Search for solar axions emitted in the M1-transition of 7Li* with Borexino CTF

G. Bellini, Jay Burton Benziger, S. Bonetti, B. Caccianiga, Frank Calaprice, F. Dalnoki-Veress, D. D'Angelo, H. De Kerret, A. Derbin, A. Etenko, K. Fomenko, D. Franco, Cristiano Galbiati, S. Gazzana, M. G. Giammarchi, M. Goeger-Neff, A. Goretti, C. Grieb, S. Hardy, A. IanniA. M. Ianni, M. Joyce, V. V. Kobychev, G. Korga, D. Kryn, M. Laubenstein, M. Leung, E. Litvinovich, P. Lombardi, L. Ludhova, I. MacHulin, G. Manuzio, F. Masetti, K. McCarty, E. Meroni, L. Miramonti, M. Misiaszek, D. Montanari, M. E. Monzani, V. Muratova, L. Niedermeier, L. Oberauer, M. Obolensky, F. Ortica, M. Pallavicini, L. Papp, L. Perasso, R. S. Raghavan, G. Ranucci, A. Razeto, A. Sabelnikov, C. Salvo, S. Schönert, H. Simgen, M. Skorokhvatov, O. Smirnov, A. Sotnikov, S. Sukhotin, Y. Suvorov, V. Tarasenkov, R. Tartaglia, G. Testera, D. Vignaud, F. Von Feilitzsch, R. B. Vogelaar, M. Wojcik, O. Zaimidoroga, S. Zavatarelli, G. Zuzel

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Results of background measurements with a prototype of the Borexino detector were used to search for 478∈keV solar axions emitted in the M1-transitions of 7Li*. The Compton conversion of axion to a photon A+e→e+γ, axioelectric effect A+e+Z→e+Z, decay of axion in two photons A→2γ and Primakoff conversion on nuclei A+Z→γ+Z are considered. The upper limit on constants of interaction of axion with electrons, photons and nucleons - gAegAN (1.0-2.4)×10-10 at mA 450∈keV and g gAN 5×10-9∈GeV-1 at mA 10∈keV are obtained (90%c.l.). For heavy axions with mass at 100<mA<400∈keV the limits gAe<(0.7-2.0) ×10-8 and g<10-9-10 -8 are obtained in assumption that gAN depends on m A as for KSVZ axion model. These limits are stronger than obtained in previous laboratory-based experiments using nuclear reactor and artificial radioactive sources.

Original languageEnglish (US)
Pages (from-to)61-72
Number of pages12
JournalEuropean Physical Journal C
Issue number1
StatePublished - Mar 2008

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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