The frozen spin polarized proton target at TRIUMF for intermediate energy neutron scattering

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Abstract

A polarized proton target with a volume of 55 cm3 was constructed at TRIUMF to study neutron induced reactions. The polarizable protons were contained in the molecules of 1-butanol that was frozen in the form of beads and placed in the mixing chamber of a vertical dilution refrigerator. The target system was operated about 2000 h for a high precision neutron scattering experiment to test charge symmetry breaking. The highest polarization achieved was −0.97. The relaxation time was typically 150 h in a magnetic field of 0.257 T and at a temperature of 60 mK.

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