Volume 33, Issue 8

19 August 1974

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LETTERS

Atoms, Molecules, and Related Topics

( $e, 2 e$ ) Reaction as a Probe for Details of the Helium Wave Function

I. E. McCarthy, A. Ugbabe, E. Weigold, and P. J. O. Teubner

Phys. Rev. Lett. 33, 459 (1974) - Published 19 August, 1974

Determination of the Avogadro Constant

R. D. Deslattes, A. Henins, H. A. Bowman, R. M. Schoonover, C. L. Carroll, I. L. Barnes, L. A. Machlan, L. J. Moore, and W. R. Shields

Phys. Rev. Lett. 33, 463 (1974) - Published 19 August, 1974

Atoms, Nuclei, and Particles in Matter

Linear Polarizability Contribution to the Nonadditive Three-Molecule Potential

E. Bergmann

Phys. Rev. Lett. 33, 467 (1974) - Published 19 August, 1974

Theory of Induced Molecular-Orbital $K$ X Rays in Heavy-Ion Collisions

Berndt Müller and Walter Greiner

Phys. Rev. Lett. 33, 469 (1974) - Published 19 August, 1974

Evidence for Quasimolecular $K$ X-Ray Emission in Heavy-Ion Collisions from the Observation of the X-Ray Directional Anisotropy

J. S. Greenberg, C. K. Davis, and P. Vincent

Phys. Rev. Lett. 33, 473 (1974) - Published 19 August, 1974

Anisotropic Emission of Noncharacteristic X Rays from Low-Energy I-Au Collisions

G. Kraft, P. H. Mokler, and H. J. Stein

Phys. Rev. Lett. 33, 476 (1974) - Published 19 August, 1974

Plasmas, Fluids, Thermodynamics, and Related Topics

Determination of the $s$ -Electron Contact-Density Ratio for the Fe Configurations $3 d^{6} 4 s^{2}$ and $3 d^{6} 4 s$ from Matrix-Isolation Mössbauer Spectroscopy

H. Micklitz and F. J. Litterst

Phys. Rev. Lett. 33, 480 (1974) - Published 19 August, 1974

Solids

Light Scattering by ${}^{3}{He}$ - ${}^{4}{He}$ Mixtures near the Tricritical Point

P. Leiderer, D. R. Watts, and W. W. Webb

Phys. Rev. Lett. 33, 483 (1974) - Published 19 August, 1974

Existence of Two Types of Insulating States in the Hubbard Model

Tadashi Arai

Phys. Rev. Lett. 33, 486 (1974) - Published 19 August, 1974

Observation of Recombination-Enhanced Defect Reactions in Semiconductors

D. V. Lang and L. C. Kimerling

Phys. Rev. Lett. 33, 489 (1974) - Published 19 August, 1974

Brillouin-Scattering Evidence for a New Phase Transition in Perovskite Crystals: PrAl $O_{3}$

P. A. Fleury, P. D. Lazay, and L. G. Van Uitert

Phys. Rev. Lett. 33, 492 (1974) - Published 19 August, 1974

New Transport Phenomenon in a Semiconductor "Superlattice"

L. Esaki and L. L. Chang

Phys. Rev. Lett. 33, 495 (1974) - Published 19 August, 1974

Nuclei

Polarization in Heavy-Ion Inelastic Scattering in the Coulomb-Nuclear Interference Region

S. G. Steadman, T. A. Belote, R. Goldstein, L. Grodzins, D. Cline, M. J. A. de Voigt, and F. Videbæk

Phys. Rev. Lett. 33, 499 (1974) - Published 19 August, 1974

Mass-Yield Distributions in the Reaction of ${}^{84}{Kr}$ Ions with ${}^{238}U$

J. V. Kratz, A. E. Norris, and G. T. Seaborg

Phys. Rev. Lett. 33, 502 (1974) - Published 19 August, 1974

Elementary Particles and Fields

Interference between $ρ$ and $ω$ Production in $π^{\pm} N \to π^{+} π^{-} N$ at 3, 4, and 6 GeV/c

S. L. Kramer, D. S. Ayres, R. Diebold, A. F. Greene, A. J. Pawlicki, and A. B. Wicklund

Phys. Rev. Lett. 33, 505 (1974) - Published 19 August, 1974

Influence of Meson Charge Exchange on $\bar{p}$ -Absorption Evidence for Neutron Halos

William J. Gerace, Morton M. Sternheim, and James F. Walker

Phys. Rev. Lett. 33, 508 (1974) - Published 19 August, 1974

Physical Review Letters