Volume 20, Issue 6

D. H. Coward, H. DeStaebler, R. A. Early, J. Litt, A. Minten, L. W. Mo, W. K. H. Panofsky, R. E. Taylor, M. Breidenbach, J. I. Friedman, H. W. Kendall, P. N. Kirk, B. C. Barish, J. Mar, and J. Pine

Phys. Rev. Lett. 20, 292 (1968) - Published 5 February, 1968

Electromagnetic Mass Difference of Kaons

C. L. Cook, L. E. Evans, M. Y. Han, N. R. Lipshutz, and N. Straumann

Phys. Rev. Lett. 20, 295 (1968) - Published 5 February, 1968

Evidence for $N^{*}$ Regge Trajectory Clans with Approximate Parity Degeneracy

V. Barger and D. Cline

Phys. Rev. Lett. 20, 298 (1968) - Published 5 February, 1968

5- to 16-GeV Single- $π^{+}$ Photoproduction from Hydrogen

A. M. Boyarski, F. Bulos, W. Busza, R. Diebold, S. D. Ecklund, G. E. Fischer, J. R. Rees, and B. Richter

Phys. Rev. Lett. 20, 300 (1968) - Published 5 February, 1968

Momentum Dependence of the $k_{l 3}$ Decay Form Factors

M. Fitelson and E. Kazes

Phys. Rev. Lett. 20, 304 (1968) - Published 5 February, 1968

Conditions for the Validity of the Sum Rules ${g_{A_{1}}}^{2} {m_{A_{1}}}^{- 2} + \frac{1}{2} {f_{π}}^{2} = {g_{ρ}}^{2} {m_{ρ}}^{- 2}$ and ${g_{A_{1}}}^{2} = {g_{ρ}}^{2}$

Robert Perrin

Phys. Rev. Lett. 20, 306 (1968) - Published 5 February, 1968

ERRATA

Ultrasonic Propagation in RbMn $F_{3}$ Near the Magnetic Critical Point

Brage Golding

Phys. Rev. Lett. 20, 308 (1968) - Published 5 February, 1968

Physical Review Letters

Volume 20, Issue 6

LETTERS

Charge-Transfer Cross Sections for the Reaction $N_{2}^{+}$ + $O_{2}$ → $O_{2}^{+}$ + $N_{2}$ at Very Low Energies

Cross Section for the Production of Singly Ionized Helium by Electron Impact at Low Energies

Confirmation of the Discrepancy Between the Theoretical and Experimental Ground-State Energies of $H_{2}$

Collisions of Singlet Excitons in Molecular Crystals

Scattering of Light by Thermal Ripplons

Diffusion of Exchange Energy in Solid ${He}^{3 +}$

Sound Propagation Through a Dilute Solution of ${He}^{3}$ - ${He}^{4}$

Theory of Phase Separation in Solid ${}^{3}{He}$ - ${}^{4}{He}$ Mixtures

Electric Field Suppression of the Lambda Point in Liquid Helium

Domain Switching in Irradiated Ferroelectric K $H_{2}$ P $O_{4}$ Observed by Electron Spin Resonance

Measurement of Photoabsorption of the Lithium Halides Near the Lithium $K$ Edge

Interactions of Dislocations with Electrons in Metals

Nuclear Spin-Lattice Relaxation in Pure and Impure Superconducting Indium

Surface Nucleation Field $H_{c 3}$ of Pure Lead

Precession Measurements of the 0.847-MeV Level of ${Fe}^{56}$ Implanted in Iron After a ( $p, p^{'}$ ) Reaction

Measurement of Polarization in $π^{-} p \to π^{0} n$ and $π^{-} p \to η n$

Limit on Variation of $e^{2}$ with Time

Structure of High-Energy, Large-Momentum-Transfer Collision Processes

Zero-Degree Production of High-Momentum $π^{+}$ Mesons by $π^{-}$ Mesons Incident on Nuclei

Measurement of the Energy Dependence of the Form Factor in ${K_{L}}^{0} \to π + e + ν$ Decay

Electron-Proton Elastic Scattering at High Momentum Transfers