It is suggested that the samples studied in recent Mössbauer experiments on CoO doped with ${}_{}{}^{57}{}_{}{}^{}\mathrm{Co}$ included microcrystals as well as polycrystalline bulk. This interpretation resolves the conflict concerning the temperature reversibility of the interconversion between the observed ferrous and ferric valence states, and is consistent with the cation-vacancy stabilization model.

The localized vibrations of Al in a Cu host lattice have been observed in a Cu-4% Al crystal by coherent inelastic neutron scattering. Both the local-mode frequency and the $\overrightarrow{\mathrm{q}}$ dependence of the neutron scattering cross sections are in good agreement with a calculation based on a mass-defect theory.

We have investigated the long-range alpha (LRA) fission neutrons of ${\mathrm{Cf}}^{252}$ in a four-parameter correlation experiment and found the behavior of the average number of neutrons as a function of fragment mass and total fragment kinetic energy to be very similar in binary and LRA fission. We concluded that binary and LRA fission have essentially the same scission configuration and discuss the mechanism of alpha emission and the fragment stiffness coefficients also.

During an interval of one year near the minimum of the 11-yr sunspot cycle, an interpolated pattern of the interplanetary magnetic field has been compared with the photospheric magnetic field. This reveals a persistent pattern in the solar field extending over a wide range of heliographic latitude on both sides of the equator.

An upper limit for the flux of heavy stable fundamental particles in the primary cosmic radiation is presented which is about two orders of magnitude less than that suggested to explain the anomalous cosmic-ray muon spectrum.

Consistency relations among $\mathrm{pp}$, $p\overline{p}$, $\pi p$, and $\pi \pi$ diffraction scattering cross sections and the pion and nucleon form factors are derived on the basis of the multiple-quark-scattering picture of elastic scattering of hadrons. The pion form factor is found to be similar to the nucleon form factor and the charge radius of the pion is ${\mathcal{r}}_{\pi }\cong 0.65$ F in agreement with experimental evidence. The differential cross section for $\pi \pi$ diffraction scattering is found to be $\frac{4}{9}$ times that of $\pi p$.

It is shown that present data on photoproduction support the vector-dominance assumption for the hadron electromagnetic current, in direct tests which require almost no additional symmetry- or model-dependent assumptions. Agreement with predictions is obtained for both the angular distribution and the magnitude of the photoproduction cross section, over a wide energy range. New model-independent experimental tests of vector dominance in photoproduction are proposed.

Using polarized ${\Sigma }^{-}$ hyperons, we have measured the up-down asymmetry of leptons in the decay ${\Sigma }^{-}\to n{l}^{-}\overline{\nu }$. This leads to a value of $\frac{g_A}{g_V}={0.05}_{-0.32\mathrm{}}^{+0.23\mathrm{}}$, in reasonable agreement with the Cabibbo theory for leptonic decays.

An optimally convergent polynomial expansion has been used in determining the residues of pion and $\Lambda +\Sigma$ poles from $n-p$ and $K^{+}-p$ differential scattering cross sections. A new method of conservatively estimating the uncertainty is also described.

Stimulated thermal Brillouin scattering-a phenomenon which exists in absorbing media-has been experimentally investigated. The gain of a light amplifier was measured as a function of frequency, absorption coefficient, and time during the laser pulse. The striking difference between absorbing and nonabsorbing liquids was found to be in excellent agreement with theoretical predictions.

Measurements of the specific heat of In: Pb alloys of varying lead concentration were used to deduce the temperature and mean-free-path dependence of Maki's parameter ${\kappa }_1$. The most impure sample showed the strongest temperature dependence of ${\kappa }_1$ in complete disagreement with existing theories.

Strongly amplified magnetostatic mode echoes in a ferrite are observed at $X$-band frequencies and temperatures from 300 to 1.6°K. Echo formation is discussed in terms of a mechanism in which the resonance frequency of a mode is a function of its amplitude of excitation.

The magnetization of ${\mathrm{Fe}}^{2+}$ in Mn${\mathrm{F}}_2$, measured in terms of its magnetic hfs interaction, exhibits a critical exponent $\beta$ equal to that of the host lattice. The large change in the coefficient $D$ is ascribed to the effects of anisotropy and to the difference between the Fe-Mn and Mn-Mn exchange.