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Consists of two protons and one neutron. Calculable 3-body nuclear system.

The (+/-,+/-) signs represent the beam helicities and the projections of the target spin along the quantization axis ( x for A x and z for A z ). BigBite Spectrometer. Consists of a single dipole magnet followed by a detector system. Large solid angle and large momentum acceptance.

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Consists of two protons and one neutron. Calculable 3-body nuclear system.

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  1. The (+/-,+/-) signs represent the beam helicities and the projections of the target spin along the quantization axis (x for Ax and z for Az). BigBite Spectrometer • Consists of a single dipole magnet followed by a detector system. • Large solid angle and large momentum acceptance. • Allow for excellent discrimination between deuterons and protons after incorporating 2-wire chamber assembly. Trigger Plane • Consists of 24 scintillator bars. • ΔE: 500x86x3mm3 E: 500x86x30mm3. • Further particle identification. Original SRC Frame New Frame  Experiment Equipment What to Measure? Why Polarized 3He? • Consists of two protons and one neutron. • Calculable 3-body nuclear system. • Faddeev calculations predict three components dominate the 3He ground-state wave-function. A naïve estimate of the sensitivity of Axand Az on the “amount” of S’component in the 3He wave function. Our expected statistical uncertainties are also shown. S 90% of averaged wave function, “ neutron target”. S’ 1.5% mixed symmetry. D 8.5% generated by tensor force of N-N force. Bonus: Parasitic Measurement of GEn 3D density distribution of dp cluster in 3He. • Impact: all experiments using polarized 3He as an effective polarized neutron target. • Systematic limited measurements. • The expected statistical uncertainty of the parasitic measurement of GEn is shown with conservative estimate 0.0039. Neutron electromagnetic form factors. Polarized nucleon spin structure.

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