Post on 01-Jan-2016
Short Range Correlation in Short Range Correlation in 44HeHe
E07 – 006
Update report presented toUpdate report presented to the Hall A User group meetingthe Hall A User group meeting
Igor KoroverTel Aviv University
December 2010
Talk Outline
• Physic Motivation • Big Bite detector status
• HAND (Hall A Neutron Detector) status
•Future plans
E07-006E07-006: Setup – Jan / Feb 2011Beam – Feb / March / Apr 2011
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
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
ee/
q2N – SRC
A~1057
e’ p p
n
Experimental setup: E07-006Experimental setup: E07-006
Beam
4He
HAND
BigBite
Lead wall
L-HRS R - HRS
R. Subedi et al., Science 320, 1476 (2008),
E01 – 015 - Short Range Correlations in E01 – 015 - Short Range Correlations in 1212C.C.
Missing momentum: 300 – 600 MeV/c
• 20 % of nucleons in 12C are in SRC
• Strong n – p dominance
•Strong sensitivity to the NN tensor force
Current Experiment:Current Experiment:E07-006 vs E01-015E07-006 vs E01-015 • Missing momentum 400 – 900 MeV/c
Tensor to Repulsive Core
E01-015 E07-006
Xb >1, Q2 = 2 [Gev/c]2 Xb >1, Q2 = 2 [Gev/c]2
300 – 600 MeV/c 400 – 900 MeV/c
Tensor Force Tensor to Repulsive core
Target – 12C Target – 4He(Less FSI)
BigBite and HAND BigBite with MWDCsUpgraded HAND(new lead wall)
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)
500 200 110 5
625 160 235 5
750 150 280 5
850 140 320 5
* Expected triple coincidence rate
Neuron Array – HANDNeuron Array – HANDUsed 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
Big Bite – Hadron Package
Detection of recoiled protons from SRC pairNon focusing dipole
E07 – 006E01-015
Hadron Package:
• 2 MWDC
• Trigger Plane (48 scintillators in 2 layers )
• 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 check2. Gain curves (done using Sr – 90 source)
Work Done in TestlabTesting done with Cosmic Rays
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 11th 2011
• Production: Starting March 3rd 2011
• 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:Postdocs and Graduate Students:
Thank you for Thank you for your attention!your attention!