München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 2: Elektromagnetische und Hadronische Sonden
HK 2.4: Gruppenbericht
Montag, 20. März 2006, 15:30–16:00, F
First investigation of the (e,e′pn) reaction. — •Duncan Middleton — Physikalisches Institut, Universität Tübingen, Auf der Morgenstelle 14, 72076, Tübingen.
At intermediate electron energies the (e,e′pn) cross-section is sensitive to nucleon-nucleon tensor correlations and two-body mechanisms like Δ-excitation and meson exchange currents as well as final state interactions. The reaction has been studied at a wide range of kinematic settings on a 3He target and at super-parallel kinematics on an 16O target. For both targets final cross sections have been obtained.
The experiment was carried out using the 3-spectrometer facility of the A1-collaboration at the Mainz 855 MeV electron microtron MAMI. Spectrometer B was used to detect the scattered electrons; a large plastic scintillator hodoscope, HADRON3, was used to detect the protons; and a large time-of-flight scintillator array, TOF, was used for detection of the neutrons.
Here we report on the first succesful measurement of the (e,e′pn) reaction on 3He and 16O targets. The 3He data are compared to continuum wave Faddeev calculations of the
Bochum group; these were applied to the experimental conditions allowing
a direct comparison to the measured cross sections to be made. The data measured on 16O are compared to theoretical calculations
by the Pavia group based on realistic correlated NN wave functions.
This work was sponsored by the DFG, EPSRC and NWO.