The atmospheric neutrino flavor ratio from a 3.9 fiducial kiloton-year exposure of Soudan 2.

Journal Article · Mon Mar 01 00:00:00 EST 1999 · Phys. Lett. B

DOI:https://doi.org/10.1016/S0370-2693(99)00056-8· OSTI ID:942458

Allison, W W. M.; Alner, G J; Ayres, D S; Barr, G; Barrett, W L; Fields, T H; Goodman, M C; Joffe-Minor, T; Leeson, W; Price, L R; Seidlein, R; Thron, J L; Lab, Rutherford Appleton

We report a measurement of the atmospheric neutrino flavor ratio, R, using a sample of quasi-elastic neutrino interactions occurring in an iron medium. The flavor ratio (tracks/showers) of atmospheric neutrinos in a 3.9 fiducial kiloton-year exposure of Soudan 2 is 0.64{+-}0.11(stat.){+-}0.06(syst.) of that expected. Important aspects of our main analysis have been checked by carrying out two independent, alternative analyses; one is based upon automated scanning, the other uses a multivariate approach for background subtraction. Similar results are found by all three approaches.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 942458
• Report Number(s): ANL-HEP-PR-99-2; PYLBAJ; TRN: US0902997
• Journal Information: Phys. Lett. B, Vol. 449, Issue 1-2 ; Mar. 1999; ISSN 0370-2693
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ATMOSPHERICS
FLAVOR
INTERACTIONS
IRON
NEUTRINOS