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VOLUME 78 | ISSUE 5 | PAGE 707
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 Università di 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 Università di Perugia, I-06123 Perugia, Italy
mRRC Kurchatov Institute, 123182 Moscow, Russia
nDipartimento di Fisica Università and 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 m_{\nu_{H}}\geq2 m_e are emitted in the decays of 8B in the Sun, then decays \nu_{H}\rightarrow\nu_{L}+e^++e^- 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 (|U_{eH}|^2\leq 10^{-3}-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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