Volume 72, Issue 12

21 March 1994

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LETTERS

General Physics

Movability of localized excitations in nonlinear discrete systems: A separatrix problem

S. Flach and C. R. Willis

Phys. Rev. Lett. 72, 1777 (1994) - Published 21 March, 1994

Gravitation and Astrophysics

Critical phenomena and self-similarity in the gravitational collapse of radiation fluid

Charles R. Evans and Jason S. Coleman

Phys. Rev. Lett. 72, 1782 (1994) - Published 21 March, 1994

Elementary Particles and Fields

How strong is the evidence for electroweak corrections beyond the running of α?

Alberto Sirlin

Phys. Rev. Lett. 72, 1786 (1994) - Published 21 March, 1994

Origin of difference between u¯ and d¯ partons in the nucleon

Keh-Fei Liu and Shao-Jing Dong

Phys. Rev. Lett. 72, 1790 (1994) - Published 21 March, 1994

Quark compositeness, new physics, and ultrahigh-energy cosmic-ray double-core γ-family events

Z. Cao, L. K. Ding, Q. Q. Zhu, and Y. D. He

Phys. Rev. Lett. 72, 1794 (1994) - Published 21 March, 1994

Nuclear Physics

Decays of odd-odd N-Z=2 nuclei above ${}^{100}{Sn}$ : The observation of proton radioactivity from ${}^{112}{Cs}$

R. D. Page, P. J. Woods, R. A. Cunningham, T. Davinson, N. J. Davis, A. N. James, K. Livingston, P. J. Sellin, and A. C. Shotter

Phys. Rev. Lett. 72, 1798 (1994) - Published 21 March, 1994

Atomic, Molecular, and Optical Physics

Precise measurement of the Lamb shift and fine structure of the 2S-2P transition in triplet helium

D. Shiner, R. Dixson, and P. Zhao

Phys. Rev. Lett. 72, 1802 (1994) - Published 21 March, 1994

Pendular alignment of paramagnetic molecules in uniform magnetic fields

Alkwin Slenczka, Bretislav Friedrich, and Dudley Herschbach

Phys. Rev. Lett. 72, 1806 (1994) - Published 21 March, 1994

Multiphoton induced x-ray emission from Kr clusters on M-shell (∼100 Å) and L-shell (∼6 Å) transitions

A. McPherson, T. S. Luk, B. D. Thompson, A. B. Borisov, O. B. Shiryaev, X. Chen, K. Boyer, and C. K. Rhodes

Phys. Rev. Lett. 72, 1810 (1994) - Published 21 March, 1994

Theoretical investigation of collisions of aligned atoms: Ca(4s4f ${}^{1}$ F)+He

A. P. Hickman, J. J. Portman, S. Krebs, and W. Meyer

Phys. Rev. Lett. 72, 1814 (1994) - Published 21 March, 1994

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Chaotic autoionization of molecular Rydberg states

Francesco Benvenuto, Giulio Casati, and D. L. Shepelyansky

Phys. Rev. Lett. 72, 1818 (1994) - Published 21 March, 1994

Nonlinear reduction of high-dimensional dynamical systems via neural networks

Michael Kirby and Rick Miranda

Phys. Rev. Lett. 72, 1822 (1994) - Published 21 March, 1994

Plasma and Beam Physics

Effect of velocity gradients on x-ray line transfer in laser-produced plasmas

J. S. Wark, A. Djaoui, S. J. Rose, H. He, O. Renner, T. Missalla, and E. Foerster

Phys. Rev. Lett. 72, 1826 (1994) - Published 21 March, 1994

Condensed Matter: Structure, Etc.

Fractal growth during early-stage spinodal decomposition in a hydrogen-bonded polymer blend

Erik K. Hobbie, Barry J. Bauer, and Charles C. Han

Phys. Rev. Lett. 72, 1830 (1994) - Published 21 March, 1994

Lower critical ordering temperature in diblock copolymer melts

Chuck Yeung, Rashmi C. Desai, An-Chang Shi, and Jaan Noolandi

Phys. Rev. Lett. 72, 1834 (1994) - Published 21 March, 1994

Giant field-induced deformation of nematic and isotropic liquid crystal drops

Cheol Soo Park, Noel A. Clark, and Richard D. Noble

Phys. Rev. Lett. 72, 1838 (1994) - Published 21 March, 1994

Minimum-dimension trace maps for substitution sequences

Yshai Avishai, Daniel Berend, and David Glaubman

Phys. Rev. Lett. 72, 1842 (1994) - Published 21 March, 1994

Multiple trapping of hydrogen in antimony-doped silicon

Z. N. Liang, C. Haas, and L. Niesen

Phys. Rev. Lett. 72, 1846 (1994) - Published 21 March, 1994

Theory of spinodal decomposition

S. B. Goryachev

Phys. Rev. Lett. 72, 1850 (1994) - Published 21 March, 1994

Isotopic shift of helium melting pressure: Path integral Monte Carlo study

M. Boninsegni, C. Pierleoni, and D. M. Ceperley

Phys. Rev. Lett. 72, 1854 (1994) - Published 21 March, 1994

Molecular dynamics observations of interdiffusion and Stranski-Krastanov growth in the early film deposition of Au on Ag(110)

Michael I. Haftel, Mervine Rosen, Tameika Franklin, and Matthew Hettermann

Phys. Rev. Lett. 72, 1858 (1994) - Published 21 March, 1994

High atom density in the ‘‘1×1’’ phase and origin of the metastable reconstructions on Si(111)

Y.-N. Yang and E. D. Williams

Phys. Rev. Lett. 72, 1862 (1994) - Published 21 March, 1994

Positron annihilation induced Auger electron spectroscopy studies of submonolayer Au on Cu(100): Direct evidence for positron localization at sites containing Au atoms

K. H. Lee, Gimo Yang, A. R. Koymen, K. O. Jensen, and A. H. Weiss

Phys. Rev. Lett. 72, 1866 (1994) - Published 21 March, 1994

Condensed Matter: Electronic Properties, Etc.

Anisotropic superconductivity in the 2D Hubbard model: Gap function and interaction weight

Chien-Hua Pao and N. E. Bickers

Phys. Rev. Lett. 72, 1870 (1994) - Published 21 March, 1994

Self-consistent $d_{x}^{2}$ - $y^{2}$ pairing in a two-dimensional Hubbard model

P. Monthoux and D. J. Scalapino

Phys. Rev. Lett. 72, 1874 (1994) - Published 21 March, 1994

Hybridization effects and metallicity in small radius carbon nanotubes

X. Blase, Lorin X. Benedict, Eric L. Shirley, and Steven G. Louie

Phys. Rev. Lett. 72, 1878 (1994) - Published 21 March, 1994

Identification of the dominant nitrogen defect in silicon

R. Jones, S. Öberg, F. Berg Rasmussen, and B. Bech Nielsen

Phys. Rev. Lett. 72, 1882 (1994) - Published 21 March, 1994

Effective field theory of electron motion in the presence of random magnetic flux

Shou-Cheng Zhang and Daniel P. Arovas

Phys. Rev. Lett. 72, 1886 (1994) - Published 21 March, 1994

Bethe-ansatz for the Bloch electron in magnetic field

P. B. Wiegmann and A. V. Zabrodin

Phys. Rev. Lett. 72, 1890 (1994) - Published 21 March, 1994

Novel symmetry of a random matrix ensemble: Partially broken spin rotation invariance

Yuli B. Lyanda-Geller and Alexander D. Mirlin

Phys. Rev. Lett. 72, 1894 (1994) - Published 21 March, 1994

Magnetic field effect on an electron tunneling out of a confining plane

Ping Ao

Phys. Rev. Lett. 72, 1898 (1994) - Published 21 March, 1994

Classification of quantum Hall universality classes by $W_{1 + \infty}$ symmetry

Andrea Cappelli, Carlo A. Trugenberger, and Guillermo R. Zemba

Phys. Rev. Lett. 72, 1902 (1994) - Published 21 March, 1994

Measurements of the effective mass and scattering times of composite fermions from magnetotransport analysis

D. R. Leadley, R. J. Nicholas, C. T. Foxon, and J. J. Harris

Phys. Rev. Lett. 72, 1906 (1994) - Published 21 March, 1994

Evidence for mean free path fluctuation induced pinning in ${YBa}_{2}$ ${Cu}_{3}$ $O_{7}$ and ${YBa}_{2}$ ${Cu}_{4}$ $O_{8}$ films

R. Griessen, Wen Hai-hu, A. J. J. van Dalen, B. Dam, J. Rector, H. G. Schnack, S. Libbrecht, E. Osquiguil, and Y. Bruynseraede

Phys. Rev. Lett. 72, 1910 (1994) - Published 21 March, 1994

Bose-glass melting in YBaCuO crystals with correlated disorder

L. Krusin-Elbaum, L. Civale, G. Blatter, A. D. Marwick, F. Holtzberg, and C. Feild

Phys. Rev. Lett. 72, 1914 (1994) - Published 21 March, 1994

Study of an Ising model with competing long- and short-range interactions

U. Löw, V. J. Emery, K. Fabricius, and S. A. Kivelson

Phys. Rev. Lett. 72, 1918 (1994) - Published 21 March, 1994

Conversion of the Ising axis in ${DyCu}_{2}$ under high magnetic field

Y. Hashimoto, K. Kindo, T. Takeuchi, K. Senda, M. Date, and A. Yamagishi

Phys. Rev. Lett. 72, 1922 (1994) - Published 21 March, 1994

Field and surface effects on the ground state of antiferromagnetic systems

L. Trallori, P. Politi, A. Rettori, M. G. Pini, and J. Villain

Phys. Rev. Lett. 72, 1925 (1994) - Published 21 March, 1994

Periodic branched structures in a phase-separated magnetic colloid

Hao Wang, Yun Zhu, C. Boyd, Weili Luo, A. Cebers, and R. E. Rosensweig

Phys. Rev. Lett. 72, 1929 (1994) - Published 21 March, 1994

What does the Korringa ratio measure?

B. Sriram Shastry and Elihu Abrahams

Phys. Rev. Lett. 72, 1933 (1994) - Published 21 March, 1994

Anisotropic optical conductivity of decagonal quasicrystals

D. N. Basov, T. Timusk, F. Barakat, J. Greedan, and B. Grushko

Phys. Rev. Lett. 72, 1937 (1994) - Published 21 March, 1994

COMMENTS

Comment on ‘‘Spanning probability in 2D percolation’’

Amnon Aharony and J-P. Hovi

Phys. Rev. Lett. 72, 1941 (1994) - Published 21 March, 1994

Ziff replies

Robert M. Ziff

Phys. Rev. Lett. 72, 1942 (1994) - Published 21 March, 1994

Comment on ‘‘Quantum spin nematics: Moment-free magnetism’’

H. A. Ceccatto, C. J. Gazza, and A. E. Trumper

Phys. Rev. Lett. 72, 1943 (1994) - Published 21 March, 1994

Coleman and Chandra reply

P. Coleman and P. Chandra

Phys. Rev. Lett. 72, 1944 (1994) - Published 21 March, 1994

ERRATA

Origin of the Stokes Shift: A Geometrical Model of Exciton Spectra in 2D Semiconductors

Fang Yang, M. Wilkinson, E. J. Austin, and K. P. O'Donnell

Phys. Rev. Lett. 72, 1945 (1994) - Published 21 March, 1994

New Critical Point for Two Dimensional $XY$ -Type Models

Anna Jonsson, Petter Minnhagen, and Mats Nylén

Phys. Rev. Lett. 72, 1945 (1994) - Published 21 March, 1994

Enhanced Leading Production of $D^{\pm}$ and $D^{* \pm}$ in 250 GeV $π^{\pm}$ -Nucleon Interactions

G. A. Alves et al. (Fermilab E769 Collaboration)

Phys. Rev. Lett. 72, 1946 (1994) - Published 21 March, 1994