We propose a model satisfying current algebra and partial conservation of axial-vector currents, under certain approximations. The model leads to good fit with the experimental values for the low-energy $\pi -N$ scattering parameters.

The previously observed enhancement between 1100 and 1400 MeV in the $K\pi \pi$ mass spectrum is interpreted as a $T=\frac{1}{2}$, $J^P=1^{+}$ resonance at 1280±20 MeV and width of 130 ± 15 MeV which decays into $\pi +K^{*}$ and into $K+\rho$. Evidence is also presented supporting the existence of the newly reported $L$ meson.

We show that a Regge trajectory, $\alpha \mathrm{}\left(s\right)\mathrm{}$, cannot have the property $\mathrm{Re}\alpha \mathrm{}\left(s\right)\mathrm{}\to +\infty$ as $s\to +\infty$ without leading to inconsistencies with two features of dispersion theory and Regge pole theory: that both $\alpha \mathrm{}\left(s\right)\mathrm{}$ and the reduced residue function, $\gamma \mathrm{}\left(s\right)\mathrm{}$, are analytic in the cut plane with one cut, and that they and the partial wave amplitude, $a(l, s)$, for $\mathrm{Re}l=-\frac{1}{2}$, are bounded for large $\mathrm{}\left|s\right|\mathrm{}$ by $\exp [{\mathrm{}\left|s\right|\mathrm{}}^{\frac{1}{2}}-\epsilon ]$.

A proposed experiment which combines spin precession and two-slit interferometry of unpolarized neutrons is analyzed. The analysis elucidates the connection with a possible observation of the phase factor (-1) associated with the rotation of a half-integral spin particle through $2\pi$ radians.

Triton spectra were measured at 0 and 3° for the reaction $\mathrm{D}({}_{}{}^3{}_{}{}^{}\mathrm{He}, t)2p$ and at 5° for the reaction ${}_{}{}^3{}_{}{}^{}\mathrm{He}(d, t)2p$ at the same c.m. energy (21 MeV). The results were compared with predictions of the Watson-Migdal final-state interaction theory, and the proton-proton scattering length $a_p$ was determined for each reaction. Although the overall fit for the first reaction is poor, the best fit to the high-energy region of the data is obtained for $a_p=-12.6\mathrm{}\pm 0.6$ F. For the second reaction, $a_p=-7.3\mathrm{}\pm 0.6$ F gives a reasonably good overall fit.

The disintegration of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ nuclei was measured on silver targets at 22 MeV (lab). The measured total cross section of 175±30 mb has to be compared with a theoretical value of 96 mb. The elastic scattering of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ on Ag shows a large contribution of nuclear absorption.

Baryon inhomogeneities in the early high-density universe may account for the origin of galaxies. Any such inhomogeneity is amplified by baryon-pair annihilation as the universe expands and can eventually result in the formation of galaxies and antigalaxies. This process is more efficient than the usual process which assumes that the initial conditions of a structured universe are density fluctuations.

We present measurements of elastic electron-proton scattering cross sections in which both the scattered electron and recoil proton have been detected. Cross sections have been measured for a range of four-momentum transfers from 10 to 150 ${\mathrm{F}}^{-2\mathrm{}}$ with an estimated accuracy of between $3\frac{1}{3}$ and 10%.

An array of spark chambers and scintillation-counter trays has been used to search for fractionally charged particles in cosmic rays near sea level. No acceptable events have been found with energy losses by ionization between 0.04 and 0.7 that of singly charged minimum-ionizing particles. This experiment sets new upper limits for the fluxes of fractionally charged particles in cosmic rays, namely, 1.7×${10}^{-10\mathrm{}}$ and 3.4×${10}^{-10\mathrm{}}$ ${\mathrm{cm}}^{-2\mathrm{}}$ ${\mathrm{sr}}^{-1\mathrm{}}$ ${\sec }^{-1\mathrm{}}$ (90% confidence) for minimum-ionizing particles with charges $\frac{1}{3}$ and $\frac{2}{3}$, respectively.

The forward sum rule for $\pi \Sigma$ scattering is shown to be inconsistent with the currentalgebra scattering lengths. A further class of dispersion-theory sum rule shows that the dynamics of the ${\frac{3}{2}}^{+}$ resonances cannot be dominated by baryon exchange.

The simplest dynamical group including SU(3), O(3, 1)⊗ SU(3), is used to describe the decay widths of the $j^P={\frac{3}{2}}^{+}$ decuplet resonances. SU(3) breaking comes in naturally (and uniquely) through the mass differences in the multiplet. The only two parameters of the theory have been fixed in an independent fit of the $I=\frac{3}{2}$ baryon decay rates for different spins. The agreement with experiment is excellent.