-nucleon induced multipion production cross sections. The resulting relations are shown to be well satisfied by present experimental data.