Volume 50, Issue 23

6 June 1983

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LETTERS

Elementary Particles and Fields

Nuclear Physics and the Quark Model: A Study of Six Quarks with Chromodynamics

Kim Maltman and Nathan Isgur

Phys. Rev. Lett. 50, 1827 (1983) - Published 6 June, 1983

Nuclei

Mechanism of the ${}^{7}{Li} (γ, N)$ Reactions

M. R. Sené, I. Anthony, D. Branford, A. G. Flowers, A. C. Shotter, C. H. Zimmerman, J. C. McGeorge, R. O. Owens, and P. J. Thorley

Phys. Rev. Lett. 50, 1831 (1983) - Published 6 June, 1983

Proton Nature of the Second Backbending near $N = 90$

R. Holzmann, J. Kuzminski, M. Loiselet, M. A. Van Hove, and J. Vervier

Phys. Rev. Lett. 50, 1834 (1983) - Published 6 June, 1983

Estimates of the Nuclear Time Delay in Dissipative U + U and U + Cm Collisions Derived from the Shape of Positron and $δ$ -Ray Spectra

H. Backe, P. Senger, W. Bonin, E. Kankeleit, M. Krämer, R. Krieg, V. Metag, N. Trautmann, and J. B. Wilhelmy

Phys. Rev. Lett. 50, 1838 (1983) - Published 6 June, 1983

Atoms and Molecules

Electron Capture into Different ( $n, l$ ) States in Slow Collisions of $C^{6 +}$ , $N^{6 +}$ , $O^{6 +}$ , and ${Ne}^{6 +}$ Projectiles on He and $H_{2}$ Targets

Yu. S. Gordeev, D. Dijkkamp, A. G. Drentje, and F. J. de Heer

Phys. Rev. Lett. 50, 1842 (1983) - Published 6 June, 1983

Laser Optogalvanic Detection of Molecular Ions

R. Walkup, R. W. Dreyfus, and Ph. Avouris

Phys. Rev. Lett. 50, 1846 (1983) - Published 6 June, 1983

Condensed Matter: Structure, Etc.

Hydrogen Vibration on Si(111) 7 × 7: Evidence for a Unique Chemisorption Site

Y. J. Chabal

Phys. Rev. Lett. 50, 1850 (1983) - Published 6 June, 1983

Resonance-Enhanced Atom Scattering from Surface Phonons

D. Evans, V. Celli, G. Benedek, J. P. Toennies, and R. B. Doak

Phys. Rev. Lett. 50, 1854 (1983) - Published 6 June, 1983

X-Ray-Standing-Wave Atom Location in Heteropolar Crystals and the Problem of Extinction

J. R. Patel and J. A. Golovchenko

Phys. Rev. Lett. 50, 1858 (1983) - Published 6 June, 1983

Neutron Kikuchi Effect: A New Method for Measuring Phonon Dispersion Curves

Stephen W. Wilkins

Phys. Rev. Lett. 50, 1862 (1983) - Published 6 June, 1983

Condensed Matter: Electronic Properties, Etc.

Role of Solitons in Nearly Metallic Polyacetylene

A. J. Epstein, H. Rommelmann, R. Bigelow, H. W. Gibson, D. M. Hoffmann, and D. B. Tanner

Phys. Rev. Lett. 50, 1866 (1983) - Published 6 June, 1983

Localization Problem in One Dimension: Mapping and Escape

Mahito Kohmoto, Leo P. Kadanoff, and Chao Tang

Phys. Rev. Lett. 50, 1870 (1983) - Published 6 June, 1983

One-Dimensional Schrödinger Equation with an Almost Periodic Potential

Stellan Ostlund, Rahul Pandit, David Rand, Hans Joachim Schellnhuber, and Eric D. Siggia

Phys. Rev. Lett. 50, 1873 (1983) - Published 6 June, 1983

COMMENTS

Comment on the Role of Spin-Nonconserving Forces in the Critical Dynamics of Fe and Ni

C. Hohenemser, G. S. Collins, R. M. Suter, and L. Chow

Phys. Rev. Lett. 50, 1877 (1983) - Published 6 June, 1983

Mezei Responds

F. Mezei

Phys. Rev. Lett. 50, 1878 (1983) - Published 6 June, 1983

Physical Review Letters