Volume 20, Issue 19

6 May 1968

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LETTERS

Enhancement of Neutral-Neutral Ionization Processes by Internal Excitation Energy in the Colliding Particles

Nyle G. Utterback and Bert Van Zyl

Phys. Rev. Lett. 20, 1021 (1968) - Published 6 May, 1968

Electric-Field-Induced Phase Change in Cholesteric Liquid Crystals

J. J. Wysocki, J. Adams, and W. Haas

Phys. Rev. Lett. 20, 1024 (1968) - Published 6 May, 1968

Determination of the Velocity of High-Frequency Sound in Liquid ${He}^{3}$ BY X-Ray Scattering

Nareshchandra P. Shah

Phys. Rev. Lett. 20, 1026 (1968) - Published 6 May, 1968

Existence of a Critical Line in Ferromagnetic to Paramagnetic Transitions

A. Arrott

Phys. Rev. Lett. 20, 1029 (1968) - Published 6 May, 1968

Far-Infrared Absorption Induced by Isotopes in NaCl and LiF

Miles V. Klein and H. F. Macdonald

Phys. Rev. Lett. 20, 1031 (1968) - Published 6 May, 1968

Three-Term Analysis of the Ideal Thermal and Electrical Resistivities of Transition Metals

J. T. Schriempf

Phys. Rev. Lett. 20, 1034 (1968) - Published 6 May, 1968

Intra-Atomic Coulomb Interactions and Local Exchange-Enhancement Effects in Dilute Transition-Metal Alloys

Pascal Lederer and D. L. Mills

Phys. Rev. Lett. 20, 1036 (1968) - Published 6 May, 1968

Theory of the Low-Temperature Properties of Nearly Ferromagnetic Dilute Alloys

S. Engelsberg, W. F. Brinkman, and S. Doniach

Phys. Rev. Lett. 20, 1040 (1968) - Published 6 May, 1968

Optical Absorption Edge of Magnetic Semiconductors

Earl Callen

Phys. Rev. Lett. 20, 1045 (1968) - Published 6 May, 1968

Albedo Neutron Source for High-Energy Protons Trapped in the Geomagnetic Field

Devrie S. Intriligator

Phys. Rev. Lett. 20, 1048 (1968) - Published 6 May, 1968

Direct Production of Electron-Positron Pairs by 16.2-BeV/c Negative Pions

Robert L. Kinzer and James R. Burwell

Phys. Rev. Lett. 20, 1050 (1968) - Published 6 May, 1968

Flux of Cosmic-Ray Electrons Between 17 and 63 MeV

Martin H. Israel and Rochus E. Vogt

Phys. Rev. Lett. 20, 1053 (1968) - Published 6 May, 1968

Photoproduction of $ϕ$ Mesons from Carbon at 1800 MeV

P. Mostek, E. Eisenhandler, G. McClellan, N. Mistry, H. Ogren, A. Silverman, J. Swartz, and R. Talman

Phys. Rev. Lett. 20, 1057 (1968) - Published 6 May, 1968

Study of the Structure in the Antiproton-Proton Total Cross Section Near 1.3 GeV/c

W. A. Cooper, L. G. Hyman, W. Manner, B. Musgrave, and L. Voyvodic

Phys. Rev. Lett. 20, 1059 (1968) - Published 6 May, 1968

Semiclassical Method and Zero-Point Oscillations

I. R. Senitzky

Phys. Rev. Lett. 20, 1062 (1968) - Published 6 May, 1968

Factorization, $ω$ Crossover, Polarization, and Finite-Energy Sum Rules for Kaon-Nucleon Scattering

Guru Vachan Dass and C. Michael

Phys. Rev. Lett. 20, 1066 (1968) - Published 6 May, 1968

Differential Cross Sections for Neutral-Pion Electroproduction Near the First Pion-Nucleon Resonance

C. Mistretta, D. Imrie, J. A. Appel, R. Budnitz, L. Carroll, J. Chen, J. Dunning, Jr., M. Goitein, K. Hanson, A. Litke, and R. Wilson

Phys. Rev. Lett. 20, 1070 (1968) - Published 6 May, 1968

Phenomenological Analysis of Neutral Pion Electroproduction and the $γ N N^{*}$ Form Factor

D. Imrie, C. Mistretta, and Richard Wilson

Phys. Rev. Lett. 20, 1074 (1968) - Published 6 May, 1968

Dolen-Horn-Schmid Duality and the Deck Effect

G. F. Chew and A. Pignotti

Phys. Rev. Lett. 20, 1078 (1968) - Published 6 May, 1968

${K_{L}}^{0} \to μ^{+} μ^{-}$ Decay, ${K_{L}}^{0} - {K_{S}}^{0}$ Mass Difference, and Weak-Interaction Cutoff

R. N. Mohapatra, J. Subba Rao, and R. E. Marshak

Phys. Rev. Lett. 20, 1081 (1968) - Published 6 May, 1968

ERRATA

Field Theory, Partial Conservation of Axial-Vector Current, and Kawara-Bayashi-Suzuki-Riazuddin-Fayyazuddin Sum Rule

T. W. Chen and R. E. Pugh

Phys. Rev. Lett. 20, 1084 (1968) - Published 6 May, 1968

Observation of Interband Transitions in Arsenic

Martin Maltz and M. S. Dresselhaus