6 research outputs found
Search for modulations of the solar Be-7 flux in the next-generation neutrino observatory LENA
A next-generation liquid-scintillator detector will be able to perform
high-statistics measurements of the solar neutrino flux. In LENA, solar Be-7
neutrinos are expected to cause 1.7x10^4 electron recoil events per day in a
fiducial volume of 35 kilotons. Based on this signal, a search for periodic
modulations on sub-percent level can be conducted, surpassing the sensitivity
of current detectors by at least a factor of 20. The range of accessible
periods reaches from several minutes, corresponding to modulations induced by
helioseismic g-modes, to tens of years, allowing to study long-term changes in
solar fusion rates.Comment: 15 pages, 9 figure
Seasonal modulation of the Be solar neutrino rate in Borexino
We present the evidence for the seasonal modulation of the 7Be neutrino interaction rate with the Borexino detector at the Laboratori Nazionali del Gran Sasso in Italy. The period, amplitude, and phase of the observed time evolution of the signal are consistent with its solar origin, and the absence of an annual modulation is rejected at 99.99% C.L. The data are analyzed using three methods: the analytical fit to event rate, the Lomb-Scargle and the Empirical Mode Decomposition techniques, which all yield results in excellent agreement
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Test of the electron stability with the Borexino detector
Despite the fact that the electric charge conservation law is confirmed by many experiments, search for its possible violation remains a way of searching for physics beyond the Standard Model. Experimental searches for the electric charge non-conservation mainly consider electron decays into neutral particles. The Borexino experiment is an excellent tool for the electron decay search due to the highest radiopurity among all the existing experiments, large detector mass, and good sensitivity at low energies. The process considered in this study is a decay into a photon and a neutrino, for which a new lower limit on the electron lifetime is obtained. This is the best electron lifetime limit up to date, exceeding the previous one obtained at the Borexino prototype at two orders of magnitude
The next-generation liquid-scintillator neutrino observatory LENA
We propose the liquid-scintillator detector LENA (Low Energy Neutrino
Astronomy) as a next-generation neutrino observatory on the scale of 50 kt. The
outstanding successes of the Borexino and KamLAND experiments demonstrate the
large potential of liquid-scintillator detectors in low-energy neutrino
physics. LENA's physics objectives comprise the observation of astrophysical
and terrestrial neutrino sources as well as the investigation of neutrino
oscillations. In the GeV energy range, the search for proton decay and
long-baseline neutrino oscillation experiments complement the low-energy
program. Based on the considerable expertise present in European and
international research groups, the technical design is sufficiently mature to
allow for an early start of detector realization.Comment: Whitepaper for the LENA low-energy neutrino detector, 67 pages, 32
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