Assuming that the low-lying states of doubly odd nuclei contain only the two lowest SU(4) supermultiplets, I have derived the following lower and upper limits on the magnetic moments of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}_{}^{*}{}_{}{}^{}$, and ${}_{}{}^{18}{}_{}{}^{}\mathrm{F}$, using only experimental data on superallowed Gamow-Teller transitions: $(0.800\mathrm{}\pm 0.016){\mu }_N<~\mu \left({}_{}{}^6{}_{}{}^{}\mathrm{Li}\right)<~0.88{\mu }_N$, $0.65{\mu }_N<~\mu \left({}_{}{}^{10}{}_{}{}^{}\mathrm{B}_{}^{*}{}_{}{}^{}\right)<~0.88{\mu }_N$, $0.66{\mu }_N<~\mu \left({}_{}{}^{18}{}_{}{}^{}\mathrm{F}\right)<~0.88{\mu }_N$. This shows that relativistic corrections to the magnetic moment of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ cannot exceed 7.3%.

Separable wave equations with source terms are presented for electromagnetic and gravitational perturbations of an uncharged, rotating black hole. These equations describe the radiative field completely, and also part of the nonradiative field. Nontrivial, source-free, stationary perturbations are shown not to exist. The barrier integral governing synchrotron radiation from particles in circular orbits is shown to be the same as for scalar radiation. Future applications (stability of rotating black holes, "spin-down," superradiant scattering, floating orbits) are outlined.

We have obtained about 4000 events above background which satisfy the two-constraint fit with the hypothesis $K^{\pm }\to {\pi }^{\pm }{\pi }^0\gamma$. Their Dalitz-plot population shows the existence of direct radiation in addition to that of the expected inner bremsstrahlung. The best fit to the sum of $K^{+}$ and $K^{-}$ decays in the charged-pion kinetic energy interval of 55 to 90 MeV gives a branching ratio for direct emission of (1.56 ± 0.35) × ${10}^{-5\mathrm{}}$, with a systematic uncertainty of ± 0.5 × ${10}^{-5\mathrm{}}$. No interference is required for a good fit.

Interference effects, due to quenching of the $n=1\mathrm{}$ exciton in the depletion layer of a GaAs-Au Schottky barrier at ∼ 1.8°K, are reported for the first time. The results bear out the strong dependence of the exciton reflectance line shape on the surface conditions (through local electric fields). It is shown that the reflecting boundary for the exciton polariton occurs at some depth from the surface, with known potential barrier, allowing quantitative investigation of spatial dispersion.

We have investigated the effect of the photoelectret state on lux-ampere and current-voltage characteristics of a CdS photoconductor. A shift in the lux-ampere and current-voltage characteristics is observed towards illumination and voltage axes, respectively. A percentage deviation as large as 30% is observed under polarization conditions defined by (a) an illumination intensity of 68 lx, (b) an electric field of 0.5 kV/cm, and (c) a time of 60 sec. Convergence of lux-ampere characteristics at high illumination level is explained by saturation of photopolarization with time.

We propose a new assignment for the ultraviolet optical spectra of II-IV-${\mathrm{V}}_2$ chalcopyrite crystals. The doubling of the number of optical transitions relative to III-V zinc-blende compounds results from the differences between the cation pseudopotentials, and the regular ordering of the cations in the chalcopyrite structure.

Electric quadrupole and hexadecapole transition matrix elements have been measured in precision Coulomb-excitation experiments with ${\mathrm{He}}^4$ particles for seven even-even targets in the mass range $158\le A\le 170$. The values of the matrix elements $〈4^{+}\parallel M\left(E4\mathrm{}\right)\mathrm{}\parallel 0^{+}〉$ determined for ${\mathrm{Gd}}^{158,160}$, ${\mathrm{Dy}}^{162,164}$, and ${\mathrm{Er}}^{166,168,170}$ are 0.34 ± 0.11, 0.36 ± 0.10, 0.27 ± 0.10, 0.28 ± 0.11, ${0.06}_{-0.18\mathrm{}}^{+0.12\mathrm{}}$, ${0.20}_{-0.16\mathrm{}}^{+0.12\mathrm{}}$, and ${0.24}_{-0.18\mathrm{}}^{+0.14\mathrm{}}$, respectively. The $〈2^{+}\parallel M\left(E2\mathrm{}\right)\mathrm{}\parallel 0^{+}〉$ matrix elements were determined with a typical accuracy of about 1%. Model-dependent ${\beta }_2$ and ${\beta }_4$ deformation parameters are given.

We present excitation energies and transition intensities observed for $0^{+}$ states populated by the ($p,t$) reaction on nuclei near $N=50\mathrm{}$. Comparison of results on selected isotopes of Sr, Zr, Mo, and Ru shows an unexpected loss of neutron $L=0\mathrm{}$ transfer strength with increasing proton number.

A simple extrapolation technique is used to determine the normalization $C$ of the proton-deuteron tail of the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ wave function. With a wave function calculated using the Faddeev equations and the Reid soft-core potential we find ${\mathrm{}\left|C\right|\mathrm{}}^2\approx 2.8$, in fair agreement with the value ${\mathrm{}\left|C\right|\mathrm{}}^2\approx 2.2\pm 0.3$ estimated by Bolsterli and Hale in a modified phase-shift analysis of $p-{}_{}{}^3{}_{}{}^{}\mathrm{He}$ elastic scattering data.

Exact relations between two-nucleon overlap functions are first obtained. Restricting the two nucleons transferred to a single major shell, we then derive sum rules relating the difference between the sums of cross sections for two-nucleon stripping and pickup reactions on a given nucleus, to its single-particle occupation probabilities.

The (${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$) and (${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$) reactions have been studied on targets of ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{62}{}_{}{}^{}\mathrm{Ni}$, and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ at incident ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ and ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ energies of 104 and 78 MeV, respectively. The two reactions are observed to populate states in the residual nuclei with different strengths, depending on the $j$ values of the final states. These results are believed to be a consequence of the selection rules for these reactions and suggest that spectroscopic assignments are possible with the use of heavy-ion reactions to complement other measurements.

Half-lives and branching ratios for the Fermi $\beta$ decays of ${}_{}{}^{18}{}_{}{}^{}\mathrm{Ne}$, ${}_{}{}^{22}{}_{}{}^{}\mathrm{Mg}$, ${}_{}{}^{26}{}_{}{}^{}\mathrm{Si}$, and ${}_{}{}^{34}{}_{}{}^{}\mathrm{Ar}$ have been studied in experiments which employed a gas-transport system. The $\mathrm{ft}$ values for the last two are compared with the mirror decays of ${}_{}{}^{26}{}_{}{}^{}\mathrm{Al}_{}^m{}_{}{}^{}$ and ${}_{}{}^{34}{}_{}{}^{}\mathrm{Cl}$. A difference of (4.6 ± 1.7)% is observed for mass 34 and may be attributable to unexpectedly large charge-dependent mixing. Possible implications are discussed with respect to Cabibbo theory and the existence of an intermediate vector boson.

The elastic differential cross sections for ${\pi }^{-}-{}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ scattering have been measured for pions with kinetic energies 160, 170, 220, 230, and 240 MeV at laboratory angles from 15° to 77°. The cross sections are compared with the results of an optical-model calculation.

We have observed a quiet-time component of interplanetary electrons having energies above solar-wind energies and below those characterized as cosmic radiation. Its energy spectrum generally falls with energy from 18 keV to 1.8 MeV, but shows a feature in the 100-300-keV range. The observed temporal variations of the intensity suggest that the 18-100-keV portion is solar and the 0.3-1.8-MeV portion is galactic in origin. Solar and terrestrial neutron-decay electrons appear inadequate to explain the 100-300-keV feature.

A spectral feature at ∼ 200 keV in the recently observed intensity of interplanetary electrons is examined as to its possible solar, interplanetary, or galactic origin.

The conclusions of a paper of the above title by Hammer and Weber, recently published in this journal, are criticized.

It is shown that a mechanism recently proposed by Hammer and Weber to obtain dipole behavior for the nucleon electromagnetic form factors is incorrect.

Using the Duffin-Kemmer-Petiau (DKP) description of mesons, we are able to render simple SU(3) theory consistent with the supposedly "large" experimental value of $\frac{\Gamma (\eta \to \gamma \gamma )}{\Gamma ({\pi }^0\to \gamma \gamma )}=129\mathrm{}\pm 33$. After discussing $\eta -{\eta }^{\prime }$ mixing we make a prediction [uncertain because of large errors in ${\Gamma }_{\mathrm{tot}}^{\mathrm{expt}}\left({\pi }^0\right)$ and ${\Gamma }_{\mathrm{tot}}^{\mathrm{expt}}\left(\eta \right)$] of ${\Gamma }^{\mathrm{DKP}}({\eta }^{\prime }\to \gamma \gamma )={0.32}_{-0.32\mathrm{}}^{+0.99\mathrm{}}$ keV. This is at least 1-2 orders of magnitude lower than the Klein-Gordon (KG) prediction, ${\Gamma }^{\mathrm{KG}}({\eta }^{\prime }\to \gamma \gamma )=52\mathrm{}\pm 24$ keV, which in fact is almost ruled out by upper limits set by recent experiments.

The charge-transfer processes for the collisions $\mathrm{Li}+{\mathrm{Na}}^{+}\to {\mathrm{Li}}^{+}+\mathrm{Na}$ and $\mathrm{Na}+{\mathrm{Li}}^{+}\to {\mathrm{Na}}^{+}+\mathrm{Li}$ have been studied theoretically using the first six molecular states in a multistate impact-parameter approach (using the Born-Oppenheimer breakdown terms to couple the states). The results lead to a rather simple description of the charge-transfer process involving primarily transitions between the $1{}_{}{}^2{}_{}{}^{}\Sigma _{}^{+}{}_{}{}^{}$ and $2{}_{}{}^2{}_{}{}^{}\Sigma _{}^{+}{}_{}{}^{}$ states and between the $2{}_{}{}^2{}_{}{}^{}\Sigma _{}^{+}{}_{}{}^{}$ and $1{}_{}{}^2{}_{}{}^{}\Pi$ states of the Li${\mathrm{Na}}^{+}$ quasimolecule.

The energy dependence of the integral elastic-collision cross section for scattering of hydrogen and deuterium atoms by mercury at thermal energies has been measured. For hydrogen at ca. 1.4 × ${10}^5$ cm ${\sec }^{-1\mathrm{}}$ evidence has been found for a structure superimposed on the glory pattern. This can be attributed to two overlapping orbiting resonances and represents the first observation of quasibound vibrational-rotational levels of a diatomic molecule through scattering measurements.