1. Short Range Correlation in 4 He E07 – 006 Update report presented to the Hall A User group meeting the Hall A User group meeting Igor Korover Tel Aviv University December 2010

2. Talk Outline Physic Motivation Big Bite detector status HAND (Hall A Neutron Detector) status Future plans E07-006 E07-006 :Setup – Jan / Feb 2011 Beam – Feb / March / Apr 2011

3. SRC – Physics Two nucleons with large relative momentum and small CM momentum. Short Range Correlation Pair * Large / small momentum is compared to Fermi momentum 2N – SRC

4. Short /intermediate Range Correlations in nuclei Cold-Dense Nuclear Matter (neutron-stars). What SRC in nuclei can tell us about: High – Momentum Component of the Nuclear Wave Function. The Strong Short-Range Force Between Nucleons. tensor force, repulsive core, 3N forces Nucleon structure modification in the medium ? EMC and SRC e e/e/ q 2N – SRC A~10 57

5. e’ p p n Experimental setup: E07-006 Beam 4 He HAND BigBite Lead wall L-HRS R - HRS

6. R. Subedi et al., Science 320, 1476 (2008), E01 – 015 - Short Range Correlations in 12 C. Missing momentum: 300 – 600 MeV/c 20 % of nucleons in 12 C are in SRC Strong n – p dominance Strong sensitivity to the NN tensor force

7. Current Experiment: E07-006 vs E01-015 Missing momentum 400 – 900 MeV/c Tensor to Repulsive Core E01-015E07-006 X b >1, Q 2 = 2 [Gev/c] 2 300 – 600 MeV/c400 – 900 MeV/c Tensor ForceTensor to Repulsive core Target – 12 CTarget – 4 He (Less FSI) BigBite and HANDBigBite with MWDCs Upgraded HAND (new lead wall)

8. SRC experiment is Triple coincidence experiment Low rate How Low? Pmiss [MeV/c] # (e,e’pn) events # (e,e’pp) events # days (beam on target) 5002001105 6251602355 7501502805 8501403205 * Expected triple coincidence rate

9. Neuron Array – HAND Used for recoiled neutron detection Work done in Testlab Design and assembling of the new frame Design and ordering new Lead wall (2 inch Lead & 1 inch Fe) Expanding HAND from 4 to 6 layers (112 scintillators instead of 88) Checking Scintillators with cosmic Gain Curves Measurement Lead Wall 112 scintillators Lead wall

10. Example of Gain Curves for layer 4 ADC Channel Voltage [V]

11. HAND efficiency E01 – 15 vs E07 – 006 E01-015 E07-006 Additional Layers in HAND Lead wall: 1 inch Lead instead of 2 inch Lead & 1 inch Fe Increasing neutron detection efficiency

12. Big Bite – Hadron Package Detection of recoiled protons from SRC pair Non focusing dipole E07 – 006 E01-015 Hadron Package: 2 MWDC Trigger Plane (48 scintillators in 2 layers )

13. MWDC 1.Mapping Mapping each wire to specific TDC channel 2.Noise reduction Cables, A/D cards and LT translators checking. 3.Efficiency 98-99% individual plane with HV -1700 V Trigger Plane 1.Scintillators check 2.Gain curves (done using Sr – 90 source) Work Done in Testlab Testing done with Cosmic Rays

14. MWDC – wires mapping Before mapping procedure After mapping procedure x y

15. Future Plans: Finalize the Run Plan Installation of Mechanical reinforcement Preparation of BigBite, HAND and electronics for movement to Hall ( Dec 2010 – Jan 2011) Integration of DAQ (Jan 2011) Detectors setup and testing in HALL (Jan – Feb 2011) Setup and Commission: Feb 11 th 2011 Production: Starting March 3 rd 2011

16. Postdoc Ran Shneor (Tel Aviv) Vincent Sulkosky (MIT) Aidan Kelleher (MIT) Graduate Students: Or Chen (Tel Aviv) Larry Selvy (Kent State) Navaphon (Tai) Muangma (MIT) Igor Korover (Tel Aviv) Postdocs and Graduate Students:

17. Thank you for your attention!