Volume 25, Issue 19

C. Berger, G. McClellan, N. Mistry, H. Ogren, B. Sandler, J. Swartz, P. Walstrom, R. L. Anderson, D. Gustavson, J. Johnson, I. Overman, R. Talman, B. H. Wiik, D. Worcester, and A. Moore

Phys. Rev. Lett. 25, 1366 (1970) - Published 9 November, 1970

Search for Violation of $CP$ Invariance in $τ^{\pm}$ Decay

W. T. Ford, P. A. Piroué, R. S. Remmel, A. J. S. Smith, and P. A. Souder

Phys. Rev. Lett. 25, 1370 (1970) - Published 9 November, 1970

Observation of Coherent Interference Pattern Between $ρ$ and $ω$ Decays

H. Alvensleben, U. Becker, William K. Bertram, M. Chen, K. J. Cohen, R. T. Edwards, T. M. Knasel, R. Marshall, D. J. Quinn, M. Rohde, G. H. Sanders, H. Schubel, and Samuel C. C. Ting

Phys. Rev. Lett. 25, 1373 (1970) - Published 9 November, 1970

Determination of the Photoproduction Phase of $ρ^{0}$ Mesons

H. Alvensleben, U. Becker, M. Chen, K. J. Cohen, R. T. Edwards, T. M. Knasel, R. Marshall, D. J. Quinn, M. Rohde, G. H. Sanders, H. Schubel, and Samuel C. C. Ting

Phys. Rev. Lett. 25, 1377 (1970) - Published 9 November, 1970

Recoil Proton Polarization in Eta Photoproduction

C. A. Heusch, C. Y. Prescott, L. S. Rochester, and B. D. Winstein

Phys. Rev. Lett. 25, 1381 (1970) - Published 9 November, 1970

Upper Limit on the $ω \to 2 π$ Decay Rate From $\bar{p} n$ Annihilations at Rest

R. Bizzarri, G. Ciapetti, U. Dore, M. Gaspero, P. Guidoni, I. Laakso, F. Marzano, G. C. Moneti, L. Gray, P. Hagerty, and T. Kalogeropoulos

Phys. Rev. Lett. 25, 1385 (1970) - Published 9 November, 1970

Complex Regge Poles in the Cut $j$ Plane: Pion-Nucleon Charge-Exchange Scattering

Bipin R. Desai, Peter Kaus, Robert T. Park, and F. Zachariasen

Phys. Rev. Lett. 25, 1389 (1970) - Published 9 November, 1970

Difference in Energy Dependence for ${A_{2}}^{-}$ and ${A_{2}}^{0}$ Production

J. T. Carroll, M. W. Firebaugh, A. Garfinkel, R. Morse, B. Y. Oh, W. Robertson, W. D. Walker, J. A. J. Matthews, J. D. Prentice, T. F. Johnston, and T. S. Yoon

Phys. Rev. Lett. 25, 1393 (1970) - Published 9 November, 1970

ERRATA

$SU (3) \otimes SU (3)$ , Symmetry Breaking, and Cabibbo Angle

J. C. Bane and K. T. Mahanthappa

Phys. Rev. Lett. 25, 1396 (1970) - Published 9 November, 1970

Physical Review Letters

Volume 25, Issue 19

LETTERS

Atoms, Molecules, and Related Topics

Bounds for Oscillator-Strength Sums from Approximate Quadratures

Atomic-Beam Deflection by Resonance-Radiation Pressure

Atoms, Nuclei, and Particles in Matter

Wavelength Dependence of the Fano Effect

Fluids, Thermodynamics, and Related Topics

New Electro-Optic Effect in a Room-Temperature Nematic Liquid Crystal

Self-Diffusion and Molecular Order in Lyotropic Liquid Crystals

Inverse Faraday Effect in a Plasma

Experimental Study of Small-Scale Filaments of Light in Liquids

Solids

Thermal Periodicity of Filament Formation and Elastic Lattice Vibrations

Bragg Reflection Half-Widths in Low-Energy Electron Diffraction

Nuclei

$E 2$ Effective Charges of the $f_{\frac{7}{2}}$ Proton and Neutron Deduced from the Lifetimes of the $6^{+}$ States in ${}^{50}{Ti}$ , ${}^{54}{Fe}$ , and ${}^{42}{Ca}$

Experimental Observation of a Predicted Exchange Resonance in ${}^{3}{He}$ + ${}^{4}{He}$ Elastic Scattering

Depolarization of Negative Muons in Low-Z Muonic Atoms with Nonzero Nuclear Spin

One-Neutron Transfer Reactions ${}^{9}{Be}$ ( ${}^{16}O$ , ${}^{17}O$ [0.871]) ${}^{8}{Be}$ and ${}^{13}C$ ( ${}^{16}O$ , ${}^{17}O$ [0.871]) ${}^{12}C$

Magnetic-Dipole Transitions in the ( $π d_{\frac{3}{2}}$ )( $ν f_{\frac{7}{2}}$ ) Quartet

Elementary Particles and Fields

Impossibility of a Defocusing Quadrupole-Lens System

Precise Measurement of the Neutral Branching Ratios of the $η$ Meson

Branching Ratios of the $K (1420)$ Meson

Polarization of High-Energy Photons Using Highly Oriented Graphite