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Geoneutrinos Next step of geoneutrino research

Geoneutrinos Next step of geoneutrino research. Leonid Bezrukov Valery Sinev INR, Moscow 2014. Geoneutrino defenition. 238 U, 235 U, 232 Th, 40 K decays in the Earth body are the source of geoneutrinos . Geoneutrino fluxes are less than Solar neutrino fluxes on the Earth.

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Geoneutrinos Next step of geoneutrino research

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  1. GeoneutrinosNext step of geoneutrino research Leonid Bezrukov Valery Sinev INR, Moscow 2014

  2. Geoneutrinodefenition • 238U, 235U, 232Th, 40K decays in the Earth body are the source of geoneutrinos. • Geoneutrino fluxes are less than Solar neutrino fluxes on the Earth. • Geoneutrino flux on the Earth surface depends on U, Th, K concentrations in the Earth. • Geoneutrino flux on the Earth surface depends also on U, Th, K distribution into the Earth interior.

  3. For what we need to investigate the geoneutrino flux? • Solar neutrino was successfully used to investigate the Solar interior. • Analogically we can ask : Can the geoneutrino give the information about Earth interior?

  4. Earth model Crust:7-10kmat ocean bottom and30-60 kmat continents, r=~3-3.5g/cm3 Upper mantle: ~660-670 km, r=~3.5-4g/cm3 Lower mantle: ~2900 km, r=~5g/cm3 Outer core, ~5140 km, r=~10-11g/cm3 Inner core, ~6371 km, r=~12-13g/cm3, t = 6000° С At site http://igppweb.ucsd.edu/~gabi/data for 2° х 2° were available. (Now 1°х1° ) "Neutrino Physics and Astrophysics“, Valday, Russia, Jan 27 - Feb 2, 2014

  5. Standard Earth model = = Bulk Silicate Earth (BSE) Basic idea: Earth chemical composition ≡ meteorite chemical composition ≡ Asteroid Belt (AB) chemical composition

  6. Bulk Silicate Earth (BSE) • Chondritic ratio: R(Th/U) AB= mTh /mU= 3,9 • There are no any U, Th, K in Lower mantle and Core • BSE introduced the problem: The calculated radiogenic heat 20 TW is not enough to explain the experimentally measured one 47TW

  7. Global map of the flow of heat, in mWm-2, from Earth's interior to the surface.Higher heat flows are observed at the locations of mid-ocean ridges, and oceanic crust has relatively higher heat flows than continental crust.

  8. The asteroid belt (shown in white) is located between the orbits of Mars and Jupiter.

  9. Hydridic Earth (HE)( primordially Hydrogen-Rich Planet) • Basic idea: Planet chemical composition depends on distance from the Sun. Earth chemical composition ≠ Asteroid Belt (AB) chemical composition.

  10. Hydridic Earth (HE) • R(Th/U) AB = mTh /mU= 1.7 Leonid Bezrukov. Geoneutrino and Hydridic Earth model. Preprint INR 1378/2014. arXiv:1308.4163 • There are U, Th, K in Lower mantle and Core • HE model introduced the opposite problem: The calculated radiogenic heat 700 TW is larger than the experimentally measured one 47TW

  11. Predicted overall initial composition of the Earth. Major elements are typed in bold (mass fraction larger than0.1%). Chemical differentiation of planets: a core issue.HerveToulhoat, Valerie Beaumont, ViacheslavZgonnik, Nikolay Larin, Vladimir N. Larin. Aug 2012. 15 pp. e-Print: arXiv:1208.2909 [astro-ph.EP]

  12. First measurements of geoneutrino. • Borexino detector • Kamland detector • Sudbury detector – will be in operation in near future.

  13. Large liquid scintillator detector "Neutrino Physics and Astrophysics“, Valday, Russia, Jan 27 - Feb 2, 2014

  14. Calculated dependence of counting rate of geoneutrino inverse beta decay reactions in 1 kt scintillation detector per year versus energy release in the first flash after neutrino reaction in detector. Blue curve - geoneutrino from U decay, red curve - geoneutrino from Th decay, black curve - calculated background from reactors for Gran-Sasso location

  15. Conclusion • We propose to investigate the Th/U signal ratio from observed geoneutrino energy spectrum. • We obtained that the exposition not less than 25 kt・yearis necessary to distinguish between extreme cases: BSE model and HE model. L.Bezrukov, V.SinevarXiv: 1405.3161v1

  16. Conclusion • Two geoneutrino detectors located in different places (one - on the continent, another – near ocean) can give information about U, Thdistribution into the Earth interior.

  17. Conclusion • We introduce the new problem: where and how the Earth radiogenic heat is lost? • We support the idea that the Earth heat flux can be not stable. • The precision measurements of the heat flux during long period are highly important to investigate the heat flux stability.

  18. 40K decay scheme 40K -, 89.25%, E < 1.311 MeV , 10.55% , E = 0.044 MeV g, E = 1.460 MeV , 0.2%, E = 1.504 MeV 40Ca 40Ar "Neutrino Physics and Astrophysics“, Valday, Russia, Jan 27 - Feb 2, 2014

  19. Antineutrino and neutrino spectra of 40K e 10.55% 0.2% e 89.25% e Energy, MeV "Neutrino Physics and Astrophysics“, Valday, Russia, Jan 27 - Feb 2, 2014

  20. Recoil electrons spectrum from 40К in BOREXINO e + e  e + e "Neutrino Physics and Astrophysics“, Valday, Russia, Jan 27 - Feb 2, 2014

  21. Conclusion • We showed that the effect from 40K geoneutrinos can achieve value of 10% from 7Be solar neutrinos effect • Borexino could estimate the upper limit on the total potassium abundance in the Earth V.Sinev, L.Bezrukov, at al. arXiv: 1405.3140v2 "Neutrino Physics and Astrophysics“, Valday, Russia, Jan 27 - Feb 2, 2014

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