Time-independent reductions in recoilless fractions have been observed in the Mössbauer effect following simultaneous Coulomb excitation of the first excited states of ${\mathrm{W}}^{183}$ and ${\mathrm{W}}^{182}$ in W${\mathrm{O}}_3$. These results are not in agreement with models predicting only a local temperature increase following excitation, but can be understood in terms of long-lived radiation damage effects.

Field-emitted electrons from EuS-coated W tips cooled to below 21 K show spin polarization of up to (89 ± 7)%. The preferential direction of the magnetic moments of the electrons is parallel to the magnetization of the emitter. The high spin polarization is explained in terms of emission from spin-polarized $4f^7$ states of ferromagnetic EuS or in terms of emission assisted by interaction with these states.

The decay route of the methyl vibrations in ethanol excited by stimulated Raman scattering is shown to be a splitting into daughter vibrations of half the frequency. Measurements of the growth and the decay of these daughter vibrations are reported for the first time using picosecond probe techniques.

An enhanced Bohm-like diffusion across a magnetic field observed in a germanium plasma near thermal equilibrium can be interpreted in terms of vortex diffusion due to plasma convections which are thermally excited. Both theoretical analysis and numerical simulation show good agreement with the experimental observations.

The dynamical behavior of the normal fluid phase of liquid ${\mathrm{He}}^3$-${\mathrm{He}}^4$ mixtures near the tricritical point is studied. The superfluid order parameter and the entropy fluctuation are shown to have a common characteristic frequency which is the same as that predicted by dynamical scaling for the characteristic frequency of second sound in the ordered phase. The concentration fluctuation is shown to have a smaller characteristic frequency. The critical anomalies of the transport coefficients also are determined.

A numerical technique is used to solve equations which describe growth of a barium cloud in the ionosphere, including arbitrary end-shorting ratio $\lambda$. For $\lambda$ corresponding to actual releases, one finds growth of a limited range of wavelengths $k$ grouped around a maximum growing $k$. The growth rate and $k$ range are sensitive functions of electric field $E$ and $\lambda$. Stability occurs below a critical $E$ and for strong shorting. The growing modes are localized on the rear of the cloud. All modes are unstable for no shorting.

The nonlinear saturation spectrum of parametric instabilities is shown to be restricted to discrete values of the propagation vector if spontaneous emission is neglected and a one-dimensional analysis is used. The purely growing instability is not excited for equal ion and electron temperatures if the power is less than 3.5 times the threshold power. The inadequacy of the present one-dimensional treatment is pointed out, and it is shown that waves with propagation vectors that are not parallel to the pump field must be present even if spontaneous emission is neglected.

By means of a computer experiment, using the method of molecular dynamics, evidence has been obtained for logarithmic terms in the density expansion of the diffusion coefficient for the two-dimensional Lorentz gas.

Pressure-volume data for EuO to 400 kbar are presented. An electronic collapse in the Eu ion involving the promotion of a $4f$ electron to the $5d$ state occurs near 300 kbar at room temperature. The structure remains NaCl type in this transformation. The transition appears to be first order and is from semiconductor to the metallic state. The collapsed NaCl phase undergoes a phase change to the CsCl-type structure near 400 kbar.

The anomalous Hall effect is measured InSb at low temperature. In this nonmagnetic semiconductor the polarization of the conduction electrons is obtained by application of an external magnetic field $B_0$. The spin-dependent Hall effect is separated from the much larger ordinary Hall effect by magnetic resonance of the conduction electrons. Two physical mechanisms responsible for the anomalous Hall effect are separated and the experimental results agree within a factor of 2 with the theoretical predictions without any adjustable parameter.

We show that steady translation of a magnetic bubble possessing Bloch lines requires the application of both longitudinal and transverse field gradients. The predicted longitudinal gradient obeys the usual relation valid for a normal bubble. The transverse gradient is proportional to the product of velocity and number of Bloch lines. Experiments of Tabor et al. support the theory.

The elastic scattering of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ on ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ has been measured for incident beam energies of $E_{\mathrm{lab}}=24,28, \mathrm{and} 32$ MeV at center-of-mass angles up to 150°. The angular distributions exhibit pronounced oscillations at backward angles which may be interpreted as due to the occurrence of an elastic transfer.

We present preliminary results from a sample of ∼ 1200 events obtained from an exposure of the 30-in. Argonne National Laboratory—National Accelerator Laboratory liquid-hydrogen bubble chamber to 102-$\frac{\mathrm{GeV}}{c}$ protons. The elastic and total inelastic cross sections are respectively 6.9 ± 1.0 and 32.8 ± 1.1 mb. The parameters of the multiplicity distribution for negative tracks are $〈n_{-}〉=2.17\mathrm{}\pm 0.07$, $D_{-}^{}{}_{}{}^2=〈n_{-}^{}{}_{}{}^2〉-{〈n_{-}〉}^2=2.56\mathrm{}\pm 0.12$, and $f_2^{}{}_{}{}^{-}=D_{-}^{}{}_{}{}^2-〈n_{-}〉=0.39\mathrm{}\pm 0.10$.

The mass spectrum of charged $A_2$ mesons has been measured in the reaction ${\pi }^{\pm }p\to p{X}^{\pm }$ at 4 $\frac{\mathrm{BeV}}{c}$. More than 3700 events per 5-MeV bin have been recorded at the $A_2^{}{}_{}{}^{+}$ peak. More than 2600 events per 5-MeV bin have been recorded at the $A_2^{}{}_{}{}^{-}$ peak. The standard deviation of the experimental resolution function is 3.9 MeV. The $A_2^{}{}_{}{}^{+}$ and $A_2^{}{}_{}{}^{-}$ mass spectra have shapes compatible with a simple Breit-Wigner resonance on a linear background.

We describe an extension of the Michigan $g$-factor work that permits measurement of the $g-2$ precession frequency of free leptons by a resonance technique. Preliminary results with electrons (accurate to about 100 ppm in the anomaly) indicate that the technique may be of use in various future experiments.

A new resonant wave with unknown isospin and $J^P={\frac{7}{2}}^{-}$ (${\frac{9}{2}}^{-}$ not completely excluded) is found to be necessary in order to explain the energy dependence of the higher Legendre polynomial coefficients ($A_6$, $A_7$, and $A_8$) in the expansion of the $K^{-}p$ elastic scattering differential cross section between 1937 and 1991 MeV. Assignment of this tentative resonance to a ${\frac{7}{2}}^{-}$ octet with the known $N\left(2190\right)\mathrm{}$ and $\Lambda \mathrm{}\left(2100\right)\mathrm{}$ is found to be reasonably good.

In theories with spontaneously broken local symmetries, renormalizability sometimes forces the scalar field interactions to have a larger group of symmetries than the gauge field interactions. Symmetries can then arise in zeroth order which are violated by finite higher-order effects, thus providing a possible natural explanation of the approximate symmetries observed in nature. Such theories contain spinless bosons which behave like Goldstone bosons, but which pick up a small mass from higher-order effects.

As a precise and model-independent test of SU(2) chiral breaking (${\epsilon }_3{u}_3$), the analog of the Coleman-Glashow formula for pseudoscalar mesons is derived, and it is found to be satisfied within 1%. The presence of the term ${\epsilon }_3{u}_3$ in the Hamiltonian density is therefore strongly supported by the experimental data.

Striking regularities in plots of ${\pi }^{+}p$ elastic differential cross-section data at fixed c.m. angles are exhibited, a simple interpretation in terms of strongly correlated resonances is proposed, and further experimental tests of this idea are suggested. A novel and simple method for the determination of resonance energies and total widths based on the proposed model is also pointed out.

We suggest, contrary to the spirit of the Amati-Fubini-Stanghellini multiperipheral model and a ${\varphi }^3$ ladder theory, that the relation ${\alpha }_{\mathrm{P}}\mathrm{}\left(0\right)=1\mathrm{}$ is independent of the strength of the strong interaction. We propose that the "zero strength" ($g\to 0$) limit of a future correct strong-interaction theory will collapse into a vector-type field theory, guaranteeing ${\alpha }_{\mathrm{P}}\mathrm{}\left(0\right)=1\mathrm{}$ even as $g\to 0$. The intercept of the leading non-Pomeranchukon exchange then becomes lower when $g$ increases. Specific models which are consistent with this approach lead to a new relation between this intercept and the moments of the multiplicity distribution.