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E06007, March 3 -> March 26, 2007

E06007, March 3 -> March 26, 2007. 208 Pb(e,e’p) 207 Tl, 209 Bi(e,e’p) 208 Pb. x=1, q = 1 GeV/c, w = 0.433 GeV, Q 2 = 0.81 to 1.97 (GeV/c) 2. Impulse Approximation limitations to the (e,e',p) reaction on 208 Pb, identifying correlations and relativistic effects in the nuclear medium.

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E06007, March 3 -> March 26, 2007

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  1. E06007, March 3 -> March 26, 2007 208Pb(e,e’p)207Tl, 209Bi(e,e’p)208Pb x=1, q = 1 GeV/c, w = 0.433 GeV, Q2 = 0.81 to 1.97 (GeV/c)2 Impulse Approximation limitations to the (e,e',p) reaction on 208Pb, identifying correlations and relativistic effects in the nuclear medium Students: Juan Carlos Cornejo (CSULA) Joaquin Lopez (U. Madrid)

  2. Outline • Objectives of experiment • Optics and raster correction work (Guido Urciuoli, Joaquin Lopez, Juan Carlos Cornejo) • Survey of some results and comparison to earlier experiments • Plans for upcoming run in January 2008

  3. Objectives (I) Long Range Correlations search a) Measure spectroscopic factors for states near the Fermi level. Spectroscopic factors depend on SRC and LRC. b) Measure cross sections for these low lying states to 500 MeV/c in pmiss. Excess strength here is theoretically identified as due to LRC. c) Search for Q2 dependence of spectroscopic factors. 207Tl, low lying states g.s. 3s1/2 0.351 2d3/2 1.348 1h11/2 1.683 2d5/2 3.470 1g7/2

  4. Objectives (II) Identify dynamical relativistic effects in nuclear structure. Measure cross section asymmetry ATL around the three momentum transfer. Relativistic mean field theory predicts an ATL dependence on pmiss< 300 MeV/c due to dynamical enhancement of the lower component of the nucleon wave function. Calculations which do not include the enhancement of the lower component predict a substantially different ATL behavior.

  5. Online data base HRSR, carbon target 83 mg/cm2 Optics

  6. Progress in data base change HRSR, carbon target 83 mg/cm2 optics

  7. Kin02 Carbon target Raster correcting formula: -1194*ReactPt_L.y -17560*ReactPt_L.y**2 Run 1232 Raster OFF FWHM ~ 1 MeV Run 1231 Raster ON FWHM ~ 1 MeV Raster Correction to 2nd order

  8. 12C(e,e’p)11B, small acceptance GEANT simulation using nominal spectrometer resolutions plus data with online optics data base. sm 815 keV Cannot expect better than 815 keV resolution

  9. 3.470 8 0 Data survey

  10. Pb, simulation, pmiss = 300 MeV/c

  11. Quint et al. PRL 57, 186 (1986) Parallel kinematics, E0 = 410, 350 MeV Low pmiss 207Tl, low lying states g.s. 3s1/2 0.351 2d3/2 1.348 1h11/2 1.683 2d5/2 3.470 1g7/2 E0 = 487.3 MeV, xB = 0.18 High pmiss Bobeldiik et al., PRL 73, 2864 (1994)

  12. 11B 207Tl 0.351 0 5.5 1.683 8 Data survey

  13. GEANT simulation, C with Pb kinematics, pmiss = 0 MeV/c 11B gs and no 207Tl continuum C Pb dp/p = +- 1.0e-4, dh = +- 0.3mr, dv = +- 1.0mr

  14. 209Bi(e,e’p)208Pb Pmiss = 200 MeV/c 5 0 50 keV/bin Data survey

  15. 150<pmiss<210 MeV/c D. Branford et al. PRC 63 014310 (2000) 209Bi(e,e’p)208Pb E0 = 293 and 410 MeV, Parallel kinematics 0 States at 4.1 and 5.4 MeV are 500 keV wide. Believed to be configuration mixed states: p(1h9/2)x(3s1/2)-1 p(1h9/2)x(2d3/2)-1 p(1h9/2)x(1h11/2)-1 p(1h9/2)x(2d5/2)-1 209Bi(g,p)208Pb

  16. January 2008 run Jan. 20-Jan. 30, E06007 and PREX tests • Measure pmiss = 400 and 500 MeV/c, use 0.5mm tgt • New target design suggested by Bogdan • – maximize contact of diamond and lead • SRF prepares clean surfaces on diamond and lead in vacuum • press diamond/Pb/diamond sandwich together under vacuum producing “cold weld” • E06-007 will be running in close collaboration with the PREX tests • Request for shift sign-ups coming shortly

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