Volume 56, Issue 25

23 June 1986

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LETTERS

Elementary Particles and Fields

Comparison of an Exact Fermion Monte Carlo Algorithm with the Pseudofermion Method Using Staggered Fermions

R. V. Gavai and A. Gocksch

Phys. Rev. Lett. 56, 2659 (1986) - Published 23 June, 1986

String Propagation in a Tachyon Background

Sumit R. Das and B. Sathiapalan

Phys. Rev. Lett. 56, 2664 (1986) - Published 23 June, 1986

Limitations of Heterotic-Superstring Phenomenology

Harry W. Braden, Paul H. Frampton, Thomas W. Kephart, and Abhijit K. Kshirsagar

Phys. Rev. Lett. 56, 2668 (1986) - Published 23 June, 1986

Search for Light Short-Lived Particles in Radiative Upsilon Decays

G. Mageras, P. Franzini, P. M. Tuts, S. Youssef, T. Zhao, J. Lee-Franzini, and R. D. Schamberger

Phys. Rev. Lett. 56, 2672 (1986) - Published 23 June, 1986

Upper Limits for the Production of Light Short-Lived Neutral Particles in Radiative $ϒ$ decay

T. Bowcock et al.

Phys. Rev. Lett. 56, 2676 (1986) - Published 23 June, 1986

Nuclei

Coexistence of Prolate and Oblate Structures up to Spin $40 ℏ$ in ${}^{152}{Dy}$

B. M. Nyakó, J. Simpson, P. J. Twin, D. Howe, P. D. Forsyth, and J. F. Sharpey-Schafer

Phys. Rev. Lett. 56, 2680 (1986) - Published 23 June, 1986

Fundamental Phenomenology and Applications

Linear and Nonlinear Theory of Cherenkov Maser Operation in the Intense Relativistic Beam Regime

Don S. Lemons and Lester E. Thode

Phys. Rev. Lett. 56, 2684 (1986) - Published 23 June, 1986

Fluids, Plasmas, and Electric Discharges

Nonlinear Reflection and Refraction of Planar Ion-Acoustic Plasma Solitons

T. Nagasawa and Y. Nishida

Phys. Rev. Lett. 56, 2688 (1986) - Published 23 June, 1986

Condensed Matter: Structure, Etc.

Thermodynamic Criteria for Grain-Boundary Melting: A Molecular-Dynamics Study

J. Q. Broughton and G. H. Gilmer

Phys. Rev. Lett. 56, 2692 (1986) - Published 23 June, 1986

Vibrational Anomalies Are Not Generally Due to Fractal Geometry: Comments on Proteins

J. A. Krumhansl

Phys. Rev. Lett. 56, 2696 (1986) - Published 23 June, 1986

Observation of a Magnetic Antiphase Domain Structure with Long-Range Order in a Synthetic Gd-Y Superlattice

C. F. Majkrzak, J. W. Cable, J. Kwo, M. Hong, D. B. McWhan, Y. Yafet, J. V. Waszczak, and C. Vettier

Phys. Rev. Lett. 56, 2700 (1986) - Published 23 June, 1986

Observation of Two Length Scales for the Critical Fluctuations of RbCa $F_{3}$

T. W. Ryan, R. J. Nelmes, R. A. Cowley, and A. Gibaud

Phys. Rev. Lett. 56, 2704 (1986) - Published 23 June, 1986

Rate-Theory Model of Polymer Crystallization

D. M. Sadler and G. H. Gilmer

Phys. Rev. Lett. 56, 2708 (1986) - Published 23 June, 1986

Asymmetric Melting and Freezing Kinetics in Silicon

Jeff Y. Tsao, Michael J. Aziz, Michael O. Thompson, and Paul S. Peercy

Phys. Rev. Lett. 56, 2712 (1986) - Published 23 June, 1986

Condensed Matter: Electronic Properties, Etc.

Cooperative Ring Exchange and the Fractional Quantized Hall Effect in an Incompressible Fluid

G. Baskaran

Phys. Rev. Lett. 56, 2716 (1986) - Published 23 June, 1986

New Method to Calculate the Muon Polarization Function

M. Celio

Phys. Rev. Lett. 56, 2720 (1986) - Published 23 June, 1986

Electron Mass Tunneling along the Growth Direction of (Al,Ga) As/GaAs Semiconductor Superlattices

T. Duffield, R. Bhat, M. Koza, F. DeRosa, D. M. Hwang, P. Grabbe, and S. J. Allen, Jr.

Phys. Rev. Lett. 56, 2724 (1986) - Published 23 June, 1986

Spin Anisotropy of Ferromagnetic Films

J. G. Gay and Roy Richter

Phys. Rev. Lett. 56, 2728 (1986) - Published 23 June, 1986

Enhanced Superconductivity in Quasi Two-Dimensional Systems

J. E. Hirsch and D. J. Scalapino

Phys. Rev. Lett. 56, 2732 (1986) - Published 23 June, 1986

Negative Absolute Mobility of Minority Electrons in GaAs Quantum Wells

Ralph A. Höpfel, Jagdeep Shah, Peter A. Wolff, and Arthur C. Gossard

Phys. Rev. Lett. 56, 2736 (1986) - Published 23 June, 1986

Electronic States on a Penrose Lattice

Mahito Kohmoto and Bill Sutherland

Phys. Rev. Lett. 56, 2740 (1986) - Published 23 June, 1986

Towards a Self-Consistent Determination of the Mixing Parameters in the Anderson Model: An Application to the $4 f$ -Excitation Spectra of YbP

R. Monnier, L. Degiorgi, and D. D. Koelling

Phys. Rev. Lett. 56, 2744 (1986) - Published 23 June, 1986

"Dressed Excitons" in a Multiple-Quantum-Well Structure: Evidence for an Optical Stark Effect with Femtosecond Response Time

A. Mysyrowicz, D. Hulin, A. Antonetti, A. Migus, W. T. Masselink, and H. Morkoç

Phys. Rev. Lett. 56, 2748 (1986) - Published 23 June, 1986

Nonreciprocal Optical Reflection of the Uniaxial Antiferromagnet Mn $F_{2}$

L. Remer, B. Lüthi, H. Sauer, R. Geick, and R. E. Camley

Phys. Rev. Lett. 56, 2752 (1986) - Published 23 June, 1986

Band Lineups at II-VI Heterojunctions: Failure of the Common-Anion Rule

J. Tersoff

Phys. Rev. Lett. 56, 2755 (1986) - Published 23 June, 1986

Work Function of Transition-Metal Surface with Submonolayer Alkali-Metal Coverage

Wang Ning, Chen Kailai, and Wang Dingsheng

Phys. Rev. Lett. 56, 2759 (1986) - Published 23 June, 1986

Realization of a Witten Critical Theory in ${(C H_{3})}_{4}$ NMn ${Cl}_{3}$

Ian Affleck

Phys. Rev. Lett. 56, 2763 (1986) - Published 23 June, 1986

COMMENTS

Energy-Level Statistics of Integrable Quantum Systems

T. H. Seligman and J. J. M. Verbaarschot

Phys. Rev. Lett. 56, 2767 (1986) - Published 23 June, 1986

Casati, Chirikov, and Guarneri Respond

G. Casati, B. V. Chirikov, and I. Guarneri

Phys. Rev. Lett. 56, 2768 (1986) - Published 23 June, 1986

Comment on "Fractal Structure of Ti $H_{2}$ Aggregates in a CuTi Matrix"

M. Kolb

Phys. Rev. Lett. 56, 2769 (1986) - Published 23 June, 1986

Dependence of Superconducting Transition Temperature on Pressure in Primitive Hexagonal Si

David Erskine and Peter Y. Yu

Phys. Rev. Lett. 56, 2770 (1986) - Published 23 June, 1986