000889173 001__ 889173
000889173 005__ 20211209142052.0
000889173 0247_ $$2doi$$a10.1016/j.astropartphys.2020.102509
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000889173 0247_ $$2ISSN$$a1873-2852
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000889173 1001_ $$0P:(DE-HGF)0$$aAgostini, M.$$b0
000889173 245__ $$aSearch for low-energy neutrinos from astrophysical sources with Borexino
000889173 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2021
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000889173 520__ $$aWe 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.
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000889173 7001_ $$0P:(DE-HGF)0$$aAltenmüller, K.$$b1
000889173 7001_ $$0P:(DE-HGF)0$$aAppel, S.$$b2
000889173 7001_ $$0P:(DE-HGF)0$$aAtroshchenko, V.$$b3
000889173 7001_ $$0P:(DE-Juel1)156420$$aBagdasarian, Z.$$b4$$ufzj
000889173 7001_ $$0P:(DE-HGF)0$$aBasilico, D.$$b5
000889173 7001_ $$0P:(DE-HGF)0$$aBellini, G.$$b6
000889173 7001_ $$0P:(DE-HGF)0$$aBenziger, J.$$b7
000889173 7001_ $$0P:(DE-HGF)0$$aBick, D.$$b8
000889173 7001_ $$0P:(DE-HGF)0$$aBonfini, G.$$b9
000889173 7001_ $$0P:(DE-HGF)0$$aBravo, D.$$b10
000889173 7001_ $$0P:(DE-HGF)0$$aCaccianiga, B.$$b11
000889173 7001_ $$0P:(DE-HGF)0$$aCalaprice, F.$$b12
000889173 7001_ $$0P:(DE-HGF)0$$aCaminata, A.$$b13
000889173 7001_ $$0P:(DE-HGF)0$$aCappelli, L.$$b14
000889173 7001_ $$0P:(DE-HGF)0$$aCavalcante, P.$$b15
000889173 7001_ $$0P:(DE-HGF)0$$aCavanna, F.$$b16
000889173 7001_ $$0P:(DE-HGF)0$$aChepurnov, A.$$b17
000889173 7001_ $$0P:(DE-HGF)0$$aChoi, K.$$b18
000889173 7001_ $$0P:(DE-HGF)0$$aD’Angelo, D.$$b19
000889173 7001_ $$0P:(DE-HGF)0$$aDavini, S.$$b20
000889173 7001_ $$0P:(DE-HGF)0$$aDerbin, A.$$b21
000889173 7001_ $$0P:(DE-HGF)0$$aDi Giacinto, A.$$b22
000889173 7001_ $$0P:(DE-HGF)0$$aDi Marcello, V.$$b23
000889173 7001_ $$0P:(DE-HGF)0$$aDing, X. F.$$b24
000889173 7001_ $$0P:(DE-HGF)0$$aDi Ludovico, A.$$b25
000889173 7001_ $$0P:(DE-HGF)0$$aDi Noto, L.$$b26
000889173 7001_ $$0P:(DE-HGF)0$$aDrachnev, I.$$b27
000889173 7001_ $$0P:(DE-HGF)0$$aFormozov, A.$$b28
000889173 7001_ $$0P:(DE-HGF)0$$aFranco, D.$$b29
000889173 7001_ $$0P:(DE-HGF)0$$aGabriele, F.$$b30
000889173 7001_ $$0P:(DE-HGF)0$$aGalbiati, C.$$b31
000889173 7001_ $$0P:(DE-HGF)0$$aGschwender, M.$$b32
000889173 7001_ $$0P:(DE-HGF)0$$aGhiano, C.$$b33
000889173 7001_ $$0P:(DE-HGF)0$$aGiammarchi, M.$$b34
000889173 7001_ $$0P:(DE-HGF)0$$aGoretti, A.$$b35
000889173 7001_ $$0P:(DE-HGF)0$$aGromov, M.$$b36
000889173 7001_ $$0P:(DE-HGF)0$$aGuffanti, D.$$b37
000889173 7001_ $$0P:(DE-HGF)0$$aHagner, C.$$b38
000889173 7001_ $$0P:(DE-HGF)0$$aHungerford, E.$$b39
000889173 7001_ $$0P:(DE-HGF)0$$aIanni, Aldo$$b40
000889173 7001_ $$0P:(DE-HGF)0$$aIanni, Andrea$$b41
000889173 7001_ $$0P:(DE-HGF)0$$aJany, A.$$b42
000889173 7001_ $$0P:(DE-HGF)0$$aJeschke, D.$$b43
000889173 7001_ $$0P:(DE-Juel1)173900$$aKumaran, Sindhujha$$b44
000889173 7001_ $$0P:(DE-HGF)0$$aKobychev, V.$$b45
000889173 7001_ $$0P:(DE-HGF)0$$aKorga, G.$$b46
000889173 7001_ $$0P:(DE-HGF)0$$aLachenmaier, T.$$b47
000889173 7001_ $$0P:(DE-HGF)0$$aLaubenstein, M.$$b48
000889173 7001_ $$0P:(DE-HGF)0$$aLitvinovich, E.$$b49
000889173 7001_ $$0P:(DE-HGF)0$$aLombardi, P.$$b50
000889173 7001_ $$0P:(DE-HGF)0$$aLomskaya, I.$$b51
000889173 7001_ $$0P:(DE-Juel1)168122$$aLudhova, Livia$$b52
000889173 7001_ $$0P:(DE-HGF)0$$aLukyanchenko, G.$$b53
000889173 7001_ $$0P:(DE-HGF)0$$aLukyanchenko, L.$$b54
000889173 7001_ $$0P:(DE-HGF)0$$aMachulin, I.$$b55
000889173 7001_ $$0P:(DE-HGF)0$$aManuzio, G.$$b56
000889173 7001_ $$0P:(DE-HGF)0$$aMarcocci, S.$$b57
000889173 7001_ $$0P:(DE-HGF)0$$aMaricic, J.$$b58
000889173 7001_ $$0P:(DE-HGF)0$$aMartyn, J.$$b59
000889173 7001_ $$0P:(DE-HGF)0$$aMeroni, E.$$b60
000889173 7001_ $$0P:(DE-HGF)0$$aMeyer, M.$$b61
000889173 7001_ $$0P:(DE-HGF)0$$aMiramonti, L.$$b62
000889173 7001_ $$0P:(DE-HGF)0$$aMisiaszek, M.$$b63
000889173 7001_ $$0P:(DE-HGF)0$$aMuratova, V.$$b64
000889173 7001_ $$0P:(DE-HGF)0$$aNeumair, B.$$b65
000889173 7001_ $$0P:(DE-HGF)0$$aNieslony, M.$$b66
000889173 7001_ $$0P:(DE-HGF)0$$aOberauer, L.$$b67
000889173 7001_ $$0P:(DE-HGF)0$$aOrekhov, V.$$b68
000889173 7001_ $$0P:(DE-HGF)0$$aOrtica, F.$$b69
000889173 7001_ $$0P:(DE-HGF)0$$aPallavicini, M.$$b70
000889173 7001_ $$0P:(DE-HGF)0$$aPapp, L.$$b71
000889173 7001_ $$0P:(DE-Juel1)171602$$aPenek, Ö.$$b72$$ufzj
000889173 7001_ $$0P:(DE-HGF)0$$aPietrofaccia, L.$$b73
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000889173 7001_ $$0P:(DE-HGF)0$$aRaikov, G.$$b76
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000889173 7001_ $$0P:(DE-HGF)0$$aRazeto, A.$$b79
000889173 7001_ $$0P:(DE-HGF)0$$aRe, A.$$b80
000889173 7001_ $$0P:(DE-Juel1)171322$$aRedchuk, Mariia$$b81
000889173 7001_ $$0P:(DE-HGF)0$$aRicci, B.$$b82
000889173 7001_ $$0P:(DE-HGF)0$$aRomani, A.$$b83
000889173 7001_ $$0P:(DE-HGF)0$$aRossi, N.$$b84
000889173 7001_ $$0P:(DE-HGF)0$$aRottenanger, S.$$b85
000889173 7001_ $$0P:(DE-HGF)0$$aSchönert, S.$$b86
000889173 7001_ $$0P:(DE-HGF)0$$aSemenov, D.$$b87
000889173 7001_ $$0P:(DE-HGF)0$$aSkorokhvatov, M.$$b88
000889173 7001_ $$0P:(DE-HGF)0$$aSmirnov, O.$$b89
000889173 7001_ $$0P:(DE-HGF)0$$aSotnikov, A.$$b90
000889173 7001_ $$0P:(DE-HGF)0$$aSuvorov, Y.$$b91
000889173 7001_ $$0P:(DE-HGF)0$$aTartaglia, R.$$b92
000889173 7001_ $$0P:(DE-HGF)0$$aTestera, G.$$b93
000889173 7001_ $$0P:(DE-HGF)0$$aThurn, J.$$b94
000889173 7001_ $$0P:(DE-HGF)0$$aUnzhakov, E.$$b95
000889173 7001_ $$0P:(DE-HGF)0$$aVishneva, A.$$b96
000889173 7001_ $$0P:(DE-HGF)0$$aVogelaar, R. B.$$b97
000889173 7001_ $$0P:(DE-HGF)0$$avon Feilitzsch, F.$$b98
000889173 7001_ $$0P:(DE-HGF)0$$aWojcik, M.$$b99
000889173 7001_ $$0P:(DE-HGF)0$$aWurm, M.$$b100
000889173 7001_ $$0P:(DE-HGF)0$$aZaimidoroga, O.$$b101
000889173 7001_ $$0P:(DE-HGF)0$$aZavatarelli, S.$$b102$$eCorresponding author
000889173 7001_ $$0P:(DE-HGF)0$$aZuber, K.$$b103
000889173 7001_ $$0P:(DE-HGF)0$$aZuzel, G.$$b104
000889173 773__ $$0PERI:(DE-600)1499883-x$$a10.1016/j.astropartphys.2020.102509$$gVol. 125, p. 102509 -$$p102509$$tAstroparticle physics$$v125$$x0927-6505$$y2021
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