Volume 81, Issue 4

February 1951

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ARTICLES

Stopping Power and Energy Loss for Ion Pair Production for 340-Mev Protons

C. J. Bakker and E. Segrè

Phys. Rev. 81, 489 (1951) - Published 15 February, 1951

90-Mev Neutron-Proton Scattering at Large Proton Angles

Roger Wallace

Phys. Rev. 81, 493 (1951) - Published 15 February, 1951

Reflection of Neutrons from Magnetized Mirrors

D. J. Hughes and M. T. Burgy

Phys. Rev. 81, 498 (1951) - Published 15 February, 1951

The Determination of Atomic Mass Doublets by Means of a Mass Spectrometer

Alfred O. Nier and T. R. Roberts

Phys. Rev. 81, 507 (1951) - Published 15 February, 1951

Polonium Isotopes Produced with High Energy Particles

D. G. Karraker and D. H. Templeton

Phys. Rev. 81, 510 (1951) - Published 15 February, 1951

Neutron Production by Cosmic Rays at Sea Level

A. R. Tobey and C. G. Montgomery

Phys. Rev. 81, 517 (1951) - Published 15 February, 1951

Alpha-Particle Groups from the $N^{14} (d, α) C^{12}$ and $N^{15} (d, α) C^{13}$ Reactions

R. Malm and W. W. Buechner

Phys. Rev. 81, 519 (1951) - Published 15 February, 1951

Gamma-Radiation from ${Pb}^{206}$

D. E. Alburger and G. Friedlander

Phys. Rev. 81, 523 (1951) - Published 15 February, 1951

Coherent Scattering Amplitudes as Determined by Neutron Diffraction

C. G. Shull and E. O. Wollan

Phys. Rev. 81, 527 (1951) - Published 15 February, 1951

Thick Target Fast Neutron Yield from 15-Mev Deuteron and 30-Mev Alpha-Bombardment

A. J. Allen, J. F. Nechaj, K. -H. Sun, and B. Jennings

Phys. Rev. 81, 536 (1951) - Published 15 February, 1951

Radioactive Isotopes of Lutetium and Hafnium

G. Wilkinson and H. G. Hicks

Phys. Rev. 81, 540 (1951) - Published 15 February, 1951

On the Production of Mesons by Primary Cosmic Rays

H. D. Rathgeber

Phys. Rev. 81, 544 (1951) - Published 15 February, 1951

A Search for Primary Cosmic Gamma-Radiation. I

Gilbert J. Perlow and C. W. Kissinger

Phys. Rev. 81, 552 (1951) - Published 15 February, 1951

Barometric and Temperature Coefficients of Frequency of Small Cosmic-Ray Bursts and of Burst-Corrected Cosmic-Ray Ionization

James W. Broxon

Phys. Rev. 81, 555 (1951) - Published 15 February, 1951

The Gamma-Ray Spectrum Resulting from Capture of Negative $π$ -Mesons in Hydrogen and Deuterium

Wolfgang K. H. Panofsky, R. Lee Aamodt, and James Hadley

Phys. Rev. 81, 565 (1951) - Published 15 February, 1951

The Capture of $π$ -Mesons in Deuterium

K. Brueckner, R. Serber, and K. Watson

Phys. Rev. 81, 575 (1951) - Published 15 February, 1951

On the Density Spectrum and Structure of Extensive Air Showers

S. F. Singer

Phys. Rev. 81, 579 (1951) - Published 15 February, 1951

Proton-Proton Scattering at 3.4, 6.8, and 7.5 Mev

James Rouvina

Phys. Rev. 81, 593 (1951) - Published 15 February, 1951

The Relative Probabilities and Absolute Cross Sections of the D — D Reactions

K. G. McNeill and G. M. Keyser

Phys. Rev. 81, 602 (1951) - Published 15 February, 1951

On the Photo-Conductivity of Thallous Sulfide Cells

A. W. Ewald

Phys. Rev. 81, 607 (1951) - Published 15 February, 1951

New Aspects of the Photoelectric Emission from Na and K

Jean Dickey

Phys. Rev. 81, 612 (1951) - Published 15 February, 1951

On the First Passage Time Probability Problem

Arnold J. F. Siegert

Phys. Rev. 81, 617 (1951) - Published 15 February, 1951

Letters to the Editor

The Atomic Masses of $H^{1}$ , $C^{12}$ , and $S^{32}$

Alfred O. Nier

Phys. Rev. 81, 624 (1951) - Published 15 February, 1951

The $H_{2}$ — D Mass Difference and the Determination of Secondary Atomic Mass Standards

T. R. Roberts

Phys. Rev. 81, 624 (1951) - Published 15 February, 1951

Beta-Decay and Meson Decay

Eduardo R. Caianiello

Phys. Rev. 81, 625 (1951) - Published 15 February, 1951

Low Energy Electron Resulting from a Stopped $μ$ -Meson

Gerhart Groetzinger, Lewis B. Leder, and Fred L. Ribe

Phys. Rev. 81, 626 (1951) - Published 15 February, 1951

Production of Highly Polarized Neutron Beams by Bragg Reflection from Ferromagnetic Crystals

C. G. Shull

Phys. Rev. 81, 626 (1951) - Published 15 February, 1951

Thermal Expansion at Low Temperatures

S. Visvanathan

Phys. Rev. 81, 626 (1951) - Published 15 February, 1951

The Directional Distribution of Photo-Electrons Ejected by Polarized Quanta

Frank L. Hereford

Phys. Rev. 81, 627 (1951) - Published 15 February, 1951

On the Production of Polarized High Energy X-Rays

M. May and G. C. Wick

Phys. Rev. 81, 628 (1951) - Published 15 February, 1951

The Integral Multiplicity of Meson Production

Kurt Sitte

Phys. Rev. 81, 628 (1951) - Published 15 February, 1951

Delays of Penetrating Particles in Atmospheric Showers

L. Mezzetti, E. Pancini, and G. Stoppini

Phys. Rev. 81, 629 (1951) - Published 15 February, 1951

Microwave Spectra of Deutero-Ammonias

Harold Lyons, L. J. Rueger, R. G. Nuckolls, and M. Kessler

Phys. Rev. 81, 630 (1951) - Published 15 February, 1951

The Enhanced Photoelectric Emission Effect in Barium Oxide

B. D. McNary

Phys. Rev. 81, 631 (1951) - Published 15 February, 1951

Angular Distributions of Neutrons from ( $α, n$ ) and ( $d, n$ ) Reactions

Bernard L. Cohen

Phys. Rev. 81, 632 (1951) - Published 15 February, 1951

Photo-Luminescence Efficiency of ZnS:Cu Phosphors as a Function of Temperature

Richard H. Bube

Phys. Rev. 81, 633 (1951) - Published 15 February, 1951

High Energy Photo-Protons from Carbon

Darcy Walker

Phys. Rev. 81, 634 (1951) - Published 15 February, 1951

The Nuclear Spin of ${Be}^{9}$

H. S. Gutowsky, R. E. McClure, and C. J. Hoffman

Phys. Rev. 81, 635 (1951) - Published 15 February, 1951

On the Hard Sphere Model of the Nucleon

Robert Jastrow

Phys. Rev. 81, 636 (1951) - Published 15 February, 1951

Growth of Germanium Single Crystals Containing $p - n$ Junctions

G. K. Teal, M. Sparks, and E. Buehler

Phys. Rev. 81, 637 (1951) - Published 15 February, 1951

Theory and Experiment for a Germanium $p - n$ Junction

F. S. Goucher, G. L. Pearson, M. Sparks, G. K. Teal, and W. Shockley

Phys. Rev. 81, 637 (1951) - Published 15 February, 1951

On the Isomerism of ${Kr}^{83}$ and ${Xe}^{133}$

Ingmar Bergström

Phys. Rev. 81, 638 (1951) - Published 15 February, 1951

Window Correction Curves and the Shape of Beta-Spectra

D. Saxon

Phys. Rev. 81, 639 (1951) - Published 15 February, 1951

The Change of Cosmic-Ray Neutron Intensity Following Solar Disturbances

J. A. Simpson, Jr.

Phys. Rev. 81, 639 (1951) - Published 15 February, 1951

The High Energy Beta-Spectrum of ${Sc}^{46}$

Fred T. Porter and C. Sharp Cook

Phys. Rev. 81, 640 (1951) - Published 15 February, 1951

$Q$ -Values for ( $α, p$ ) Reactions on Aluminum and Boron by Means of Photographic Emulsions

Hilding Slätis, Elis Hjalmar, and Rune Carlsson

Phys. Rev. 81, 641 (1951) - Published 15 February, 1951

Low Intensity Radiations in $I^{131}$ Decay

H. Zeldes, A. R. Brosi, and B. H. Ketelle

Phys. Rev. 81, 642 (1951) - Published 15 February, 1951

The High Energy Gamma Radiation† from ${Ta}^{181}$

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

Phys. Rev. 81, 642 (1951) - Published 15 February, 1951

Calculations on the Number of Neutrons in the Atmosphere

S. Lattimore

Phys. Rev. 81, 643 (1951) - Published 15 February, 1951

The Half-Life of $I^{131}$

Jules H. Sreb

Phys. Rev. 81, 643 (1951) - Published 15 February, 1951

ERRATA

Erratum: The Diamagnetic Correction for Protons in Water and Mineral Oil

H. A. Thomas

Phys. Rev. 81, 643 (1951) - Published 15 February, 1951

Erratum: 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. 81, 644 (1951) - Published 15 February, 1951

Letters to the Editor

The Excitation Energy Difference in ${Li}^{7}$ — ${Be}^{7}$

E. Feenberg

Phys. Rev. 81, 644 (1951) - Published 15 February, 1951

Experimental Search for the Beta-Decay of the $π^{+}$ Meson

Helen L. Friedman and James Rainwater

Phys. Rev. 81, 644 (1951) - Published 15 February, 1951

Letter to the Editor

Paramagnetic Resonance at Very Low Fields

Martin A. Garstens

Phys. Rev. 81, 645 (1951) - Published 15 February, 1951

Letters to the Editor

The Qualitative Similarity of Origin of the Main Cosmic Radiation and of Showers

J. Clay

Phys. Rev. 81, 645 (1951) - Published 15 February, 1951

Proceedings of the American Physical Society

Phys. Rev. 81, 646 (1951) - Published 15 February, 1951