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E06007, March 3 -> March 26, 2007 208 Pb(e,ep) 207 Tl, 209 Bi(e,ep) 208 Pb Impulse Approximation limitations to the (e,e',p) reaction on 208 Pb, identifying.

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Presentation on theme: "E06007, March 3 -> March 26, 2007 208 Pb(e,ep) 207 Tl, 209 Bi(e,ep) 208 Pb Impulse Approximation limitations to the (e,e',p) reaction on 208 Pb, identifying."— Presentation transcript:

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

2 Outline 1)Objectives of experiment 2)Optics and raster correction work (Guido Urciuoli, Joaquin Lopez, Juan Carlos Cornejo) 3)Survey of some results and comparison to earlier experiments 4)Plans for upcoming run in January 2008

3 (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 p miss. Excess strength here is theoretically identified as due to LRC. Objectives c) Search for Q 2 dependence of spectroscopic factors. 207 Tl, low lying states g.s. 3s1/2 0.351 2d3/2 1.348 1h11/2 1.683 2d5/2 3.470 1g7/2

4 (II) Identify dynamical relativistic effects in nuclear structure. Objectives Measure cross section asymmetry A TL around the three momentum transfer. Relativistic mean field theory predicts an A TL dependence on p miss < 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 A TL behavior.

5 Online data base HRSR, carbon target 83 mg/cm 2 Optics

6 Progress in data base change HRSR, carbon target 83 mg/cm 2 optics

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

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

9 0 3.470 8 Data survey

10 Pb, simulation, pmiss = 300 MeV/c

11 207 Tl, low lying states g.s. 3s1/2 0.351 2d3/2 1.348 1h11/2 1.683 2d5/2 3.470 1g7/2 Quint et al. PRL 57, 186 (1986) Bobeldiik et al., PRL 73, 2864 (1994) Parallel kinematics, E 0 = 410, 350 MeV Low p miss E 0 = 487.3 MeV, x B = 0.18 High p miss

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

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

14 0 5 209 Bi(e,ep) 208 Pb P miss = 200 MeV/c Data survey 50 keV/bin

15 209 Bi(e,ep) 208 Pb 209 Bi(,p) 208 Pb D. Branford et al. PRC 63 014310 (2000) 0 E 0 = 293 and 410 MeV, Parallel kinematics 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) -1 150

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16 January 2008 run Jan. 20-Jan. 30, E06007 and PREX tests Measure p miss = 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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