Volume 42, Issue 23

4 June 1979

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LETTERS

General Physics

Ground-State Symmetry in $XY$ Model of Magnetism

Daniel C. Mattis

Phys. Rev. Lett. 42, 1503 (1979) - Published 4 June, 1979

Critical Correlation Function and Exponent $η$ : A Sum Rule

Richard A. Ferrell and Jayanta K. Bhattacharjee

Phys. Rev. Lett. 42, 1505 (1979) - Published 4 June, 1979

Elementary Particles and Fields

$n - n$ Scattering Length from the Photon Spectra of the Reactions $π^{-} d \to γ nn$ and $π^{-} p \to γ n$

B. Gabioud, J. -C. Alder, C. Joseph, J. -F. Loude, N. Morel, A. Perrenoud, J. -P. Perroud, M. T. Tran, E. Winkelmann, W. Dahme, H. Panke, D. Renker, Č. Zupančič, G. Strassner, and P. Truöl

Phys. Rev. Lett. 42, 1508 (1979) - Published 4 June, 1979

Search for Axion Production in Low-Energy Electron Bremsstrahlung

D. J. Bechis, T. W. Dombeck, R. W. Ellsworth, E. V. Sager, P. H. Steinberg, L. J. Tieg, J. K. Yoh, and R. L. Weitz

Phys. Rev. Lett. 42, 1511 (1979) - Published 4 June, 1979

Nuclei

Atomic Electron Correlation in the $M$ Capture of ${}^{37}{Ar}$

W. Neumann

Phys. Rev. Lett. 42, 1514 (1979) - Published 4 June, 1979

Alpha-Transfer Reactions with Large Energy Transfers

H. Fröhlich, T. Shimoda, M. Ishihara, K. Nagatani, T. Udagawa, and T. Tamura

Phys. Rev. Lett. 42, 1518 (1979) - Published 4 June, 1979

Proposal for an Intense Polarized Li-Ion Source

L. W. Anderson and George A. Nimmo

Phys. Rev. Lett. 42, 1520 (1979) - Published 4 June, 1979

Tensor Force and Inelastic Electron and Proton Scattering to Unnatural-Parity States of Stretched Configurations

R. A. Lindgren, W. J. Gerace, A. D. Bacher, W. G. Love, and F. Petrovich

Phys. Rev. Lett. 42, 1524 (1979) - Published 4 June, 1979

Atoms and Molecules

Precision Method for Hyperfine-Structure Studies in Low-Abundance Isotopes: The Quadrupole Moment of ${}^{43}{Ca}$

P. Grundevik, M. Gustavsson, I. Lindgren, G. Olsson, L. Robertsson, A. Rosén, and S. Svanberg

Phys. Rev. Lett. 42, 1528 (1979) - Published 4 June, 1979

Classical Phenomenology and Applications

Structure of a Shock-Wave Front in a Liquid

William G. Hoover

Phys. Rev. Lett. 42, 1531 (1979) - Published 4 June, 1979

Fluids, Plasmas, and Electric Discharges

Exact Stability Criteria for Finite-Amplitude Solitons

E. W. Laedke and K. H. Spatschek

Phys. Rev. Lett. 42, 1534 (1979) - Published 4 June, 1979

$H^{-}$ and $D^{-}$ Production in Plasmas

M. Bacal and G. W. Hamilton

Phys. Rev. Lett. 42, 1538 (1979) - Published 4 June, 1979

Condensed Matter: Structure, Etc.

Dislocationlike Structures in a Simulated Liquid

R. M. J. Cotterill

Phys. Rev. Lett. 42, 1541 (1979) - Published 4 June, 1979

Determination of Adsorbate Geometries from Intramolecular Scattering in Deep-Core-Level X-Ray Photoemission: CO on Ni(001)

L. -G. Petersson, S. Kono, N. F. T. Hall, C. S. Fadley, and J. B. Pendry

Phys. Rev. Lett. 42, 1545 (1979) - Published 4 June, 1979

Short-Range Quadrupolar Order on a Dilute Simple-Cubic Lattice

M. A. Klenin

Phys. Rev. Lett. 42, 1549 (1979) - Published 4 June, 1979

Phase Transitions in Potassium-Intercalated Graphite: K $C_{24}$

J. B. Hastings, W. D. Ellenson, and J. E. Fischer

Phys. Rev. Lett. 42, 1552 (1979) - Published 4 June, 1979

Phase Separation and Gelation in Gelatin Gels

Toyoichi Tanaka, Gerald Swislow, and Iwao Ohmine

Phys. Rev. Lett. 42, 1556 (1979) - Published 4 June, 1979

Condensed Matter: Electronic Properties, Etc.

Ultraslow Optical Dephasing of La $F_{3}$ : $\Pr^{3 +}$

R. G. DeVoe, A. Szabo, S. C. Rand, and R. G. Brewer

Phys. Rev. Lett. 42, 1560 (1979) - Published 4 June, 1979

Propagating Energy Modes in the Classical Heisenberg Chain: "Magnons" and "Second Magnons"

J. M. Loveluck and E. Balcar

Phys. Rev. Lett. 42, 1563 (1979) - Published 4 June, 1979

Nearest-Neighbor Backscattering Effects in Angle-Integrated Photoemission Spectroscopy of Core Levels

G. Margaritondo and N. G. Stoffel

Phys. Rev. Lett. 42, 1567 (1979) - Published 4 June, 1979

Photoacoustic Effect in Solids

C. L. Cesar, H. Vargas, J. A. Meyer, and L. C. M. Miranda

Phys. Rev. Lett. 42, 1570 (1979) - Published 4 June, 1979

ERRATA

Parity Dependence of the Heavy-Ion Optical Potential.

D. Dehnhard, V. Shkolnik, and M. A. Franey

Phys. Rev. Lett. 42, 1574 (1979) - Published 4 June, 1979

Physical Review Letters