Abstract
We measure the distribution of energy deposited in a 40 × 88 mm plastic scintillator by e+e− pair production of 4.44 MeV γ-rays. We observe the double-escape peak of 3.42 MeV from pair production by tagging 511 keV annihilation radiation in two high-Z scintillators. The source is a standard commercial neutron source using α-emitting 241Am encapsulated with 9Be, which has a reaction branch feeding the first Iπ=2+ state of 12C making the 4.44 MeV γ-rays. We demonstrate the extraction of the double-escape peak from the large neutron-produced backgound, and explore some of the features and difficulties of this technique with our apparatus.
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