Detection system for a β^+ - ν correlation experiment in a magneto-optical trap

Physics – Nuclear Physics

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Scientific paper

Experiments with magneto-optically trapped ^38mK at TRIUMF are currently underway that use a micro-channel plate (MCP) and β telescope to observe the recoiling Ar and β^+ respectively. The β telescope consists of a 5.5cm diameter x 6.5cm BC408 plastic scintillator mounted behind an X-Y position sensitive double-sided Si-strip detector (PSD). Coincidences between the ΔE and E detectors allow an efficient veto of γ backgrounds and provide 1mm spatial resolution of the detected positron. The scintillator was designed with the aid of monte carlo simulations for minimized lineshape tail and uniformity of response to E_β^+ and position, resulting in fracΔ EE = 9.7 % at 1.6MeV. This energy measurement, the < 1ns relative timing between the MCP and scintillator, and the position information from the MCP and PSD together provide overdetermined kinematic information, useful for rejecting backgrounds and assessing systematic errors.

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