Journal Article

FZJ-2021-00096

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Search for low-energy neutrinos from astrophysical sources with Borexino

Agostini, M. ; Altenmüller, K. ; Appel, S. ; Atroshchenko, V. ; Bagdasarian, Z.FZJ* ; Basilico, D. ; Bellini, G. ; Benziger, J. ; Bick, D. ; Bonfini, G. ; Bravo, D. ; Caccianiga, B. ; Calaprice, F. ; Caminata, A. ; Cappelli, L. ; Cavalcante, P. ; Cavanna, F. ; Chepurnov, A. ; Choi, K. ; D’Angelo, D. ; Davini, S. ; Derbin, A. ; Di Giacinto, A. ; Di Marcello, V. ; Ding, X. F. ; Di Ludovico, A. ; Di Noto, L. ; Drachnev, I. ; Formozov, A. ; Franco, D. ; Gabriele, F. ; Galbiati, C. ; Gschwender, M. ; Ghiano, C. ; Giammarchi, M. ; Goretti, A. ; Gromov, M. ; Guffanti, D. ; Hagner, C. ; Hungerford, E. ; Ianni, A. ; Ianni, A. ; Jany, A. ; Jeschke, D. ; Kumaran, S.FZJ*RWTH* ; Kobychev, V. ; Korga, G. ; Lachenmaier, T. ; Laubenstein, M. ; Litvinovich, E. ; Lombardi, P. ; Lomskaya, I. ; Ludhova, L.FZJ*RWTH* ; Lukyanchenko, G. ; Lukyanchenko, L. ; Machulin, I. ; Manuzio, G. ; Marcocci, S. ; Maricic, J. ; Martyn, J. ; Meroni, E. ; Meyer, M. ; Miramonti, L. ; Misiaszek, M. ; Muratova, V. ; Neumair, B. ; Nieslony, M. ; Oberauer, L. ; Orekhov, V. ; Ortica, F. ; Pallavicini, M. ; Papp, L. ; Penek, Ö.FZJ* ; Pietrofaccia, L. ; Pilipenko, N. ; Pocar, A. ; Raikov, G. ; Ranalli, M. T. ; Ranucci, G. ; Razeto, A. ; Re, A. ; Redchuk, M.FZJ*RWTH* ; Ricci, B. ; Romani, A. ; Rossi, N. ; Rottenanger, S. ; Schönert, S. ; Semenov, D. ; Skorokhvatov, M. ; Smirnov, O. ; Sotnikov, A. ; Suvorov, Y. ; Tartaglia, R. ; Testera, G. ; Thurn, J. ; Unzhakov, E. ; Vishneva, A. ; Vogelaar, R. B. ; von Feilitzsch, F. ; Wojcik, M. ; Wurm, M. ; Zaimidoroga, O. ; Zavatarelli, S. (Corresponding author) ; Zuber, K. ; Zuzel, G.

2021
Elsevier Science Amsterdam [u.a.]

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/26712  doi:10.1016/j.astropartphys.2020.102509

Abstract: We report on searches for neutrinos and antineutrinos from astrophysical sources performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso in Italy. Electron antineutrinos ($\barν_e$) are detected in an organic liquid scintillator through the inverse β-decay reaction. In the present work we set model-independent upper limits in the energy range 1.8–16.8 MeV on neutrino fluxes from unknown sources that improve our previous results, on average, by a factor 2.5. Using the same data set, we first obtain experimental constraints on the diffuse supernova $\barν_e$ fluxes in the previously unexplored region below 8 MeV. A search for $\barν_e$ in the solar neutrino flux is also presented: the presence of $\barν_e$ would be a manifestation of a non-zero anomalous magnetic moment of the neutrino, making possible its conversion to antineutrinos in the strong magnetic field of the Sun. We obtain a limit for a solar $\barν_e$ flux of 384 cm–2 s–1 (90% C.L.), assuming an undistorted solar $^8B$ neutrinos energy spectrum, that corresponds to a transition probability $p_{ν_e \rightarrow \barν_e}$< 7.2 × 10–5 (90% C.L.) for $E_{\barν_e}$ > 1.8 MeV. At lower energies, by investigating the spectral shape of elastic scattering events, we obtain a new limit on solar $^7Be-ν_e$ conversion into $\barν_e$ of $p_{ν_e \rightarrow \barν_e}$< 0.14 (90% C.L.) at 0.862 MeV. Last, we investigate solar flares as possible neutrino sources and obtain the strongest up-to-date limits on the fluence of neutrinos of all flavor neutrino below 3–7 MeV. Assuming the neutrino flux to be proportional to the flare’s intensity, we exclude an intense solar flare as the cause of the observed excess of events in run 117 of the Cl-Ar Homestake experiment.

Keyword(s): Particle Physics (2nd)

---

Contributing Institute(s):

1. Experimentelle Hadrondynamik (IKP-2)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)

Appears in the scientific report 2021

---

Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---