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Geo-neutrino Working Group

Geo-neutrino Working Group. Goals and Progress 10 December 2011- CIDER Workshop. Geo-neutrinologists. S Dye 4 , Y Huang 6 , W Gosnold 7 , C Jaupart 5 , V Lekic 6 , J-C Mareschal 3 , WF McDonough 6 , C Phaneuf 3 , W Roggenthen 8 , R Rudnick 6 , S Shirey 1 , K Sims 9 , O Sramek 6 , S Zhong 2

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Geo-neutrino Working Group

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  1. Geo-neutrino Working Group Goals and Progress 10 December 2011- CIDER Workshop

  2. Geo-neutrinologists S Dye4, Y Huang6, W Gosnold7, C Jaupart5, V Lekic6, J-C Mareschal3, WF McDonough6, C Phaneuf3, W Roggenthen8, R Rudnick6, S Shirey1, K Sims9, O Sramek6, S Zhong2 1. Carnegie Institution 2. University of Colorado 3. GEOTOP 4. Hawaii Pacific University 5. IPGP 6. University of Maryland 7. University of North Dakota 8. South Dakota School of Mines Technology 9. University of Wyoming

  3. Geo-neutrino Projects Finland Canada 2013 20?? Italy Japan operating (Enomoto, Neutrino Sciences 2007) Hanohano 20?? operating

  4. Primary Goal νe+p→ n + e+ Reactor antineutrino inverse beta KamLAND- operational in Japan • operating since 3/9/02 • 1000 tonnes LS • 1879 PMTs Geo-neutrino result Gando et al., 2011 3.49x1032 p-y

  5. KamLAND Geo-nu Data Geonu signal of ~100 events competing with large background Uncertainty in geo-nu signal limited by systematicerror

  6. Primary Goal νe+ e- →νe+ e- Solar neutrino- electron scattering Borexino- operational in Italy Geo-neutrino result Bellini et al., 2010 0.15 x 1032 p-y • operating since 5/16/07 • 300 tonnes LS • 2200 PMTs • ~30% PC coverage

  7. Borexino Geo-nu data Geo-nu signal of ~10 events collected in ~ 5% KamLAND exposure yet similar precision: Controlled background Uncertainty in geo-nu signal limited by statisticalerror

  8. Observations & Model Predictions Gando et al., 2011 Bellini et al., 2010 KamLAND 2011 (Th:U=3.9) Borexino 2010 (Th:U=3.9) Mantle signal- 10 ±11 TNU Mhhomogeneous mantle= 11 ±13 TW Mantle signal- 39 +27/-23 TNU Mhhomogeneous mantle= 45 +32/-26 TW

  9. Mantle- Signal, Heat, Th:U GP Error 5% reactor 15% crust CI EH Mantle signal is key to resolving geological models but masked by crust error Site-dependent Measurement Error

  10. Geo-neutrino Working Group Progress Kite and Lekic; Sramek et al. Mareschal, Phaneuf, Jaupart ULVPs thermal or chemical? Crust flux model discrepancy

  11. Geo-neutrino Working Group Goals • Identify and implement projects that maximize geological information from terrestrial antineutrino observation • Geoscience community- seismology, heat flow, geochemistry, geophysics, mineral physics, +… • Improve precision of crust flux estimates • “see” mantle from continents • Determine exposures required to test hypotheses • Super-plumes thermal or compositional • Crust flux predicted by CRUST 2.0 or heat flow • More… • + ???

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