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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Instrumentation
HK 49.5: Vortrag
Dienstag, 5. März 2013, 17:45–18:00, WIL-C207
Measurement of Nuclear Polarization in H2 and D2 Molecules after Recombination of polarized H or D Atoms — •Robert Gorski — Institut für Kernphysik, FZ Jülich, Germany
The increased interest in spin-dependent observables requires the production of polarized internal gas targets (PIT) and ion beams like at ANKE/COSY. The ABS beam intensity seems to saturate and limits, therefore, the target-gas density. By cooling down the storage cell, the polarized atoms become slower and this results in an increase of the target-gas density. But temperatures below ∼100 Kelvin are not possible due to large polarization losses. One option to cross the limit is the use of polarized molecular hydrogen or deuterium which results from the recombination of polarized atoms before, because the polarization of the gas molecules should not depend much on the temperature. It is known that polarized hydrogen atoms, recombining on a copper surface, maintain up to one half of their nuclear polarization in sufficiently strong magnetic fields. It is the aim of the present project to study the nuclear polarization of recombined hydrogen and deuterium molecules by variation of the boundary conditions like temperature, magnetic field and surface material. It might be possible to increase the figure of merit of double polarized experiments by increasing the target density without too large polarization losses. This experience may help to produce gas of polarized molecular deuterium for future nuclear fusion experiments with polarized fuel.