Large electron polarization of H-like20Ne-ions traversing gd foils at very high velocities

Autor: Speidel, K. -H., Cub, J., Reuter, U., Passek, F., Wollersheim, H. -J., Martin, N., Egelhof, P., Emling, H., Henning, W., Simon, R. S., Schmidt, R., Simonis, H. -J., Gollwitzer, N.
Zdroj: Zeitschrift für Physik A Hadrons and Nuclei; June 1991, Vol. 339 Issue: 2 p265-268, 4p
Abstrakt: It is shown that transient magnetic fields in Gd-host for20Ne ions at a mean velocity of 12.5v0(v0=c/137), considerably beyond the Bohr velocity of 1s electrons of Ne ions (v1s=10v0), are dominated by the Fermi contact field of these electrons. The first excited 2+-state of2Ne was used as probe. The derived value for the mean degree of polarization p1s=0.32(13), is surprisingly large, though still consistent with values obtained at lower velocities. Present calculations of spin exchange cross sections severely underestimate the observed polarization at this high velocity.
Databáze: Supplemental Index
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