Spin-exchange optically pumped polarized {sup 3}He target for low-energy charged particle scattering experiments

We have constructed, tested, and calibrated a polarized {sup 3}He target system which facilitates p-{sup 3}He elastic scattering at proton energies as low as 2 MeV. This system consists of a target cell placed in a uniform B field inside a scattering chamber and an external optical pumping station u...

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Bibliographic Details
Published in:Review of scientific instruments 2005-03, Vol.76 (3)
Main Authors: Katabuchi, T., Buscemi, S., Cesaratto, J.M., Clegg, T.B., Daniels, T.V., Fassler, M., Neufeld, R.B., Kadlecek, S., Triangle Universities Nuclear Laboratory, Amersham Health, 2500 Meridian Parkway, Suite 150, Durham, North Carolina 27713
Format: Article
Language:English
Subjects:
APERTURES
CHARGED PARTICLES
ELASTIC SCATTERING
HELIUM 3 TARGET
MAGNETIC FIELDS
MASS NUMBER
MEV RANGE 01-10
NUCLEAR MAGNETIC RESONANCE
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEAR REACTIONS
OPTICAL PUMPING
POLARIMETRY
POLARIZATION-ASYMMETRY RATIO
POLARIZED TARGETS
PROTON-NUCLEON INTERACTIONS
PYREX
SPHERICAL CONFIGURATION
SPIN EXCHANGE
SPIN-LATTICE RELAXATION
VALVES
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Summary:We have constructed, tested, and calibrated a polarized {sup 3}He target system which facilitates p-{sup 3}He elastic scattering at proton energies as low as 2 MeV. This system consists of a target cell placed in a uniform B field inside a scattering chamber and an external optical pumping station utilizing Rb spin exchange. Computer-controlled valves allow polarized {sup 3}He gas to be transferred quickly between the optical pumping station and the spherical Pyrex target cell, which has Kapton film covering apertures for the passing beam and the scattering particles. The magnetic field required to maintain {sup 3}He polarization in the target cell is created with a compact, shielded sine-theta coil. Target gas polarimetry is accomplished using nuclear magnetic resonance and calibrated using the known analyzing power of {alpha}-{sup 3}He scattering.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1866235