Measurement of the atmospheric neutrino flavour composition in Soudan 2
W.W.M. Allison, G.J. Alner, D.S. Ayres, W.L. Barrett, C. Bode, P.M., Border, C.B. Brooks, J.H. Cobb, D.J.A. Cockerill, R.J. Cotton, H. Courant,, D.M. DeMuth, T.H. Fields, H.R. Gallagher, C. Garcia-Garcia, M.C. Goodman,, R.N. Gray, K. Johns, T. Kafka, S.M.S. Kasahara, W. Leeson
TL;DR
This paper reports a measurement of the atmospheric neutrino flavor ratio using Soudan 2 data, finding a lower ratio than expected, which supports neutrino oscillation hypotheses.
Contribution
First measurement of atmospheric neutrino flavor ratio in Soudan 2 with detailed background analysis and comparison to Monte Carlo predictions.
Findings
Measured flavor ratio: 0.72 ± 0.19 +0.05 -0.07
Background from neutron and photon interactions does not explain the low ratio
Results support neutrino oscillation phenomena
Abstract
The atmospheric neutrino flavour ratio measured using a 1.52 kton-year exposure of Soudan 2 is found to be 0.72 +- 0.19 +0.05 -0.07 relative to the expected value from a Monte Carlo calculation. The possible background of interactions of neutrons and photons produced in muon interactions in the rock surrounding the detector has been investigated and is shown not to produce low values of the ratio.
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