New limits on nucleon decays into invisible channels with the BOREXINO counting test facility

H. O. Back, M. Balata, A. de Bari, T. Beau, 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, V. Y. Denisov, A. Derbin, M. DeutschF. 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, G. Heusser, A. Ianni, A. M. Ianni, H. de Kerret, J. Kiko, T. Kirsten, V. Kobychev, G. Korga, G. Korschinek, Y. Kozlov, D. Kryn, M. Laubenstein, E. Litvinovich, C. Lendvai, 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, P. Musico, L. Niedermeier, L. Oberauer, M. Obolensky, F. Ortica, M. Pallavicini, L. Papp, L. Perasso, A. Pocar, O. A. Ponkratenko, 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, V. I. Tretyak, D. Vignaud, R. B. Vogelaar, V. Vyrodov, M. Wojcik, O. Zaimidoroga, Y. G. Zdesenko, G. Zuzel

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The results of background measurements with the second version of the BOREXINO Counting Test Facility (CTF-II), installed in the Gran Sasso Underground Laboratory, were used to obtain limits on the instability of nucleons, bounded in nuclei, for decays into invisible channels (inv): disappearance, decays to neutrinos, etc. The approach consisted of a search for decays of unstable nuclides resulting from N and N N decays of parent 12C, 13C and 16O nuclei in the liquid scintillator and the water shield of the CTF. Due to the extremely low background and the large mass (4.2 t) of the CTF detector, the most stringent (or competitive) up-to-date experimental bounds have been established: τ(n → inv) > 1.8 × 1025 yr, τ(p → inv) > 1.1 × 1026 yr, τ(nn → inv) > 4.9 × 1025 yr and τ(pp → inv) > 5.0 × 1025 yr, all at 90% C.L.

Original languageEnglish
Pages (from-to)23-34
Number of pages12
JournalPhysics Letters B
Issue number1-2
StatePublished - 19 Jun 2003


  • Baryon number conservation
  • Proton decay
  • Scintillation detector


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