Volume 73, Issue 9

29 August 1994

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LETTERS

General Physics

Integrable Systems with Long-Range Interactions, $W_{\infty}$ Algebra, and Energy Spectrum

Kazuhiro Hikami and Miki Wadati

Phys. Rev. Lett. 73, 1191 (1994) - Published 29 August, 1994

Gravitation and Astrophysics

Towards a Unification of Gravity and Yang-Mills Theory

Subenoy Chakraborty and Peter Peldán

Phys. Rev. Lett. 73, 1195 (1994) - Published 29 August, 1994

Elementary Particles and Fields

A Hierarchy of Superstrings

Fiorenzo Bastianelli, Nobuyoshi Ohta, and Jens Lyng Petersen

Phys. Rev. Lett. 73, 1199 (1994) - Published 29 August, 1994

Nontopological Magnetic Monopoles and New Magnetically Charged Black Holes

Kimyeong Lee and Erick J. Weinberg

Phys. Rev. Lett. 73, 1203 (1994) - Published 29 August, 1994

Ultraviolet-Renormalon Calculus

A. I. Vainshtein and V. I. Zakharov

Phys. Rev. Lett. 73, 1207 (1994) - Published 29 August, 1994

Solvability, Consistency, and the Renormalization Group in Large- $N_{c}$ Models of Hadrons

Nicholas Dorey, James Hughes, and Michael P. Mattis

Phys. Rev. Lett. 73, 1211 (1994) - Published 29 August, 1994

Weak Dipole Moment of $τ$ in $e^{+} e^{-}$ Collisions with Longitudinally Polarized Electrons

B. Ananthanarayan and Saurabh D. Rindani

Phys. Rev. Lett. 73, 1215 (1994) - Published 29 August, 1994

Nuclear Physics

Source Size Determination in Relativistic Nucleus-Nucleus Collisions

J. L. Nagle, B. S. Kumar, M. J. Bennett, G. E. Diebold, J. K. Pope, H. Sorge, and J. P. Sullivan

Phys. Rev. Lett. 73, 1219 (1994) - Published 29 August, 1994

Atomic, Molecular, and Optical Physics

Loss of Spatial Coherence by a Single Spontaneous Emission

T. Pfau, S. Spälter, Ch. Kurtsiefer, C. R. Ekstrom, and J. Mlynek

Phys. Rev. Lett. 73, 1223 (1994) - Published 29 August, 1994

Precision Measurement of Strong Field Double Ionization of Helium

B. Walker, B. Sheehy, L. F. DiMauro, P. Agostini, K. J. Schafer, and K. C. Kulander

Phys. Rev. Lett. 73, 1227 (1994) - Published 29 August, 1994

Optical Second Harmonic Generation for Size Measurement of Small Spherical Clusters

V. M. Akulin, E. Borsella, and A. A. Nesterenko

Phys. Rev. Lett. 73, 1231 (1994) - Published 29 August, 1994

Classical Analysis of Phenomenological Potentials for Metallic Clusters

W. D. Heiss and R. G. Nazmitdinov

Phys. Rev. Lett. 73, 1235 (1994) - Published 29 August, 1994

Light-induced Torque on Moving Atoms

M. Babiker, W. L. Power, and L. Allen

Phys. Rev. Lett. 73, 1239 (1994) - Published 29 August, 1994

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Subfemtosecond Pulses in Mode-Locked $2 π$ Solitons of the Cascade Stimulated Raman Scattering

A. E. Kaplan

Phys. Rev. Lett. 73, 1243 (1994) - Published 29 August, 1994

Plasma and Beam Physics

Analytic Model for Halo Formation in High Current Ion Linacs

Robert L. Gluckstern

Phys. Rev. Lett. 73, 1247 (1994) - Published 29 August, 1994

Structure of Thin Current Layers: Implications for Magnetic Reconnection

J. F. Drake, R. G. Kleva, and M. E. Mandt

Phys. Rev. Lett. 73, 1251 (1994) - Published 29 August, 1994

Condensed Matter: Structure, Etc.

Quasicrystalline Structure of Icosahedral ${Al}_{68}$ ${Pd}_{23}$ ${Mn}_{9}$ Resolved by Scanning Tunneling Microscopy

Thomas M. Schaub, Daniel E. Bürgler, H. J. Güntherodt, and J. B. Suck

Phys. Rev. Lett. 73, 1255 (1994) - Published 29 August, 1994

Interaction of xenon at surface steps

Peter Zeppenfeld, Sebastian Horch, and George Comsa

Phys. Rev. Lett. 73, 1259 (1994) - Published 29 August, 1994

Dynamics of a Ring Polymer in a Gel

Sergei P. Obukhov, Michael Rubinstein, and Thomas Duke

Phys. Rev. Lett. 73, 1263 (1994) - Published 29 August, 1994

Condensed Matter: Electronic Properties, Etc.

Near Resonant Scattering from Nonsymmetric Dimers: Applications to Substituted Polyanilines

F. C. Lavarda, M. C. dos Santos, D. S. Galvão, and B. Laks

Phys. Rev. Lett. 73, 1267 (1994) - Published 29 August, 1994

Direct Observation of the Fermi Surface in ${Ba}_{1 - x} K_{x} Bi O_{3}$

W. D. Mosley, J. W. Dykes, R. N. Shelton, P. A. Sterne, and R. H. Howell

Phys. Rev. Lett. 73, 1271 (1994) - Published 29 August, 1994

Numerical Renormalization Group Study of Pseudo-Fermion and Slave-Boson Spectral Functions in the Single Impurity Anderson Model

T. A. Costi, P. Schmitteckert, J. Kroha, and P. Wölfle

Phys. Rev. Lett. 73, 1275 (1994) - Published 29 August, 1994

Two Hubbard Bands: Weight Transfer in Optical and One-Particle Spectra

Henk Eskes and Andrzej M. Oleś

Phys. Rev. Lett. 73, 1279 (1994) - Published 29 August, 1994

Is the Local Density Approximation Exact for Short Wavelength Fluctuations?

Kieron Burke, John P. Perdew, and David C. Langreth

Phys. Rev. Lett. 73, 1283 (1994) - Published 29 August, 1994

NMR Studies of Spin Excitations in Superconducting ${Bi}_{2} {Sr}_{2} Ca {Cu}_{2} O_{8 + δ}$ Single Crystals

M. Takigawa and D. B. Mitzi

Phys. Rev. Lett. 73, 1287 (1994) - Published 29 August, 1994

Anomalous Transport Properties in Superconducting ${Nd}_{1.85} {Ce}_{0.15} Cu O_{4 \pm δ}$

Wu Jiang, S. N. Mao, X. X. Xi, Xiuguang Jiang, J. L. Peng, T. Venkatesan, C. J. Lobb, and R. L. Greene

Phys. Rev. Lett. 73, 1291 (1994) - Published 29 August, 1994

Loop Algorithms for Monte Carlo Simulations of Quantum Spin Systems

N. Kawashima and J. E. Gubernatis

Phys. Rev. Lett. 73, 1295 (1994) - Published 29 August, 1994

Microwave Conductivity of the Soft Ferromagnet (TDAE)- $C_{60}$

A. Schilder, H. Klos, I. Rystau, W. Schütz, and B. Gotschy

Phys. Rev. Lett. 73, 1299 (1994) - Published 29 August, 1994

COMMENTS

Comment on "Anomaly-Induced Magnetic Screening in (2+1)-Dimensional QED at Finite Density"

C. R. Hagen

Phys. Rev. Lett. 73, 1303 (1994) - Published 29 August, 1994

Forte Replies

Stefano Forte

Phys. Rev. Lett. 73, 1304 (1994) - Published 29 August, 1994

Flux Limits for Supermassive Magnetic Monopoles

P. B. Price

Phys. Rev. Lett. 73, 1305 (1994) - Published 29 August, 1994

Barish, Giacomelli, and Hong Reply for the MACRO Collaboration

B. C. Barish, G. Giacomelli, and J. T. Hong

Phys. Rev. Lett. 73, 1306 (1994) - Published 29 August, 1994

High-resolution x-ray-diffraction spectra of Thue-Morse GaAs-AlAs heterostructures

Miroslav Kolář

Phys. Rev. Lett. 73, 1307 (1994) - Published 29 August, 1994

Axel and Terauchi reply

Françoise Axel and Hikaru Terauchi

Phys. Rev. Lett. 73, 1308 (1994) - Published 29 August, 1994

Comment on "Electronic Specific Heat of $Y {Ba}_{2} {Cu}_{3} O_{6 + x}$ from 1.8 to 300 K"

M. L. Horbach and H. Kajüter

Phys. Rev. Lett. 73, 1309 (1994) - Published 29 August, 1994

Comment on "Electronic Specific Heat of $Y {Ba}_{2} {Cu}_{3} O_{6 + x}$ from 1.8 to 300 K"

R. S. Markiewicz

Phys. Rev. Lett. 73, 1310 (1994) - Published 29 August, 1994