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

New electron scattering measurements have been made that extend data on the {sup 3}He elastic magnetic form factor up to Q{sup 2}=42.6 fm{sup {minus}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{sup {minus}40} cm{sup 2}/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.