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Possible IDEA Topics for FP7

Possible IDEA Topics for FP7. Stefan Schoenert MPIK Heidelberg. Overview. JRA/NW Experimental benchmark tests for nuclear structure calculations: charge exchange experiments, muon capture, …. Or more fantastic: beta beams

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Possible IDEA Topics for FP7

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  1. Possible IDEA Topics for FP7 Stefan Schoenert MPIK Heidelberg

  2. Overview • JRA/NW • Experimental benchmark tests for nuclear structure calculations: charge exchange experiments, muon capture, …. Or more fantastic: beta beams • Improved screening facilities: Pushing the sensitivity of U-238 progenies (Ra-226 and below) and Th-228 progenies screening to the 1 Bq/kg limit (bulk) : • Bulk contamination: array of germanium • Surface activities: large surface alpha counter (10 Bq/m^2) • Active suppression methods to reach bgd index <10-4 cts/keV kg y in Germanium experiments • Design study: • Few 10 meV scale: • Funded experiments : Cuore, GERDA-I/II (III depending of physics results) • Funded R&D: Super-Nemo • New technology: Cobra, Edelweiss-type Ge,  design study for 1 meV scale? Is this too early?

  3. Experimental benchmark tests for nuclear structure calculations: charge exchange Dieter Frekers, Erice 05

  4. Experimental benchmark tests for nuclear structure calculations: charge exchange Dieter Frekers, Erice 05

  5. Improved screening facilities GeMPI Operated at LNGS (3500 m w.e.) background (peak) count rates [c/kg y] Two new systems built: GeMPI-2 GeMPI-3 From G. Heusser

  6. Array of GeMPI type of detectors ? Cost: ~ 1MEuro Major efforts: Underground machining facilities CNC, wire erosion, underground Crystal mounting and testing; Need to be lead by underground laboratory

  7. Surface screening detector • Alpha counting with sensitivity of 1 alpha/day/m^2 • Dimension ~ 1m x 1m • Not quite a BiPo detector as proposed for Super-Nemo

  8. Active suppression methods to reach bgd index <10-4 cts/keV kg y in Germanium experiments Example: Internal 60Co 1: 1.173 MeV 2: 1.332 MeV : Emax = 318 keV • T0 : crystal growing • 0.017 Bq/kg per day exposure • Test: detector production in 7.4 days • Assume 30 days  2.5 ·10-3 / (keV·kg·y)

  9. 1 2 Q 1+ 2 60Co background spectrum MC simulation  2 kg

  10. 60Co: suppression by segmentation Q MC simulation 2 kg

  11. 60Co: suppression by segmentation Q MC simulation Nhit = 3 ~10 (7 seg.) Nseg = 1 2 kg illustration: Simple 7-fold segmentation

  12. 60Co: suppression by LAr Ge-anticoinc. Q MC simulation Liquid Argon ~100 LAr anticoinc. 2 kg

  13. ~1000 60Co: segmentation and LAr Ge-anticoinc. Q MC simulation Liquid Argon Nseg = 1 AND LAr anticoinc 2 kg

  14. Design study Few 10 meV scale: • Funded experiments : Cuore, GERDA-I/II (III depending of physics results) • Funded R&D: Super-Nemo • New technology: Cobra, Edelweiss-type Ge,  design study for 1 meV scale

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