Measurement of the atmospheric neutrino flavor ratio with the Soudan 2 detector

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7157511

Roback, D M

The Soudan 2 detector is a 930 metric ton iron drift calorimeter designed to search for proton decay and other rare phenomena such as neutrino flavor oscillations. The detector is located 2340 ft underground in an iron mine in Soudan, Minnesota. The detector has been taking useful data since April, 1989 and will be completed in 1993. The first 0.50 fiducial kiloton years has been analyzed for neutrino flavor oscillations, [nu][sub [mu]] [yields] [nu][sub t]. To search for such oscillations, the ratio of final state single prong (with a possible proton recoil) tracks to showers in the data is compared to the expected ratio. This [open quotes]ratio of ratios,[close quotes] R = [([nu][sub [mu]]/[nu][sub e])[sub Data]]/[([nu][sub [mu]]/[nu][sub e])[sub Monte Carlo]] should be unity for no oscillations. For the 42 single prong events detected in the Soudan 2 detector, the ratio of ratios is R = 0.38 [+-] 0.24. This value of R is consistent with other similar experiments but inconsistent with 1 at the 2.5 [sigma] level.

• Research Organization: Minnesota Univ., Minneapolis, MN (United States)
• OSTI ID: 7157511
• Country of Publication: United States
• Language: English

Related Subjects

440104 -- Radiation Instrumentation-- High Energy Physics Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
662310 -- Weak & Electromagnetic Interactions of Leptons-- (1992-)
662430* -- Properties of Leptons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DETECTION
DRIFT CHAMBERS
FIELD THEORIES
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
NEUTRINO DETECTION
NEUTRINO OSCILLATION
PROPORTIONAL COUNTERS
QUANTUM FIELD THEORY
QUANTUM FLAVORDYNAMICS
RADIATION DETECTION
RADIATION DETECTORS