Publication: Modulations of the cosmic muon signal in ten years of Borexino data
Дата
2019
Авторы
Agostini, M.
Altenmueller, K.
Appel, S.
Atroshchenko, V.
Litvinovich, E.
Machulin, I.
Skorokhvatov, M.
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Volume Title
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Аннотация
We have measured the flux of cosmic muons in the Laboratori Nazionali del Gran Sasso at 3800 m.w.e. to be (3.432 +/- 0.003) center dot 10(-4) m(-2) s(-1) based on ten years of Borexino data acquired between May 2007 and May 2017. A seasonal modulation with a period of (366.3 +/- 0.6) d and a relative amplitude of (1.36 +/- 0.04)% is observed. The phase is measured to be (181.7 +/- 0.4) d, corresponding to a maximum at the 1 st of July. Using data inferred from global atmospheric models, we show the muon flux to be positively correlated with the atmospheric temperature and measure the e ff ective temperature coe ffi cient alpha(T) = 0.90 +/- 0.02. The origin of cosmic muons from pion and kaon decays in the atmosphere allows to interpret the e ff ective temperature coe ffi cient as an indirect measurement of the atmospheric kaon-topion production ratio r(K/pi) = 0.11(-0.07)(+0.11) for primary energies above 18TeV. We find evidence for a long-term modulation of the muon flux with a period of similar to 3000 d and a maximum in June 2012 that is not present in the atmospheric temperature data. A possible correlation between this modulation and the solar activity is investigated. The cosmogenic neutron production rate is found to show a seasonal modulation in phase with the cosmic muon flux but with an increased amplitude of (2.6 +/- 0.4)%.
Описание
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Цитирование
Modulations of the cosmic muon signal in ten years of Borexino data / Agostini, M [et al.] // Journal of Cosmology and Astroparticle Physics. - 2019. - № 2. - 10.1088/1475-7516/2019/02/046
URI
https://www.doi.org/10.1088/1475-7516/2019/02/046
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https://openrepository.mephi.ru/handle/123456789/16608
https://www.scopus.com/record/display.uri?eid=2-s2.0-85062260608&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000459570400001
https://openrepository.mephi.ru/handle/123456789/16608