Geoneutrinos, JinPing and the Earth Bill McDonough, Scott Wipperfurth Yu Huang and + Ondřej Šrámek Geology, U Maryland Fabio Mantovani and *Virginia.

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Presentation transcript:

Geoneutrinos, JinPing and the Earth Bill McDonough, *Scott Wipperfurth *Yu Huang and + Ondřej Šrámek Geology, U Maryland Fabio Mantovani and *Virginia Strati, Physics, U Ferrara and INFN, Italy Steve Dye, Natural Science, Hawaii Pacific U and Physics, U Hawaii John Learned, Physics, U Hawaii * graduate student + post-doc

Plate Tectonics, Convection,Geodynamo Radioactive decay driving the Earth’s engine! K, Th & U!

5 Big Questions: - What is the Planetary K/U ratio? - Radiogenic contribution to heat flow? - Distribution of reservoirs in mantle? - Radiogenic elements in the core?? - Nature of the Core-Mantle Boundary? planetary volatility curve secular cooling whole vs layered convection Earth energy budget hidden reservoirs

U in the Earth: ~13 ng/g U in the Earth Metallic sphere (core) <<<1 ng/g U Silicate sphere 20* ng/g U *O’Neill & Palme (2008) 10 ng/g *Turcotte & Schubert (2002) 31 ng/g Continental Crust 1300 ng/g U (~7 TW) Mantle ~13* ng/g U (~13 TW) *Mantle could have as little 1-3 TW or as much as 28 TW [Th/U = 3.9, K//U = 1.3 x 10 4 ]

after Jaupart et al 2008 Treatise of Geophysics Mantle cooling (18 TW) Crust R* (7 ± 1 TW) (Huang et al ‘13) Mantle R* (13 ± 4 TW) Core (~15 TW) Earth’s surface heat flow 46 ± 3 (47 ± 1) TW (0.4 TW) Tidal dissipation Chemical differentiation *R radiogenic heat (after McDonough & Sun ’95) total R* 20 ± 4 (alternatively, 1 or 28 TW)

Reactor and Earth Signal KamLAND was designed to measure reactor antineutrinos. Reactor antineutrinos are the most significant contributor to the total signal. KamLAND Reactor Background with oscillation Geoneutrinos

Summary of geoneutrino results SILICATE EARTH MODELS Cosmochemical: uses meteorites – 10 TW Geochemical: uses terrestrial rocks –20 TW Geodynamical: parameterized convection – 30 TW

Geoneutrino Flux on Earth Surface Earth structure (  and L) and chemical composition (a) Activity and number of produced geoneutrinos Volume of source unit Survival probability function Distance between source unit and detector

Constructing a 3-D reference model Earth assigning chemical and physical states to Earth voxels

Global Earth Reference Model -7 layers for the top 200 km -Integrate 3 global models for the crust -New crust model with uncertainties Huang et al (2013) G-cubed

Uranium Abundance in Middle Continental Crust layer Average middle Cont. Crust U abundance is  g/g Rudnick and Gao (2003) Treatise of Geochemistry 1.3  g/g U MCC (  g/g) SNO+ KL BX JP

Predicted Global geoneutrino flux based on our new Reference Model Huang et al (2013) G-cubed, 14:6, doi: /ggge doi: /ggge.20129

Hanohano International ocean-based (10kt) LENA, EU (50kt) JUNO China (20kt) Future detectors? JinPing next generation - many small detectors - one big one?

JinPing Geoneutrino Detector Understanding the Earth -How the continents grow -How mountains move -Distribution of heat producing elements Location is important!

Y-axis data is strictly from physics X-axis data is strictly from geology Intercept is mantle contribution Existing data limit coincidences of intercepts JinPing Hanohano

SUMMARY Earth’s radiogenic (Th & U) power 22 ± 12 TW - Borexino 11.2 TW - KamLAND Prediction: models range from 8 to 28 TW (for Th & U) On-line and next generation GEO-NEUTRINO experiments: -SNO+ online JUNO: 2020, good experiment, big bkgd, geonu … -Hanohano: this is how to look at the mantle-only ***** -JinPing: 20XX, excellent experiment, low bkgd, big issues IMPORTANT CONSIDERATIONS: WbLS and directionality