If heavy neutrinos with mass mvH >or= 2me are emitted in the decays of 8B in the Sun, then sub H/ rArr nu L + e+ + e- decays should be observed. In the present work, the results of background measurements with the Borexino Counting Test Facility have been used to obtain bounds on the number of these decays. As a result, new limits on the coupling of a massive neutrino in the range of 1.1 MeV to 12 MeV have been derived (|UeH|2 <or= 10-3-10-5). The obtained limits on the mixing parameter are stronger than obtained in previous experiments using nuclear reactors and accelerators.
New experimental limits on heavy neutrino mixing in 8B-decay obtained with the Borexino counting test facility / H. O. Back, M. Belata, A. de Bari, A. de Bellefon, G. Bellini, J. Benziger, S. Bonetti, C. Buck, B. Caccianiga, L. Cadonati, F. Calaprice, G. Cecchet, M. Chen, A. Di Credico, O. Dadoun, D. D'Angelo, A. Derbin, M. Deutsch, F. Elisei, A. Etenko, F. von Feilitzsch, R. Fernholz, R. Ford, D. Franco, B. Freudiger, C. Galbiati, F. Gatti, S. Gazzana, M. G. Giammarchi, D. Giugni, M. Goeger-Neff, A. Goretti, C. Grieb, C. Hagner, E. Harding, F. X. Hartmann, G. Heusser, A. Ianni, A. M. Ianni, H. de Kerret, J. Kiko, T. Kirsten, V. V. Kobychev, G. Korga, G. Korschinek, Y. Kozlov, D. Kryn, J. Lamblin, M. Laubenstein, C. Lendvai, E. Litvinovich, P. Lombardi, I. Machulin, S. Malvezzi, J. Maneira, I. Manno, D. Manuzio, G. Manuzio, F. Masetti, A. Martemianov, U. Mazzucato, K. McCarty, E. Meroni, L. Miramonti, M. E. Monzani, V. Muratova, P. Musico, L. Niedermeier, L. Oberauer, M. Obolensky, F. Ortica, M. Pallavicini, L. Papp, L. Perasso, A. Pocar, R. S. Raghavan, G. Ranucci, A. Razeto, A. Sabelnikov, C. Salvo, R. Scardaoni, D. Schimizzi, S. Schoenert, H. Simgen, T. Shutt, M. Skorokhvatov, O. Smirnov, A. Sonnenschein, A. Sotnikov, S. Sukhotin, V. Tarasenkov, R. Tartaglia, G. Testera, D. Vignaud, R. B. Vogelaar, V. Vyrodov, M. Wojcik, O. Zaimidoroga, G. Zuzel. - In: JETP LETTERS. - ISSN 0021-3640. - 78:5(2003), pp. 261-266.
New experimental limits on heavy neutrino mixing in 8B-decay obtained with the Borexino counting test facility
G. Bellini;S. Bonetti;B. Caccianiga;D. D'Angelo;D. Franco;E. Meroni;L. Miramonti;
2003
Abstract
If heavy neutrinos with mass mvH >or= 2me are emitted in the decays of 8B in the Sun, then sub H/ rArr nu L + e+ + e- decays should be observed. In the present work, the results of background measurements with the Borexino Counting Test Facility have been used to obtain bounds on the number of these decays. As a result, new limits on the coupling of a massive neutrino in the range of 1.1 MeV to 12 MeV have been derived (|UeH|2
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