The x<3 experiment. Patricia Solvignon UNH/JLab
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1 The <3 eperiment Patricia Slvignn UNH/JLab Net generatin nuclear physics with JLab1 and EIC FIU February 10-13, 016
2 E Spkespeple: P. Slvignn (JLab/UNH), J. Arringtn (ANL), D. Day (UVa), D. Higinbtham (JLab) Main physics gals Isspin-dependence Imprved precisin: etract R(T=1/T=0) t 3.8% FSI much smaller (inclusive) and epected t cancel in rati 3N SRCs structure (mmentum-sharing and isspin) Imprved A-dependence in light and heavy nuclei Average f 3 H, 3 He --> A=3 isscalar nucleus Determine isspin dependence --> imprved crrectin fr N>Z nuclei, etraplatin t nuclear matter Abslute crss sectins (and ratis) fr H, 3 H, 3 He: test calculatins f FSI fr simple, well-understd nuclei... Patricia Slvignn
3 : 1.469<Q <1.635 (GeV/c Preliminary Results f E Search fr three-nuclen shrt-range crrelatins in nuclei 3 1 : 1.57<Q <1.386 (GeV/c ) 6 4 Z. Ye, 1, P. Slvignn, 3, 4 P. Aguilera, 5 Z. Ahmed, 6 H. Albataineh, 7 K. Allada, 8 B. Andersn, 9 D. Anez, 10 K. Anil, 11 J. Annand, 1 W. Armstrng, 13 J. Arringtn, 14 T. Averett, 15 T. Badman, 4 H. Baghdasaryan, 1 X. Bai, 16 A σ 4 He / σ3 He rati 4 He/ 3 He Rati: E0019 Data (18 CLAS Data, Q =.7 GeV/c ) 5 : 1.458<Q <1.898 (GeV/c ) 3 : 1.469<Q <1.635 (GeV/c ) 1 : 1.57<Q <1.386 (GeV/c ) T be submitted t PRL (σ1 C /1)/(σ3 He /3) σ 1 C / σ3 He Rati: rati 1 C/ 3 He E0019 Data (18, Q =.7 GeV/c ) 8 :.138<Q <.313 (GeV/c ) 5 : 1.458<Q <1.898 (GeV/c ) 3 : 1.469<Q <1.635 (GeV/c ) 1 : 1.57<Q <1.386 (GeV/c ) 0 15 σ 1 C / σ3 He Rati: FIG.. (Clr nline) The 4 He/ 3 He (tp) and 1 C/ 3 He (bttm) crss sectin ratis at 1, 3, and 5 degrees, alng with results frm CLAS [1] and Hall C (E0-019) [14] measurements. The slid lines crrespnd t a simple crss sectin mdel based n parameterized mmentum distributins. E0019 Data (18, Q =.7 GeV/c ) E :.138<Q <.313 (GeV/c will ) perfrm the average f 3 H, 3 He --> A=3 isscalar nucleus 5 : 1.458<Q <1.898 (GeV/c ) 3 : 1.469<Q <1.635 (GeV/c ) 1 : 1.57<Q <1.386 (GeV/c ) N hint f secnd plateau? Patricia Slvignn 3
4 Onset f Scaling fr <<3 N hint f secnd plateau? Maybe ur Q is t lw?! Patricia Slvignn 4
5 Accessing the cmpnents f Taking deuterium data will allw: the spectral functin 1. Direct measures f the spectral functin in the isspin 1 channel:. Direct measures f the difference f the spectral functin in I=1 and I=0 channels: These results will prvide, in an independent way, a test f the bservatin f small values f (e,e pp)/(e,e pn) ratis. Patricia Slvignn 5
6 Isspin study frm 3 He/ 3 H rati Isspin independent: Simple mean field estimates fr N-SRC n-p (T=0) dminance: σ /3 3 He σ /3 = (σ +1σ ) /3 p n 3 (1σ H p + σ n ) /3 σ p 3σ $ $ $ n 1.40 σ /3 3 H (pn +1nn) /3 = /3 (pn +1pp) /3 =1.0 σ 3 He Inclusive crss sectin calculatin frm M. Sargsian using AV18/UIX dσ/dωde, μb/gev/sr He 3H rati Patricia Slvignn 6
7 3N-cnfiguratin (a) 1 3 etremely large mmentum p 3 = p 1 +p (b) 1 3 Star-cnfiguratin p 1 = p = p 3 (a) yields R( 3 He/ 3 H) 3.0 if nuclen #3 is always the dubly-ccurring nuclen (a) yields R( 3 He/ 3 H) 0.3 if nuclen #3 is always the singly-ccurring nuclen (a) yields R( 3 He/ 3 H) 1.4 if cnfiguratin is isspin-independent, as des (b) R 1.4 implies isspin dependence AND nn-symmetric mmentum sharing Patricia Slvignn 7
8 E : kinematics Beam current: 5 μa, unplarized, Raster interlck Beam energy: 17.5 Days 4.4 GeV [main prductin] QE N 3N Left HRS Right HRS ("parasitic") Left & Right HRS Left HRS running (380 hurs) Q (GeV ) } 6. E =. GeV Patricia Slvignn 8
9 E : kinematics Beam current: 5 μa, unplarized, Raster interlck Beam energy: 17.5 Days 4.4 GeV [main prductin] 1.5 days. GeV [checkut+qe] QE N 3N Left HRS Right HRS ("parasitic") Left & Right HRS Left HRS running (380 hurs) Left+Right HRS running (abut 1 day) Q (GeV ) } 6. E =. GeV Patricia Slvignn 9
10 E : kinematics Beam current: 5 μa, unplarized, Raster interlck Beam energy: 17.5 Days 4.4 GeV [main prductin] 1.5 days. GeV [checkut+qe] QE N 3N Right HRS running ( parasitic ) Eisting 3 H QE data limited Q 0.9 GeV Left HRS Right HRS ("parasitic") Left & Right HRS Left HRS running (380 hurs) Left+Right HRS running (abut 1 day) Q (GeV ) } 6. E =. GeV Patricia Slvignn 10
11 E : prjected results Isspin study f SRC Etractin f GM n % scale uncertainty nt shwn T=0 dminance isspin independence 17.0 (1.48<Q <1.58) 19.0 (1.75<Q <1.88) He/ 3 H H/ 3 He GeV, GeV, GeV, GeV, GeV, 8.5. GeV,. GeV, 6.. GeV, At >, 3 He/ 3 H 1.4 implies isspin dependence AND nn-symmetric mmentum sharing In PWIA, 3 He/ 3 H with 1.5% uncertainty crrespnds t 3% n G M n Patricia Slvignn 11
12 E : Neutrn Magnetic FF Wrld 3 H QE data: Q 0.9GeV This eperiment: 0.6, 0.8, 1.0, 1.4, 1.7,.4,.7 and 3.0 GeV In PWIA, 3 He/ 3 H with 1.5% uncertainty crrespnds t 3% n GM n Limited t Q 1 GeV, where QE peak has minimal inelastic cntributin This is the regin with ~8% discrepancy between the Ankin, Kubn data and the CLAS rati and the Hall A plarized 3 He etractin. Nuclear effects epected t be small, largely cancel in rati Patricia Slvignn 1
13 The Target System Frm D. Meekins (JLab) Main Bdy and Entrance Windw: ASTM B09 AL 7075-T651 Valve assy: SST 316 and Ci f T (0.1 g) ~00 psi at 95K 5 cm lng ID f 1.7mm Vlume = 34 cc Aluminum CF seals Patricia Slvignn 13
14 Tritium Eperiments scheduled t run in February 017 Thank yu Patricia Slvignn 14
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