Volume 80, Issue 2

October 1950

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ARTICLES

On the Theory of Slow Neutron Scattering by Solid and Liquid Helium

L. Goldstein and D. W. Sweeney

Phys. Rev. 80, 141 (1950) - Published 15 October, 1950

Capture Cross Sections for Fast Neutrons

R. L. Henkel and H. H. Barschall

Phys. Rev. 80, 145 (1950) - Published 15 October, 1950

Energy and Density Distribution of Cosmic-Ray Neutrons

William O. Davis

Phys. Rev. 80, 150 (1950) - Published 15 October, 1950

The Penetration and Diffusion of ${Co}^{60}$ Gamma-Rays in Water Using Spherical Geometry

Gladys R. White

Phys. Rev. 80, 154 (1950) - Published 15 October, 1950

Altitude and Latitude Dependence of Bursts in a Lead-Shielded Ionization Chamber

Allen J. McMahon, Bruno Rossi, and W. F. Burditt

Phys. Rev. 80, 157 (1950) - Published 15 October, 1950

The Long-Range Protons from the Disintegration of Carbon by Deuterons and a Study of the Competing Reactions

G. C. Phillips

Phys. Rev. 80, 164 (1950) - Published 15 October, 1950

The Production of High Energy Deuterons by Energetic Nucleons Bombarding Nuclei

J. Heidmann

Phys. Rev. 80, 171 (1950) - Published 15 October, 1950

The Meson as a Composite Particle

H. M. Moseley and Nathan Rosen

Phys. Rev. 80, 177 (1950) - Published 15 October, 1950

The Emission of Long-Range Charged Particles in the Slow Neutron Fission of Heavy Nuclei

K. W. Allen and J. T. Dewan

Phys. Rev. 80, 181 (1950) - Published 15 October, 1950

Distribution of Recoil Nucleus in Pair Production by Photons

R. Jost, J. M. Luttinger, and M. Slotnick

Phys. Rev. 80, 189 (1950) - Published 15 October, 1950

The Inelastic Scattering of High Energy Neutrons by Deuterons According to the Impulse Approximation

Geoffrey F. Chew

Phys. Rev. 80, 196 (1950) - Published 15 October, 1950

On Spin-Orbit Interactions and Nucleon-Nucleon Scattering

K. M. Case and A. Pais

Phys. Rev. 80, 203 (1950) - Published 15 October, 1950

The Cross Section for Photo-Disintegration of the Deuteron at Low Energies

G. R. Bishop, C. H. Collie, H. Halban, A. Hedgran, K. Siegbahn, S. du Toit, and R. Wilson

Phys. Rev. 80, 211 (1950) - Published 15 October, 1950

Experiments on the Initiation of Electric Arcs

F. E. Haworth

Phys. Rev. 80, 223 (1950) - Published 15 October, 1950

On the Symmetry of Graphite

Joseph S. Lukesh

Phys. Rev. 80, 226 (1950) - Published 15 October, 1950

The Electrical Conductivity of an Ionized Gas

Robert S. Cohen, Lyman Spitzer, Jr., and Paul McR. Routly

Phys. Rev. 80, 230 (1950) - Published 15 October, 1950

Influence of Plastic Flow on the Electrical and Photographic Properties of the Alkali Halide Crystals

Frederick Seitz

Phys. Rev. 80, 239 (1950) - Published 15 October, 1950

Relations among the Crystal Structure Factors

H. Hauptman and J. Karle

Phys. Rev. 80, 244 (1950) - Published 15 October, 1950

Variation of Amplitude-Dependent Internal Friction in Single Crystals of Copper with Frequency and Temperature

Arthur S. Nowick

Phys. Rev. 80, 249 (1950) - Published 15 October, 1950

High Temperature Plasma Properties from High Current Arc Stream Measurements

W. Finkelnburg and S. M. Segal

Phys. Rev. 80, 258 (1950) - Published 15 October, 1950

On the Scattering Theory of the Dirac Equation

George Parzen

Phys. Rev. 80, 261 (1950) - Published 15 October, 1950

The Evaluation of the Collision Matrix

G. C. Wick

Phys. Rev. 80, 268 (1950) - Published 15 October, 1950

Ferromagnetism at Very High Frequencies. III. Two Mechanisms of Dispersion in a Ferrite

G. T. Rado, R. W. Wright, and W. H. Emerson

Phys. Rev. 80, 273 (1950) - Published 15 October, 1950

Letters to the Editor

The Soft X-Ray Valence Band Spectra and the Heat of Formation of Chemical Compounds and Alloys

K. Das Gupta

Phys. Rev. 80, 281 (1950) - Published 15 October, 1950

The Gamma-Ray Spectrum from the Absorption of $π^{-}$ -Mesons in Deuterium

Lee Aamodt, James Hadley, and Wolfgang Panofsky

Phys. Rev. 80, 282 (1950) - Published 15 October, 1950

On Advanced and Retarded Potentials

Alfred Landé

Phys. Rev. 80, 283 (1950) - Published 15 October, 1950

Collimated and Wide-Angle Meson Groups in a Hard-Shower Star

Maurice M. Shapiro and Herman Yagoda

Phys. Rev. 80, 283 (1950) - Published 15 October, 1950

Some Properties of the 43-Day Isomer of ${Cd}^{115}$

P. S. Gill, C. E. Mandeville, and E. Shapiro

Phys. Rev. 80, 284 (1950) - Published 15 October, 1950

Energy Barrier for Asymmetric Fission in the Static Liquid Drop Model

J. Jungerman

Phys. Rev. 80, 285 (1950) - Published 15 October, 1950

Gamma-Rays from ${Ag}^{110}$

J. M. Cork, W. C. Rutledge, C. E. Branyan, A. E. Stoddard, W. J. Childs, and J. M. LeBlanc

Phys. Rev. 80, 286 (1950) - Published 15 October, 1950

The $V^{51} (p, n) {Cr}^{51}$ Neutron Spectrum

P. H. Stelson, W. M. Preston, and Clark Goodman

Phys. Rev. 80, 287 (1950) - Published 15 October, 1950

The Beta-Spectrum of $P^{32}$

S. D. Warshaw, Joses J. L. Chen, and G. L. Appleton

Phys. Rev. 80, 288 (1950) - Published 15 October, 1950

Nuclear Moment Discrepancies in Gallium and Indium

H. M. Foley

Phys. Rev. 80, 288 (1950) - Published 15 October, 1950

The Disintegration of ${Hf}^{181}$

William W. Pratt

Phys. Rev. 80, 289 (1950) - Published 15 October, 1950

The Structure of Methyl Bromide from Microwave Spectra

James W. Simmons and William O. Swan

Phys. Rev. 80, 289 (1950) - Published 15 October, 1950

Spin Dependence of Neutron Scattering by ${Na}^{23}$

W. Selove

Phys. Rev. 80, 290 (1950) - Published 15 October, 1950

Production of Positive Mesons by Photons on Hydrogen

A. S. Bishop, J. Steinberger, and Leslie J. Cook

Phys. Rev. 80, 291 (1950) - Published 15 October, 1950

On the Gravitational Self-Energy of Light

S. B. Nilsson and K. V. Laurikainen

Phys. Rev. 80, 291 (1950) - Published 15 October, 1950

Spinless Mesons in the Electromagnetic Field

P. T. Matthews

Phys. Rev. 80, 292 (1950) - Published 15 October, 1950

Spinless Mesons and Nucleons in the Electromagnetic Field

P. T. Matthews

Phys. Rev. 80, 292 (1950) - Published 15 October, 1950

The Radioactivity of ${Am}^{242}$

G. D. O'Kelley, G. W. Barton, Jr., W. W. T. Crane, and I. Perlman

Phys. Rev. 80, 293 (1950) - Published 15 October, 1950

On Sommerfeld's Surface Wave

C. J. Bouwkamp

Phys. Rev. 80, 294 (1950) - Published 15 October, 1950

On the Transport of Aluminum Atoms by a Gas

Michel Ter-Pogossian, Fred T. Porter, and C. Sharp Cook

Phys. Rev. 80, 294 (1950) - Published 15 October, 1950

The Structure and Chemical Composition of Mars

Harold C. Urey

Phys. Rev. 80, 295 (1950) - Published 15 October, 1950

Spectroscopic Value of the Magnetic Moment of ${}_{83}{Bi}^{209}$

F. M. Kelly, R. Richmond, and M. F. Crawford

Phys. Rev. 80, 295 (1950) - Published 15 October, 1950

The Relative Neutron Capture Cross Sections of the Isotopes of Krypton and Xenon

J. Macnamara and H. G. Thode

Phys. Rev. 80, 296 (1950) - Published 15 October, 1950

The Mobilities of Molecular and Atomic Rare Gas Ions in the Parent Gases: Helium, Neon, and Argon

John A. Hornbeck

Phys. Rev. 80, 297 (1950) - Published 15 October, 1950

The Electric Field at a Thermionic Cathode as a Function of Space Current

Paul L. Copeland and Delbert N. Eggenberger

Phys. Rev. 80, 298 (1950) - Published 15 October, 1950

A Determination of the Speed of Light by the Resonant Cavity Method

Kees Bol

Phys. Rev. 80, 298 (1950) - Published 15 October, 1950

The Structure of Lead Sulfide Films

J. A. James, C. J. Milner, and B. N. Watts

Phys. Rev. 80, 298 (1950) - Published 15 October, 1950

Neutron Refraction in Ferromagnets

Melvin Lax

Phys. Rev. 80, 299 (1950) - Published 15 October, 1950

Cation Distribution in Copper Zinc Ferrite

Jacob L. Snoek

Phys. Rev. 80, 299 (1950) - Published 15 October, 1950

Crystals and Geiger Counters for Scintillation Counting

C. E. Mandeville and H. O. Albrecht

Phys. Rev. 80, 299 (1950) - Published 15 October, 1950

The Detection of Gamma-Ray-Induced Scintillations from Crystals in a Photo-Sensitive Geiger-Müller Counter

C. E. Mandeville and H. O. Albrecht

Phys. Rev. 80, 300 (1950) - Published 15 October, 1950

A Variational Principle for Time-Dependent Problems

Marcello Cini and Luigi A. Radicati

Phys. Rev. 80, 300 (1950) - Published 15 October, 1950

Mass Assignment of Natural Activity of Samarium

Boyd Weaver

Phys. Rev. 80, 301 (1950) - Published 15 October, 1950

Single Crystal Magnetostriction Constants of an Iron-Cobalt Alloy

J. E. Goldman

Phys. Rev. 80, 301 (1950) - Published 15 October, 1950

Theory of Magnetic Anisotropy in Alnico V

J. E. Goldman and R. Smoluchowski

Phys. Rev. 80, 302 (1950) - Published 15 October, 1950

On the Temperature Variations in Alcohol-Argon Filled G-M Counters

Om Parkash

Phys. Rev. 80, 303 (1950) - Published 15 October, 1950

Multiple Scattering of Fast Electrons in Nuclear Emulsions

Dale R. Corson

Phys. Rev. 80, 303 (1950) - Published 15 October, 1950

Diurnal Variation of Primary Cosmic-Ray Heavy Nuclei

J. J. Lord and Marcel Schein

Phys. Rev. 80, 304 (1950) - Published 15 October, 1950

A Direct Determination of the Magnetic Moment of the Proton in Nuclear Magnetons

F. Bloch and C. D. Jeffries

Phys. Rev. 80, 305 (1950) - Published 15 October, 1950

Calculation of the Absorption and Emission Spectra of the Thallium-Activated Potassium Chloride Phosphor

Ferd E. Williams

Phys. Rev. 80, 306 (1950) - Published 15 October, 1950

Photo-Disintegration of $O^{16}$

Melvin A. Preston

Phys. Rev. 80, 307 (1950) - Published 15 October, 1950

Photoelectric Changes Induced in SrO and BaO by Ultraviolet Irradiation

J. E. Dickey and E. A. Taft

Phys. Rev. 80, 308 (1950) - Published 15 October, 1950