Measurement of the Elastic Magnetic Form Factor of 3He at High Momentum Transfer

I Nakagawa, Tohoku University
J Shaw, University of Massachusetts - Amherst
S Churchwell, University of Massachusetts - Amherst
X Jiang, University of Massachusetts - Amherst
B Asavapibhop, University of Massachusetts - Amherst
M C. Berisso, University of Massachusetts - Amherst
P E. Bosted, University of Massachusetts - Amherst
K Burchesky, University of Massachusetts - Amherst
R S. Hicks, University of Massachusetts - Amherst
A Hotta, University of Massachusetts - Amherst
R A. Miskimen, University of Massachusetts - Amherst
Gerald Alvin Peterson, University of Massachusetts - Amherst
S E. Rock, University of Massachusetts - Amherst

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DOI:10.1103/PhysRevLett.86.5446 Creative Commons Attribution License 3.0 (cc-BY)

Abstract

New electron scattering measurements have been made that extend data on the 3He elastic magnetic form factor up to Q2 = 42.6fm-2. These new data test theoretical conjectures regarding non-nucleonic effects in the three-body system. The very small cross sections, as low as 10-40cm2/sr, required the use of a high-pressure cryogenic gas target and a detector system with excellent background rejection capability. No existing theoretical calculation satisfactorily accounts for all the available data.