Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 70: Hadron Structure and Spectroscopy II

HK 70.8: Vortrag

Donnerstag, 19. März 2009, 18:45–19:00, H-ZO 30

Experiment E06007 at Jefferson Lab — •Guido Maria Urciuoli — Instituto Nazionale di Fisica Nucleare, Sezione Roma 1

Experiment E06007 at Jefferson Lab measured cross sections for the (e,e′p) reaction at constant (q,ω ) for Q² = 0.81 GeV² over a wide range of missing momenta. At missing momentum p_m = 0 MeV/c cross sections were also measured at Q² = 1.4 GeV² and 1.97 GeV². E06007 experiment addresses several issues concerning our understanding of the nuclear structure. The role of relativity in the description of nuclei is clarified thanks to the measurement of the asymmetry A_TL in the cross section, measured forward or backward of the three momentum transfer q. This asymmetry is a distinctive signature of dynamical relativistic effects in the nucleon wave function. The role of the correlations on the strength of high momentum components of single nucleon states is also investigated by the measurement of the cross sections for missing momenta from 300 MeV/c to 500 MeV/c for the ²⁰⁸Pb(e,e’p) reaction going to the low lying states of ²⁰⁷Tl. Furthermore a possible dependence of the spectroscopic factors on Q² suggested by previous experimented is studied. To achieve all these goals a very good energy resolution was needed. The experiment made use of the two High Resolution Spectrometer (HRS) located in experimental Hall A at Jefferson Lab and of the high monochromatic, small emittance, JLab electron beam. A special effort was involved to optimize the optical performances of HRS. The preliminary results of E06007 and their comparison to theoretical predictions will be shown.