geo-neutrino working group goals and progress 10 december 2011- cider workshop
TRANSCRIPT
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 Institution2. University of Colorado
3. GEOTOP4. Hawaii Pacific University
5. IPGP6. University of Maryland
7. University of North Dakota8. South Dakota School of Mines Technology
9. University of Wyoming
Geo-neutrino Projects
(Enomoto, Neutrino Sciences 2007)operating
Japan
operating
Italy
Canada
2013
Finland
20??
Hanohano 20??
KamLAND- operational in Japan
νe + p → n + e+
Reactor antineutrinoinverse beta
Primary Goal
• operating since 3/9/02• 1000 tonnes LS• 1879 PMTs
Geo-neutrino result Gando et al., 2011
3.49x1032 p-y
KamLAND Geo-nu Data
Geonu signal of ~100 eventscompeting with
large background
Uncertainty in geo-nu signal
limited by systematic
error
Borexino- operational in ItalyPrimary Goal
νe + e- → νe + e-
Solar neutrino-electron scattering
Geo-neutrino resultBellini et al., 2010
0.15 x 1032 p-y• operating since 5/16/07• 300 tonnes LS• 2200 PMTs • ~30% PC coverage
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 statistical
error
Observations & Model Predictions
Mantle signal- 10 ±11 TNUMhhomogeneous mantle = 11 ±13 TW
Mantle signal- 39 +27/-23 TNUMhhomogeneous mantle = 45 +32/-26 TW
KamLAND 2011 (Th:U=3.9) Borexino 2010 (Th:U=3.9)
Gando et al., 2011 Bellini et al., 2010
Mantle- Signal, Heat, Th:U
Mantle signal is key to resolving geological models but masked
by crust error
EH
CI
GP
Site-dependent Measurement Error
Error5% reactor15% crust
Geo-neutrino Working Group Progress
Kite and Lekic; Sramek et al. Mareschal, Phaneuf, Jaupart
ULVPs thermal or chemical? Crust flux model discrepancy
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…
– + ???