TY - JOUR
T1 - Identification of the cosmogenic 11C background in the solar neutrino experiment Borexino
AU - Borexino collaboration
AU - Porcelli, Alessio
AU - Agostini, M.
AU - Altenm, K.
AU - Appel, S.
AU - Atroshchenko, V.
AU - Bagdasarian, Z.
AU - Basilico, D.
AU - Bellini, G.
AU - Benziger, J.
AU - Biondi, R.
AU - Bravo, D.
AU - Caccianiga, B.
AU - Calaprice, F.
AU - Caminata, A.
AU - Cavalcante, P.
AU - Chepurnov, A.
AU - D'Angelo, D.
AU - Davini, S.
AU - Derbin, A.
AU - DiZGiacintio, A.
AU - Di Marcello, V.
AU - Ding, X. F.
AU - Di Ludovico, A.
AU - Di Noto, L.
AU - Drachnev, I.
AU - Formozov, A.
AU - Franco, D.
AU - Galbiati, C.
AU - Ghiano, C.
AU - Giammarchi, M.
AU - Goretti, A.
AU - Göttel, A. S.
AU - Gromov, M.
AU - Guffanti, D.
AU - Ianni, Aldo
AU - Ianni, Andrea
AU - Jany, A.
AU - Jeschke, D.
AU - Kobychev, V.
AU - Korga, G.
AU - Kumaran, S.
AU - Laubenstein, M.
AU - Litvinovich, E.
AU - Lombardi, P.
AU - Lomskaya, I.
AU - Ludhova, L.
AU - Lukyanchenko, G.
AU - Lukyanchenko, L.
AU - Machulin, I.
AU - Martyn, J.
N1 - Publisher Copyright:
© 2022 Institute of Physics Publishing. All rights reserved.
PY - 2022/2/21
Y1 - 2022/2/21
N2 - Borexino is a liquid scintillator detector situated underground in the Laboratori Nazionali del Gran Sasso in Italy. Its physics program evolves around the study of solar and geo-neutrinos. By now, Borexino has measured neutrinos from the fusion processes in the pp chain and CNO cycle. Especially for the detection of pep and CNO neutrinos, an important background is formed by the cosmogenic radio-isotope 11C that is produced by muon spallation of 12C nuclei in the scintillator. Given the comparatively long life time (30 mins) and high rate (30 cpd and 100 ton), dedicated veto strategies had to be developed to permit the detection of pep and CNO neutrinos. The present contribution presents two veto methods. One is the well-established Three-Fold Coincidence (TFC) technique that relies on time and space correlation of muons, spallation neutrons, and radioactive 11C decays; it has been used in different implementations in all former Borexino analyses. In addition, a newly devised algorithm searching for time-correlated bursts of 11C events will be presented, highlighting as well the potential gain from a combined application with the TFC technique.
AB - Borexino is a liquid scintillator detector situated underground in the Laboratori Nazionali del Gran Sasso in Italy. Its physics program evolves around the study of solar and geo-neutrinos. By now, Borexino has measured neutrinos from the fusion processes in the pp chain and CNO cycle. Especially for the detection of pep and CNO neutrinos, an important background is formed by the cosmogenic radio-isotope 11C that is produced by muon spallation of 12C nuclei in the scintillator. Given the comparatively long life time (30 mins) and high rate (30 cpd and 100 ton), dedicated veto strategies had to be developed to permit the detection of pep and CNO neutrinos. The present contribution presents two veto methods. One is the well-established Three-Fold Coincidence (TFC) technique that relies on time and space correlation of muons, spallation neutrons, and radioactive 11C decays; it has been used in different implementations in all former Borexino analyses. In addition, a newly devised algorithm searching for time-correlated bursts of 11C events will be presented, highlighting as well the potential gain from a combined application with the TFC technique.
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U2 - 10.1088/1742-6596/2156/1/012205
DO - 10.1088/1742-6596/2156/1/012205
M3 - Conference article
AN - SCOPUS:85131855406
SN - 1742-6588
VL - 2156
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012205
T2 - 17th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2021
Y2 - 26 August 2021 through 3 September 2021
ER -