Volume 52, Issue 20

14 May 1984

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LETTERS

General Physics

Vacuum Topology and Incoherence in Quantum Gravity

Andrew Strominger

Phys. Rev. Lett. 52, 1733 (1984) - Published 14 May, 1984

Lie Algebras for Potential Scattering

Alejandro Frank and Kurt Bernardo Wolf

Phys. Rev. Lett. 52, 1737 (1984) - Published 14 May, 1984

Supersymmetry Breaking by the Eleven-Dimensional Scalar Field $φ (x, y)$

Y. S. Myung and Y. D. Kim

Phys. Rev. Lett. 52, 1740 (1984) - Published 14 May, 1984

Elementary Particles and Fields

Exotic Structure in the $σ$ Model

Vikram Soni

Phys. Rev. Lett. 52, 1743 (1984) - Published 14 May, 1984

Synchrotron Radiation and Channeling of Ultrarelativistic Particles

J. C. Kimball and N. Cue

Phys. Rev. Lett. 52, 1747 (1984) - Published 14 May, 1984

Monte Carlo Study of SU(4) Gauge Theory at Finite Temperature

A. Gocksch and M. Okawa

Phys. Rev. Lett. 52, 1751 (1984) - Published 14 May, 1984

Role of Conservation Laws in the Callan-Rubakov Processes with Arbitrary Number of Generations of Fermions

Ashoke Sen

Phys. Rev. Lett. 52, 1755 (1984) - Published 14 May, 1984

Nuclei

Absolute Cross Section for Neutron-Proton Radiative Capture at $T_{n} = 185$ MeV

H. O. Meyer, J. R. Hall, M. Hugi, H. J. Karwowski, R. E. Pollock, and P. Schwandt

Phys. Rev. Lett. 52, 1759 (1984) - Published 14 May, 1984

Fission of Uranium Nuclei in Flight at Relativistic Energies

P. L. Jain, M. M. Aggarwal, M. S. El-Nagdy, and A. Z. M. Ismail

Phys. Rev. Lett. 52, 1763 (1984) - Published 14 May, 1984

Atoms and Molecules

Simultaneous Laser- and Ion-Beam Excitation of a Na-Beam Target

D. Schneider, V. Pfeufer, W. Stöffler, R. Bruch, H. G. Berry, L. P. Somerville, J. E. Hardis, P. Arcuni, P. Seidel, and C. F. Moore

Phys. Rev. Lett. 52, 1767 (1984) - Published 14 May, 1984

Semiclassical Approximation for the Nonrelativistic Coulomb Propagator

S. M. Blinder

Phys. Rev. Lett. 52, 1771 (1984) - Published 14 May, 1984

Classical Phenomenology and Applications

Chaotic Phases and Magnetic Order in a Convective Fluid

S. Fauve, C. Laroche, A. Libchaber, and B. Perrin

Phys. Rev. Lett. 52, 1774 (1984) - Published 14 May, 1984

Laser with a Fluctuating Pump: Intensity Correlations of a Dye Laser

R. F. Fox, G. E. James, and R. Roy

Phys. Rev. Lett. 52, 1778 (1984) - Published 14 May, 1984

Fluids, Plasmas, and Electric Discharges

Laboratory Evidence for Ion-Acoustic—Type Double Layers

Chung Chan, M. H. Cho, Noah Hershkowitz, and Tom Intrator

Phys. Rev. Lett. 52, 1782 (1984) - Published 14 May, 1984

Condensed Matter: Structure, Etc.

Vibrational Bethe Lattice with Random Dihedral Angles

R. A. Barrio, F. L. Galeener, and E. Martinez

Phys. Rev. Lett. 52, 1786 (1984) - Published 14 May, 1984

Effects of Helium on Two-Level Systems in Porous Vycor Glass

J. R. Beamish, A. Hikata, and C. Elbaum

Phys. Rev. Lett. 52, 1790 (1984) - Published 14 May, 1984

Rotational Epitaxy of Chemisorbed K Monolayers on Cu(001)

Tetsuya Aruga, Hiroshi Tochihara, and Yoshitada Murata

Phys. Rev. Lett. 52, 1794 (1984) - Published 14 May, 1984

Monte Carlo Calculation for Electromagnetic-Wave Scattering from Random Rough Surfaces

N. Garcia and E. Stoll

Phys. Rev. Lett. 52, 1798 (1984) - Published 14 May, 1984

Continuous Vortices with Broken Symmetry in Rotating Superfluid ${}^{3}{He}$ - $A$

H. K. Seppälä, P. J. Hakonen, M. Krusius, T. Ohmi, M. M. Salomaa, J. T. Simola, and G. E. Volovik

Phys. Rev. Lett. 52, 1802 (1984) - Published 14 May, 1984

Hydrogen Detection during Catalytic Surface Reactions: Evidence for Activated Lateral Hydrogen Mobility in the Water-Forming Reaction on Pd

L. -G. Petersson, H. M. Dannetun, and I. Lundström

Phys. Rev. Lett. 52, 1806 (1984) - Published 14 May, 1984

Observation of Spin Rotation Effects in Polarized ${}^{3}{He}$ - ${}^{4}{He}$ Mixtures

W. J. Gully and W. J. Mullin

Phys. Rev. Lett. 52, 1810 (1984) - Published 14 May, 1984

Microscopic Theory of Atomic Diffusion Mechanisms in Silicon

Roberto Car, Paul J. Kelly, Atsushi Oshiyama, and Sokrates T. Pantelides

Phys. Rev. Lett. 52, 1814 (1984) - Published 14 May, 1984

Topological Symmetry Breakdown in Cholesterics, Nematics, and ${}^{3}{He}$

A. P. Balachandran, F. Lizzi, and V. G. J. Rodgers

Phys. Rev. Lett. 52, 1818 (1984) - Published 14 May, 1984

Raman Scattering in Alloy Semiconductors: "Spatial Correlation" Model

P. Parayanthal and Fred H. Pollak

Phys. Rev. Lett. 52, 1822 (1984) - Published 14 May, 1984

Condensed Matter: Electronic Properties, Etc.

Unoccupied Surface State on Ag(110) as Revealed by Inverse Photoemission

B. Reihl, R. R. Schlittler, and H. Neff

Phys. Rev. Lett. 52, 1826 (1984) - Published 14 May, 1984

Transition-Metal Monoxides: Band or Mott Insulators

K. Terakura, A. R. Williams, T. Oguchi, and J. Kübler

Phys. Rev. Lett. 52, 1830 (1984) - Published 14 May, 1984

Localization of $5 f$ Electrons in Americium: A Photoemission Study

J. R. Naegele, L. Manes, J. C. Spirlet, and W. Müller

Phys. Rev. Lett. 52, 1834 (1984) - Published 14 May, 1984

COMMENTS

Determination of the Effective Axial Coupling Constant

Michael C. Birse and Gerald A. Miller

Phys. Rev. Lett. 52, 1838 (1984) - Published 14 May, 1984

Buck and Perez Respond

B. Buck and S. M. Perez

Phys. Rev. Lett. 52, 1839 (1984) - Published 14 May, 1984

Comment on "Static Charge Fluctuations in Amorphous Silicon"

L. Brey, C. Tejedor, and J. A. Vergés

Phys. Rev. Lett. 52, 1840 (1984) - Published 14 May, 1984

ERRATA

Chaos in a Nonlinear Driven Oscillator with Exact Solution

Diego L. Gonzalez and Oreste Piro

Phys. Rev. Lett. 52, 1841 (1984) - Published 14 May, 1984