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Search for Neutrinoless double beta-decays with the Enriched Xenon Observatory

Search for Neutrinoless double beta-decays with the Enriched Xenon Observatory. Derek Mackay and Nicole Ackerman. What are we doing here?. Moving the Clean Rooms (x 6)!. The Xe vessel. Vacuum insulation. HFE (Heat transfer fluid). 25cm enclosure of low activity lead. EXO TPC Detector

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Search for Neutrinoless double beta-decays with the Enriched Xenon Observatory

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  1. Search for Neutrinoless double beta-decays with the Enriched Xenon Observatory Derek Mackay and Nicole Ackerman

  2. What are we doing here?

  3. Moving the Clean Rooms (x 6)!

  4. The Xe vessel Vacuum insulation HFE (Heat transfer fluid) 25cm enclosure of low activity lead

  5. EXO TPC Detector Inside Xenon Vessel

  6. EXO’s Crown Jewels Largest enriched isotope stockpile in the world unrelated to the Nuclear Weapon/Energy Industry

  7. Russian Enrichment Facility Part of EXO Funding rationalization was to keep enrichment Facilities Occupied with non-Nuclear Weapon Activities

  8. Next Generation EXO- Barium Tagging LHe cryostat Actuator SXe-coated tip Can potentially completely eliminate background events LXe cell

  9. Quadrupole Trap for Ba Ions U CCD Spectroscopy lasers Scope Vcos(Ωt) + U 0 Volts DC potential [V] -5 Volts

  10. Identifying the Barium 2P1/2 650nm 493nm metastable 47s 4D3/2 2S1/2

  11. Case Mass (ton) Eff. (%) Run Time (yr) σE/E @ 2.5MeV (%) Radioactive Background (events) T1/20ν (yr, 90%CL) Majorana mass (meV) QRPA1 NSM2 Case Mass (ton) Eff. (%) Run Time (yr) σE/E @ 2.5MeV (%) 2νββ Background (events) T1/20ν (yr, 90%CL) Majorana mass (meV) QRPA1 NSM2 EXO-200 0.2 70 2 1.6* 40 6.4*1025 133 186 Conservative 1 70 5 1.6* 1 2*1027 24 33 Aggressive 10 70 10 1† 1 4.1*1028 5.3 7.3 EXO-200 Sensitivity (Current Experiment) Next Generation EXO Sensitivity

  12. EXO Schedule • Current Status: All Clean Rooms are underground and are in the process of being reassembled. • March 2008: Complete a full cool down test of the system (full test except for the actual detector – a test chamber will be used instead) • August 2008: Complete cool down test with actual detector with natural “cheap” Xenon. • Fall 2008: Start Data run with enriched Xenon

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