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HK: Physik der Hadronen und Kerne
HK 14: Poster Session: Instrumentation and Applications
HK 14.29: Poster
Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie
The Nuclear Polarization of Molecules from Recombined Polarized Hydrogen and Deuterium Gas Atoms — •Hellmut Seyfarth1, Ralf Engels2, Peter Kravtsov3, Bernd Lorentz1, Maxim Mikirtytchiants1,3, Hans Paetz gen. Schieck2, Frank Rathmann1, Hans Ströher1, Nikolay Tchernov3, and Alexandre Vassiliev3 — 1Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany — 3High Energy Physics Department, St. Petersburg Nuclear Physics Institute, 188300 Gatchina, Russia
During the past decade, polarized atomic H and D storage-cell gas targets have been successfully applied at storage rings. However, a fraction of the polarized atoms recombines in wall collisions. The nuclear polarization, of the molecules is not directly accessible with a Breit-Rabi polarimeter (as used at HERMES), only the polarization of the atoms extracted from the cell can be measured. In order to overcome the resulting systematic uncertainty in the total overall nuclear polarization of the target gas, the nuclear polarization of recombined H2 molecules was recently studied in a separate experiment [1]. A high value has been found for a strong external magnetic holding field. In the framework of an ISTC project [2], additional investigations of polarized hydrogen and new studies of polarized deuterium molecules are being prepared. These will also include different hyperfine state compositions and variation of the storing conditions like material and dimensions of the cell walls.
[1] T. Wise et al., Phys. Rev. Lett. 87, 042701 (2001).
[2] International Science and Technology Center, project no. 1861.