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!