Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2003-11-03
J.Phys.G30:165-180,2004
Physics
Nuclear Physics
Nuclear Experiment
20 pages, 8 figures
Scientific paper
10.1088/0954-3899/30/2/014
A multi-detector array has been constructed for the simultaneous measurement of energy- and angular correlation of electron-positron pairs produced in internal pair conversion (IPC) of nuclear transitions up to 18 MeV. The response functions of the individual detectors have been measured with mono-energetic beams of electrons. Experimental results obtained with 1.6 MeV protons on targets containing $^{11}$B and $^{19}$F show clear IPC over a wide angular range. A comparison with GEANT simulations demonstrates that angular correlations of $e^+e^-$ pairs of transitions in the energy range between 6 and 18 MeV can be determined with sufficient resolution and efficiency to search for deviations from IPC due to the creation and subsequent decay into $e^+e^-$ of a hypothetical short-lived neutral boson.
Bethge K.
Bokemeyer H.
de Boer Fokke W. N.
Froehlich O.
Klinken van J.
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