Geo-neutrino Working GroupGoals and Progress

10 December 2011- CIDER Workshop

Geo-neutrinologistsS 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 Institution2. University of Colorado3. GEOTOP4. Hawaii Pacific University5. IPGP6. University of Maryland7. University of North Dakota8. South Dakota School of Mines Technology9. University of Wyoming

Geo-neutrino Projects(Enomoto, Neutrino Sciences 2007)Finland20??

KamLAND- operational in Japan operating since 3/9/02 1000 tonnes LS 1879 PMTsGeo-neutrino result Gando et al., 20113.49x1032 p-y

KamLAND Geo-nu DataGeonu signal of ~100 eventscompeting withlarge backgroundUncertainty in geo-nu signal limited by systematic error

Borexino- operational in ItalyGeo-neutrino resultBellini et al., 20100.15 x 1032 p-y operating since 5/16/07 300 tonnes LS 2200 PMTs ~30% PC coverage

Borexino Geo-nu dataGeo-nu signal of ~10 events collected in ~ 5% KamLAND exposure yet similar precision:Controlled backgroundUncertainty in geo-nu signal limited by statistical error

Observations & Model PredictionsMantle signal- 10 11 TNUMhhomogeneous mantle = 11 13 TWMantle signal- 39 +27/-23 TNUMhhomogeneous mantle = 45 +32/-26 TWKamLAND 2011 (Th:U=3.9)Borexino 2010 (Th:U=3.9)Gando et al., 2011Bellini et al., 2010

Mantle- Signal, Heat, Th:U

Mantle signal is key to resolving geological models but masked by crust error

Error5% reactor15% crust

Geo-neutrino Working Group ProgressKite and Lekic; Sramek et al.Mareschal, Phaneuf, JaupartULVPs thermal or chemical?Crust flux model discrepancy

Geo-neutrino Working Group GoalsIdentify and implement projects that maximize geological information from terrestrial antineutrino observationGeoscience community- seismology, heat flow, geochemistry, geophysics, mineral physics, +Improve precision of crust flux estimatessee mantle from continentsDetermine exposures required to test hypothesesSuper-plumes thermal or compositionalCrust flux predicted by CRUST 2.0 or heat flowMore+ ???

**