Volume 33, Issue 4

S. R. Shannon, L. Anderson, A. Bridgewater, R. Chaffee, O. Chamberlain, O. Dahl, R. Fuzesy, W. Gorn, J. Jaros, R. Johnson, R. Kenney, J. Nelson, G. O'Keefe, W. Oliver, D. Pollard, M. Pripstein, P. Robrish, G. Shapiro, H. Steiner, and M. Wahlig

Phys. Rev. Lett. 33, 237 (1974) - Published 22 July, 1974

Measurement of the Branching Ratio $\frac{Γ ({K_{L}}^{0} \to π^{\pm} μ^{\mp} ν)}{Γ ({K_{L}}^{0} \to π^{\pm} e^{\mp} ν)}$

H. H. Williams, R. C. Larsen, L. B. Leipuner, W. W. Sapp, A. L. Sessoms, L. W. Smith, R. K. Adair, and R. Turner

Phys. Rev. Lett. 33, 240 (1974) - Published 22 July, 1974

Asymptotic Behavior of Non-Abelian Gauge Theories to Two-Loop Order

William E. Caswell

Phys. Rev. Lett. 33, 244 (1974) - Published 22 July, 1974

Is the Cross Section for $e^{+} e^{-} \to Hadrons$ Time Dependent in Colliding Beam Machines?

T. Goldman and Patrizio Vinciarelli

Phys. Rev. Lett. 33, 246 (1974) - Published 22 July, 1974

ERRATA

New Parameters for $Δ^{+ +}$ Resonances from 2170 to 3490 MeV IN $π^{+} p$ Backward Elastic Scattering

C. A. Rey, A. J. Lennox, J. Poirier, and K. P. Pretzl

Phys. Rev. Lett. 33, 250 (1974) - Published 22 July, 1974

Solving Equations of the Gell-Mannlow and Callan-Symanzik Type

B. F. L. Ward

Phys. Rev. Lett. 33, 251 (1974) - Published 22 July, 1974

Hadron-Neutron Forward Elastic Scattering Amplitude and Hadron-Deuteron Collisions

Victor Franco and Girish K. Varma

Phys. Rev. Lett. 33, 251 (1974) - Published 22 July, 1974

Physical Review Letters

Volume 33, Issue 4

Announcement

Comments on Letters

LETTERS

Atoms, Molecules, and Related Topics

Measurements of Fine Structures in Excited States of ${}^{4}{He}^{+}$ by Fast-Beam Radio-Frequency Resonance

Elastic and Inelastic Electron Scattering at 20 and 60 eV from Atomic Cu

Observation of Stimulated Anti-Stokes Raman Scattering in Inverted Atomic Iodine

Calcium Double $K$ -Shell Ionization Produced from 24.0- to 48.0-MeV Oxygen Bombardment

Atoms, Nuclei, and Particles in Matter

Population of Excited Electronic Levels by Beta Decay, and Its Influence on Mössbauer Source Spectra

Plasmas, Fluids, Thermodynamics, and Related Topics

Trapped-Particle Stabilization of Localized Interchange Modes in Axisymmetric Toroidal Plasmas

Ablation Stability of Laser-Driven Implosions

Self-Modulation and Self-Focusing of Electromagnetic Waves in Plasmas

Solids

Quasiparticle Lifetimes and Microwave Response in Nonequilibrium Superconductors

Effects of Dynamic External Pair Breaking in Superconducting Films

Liquid-Gas Phase Diagram of an Electron-Hole Fluid

EPR Observation of Close Frenkel Pairs in Irradiated ZnSe

Nuclei

Study of the Reaction ${}^{56}{Fe} (p, n) {}^{56}{Co}$ to the Antianalog State

Isospin-Forbidden Proton Partial Width in ${}^{41}{Sc}$ and Similar $A = 4 n + 1$ Nuclei

Discovery of the Missing Two-Particle, Two-Hole $0^{+}$ States in ${}^{40}{Ca}$

Elementary Particles and Fields

Measurement of the Polarization Parameter for the Reaction $π^{-} p \to π^{0} n$ between 1.03 and 1.79 GeV/c