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.
|Original language||English (US)|
|Number of pages||10|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Jan 16 1997|
Bibliographical noteFunding Information:
This work was undertakenw ith the support of the US Departmento f Energy, the Statea nd University of Minnesota and the UK Particle Physics and Astronomy Research Council. We wish to thank the following for their invaluable help with the Soudan 2 experiment: the staffs of the collaborating laboratories; the Minnesota Department of Natural Resources for allowing us to use the facilities of the Soudan Underground Mine State Park; the staff of the Park, particularly Park Managers D. Logan and P. Wannarka, for their day to day support; and Messrs B. Anderson, J. Beaty, G. Benson, D. Carlson, J. Eininger and J. Meier of the Soudan Mine Crew for their work in the installation and running of the experiment.