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E07-006: SRC in 4 He

E07-006: SRC in 4 He. June 2010 Navaphon (Tai) Muangma Massachusetts Institute of Technology Thomas Jefferson Laboratory. Topics. SRC Physics 12 C SRC vs. 4 He SRC experiment Current Status. SRC Physics. Customized ( e,e’pN ) Measurement.

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E07-006: SRC in 4 He

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  1. E07-006: SRC in 4He June 2010 Navaphon (Tai) Muangma Massachusetts Institute of Technology Thomas Jefferson Laboratory

  2. Topics • SRC Physics • 12C SRC vs. 4He SRC experiment • Current Status

  3. SRC Physics Customized (e,e’pN) Measurement To study nucleon pairs at close proximity and their contributions to the large momentum tail of nucleons in nuclei. A pair with “large” relative momentum between the nucleons and small center of mass momentum • high Q2 to minimize MEC • x>1 to suppress isobar contributions • Anti-parallel kinematics to suppress FSI

  4. SRC Physics From the (e,e’), (e,e’p), and (e,e’pN) Results • 80 +/- 5% single particles moving in an average potential • 60 – 70% independent single particle in a shell model potential • 10 – 20% shell model long range correlations • 20 +/- 5% two-nucleon short-range correlations • 18% np pairs • 1% np pairs • 1% nn pairs (from isospin symmetry) • Less than 1% multi-nucleon correlations R. Subedi et al., Science 320, 1476 (2008), published online 29 May 2008 (0.1126/science.1156675).

  5. SRC Physics 4He prediction pp/pn pairs

  6. SRC Physics

  7. SRC Experiments

  8. Current Status General • Software/Analysis • Interactive GUI prepared, Online Analysis is ongoing. • Run Plan • Calibration planned, production plan not yet finalize. • Installation • December 2010 [tentative]. • Experiment Running • February 2011 [tentative].

  9. Current Status BigBite & Neutron Detector

  10. Current Status BigBite Testing with Cosmic Ray [Testlab : Jan-May 2010] • Efficiency testing for MWDC • 98-99% individual plane with HV -1700 V • Noise reduction • Cable and LT replacement, grounding issue. • Electronic • Power supply change, Roc 5 modification, Roc 9 replacement • A/D cards and LT are now with A’ group • Future • More tests when get A/D cards and LT back in July

  11. Current Status HAND New Frame Design and Build [Testlab : Jan-May 2010] • New Frame • Designed– Ordered – Received • New two layers • Scintillator bars tested, ready to build. • Future • Testing with Cosmic ray [Summer 2010]

  12. Current Status HAND Previous Version Upgraded Version

  13. Current Status HRS & Target • Standard HRS package • Left HRS: electron package [electron] • Right HRS: S1, S2 and VDC [proton] • 4He, LD2 , LH2 • Standard Cryogenic targets • 12C foils , Al Dummy

  14. Man Power • Postdoc • Ran Shneor (Tel Aviv) • Vincent Sulkosky (MIT) • Aidan Kelleher (MIT) • Graduate Students: • Or Chen (Tel Aviv) • Igor Korover (Tel Aviv) • Larry Selvy (Kent State) • Navaphon (Tai) Muangma (MIT)

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