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|Type:||Artigo de periódico|
|Title:||Homestake result, sterile neutrinos, and low energy solar neutrino experiments|
|Author:||de Holanda, PC|
|Abstract:||The Homestake result is about similar to2sigma lower than the Ar-production rate, Q(Ar), predicted by the large mixing angle (LMA) Mikheyev-Smirnov-Wolfenstein solution of the solar neutrino problem. Also there is no apparent upturn of the energy spectrum (Requivalent toN(obs)/N-SSM) at low energies in SNO and Super-Kamiokande. Both these facts can be explained if a light, Deltam(01)(2)similar to(0.2-2)x10(-5) eV(2), sterile neutrino exists which mixes very weakly with active neutrinos: sin(2) 2alphasimilar to(10(-5)-10(-3)). We perform both the analytical and numerical study of the conversion effects in the system of two active neutrinos with the LMA parameters and one weakly mixed sterile neutrino. The presence of sterile neutrino leads to a dip in the survival probability in the intermediate energy range E=(0.5-5) MeV thus suppressing the Be, or/and pep, CNO, as well as B electron neutrino fluxes. Apart from diminishing Q(Ar) it leads to decrease of the Ge-production rate and may lead to the decrease of the BOREXINO signal as well as the CC/NC ratio at SNO. Future studies of the solar neutrinos by SNO, SK, BOREXINO, and KamLAND as well as by the new low energy experiments will allow us to check this possibility.|
|Editor:||American Physical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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