A previously published unified theory of electromagnetic and weak interactions proposed a mixing between two types of unit-spin mesons, one of which would have precisely the characteristics of the newly discovered neutral resonance at 3.1 GeV. With this interpretation, a substantial fraction of the small hadronic decay rate can be accounted for. It is also remarked that other long-lived particles should exist in order to complete the analogy with ${\rho }^0$, $\omega$, and $\varphi$.

We propose that the recently discovered resonance in $e^{+}{e}^{-}$ annihilation is a member of the 15 ⊕ 1 dimensional representation of the SU(4) group. This hypothesis is consistent with the various experimental features reported for the resonance. In addition, we make a prediction for the masses of the charmed vector mesons belonging to the same representation.

The sinh-Poisson equation describing two-dimensional steady-state distributions of elements with a logarithmic interaction potential (charged filaments executing guiding-center motion; quantized vortex lines) is solved numerically. Multiple solutions are obtained for the case of negative temperatures. These have a simple thermodynamic interpretation which agrees with the results of numerical simulations. The results are related to numerical experiments and observations of vortex filaments in liquid ${\mathrm{He}}^4$.

The spectroscopy and weak couplings of a quark model with three charmed quarks are discussed in the context of recent results from Brookhaven National Laboratory, Stanford Linear Accelerator Center, and Fermi National Accelerator Laboratory.

The effects of new, heavy quarks are examined in a colored quark-gluon model. The $e^{+}{e}^{-}$ total cross section scales for energies far above any quark mass. However, it is much greater than the scaling prediction in a domain about the nominal two-heavy-quark threshold, despite ${\sigma }_{e^{+}{e}^{-}}$ being a weak-coupling problem above 2 GeV. We expect spikes at the low end of this domain and a broad enhancement at the upper end.

We argue that the newly discovered narrow resonance at 3.1 GeV is a ${}_{}{}^3{}_{}{}^{}S_1^{}{}_{}{}^{}$ bound state of charmed quarks and we show the consistency of this interpretation with known meson systematics. The crucial test of this notion is the existence of charmed hadrons near 2 GeV.

We discuss some possible interaction schemes for the newly discovered particle $J$ and their experimental implications, as well as the possible existence of two $J^0\text{'}\mathrm{s}$ like the $K_S-K_L$ case. Of particular interest is the case where the $J$ particle has strong interactions with the hadrons. In this case $J$ can be produced by associated production in hadron-hadron collisions and also singly in relative abundance in $\mathrm{ep}$ and $\mu p$ collisions.

This is a collection of comments which may be useful in the search for an understanding of the recently discovered narrow resonances at 3.1 and 3.7 GeV.

The spin-diffusion coefficient for spin-echo experiments is calculated in the $A$ phase and in the $B$ phase of superfluid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$, using a relaxation-time approximation. Spin-wave attenuation is discussed for long wavelengths. It is pointed out that Leggett's result for the NMR lineshift is true over the complete range of frequency.

Transverse NMR measurements on liquid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ are reported down to 0.7 mK at several pressures below 27 bar. In the $A$ liquid the quadratic NMR frequency shift is proportional to ${T_C}^2(1-\frac{T}{T_C})$. In the $B$ phase the integrated dynamic susceptibility falls to a limiting value which is 25% of the Fermi-liquid susceptibility. NMR data on the $A$ and $B$ liquids confined in the voids of fine powder are also presented.

It is shown how the renormalization-group ideas of Wilson can be applied to obtain the complete thermodynamic functions for general Ising models. The most singular term near the critical transition is given explicitly in terms of the renormalization-group transformations. As an example an approximate numerical solution is given to the original Ising model.

Energy-resolved photoemission-yield spectroscopy measurements are reported for transitions from $3d$ core levels to empty surface states and conduction-band states. Unoccupied surface-state bands are observed in the band gap with peaks about 0.2 and 0.9 eV above the valence-band maxima ($E_V$) of Ge(111) and GaAs(110), respectively. These surface-state bands cause the well-known Fermi-level ($E_{\mathrm{F}}$) pinning at the surface ($E_{\mathrm{F}}-E_V=0\mathrm{}$) for Ge(111) and the range of pinning ($E_{\mathrm{F}}-E_V=0\mathrm{} \mathrm{to} 0.6$ eV) for doped GaAs(110).

We report the first electroreflectance spectra obtained above 7 eV. The large number of new critical points observed includes a group in the energy range above 20 eV which occur between the $3d$ valence bands, derived from the deep-lying Ga $3d$ core levels, and the $s{p}^3$ conduction bands. The resolution, currently limited by the monochromator band pass, enables us to resolve directly the 0.50 ± 0.03 eV spin-orbit splitting of the Ga $3d$ core levels for the first time.

Fine structure is observed on cyclotron and spin-flip resonances of the holes in bismuth at far-infrared frequencies. The structure is interpreted in terms of the finalstate interactions of the excited electron-hole pair produced in the absorption. The binding energies of the inter-sub-band excitons calculated from a microscopic theory are in agreement with the experiments.

The reaction ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{15}{}_{}{}^{}\mathrm{C}$)${}_{}{}^{49}{}_{}{}^{}\mathrm{Ti}$ which involves the transfer of two units of charge and only a single unit of mass has been studied at 56 MeV. The magnitude of the forward-peaked angular distributions ($\frac{d\sigma }{d\Omega \simeq 25}$ μb/sr) is comparable to that observed for most of the few-nucleon transfers measured concurrently. The experimental results seem to imply that, in general, it may not be possible to ignore the contributions to cross sections originating from the more complex transfer processes.

The $g$ factor of the $8^{+}$ state of ${}_{}{}^{214}{}_{}{}^{}\mathrm{Ra}$ ($T_{\frac{1}{2}}=67\mathrm{}$μsec) has been determined to be $g=0.88\mathrm{}\pm 0.01$ by the in-beam $\gamma$-ray NMR method. The blocking effect of the $\left[{{\pi }_{\frac{11}{2}}}^{-1\mathrm{}}\pi h_{\frac{9}{2}}\right]-1^{+}$ - type core polarization on $g$ factors of $\pi {h_{\frac{9}{2}}}^n$ states is investigated. The observed blocking effect is much less than the theoretical expectation, implying that the correction to the $g$ factor of the $\pi h_{\frac{9}{2}}$ state because of [$\pi {h_{\frac{11}{2}}}^{-1\mathrm{}}\pi h_{\frac{9}{2}}$] $1^{+}$ excitation is comparable with that because of [$\nu {i_{\frac{13}{2}}}^{-1\mathrm{}}\nu i_{\frac{11}{2}}$] $1^{+}$.

A spatial interferometer for 10-μm wavelength which uses two independent telescopes separated by 5.5 m, heterodyne detection of the infrared radiation, and path equalization by a variable-length rf cable, has given interference fringes from radiation of the planet Mercury. Continuous fringe observations during 4000 sec indicate remarkable stability in the optical-path difference through the atmosphere and the two telescopes, fluctuations between 20-sec averages being about $\frac{1}{6}$ of the 10-μm wavelength.

Utilizing a four-antenna technique, we observed simultaneously, at each end of an 845-km baseline, the radio sources 3C279 and 3C273B which are 10° apart in the sky. Differences in interferometric phases at 3.7-cm wavelength monitored near the time of the 1972 occultation of 3C279 by the sun, yielded a gravitational deflection of 0.99±0.03 times the value predicted by general relativity, corresponding to $\gamma =0.98\mathrm{}\pm 0.06$ (standard error).

After the discovery of the $J$ particle at 3.1-GeV mass we have made an extensive search for heavier $J$ particles in the mass region 3.2 to 4.0 GeV. To a level of 1% of $J$ (3.1 GeV) yield, and with 90% confidence, no heavier $J$ particles were found.

In a study of $K^{+}d\to K^{*0\mathrm{}}\mathrm{}\left(890\right)\mathrm{pp}$ at $2.0 \frac{\mathrm{GeV}}{c}$, evidence is found for the occurence of the single-pion virtual state $d\to {\pi }^{-}\mathrm{}\left(\mathrm{pp}\right)\mathrm{}$ associated with the high-momentum tail of the deuteron.