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| VOLUME 78 (2003) | ISSUE 5 | PAGE 707 |
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New experimental limits on heavy neutrino mixing in 8B-decay obtained with the Borexino Counting Test Facility
H. O. Backa, M. Balatab, A. de Baric, T. Beaud, A. de Bellefond, G. Bellinie 1), J. Benzigerf, S. Bonettie, C. Buckg, B. Caccianigae, L. Cadonatif, F. Calapricef, G. Cecchetc, M. Chenh, A. Di Credicob 4), O. Dadound 7), D. D'Angeloi 4), A. Derbinj 6) 11), M. Deutschk 10), F. Eliseil, A. Etenkom, F. von Feilitzschi, R. Fernholzf, R. Fordf 3), D. Francoe, B. Freudigerg 4) 7), C. Galbiatif 4), F. Gattin, S. Gazzanab 4), M. G. Giammarchie, D. Giugnie, M. Goeger-Neffi, A. Gorettib 2), C. Griebi, C. Hagnera, E. Hardingf, F.X. Hartmanng, G. Heusserg, A. Iannib 4), A.M. Iannif 4), H. de Kerretd, J. Kikog, T. Kirsteng, V. Kobychevb 8), G. Korgae 9), G. Korschineki, Y. Kozlovm, D. Krynd, J. Lamblind, M. Laubensteinb 5), C. Lendvaii 4) 7), E. Litvinovichm, P. Lombardie 4), I. Machulinm, S. Malvezzie, J. Maneirah, I. Mannoo, D. Manuzion, G. Manuzion, F. Masettil, A. Martemianovm 10), U. Mazzucatol, K. McCartyf, E. Meronie, L. Miramontie, M.E. Monzanie, V. Muratovaj 6), P. Musicon, L. Niedermeieri 4) 7), L. Oberaueri, M. Obolenskyd, F. Ortical, M. Pallavicinin 4), L. Pappe 9), L. Perassoe, A. Pocarf, R.S. Raghavanp, G. Ranuccie 2), A. Razetob, A. Sabelnikove, C. Salvon 3), R. Scardaonie, D. Schimizzif, S. Schoenertg, H. Simgeng, T. Shuttf, M. Skorokhvatovm, O. Smirnovj 12), A. Sonnenscheinf, A. Sotnikovj, S. Sukhotinm, V. Tarasenkovm, R. Tartagliab, G. Testeran, D. Vignaudd, R. B. Vogelaara, V. Vyrodovm, M. Wojcikq, O. Zaimidorogaj, G. Zuzelq
aVirginia Polytechnique Institute and State Univercity Blacksburg, VA 24061-0435 Virginia, USA bL.N.G.S. SS 17 bis Km 18+910, I-67010 Assergi(AQ), Italy cDipartimento di Fisica Nucleare e Teorica Universita` di Pavia, 6 I-27100 Pavia, Italy dLaboratoire de Physique Corpusculaire et Cosmologie, 75231 Paris Cedex 05, France eDipartimento di Fisica Universitàdi Milano, 16 I-20133 Milano, Italy fDept. of Physics, Princeton University, Jadwin Hall, Princeton NJ 08544-0708, USA gMax-Planck-Institut fuer Kernphysik, Postfach 103 980 D-69029, Heidelberg, Germany hDept. of Physics, Queen's University Stirling Hall, Kingston, Ontario K7L 3N6, Canada iTechnische Universitaet Muenchen, E15 D-85747 Garching, Germany jJoint Institute for Nuclear Research, 141980 Dubna, Russia kDept. of Physics Massachusetts Institute of Technology, Cambridge, MA 02139 USA lDipartimento di Chimica Universitàdi Perugia, I-06123 Perugia, Italy mRRC Kurchatov Institute, 123182 Moscow, Russia nDipartimento di Fisica Universitàand I.N.F.N. Genova, 33 I-16146 Genova, Italy oKFKI-RMKI, Konkoly Thege ut 29-33 H-1121 Budapest, Hungary pBell Laboratories, Lucent Technologies, Murray Hill, NJ 07974-2070 USA qM. Smoluchowski Institute of Physics, Jagellonian University, PL-30059 Krakow, Poland PACS: 13.10.+q, 13.35.H, 14.60.S, 26.65, 96.60.J
Abstract
If heavy neutrinos with mass 
are emitted in the decays of 8B in the Sun, then 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
|UeH|2 of a massive neutrino in the range of 1.1 MeV to 12
MeV have been derived ( -10-5).
The obtained limits on the mixing parameter are stronger than
obtained in previous experiments using nuclear reactors and
accelerators.
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