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4 He(e,e'p)X, April 13 and April 14, 2011, 16 hours

Students: S. Iqbal(CSULA), N. McMahon(CNU) Spokespersons: A. Saha, D. Higinbotham, F. Benmokhtar, S. Gilad, K. Aniol Hall A Collaboration Experiment. 4 He(e,e'p)X, April 13 and April 14, 2011, 16 hours Measured P miss at 0.153 to 1.0 GeV/c, x b = 1.24, Q 2 = 2 (GeV/c) 2

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4 He(e,e'p)X, April 13 and April 14, 2011, 16 hours

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  1. Students: S. Iqbal(CSULA), N. McMahon(CNU) Spokespersons: A. Saha, D. Higinbotham, F. Benmokhtar, S. Gilad, K. Aniol Hall A Collaboration Experiment • 4He(e,e'p)X, April 13 and April 14, 2011, 16 hours Measured Pmiss at 0.153 to 1.0 GeV/c, xb = 1.24, Q2 = 2 (GeV/c)2 • Extension of SRC 2 body data which measured Pmiss from 0.4 to 1 GeV/c • Actual target thickness(20 cm), 20 K at 10 atm = 1x1023/cm3 • Target thickness from proposal(10cm) 6 K at 10 atm = 1.24x1023/cm3 1

  2. Motivation – Cross sections for 4He(e,e'p)3H, xb=1.25andNucleon Correlations 4He is fundamental for nuclear microscopic theory. Theory must include many body forces for the 4 body system. First measurement of 4He(e,e'p)X at this value of xb >1. Theory should be able to account for all the nucleon channels. X = 3H, n+2H, n+n+p Compare to theoretical cross sections (4He(e,e'p)3H, xb=1.25) Compare to F. Benmokhtar results at 3He(e,e'p)X (xb =1) for 2 body absorption peak in continuum. 2

  3. 0.153 GeV/c For central kinematics 4He(e,e'p)X Missing Energy 150 MeV/c 0.353 GeV/c triton 380 MeV/c 0.500 GeV/c 0.625 GeV/c 500 MeV/c 2 body absorption 625 MeV/c 0.755 GeV/c 755 MeV/c 800 MeV/c Under analysis 0.800 GeV/c

  4. Steps in the Analysis for 4He(e,e'p)3H We have overlapping missing momentum bins for 0.153 and 0.353 GeV/c kinematic settings Divide missing momentum into 50 MeV/c bins in data Divide missing momentum into 50 MeV/c bins in simulation Compare data from two kinematic settings using simulation Efficiencies TBD e.g. dead time, acceptances, target density and beam heating effects, match (w,q) cuts 4

  5. Preliminary triton yields/electron - Simulation assumes uniform illumination of spectrometer apertures. Have received theory RDWA from Madrid Next step to include theory in simulation. 5

  6. Similar 2 body absorption seen in 3He – needs 3bbu to fit cross section F. Benmokhtar, et al. E89044 Phys.Rev.Lett.94:082305,2005 3He(e,e'p)X, Q2=1.55 GeV2, xb = 1 Emiss (MeV)

  7. Next Steps xb = 1.25, Q2 = 2 (GeV/c)2 4He(e,e'p)X Get experimental cross sections • Get more theory calculations for 2 body. We have Madrid’s calculations now • Need theory for 3 body. We have promises. • Extract the Effective Density and compare to 3He. See if there is scaling! 0.153 GeV/c 0.353 GeV/c 0.500 GeV/c 0.625 GeV/c 0.755 GeV/c L Emiss

  8. Extra Slides for backup

  9. Semi-Inclusive A(e,e’p)Xprobes a p-n pair? -Pm Pm 3He(e,e'p)X, Q2=1.55 GeV2, xb = 1 Jlab-E89044 Hall A experiment. Example: e’ e p = q-Pm q,  Missing Energy Pm 9

  10. Effective Density Distribution 3He(e,e'p)X, Q2=1.55 GeV2, xb = 1 • J. M. Laget Calculations (Fadeev WF and Paris Potential ( diagramatic approach) • Also available are calculations from C. degli-Atti et al., using realistic wave function with generalized Eikonal approximation for FSI. • Conclusions: Both Correlations in initial state and Final State Interactions play a role in this strength .

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