Irradiated NH/sub 3/ and ND/sub 3/ - two new target materials for polarized targets

Conference · Sat Jan 01 04:00:00 EST 1983 · AIP Conf. Proc.; (United States)

OSTI ID:6116437

Meyer, W

A study of dynamic nuclear polarization (DNP) in NH/sub 3/ and ND/sub 3/ was made at the Bonn 2.5 GeV electron synchrotron. The paramagnetic radicals in the polycrystalline ammonia beads were created by irradiation in the high intensity 20 MeV electron beam (> 10/sup 14/ electrons/sec) of the injection linac. During irradiation the ammonia beads, produced by dropping into liquid nitrogen, were cooled in liquid argon at approx. 90K. DNP measurements were performed at 1K, 0.5K, and 0.2K in a 2.5T magnetic field. Samples of NH/sub 3/, prepared in this way, yielded a maximum proton polarization of 66% at a temperature 0f 0.5K with a short polarization build-up time of 9 minutes. ND/sub 3/ could be polarized at a temperature of 0.2K up to 31%. The radiation resistance of the polarization of NH/sub 3/ is better than that of butanol. 23 references, 4 figures, 2 tables.

• Research Organization: Universitaet Bonn, West Germany
• OSTI ID: 6116437
• Report Number(s): CONF-820941-
• Conference Information: Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 95
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
AMMONIA
ANGULAR MOMENTUM
BEAMS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DEUTERIUM COMPOUNDS
ELECTRON BEAMS
ENERGY RANGE
HIGH ENERGY PHYSICS
HYDRIDES
HYDROGEN COMPOUNDS
LEPTON BEAMS
MAGNETIC MOMENTS
MAGNETIC RESONANCE
MEETINGS
MEV RANGE
MEV RANGE 10-100
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUCLEAR MAGNETIC RESONANCE
ORIENTATION
PARTICLE BEAMS
PARTICLE PROPERTIES
PHYSICS
POLARIZED TARGETS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
RESONANCE
SPIN
SPIN ORIENTATION
TARGETS
ULTRALOW TEMPERATURE