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Update on the Monte Carlo Background Studies

This presentation discusses the updates and findings from Monte Carlo background studies conducted during the GERDA Collaboration Meeting in Dubna. Topics include event simulation, event generation, analysis techniques, and future plans for the project.

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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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