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Plastic scintillator studies for future bb experiments

Plastic scintillator studies for future bb experiments. Ruben Saakyan University College London IDEA meeting Zaragoza 7-8 November 2005. Motivation. At least one of future bb experiments should be a “tracking calorimeter” SuperNEMO MOON A combination of the two…? ….

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Plastic scintillator studies for future bb experiments

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  1. Plastic scintillator studies for future bb experiments Ruben Saakyan University College London IDEA meeting Zaragoza 7-8 November 2005

  2. Motivation • At least one of future bb experiments should be a “tracking calorimeter” • SuperNEMO • MOON • A combination of the two…? • …. • Plastic scintillators is a good candidate • Cheap (large quantities will be needed) • Good timing resolution • Surface contamination measurement • Main task of R&D – to improve DE/E

  3. Plastic scintillator strips Advantages • Long strip ( ≥ 2m) read from both end “removes” PMTs from the sensitive part of the detector – good background wise for bb and radioactivity measurements • Especially for isotopes with long T1/22n • 130Te, 136Xe, 82Se… • Fewer PMT channels “Standard” readout method • Continuation of successful studies of plastic scintillator blocks funded by PPARC (seed corn money) • “Standard” method of WLS readout will not work for our needs (impossible to get more than ~40-50 p.e./MeV)

  4. ILIAS money spent for the project Total award 19200

  5. The Setup Left PMT Right PMT -100cm -80cm -60cm -40cm -20cm +20cm +40cm +60cm +80cm +100cm 0 0 207Bi AND/OR Scintillator material: polyvinyltoluene (PVT) from Bicron Existing DAQ electronics (CAMAC+NIM) and 207Bi source used

  6. The Method

  7. The measurement Subtracted electron spectra (sum from both ends)

  8. Single sided readout

  9. L/R ratio. Attenuation length. “Effective” attenuation length – 170 cm

  10. Energy resolution 400 p.e.

  11. Can we use timing from 2 pmts to reconstruct Z-coordinate? (Rpmt – Lpmt) time difference as a function of the source position Can reconstruct the position of the source within ~ 5cm (inclusive measurement)

  12. Time resolution s = 1ns ~9 cm The resolution is mainly determined by compton electrons from gammas. If e-like events can be identified the timing resolution should improve a lot and 5-10 cm accuracy (3s) might be reachable. An interesting possibility for background rejection

  13. Summary • At leastDE/E = 11% @ 1MeV (FWHM) is achievable with plastic scintillator strips of ≥ 2m. • Further improvements are likely to be possible with modest R&D • Reflective coating • Scintillator-PMT coupling • Z-reconstruction can be used for background rejection • Simulations are needed to determine requirements (DE/E, Dt/t etc…)for a particular bb experiment or contamination measurement • How to integrate this work into IDEA “official” activities

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