Geo-neutrino results with Borexino

International Conference on Particle Physics and Astrophysics

Roncin, R.^1,2 ; Agostini, M.^3 ; Appel, S.^3 ; Bellini, G.^5 ; Benziger, J.^6 ; Bick, D.^7 ; Bonfini, G.^1 ; Bravo, D.^7 ; Caccianiga, B.^4 ; Calaprice, F.^8 ; Caminata, A.^9 ; Cavalcante, P.^1 ; Chepurnov, A.^10 ; D'Angelo, D.^4 ; Davini, S.^11 ; Derbin, A.^11 ; Noto, L Di^9 ; Drachnev, I.^11 ; Etenko, A.^12 ; Fomenko, K.^13 ; Franco, D.^2 ; Gabriele, F.^1 ; Galbiati, C.^8 ; Ghiano, C.^9 ; Giammarchi, M.^4 ; Goeger-Neff, M.^3 ; Goretti, A.^8 ; Gromov, M.^10 ; Hagner, C.^6 ; Hungerford, E.^14 ; Ianni, Aldo^1 ; Ianni, Andrea^8 ; Jedrzejczak, K.^15 ; Kaiser, M.^6 ; Kobychev, V.^16 ; Korablev, D.^14 ; Korga, G.^1 ; Kryn, D.^2 ; Laubenstein, M.^1 ; Lehnert, B.^17 ; Litvinovich, E.^12,18 ; Lombardi, F.^1 ; Lombardi, P.^4 ; Ludhova, L.^4 ; Lukyanchenko, G.^12,18 ; Machulin, I.^12,18 ; Manecki, S.^7 ; Maneschg, W.^19 ; Marcocci, S.^11 ; Meroni, E.^4 ; Meyer, M.^6 ; Miramonti, L.^4 ; Misiaszek, M.^1,16 ; Montuschi, M.^20 ; Mosteiro, P.^8 ; Muratova, V.^11 ; Neumair, B.^3 ; Oberauer, L.^3 ; Obolensky, M.^2 ; Ortica, F.^21 ; Pallavicini, M.^9 ; Papp, L.^3 ; Perasso, L.^9 ; Pocar, A.^22 ; Ranucci, G.^4 ; Razeto, A.^1 ; Re, A.^4 ; Romani, A.^21 ; Rossi, N.^1 ; Schönert, S.^3 ; Semenov, D.^11 ; Simgen, H.^19 ; Skorokhvatov, M.^12,18 ; Smirnov, O.^13 ; Sotnikov, A.^13 ; Sukhotin, S.^12 ; Suvorov, Y.^12,23 ; Tartaglia, R.^1 ; Testera, G.^9 ; Thurn, J.^17 ; Toropova, M.^12 ; Unzhakov, E.^11 ; Vishneva, A.^13 ; Vogelaar, R.B.^7 ; Von Feilitzsch, F.^3 ; Wang, H.^23 ; Weinz, S.^21 ; Winter, J.^24 ; Wojcik, M.^17 ; Wurm, M.^24 ; Yokley, Z.^7 ; Zaimidoroga, O.^14 ; Zavatarelli, S.^9 ; Zuber, K.^17 ; Zuzel, G.^15

INFN Laboratori Nazionali Del Gran Sasso, Assergi (AQ)

67010, Italy^1

AstroParticule et Cosmologie, Universite Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cite, Paris, Cedex

75205, France^2

Physik-Department and Excellence Cluster Universe, Technische Universitat Miinchen, Garching

85748, Germany^3

Dipartimento di Fisica, Universita degli Studi e INFN, Milano

20133, Italy^4

Chemical Engineering Department, Princeton University, Princeton

NJ

08544, United States^5

Institut fur Experimentalphysik, Universitat, Hamburg

22761, Germany^6

Physics Department, Virginia Polytechnic Institute, State University, Blacksburg

VA

24061, United States^7

Physics Department, Princeton University, Princeton

NJ

08544, United States^8

Dipartimento di Fisica, Universita degli Studi e INFN, Genova

16146, Italy

(10) Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow

119234, Russia

(11) Gran Sasso Science Institute (INFN), L'AQUILA

67100, Italy

(12) NRC Kurchatov Institute, Moscow

123182, Russia

(13) Joint Institute for Nuclear Research, Dubna

141980, Russia

(14) Department of Physics, University of Houston, Houston

TX

77204, United States

(15) M. Smoluchowski Institute of Physics, Jagiellonian University, Krakow

30059, Poland

(16) Kiev Institute for Nuclear Research, Kiev

06380, Ukraine

(17) Department of Physics, Technische Universität Dresden, Dresden

01062, Germany

(18) National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe highway 31, Moscow

115409, Russia

(19) Max-Planck-Institut fur Kernphysik, Heidelberg

69117, Germany

(20) Dipartimento di Fisica e Scienze della Terra Universitádegli Studi di Ferrara e INFN, Via Saragat 1-44122, Ferrara, Italy

(21) Dipartimento di Chimica, Universita e INFN, Perugia

06123, Italy

(22) Amherst Center for Fundamental Interactions, Physics Department, University of Massachusetts, Amherst

MA

01003, United States

(23) Physics and Astronomy Department, University of California Los Angeles (UCLA), Los Angeles

CA

90095, United States

(24) Institute of Physics and Excellence Cluster PRISMA, Johannes Gutenberg-Universität Mainz, Mainz

55099, Germany^9

关键词: Electron antineutrinos;    Geo-neutrinos;    Geosciences;    Interdisciplinary fields;    Liquid scintillator detectors;    Low background;    Radiogenic heat production;    Solar neutrino;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/675/1/012029/pdf
DOI  :  10.1088/1742-6596/675/1/012029

来源: IOP

【 摘 要 】

Borexino is a liquid scintillator detector primary designed to observe solar neutrinos. Due to its low background level as well as its position in a nuclear free country, Italy, Borexino is also sensitive to geo-neutrinos. Borexino is leading this interdisciplinary field of neutrino geoscience by studying electron antineutrinos which are emitted from the decay of radioactive isotopes present in the crust and the mantle of the Earth. With 2056 days of data taken between December 2007 and March 2015, Borexino observed 77 antineutrino candidates. If we assume a chondritic Th/U mass ratio of 3.9, the number of geo-neutrino events is found to be 23.7+6.5-5.7(stat)+0.9-0.6(syst). With this measurement, Borexino alone is able to reject the null geo-neutrino signal at 5.9σ, to claim a geo-neutrino signal from the mantle at 98% C.L. and to restrict the radiogenic heat production for U and Th between 23 and 36 TW.