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Update on the Monte Carlo Background Studies

Update on the Monte Carlo Background Studies. Kevin Kr öninger, MPI für Physik GERDA Collaboration Meeting, DUBNA, 06/27 – 06/29/2005. Event Simulation. Use MaGe to simulate energy loss of particles traversing detector Save true MC information (for cross checks) and energy

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Update on the Monte Carlo Background Studies

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  1. Update on the Monte Carlo Background Studies Kevin Kröninger, MPI für Physik GERDA Collaboration Meeting, DUBNA, 06/27 – 06/29/2005

  2. Event Simulation • Use MaGe to simulate energy loss of particles traversing • detector • Save true MC information (for cross checks) and energy • deposited in sensitive volumes (hits) • Add hits in each volume and smear according to resolution • taken from Canberra ReGe detector and require at least • 10 keV (digis) Kevin Kröninger, MPI München GERDA Collaboration Meeting DUBNA, 06/27 – 06/29/2005

  3. Event Generation • Used two different generators: • Decay0: Use for 0νββ and 2νββ as well as some • background sources (60Co, 214Bi, etc.) • Future → UseDecay5 (Qββ bug fix) • G4ParticleGun: Use for background sources in decay • chains or single isotopes like 68Ge • Future → Generate whole decay chain Kevin Kröninger, MPI München GERDA Collaboration Meeting DUBNA, 06/27 – 06/29/2005

  4. Analysis • Energy has to be in vicinity of Qββ within 10 keV window • Require Anti-Coincidence, i.e. only one segment fires • (Phase II: 3 x 6 segments) • No use of pulseshapes yet • Suppression factor is fraction of observed and simulated • events (the lower the better) Kevin Kröninger, MPI München GERDA Collaboration Meeting DUBNA, 06/27 – 06/29/2005

  5. Co-60 10 keV window around Qββ anticoincidence required Kevin Kröninger, MPI München GERDA Collaboration Meeting DUBNA, 06/27 – 06/29/2005

  6. Pb-210 10 keV window around Qββ anticoincidence required top, bottom middle Kevin Kröninger, MPI München GERDA Collaboration Meeting DUBNA, 06/27 – 06/29/2005

  7. 0νββ 10 keV window around Qββ Anti- coincidence required Kevin Kröninger, MPI München GERDA Collaboration Meeting DUBNA, 06/27 – 06/29/2005

  8. Overview / Results Kevin Kröninger, MPI München GERDA Collaboration Meeting DUBNA, 06/27 – 06/29/2005

  9. Conclusion • First background calculation for GERDA in Phase II setup • with MaGe is done • Background index is roughly 2·10-3 counts/kg/keV/y • → Factor of 2 off • Note GSTR-05-004 is avaiable at MPI-K website Kevin Kröninger, MPI München GERDA Collaboration Meeting DUBNA, 06/27 – 06/29/2005

  10. Future Plans • Keep updating geometry (e.g. holder, new crystals, etc.) • Use decay chains and calculate reduction factor for each • isotope and part • Keep updating activities for materials – TG11? • Include pulseshape information Kevin Kröninger, MPI München GERDA Collaboration Meeting DUBNA, 06/27 – 06/29/2005

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