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 ¹¹B and ¹⁹F 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.
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Stiebing et al. (2004) studied this question.
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