The resonancelike excitation function and strong forward peaking of the isospin-non-conserving ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}(d,\alpha ){}_{}{}^{10}{}_{}{}^{}\mathrm{B}(0^{+},1)$ and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(d,\alpha ){}_{}{}^{14}{}_{}{}^{}\mathrm{N}(0^{+},1)$ cross sections can be reconciled by an appropriate choice of reaction mechanism interpreted in the strong-absorption model.

Polarization and differential cross-section measurements have been made for ${}_{}{}^{89}{}_{}{}^{}\mathrm{Y}\mathrm{}(p,p)\mathrm{}{}_{}{}^{89}{}_{}{}^{}\mathrm{Y}$ in the isobaric analog regions of the $2^{-}$ and $1^{-}$ states at 2.48 and 2.63 MeV in ${}_{}{}^{90}{}_{}{}^{}\mathrm{Y}$. An optical-model-plus-resonance analysis of the data indicates that these states can be described by a $d_{\frac{3}{2}}$ state coupled to the ${\frac{1}{2}}^{-}$ target spin. The admixture of $d_{\frac{5}{2}}$ and $s_{\frac{1}{2}}$ configurations in the $2^{-}$ and $1^{-}$ states, respectively, is found to be small. The spin sequence $2^{-}$, $1^{-}$ with the higher spin lower in energy is strongly favored.

We report the observation of the production in high-energy $K^{-}p$ interactions of four $\Sigma$ hyperon states, the $\Sigma \mathrm{}\left(1385\right)\mathrm{}$, $\Sigma \mathrm{}\left(1660\right)\mathrm{}$, $\Sigma \mathrm{}\left(1940\right)\mathrm{}$, and $\Sigma \mathrm{}\left(2280\right)\mathrm{}$. The properties of the $\Sigma \mathrm{}\left(1385\right)\mathrm{}$ and $\Sigma \mathrm{}\left(1660\right)\mathrm{}$ are in good agreement with previous observations. The $\Sigma \mathrm{}\left(1940\right)\mathrm{}$, in contrast to previous evidence, has a strong $\Sigma \pi$ decay mode which agrees with its assignment to the SU(3) ${\frac{5}{2}}^{+}$ octet. Finally, the existence of the $\Sigma \mathrm{}\left(2280\right)\mathrm{}$ has been confirmed and some of its decay modes exhibited.

Data are presented for the reaction $K^{-}d\to \Lambda {\pi }^{-}p$ at 910, 1007, and 1106 MeV/c in which the proton momentum is greater than 250 MeV/c. The $\Lambda p$ invariant-mass plot shows an enhancement at about 2130 MeV, similar to that found by Cline, Laumann, and Mapp. No enhancement is seen at about 1440 MeV in the $\Lambda \pi$ invariant mass. A simple two-step process describes our data as well as those of Cline, Laumann, and Mapp without the use of resonances.

We report the observation of an isospin-½ $K\pi$ enhancement at a mass of 1160 ± 10 MeV with a width of 90 ± 30 MeV from the reaction $K^{-}n\to K_1^{}{}_{}{}^0{\pi }^{-}n$ at 3.9 GeV/c.

We have measured the absolute differential cross section for photoproduction of neutral rho mesons from complex nuclei at a photon energy of 8.8 BeV. Using a two-parameter optical model, we have deduced a value for the total rho-nucleon cross section of ${30}_{-4\mathrm{}}^{+6\mathrm{}}$ mb. Application of the vector-dominance model results in a value for the rho-photon coupling of $\frac{\gamma _{\rho }^{}{}_{}{}^2}{4\pi }=1.1\mathrm{}\pm 0.2$.

This paper extends Veneziano's representation from $\pi \pi \to \pi \omega$ to $\Pi \Pi \to \Pi V$, where $\Pi \mathrm{}\left(V\right)\mathrm{}$ is a pseudoscalar (vector) SU (3) octuplet or singlet.

We show that the Hamiltonian suggested by Gell-Mann, Oakes, and Renner can be obtained as a spontaneous breakdown of chiral SU(3) ⊗ SU(3) symmetry.

The joint implications of Bjorken and Regge asymptotics are discussed for the structure function of electroproduction. It is suggested that for $q^2\to \infty$, the function $\nu W_2$ approaches a constant for large values of $\rho \equiv \frac{m\nu }{q^2}$.

A proton substructure model proposed earlier is used to analyze present data on high-energy $\mathrm{pp}$ angular distributions. The model satisfactorily describes differential cross sections over the entire momentum range 5-21 GeV/c and over the whole angular interval 0-90°, thus indicating existence of two hadronic core distributions of the proton.

It is shown experimentally that the superfluid fraction $\frac{{\rho }_s}{\rho }$ is continuous and finite at the point at which superflow vanishes in unsaturated helium films. It follows that there is a region of superfluidity without superflow. In addition it is shown that the behavior of the partial molar entropy may account for the disappearance of superflow without requiring that $\frac{{\rho }_s}{\rho }$ vanish.

It has been found that various properties of liquid metals are interpretable in terms of a hard-sphere model. Since electronic screening of pair interactions in metals leads to density-dependent hard-sphere diameters, we have examined the effect that this has on the thermodynamic equations. The virial equation is shown to contain extra contributions to the pressure and compressibility which are quite relevant for metallic systems. The behavior of alkali metals is discussed.

A closed-form equation for the chemical potential as function of density and temperature, based on the scaling idea, is fitted to experimental data in the critical regions of ${\mathrm{Co}}_2$, Xe, and ${\mathrm{He}}^4$, optimizing $\delta$, $T_c$, and two adjustable constants. Values obtained for the critical exponents and the two constants vary only slightly from substance to substance; we find $\beta =0.35\mathrm{}-0.36$, $\delta =4.4\mathrm{}-4.6$, implying $\gamma \sim 1.25$, $\alpha \sim 0.05$; $\frac{\Gamma }{{\Gamma }^{\prime }}=3.6\mathrm{}-4.4$, $\Delta =2.6\mathrm{}-3.3$. Agreement with previous estimates and with independent $C_v$ and optical-density-gradient measurements is discussed.

We investigate the nonequilibrium properties of $N$ distinguishable, classical, point particles on a ring of length $L$, in the limit $N$, $L\to \infty$ and $\frac{N}{L}\to d$, the dynamics consists of a velocity-dependent probability of penetration. In particular, we identify the eigenvectors of the Liouville equation and find the corresponding eigenvalues, the real portions of which are the negative inverse relaxation times.

Three-layer systems [ferro-super-ferro (FSF)] with very thin insulating junctions between S and both F layers have been prepared. The superconducting transition temperature $T_{c\uparrow \uparrow }$ (when both F magnetizations are parallel) is lower than $T_{c\uparrow \downarrow }$.

Far-infrared absorption spectra of KBr crystals containing ${\mathrm{Li}}^{+}$, ${\mathrm{Na}}^{+}$, ${\mathrm{Sm}}^{++}$, ${\mathrm{OH}}^{-}$, and ${\mathrm{F}}^{-}$ are shown all to have sharp discontinuities at 74.8, 75.2, 85.5, and 89.5 ${\mathrm{cm}}^{-1\mathrm{}}$. It is shown by comparison with dynamical models for the lattice and the defect that these frequencies correspond closely to expected van Home singularities in the host lattice. These experiments, when extrapolated to zero defect concentration, provide accurate measurements of certain phonon frequencies in the pure lattice.

The photoabsorption structure of thin films of solid xenon has been investigated near the $N_{\mathrm{IV},\mathrm{V}}$ edge (∼66 eV) and compared with the structure of gaseous Xe. As Baldini found in the fundamental absorption region, excitonlike peaks as well as interband transitions have been found in the solid. The data are discussed in view of recent band calculations.

Specific-heat and magnetic-susceptibility measurements on very dilute Cu(Cr) alloys are reported. As in Cu(Fe), a zero-field susceptibility inversely proportional to the square root of temperature down to 14 mK is seen. A specific-heat peak at 0.35 K is observed. Thus it is now possible to make a detailed comparison between two simple dilute magnetic alloys differing primarily with respect to their Kondo temperatures.

We demonstrate that the local field at the site of atomic sources in anisotropic dielectrics can be determined from measurements of the spatial distribution of magnetic dipole radiation.

We discuss the dynamical fission barrier, and show the theoretical plausibility of the barriers used in statistical-model calculations.