Data di Pubblicazione:
2011
Citazione:
Seasonal modulation in the Borexino cosmic muon signal / D. D'Angelo - In: Proceedings of the 32. international cosmic ray conference : Aug. 11-18, 2011
Beijing, China. Volume 4[s.l] : Union of pure and applied physics, 2011. - pp. 26-29 (( Intervento presentato al 32. convegno International cosmic ray conference tenutosi a Beijing, China nel 2011 [10.7529/ICRC2011/V04/0510].
Abstract:
Borexino is an organic liquid scintillator detector located in the underground Gran Sasso National Laboratory
(Italy). It is devoted mainly to the real time spectroscopy of low energy solar neutrinos via the elastic scattering on
electrons in the target mass. The data taking campaign started in 2007 and led to key measurements of 7Be and 8B
solar neutrinos as well as antineutrinos from the earth (geo-neutrinos) and from nuclear power reactors. Borexino is
also a powerful tool for the study of cosmic muons that penetrate the Gran Sasso rock coverage and thereby induced
signals such as neutrons and radioactive isotopes which are today of critical importance for upcoming dark matter and
neutrino physics experiments. Having reached 4y of continuous data taking we analyze here the muon signal and its
possible modulation. The muon flux is measured to be (3.41 ± 0.01)· 10−4m−2s
−1. A modulation of this signal with
a yearly period is observed with an amplitude of (1.29±0.07)% and a phase of (179±6) d, corresponding to June 28th.
Muon rate fluctuations are compared to fluctuations in the atmospheric temperature on a daily base, exploiting the most
complete atmospheric data and models available. The distributions are shown to be positively correlated and the effective
temperature coefficient is measured to be αT = 0.93 ± 0.04. This result is in good agreement with the expectations of
the kaon-inclusive model at the laboratory site and represents an improvement over previous measurements performed at
the same depth.
Tipologia IRIS:
03 - Contributo in volume
Keywords:
Borexino; Cosmic; Modulation; Muon; Seasonal
Elenco autori:
D. D'Angelo
Link alla scheda completa:
Titolo del libro:
Proceedings of the 32. international cosmic ray conference : Aug. 11-18, 2011
Beijing, China. Volume 4
Beijing, China. Volume 4