BooNE Has Begun
نویسنده
چکیده
There are now several sources of evidence for neutrino oscillations. There is evidence from solar neutrino experiments, which observe fewer electron neutrinos than would be consistent with the sun’s energy output [1]. In addition, the recent SNO results indicate that there is a nonelectron flavor active neutrino component in the solar flux [2,3]. Evidence also comes from experiments studying neutrinos produced by cosmic rays in the earth’s atmosphere, which find that muon neutrinos entering the detector from below (which had to travel through the earth) are depleted when compared with those incident from above (which traveled a shorter distance) [4]. Finally, there is evidence from a lone accelerator experiment, LSND at Los Alamos, which observed an excess of ν̄e events from a predominantly ν̄μ source [5]. LSND used a beam-stop neutrino source at the 800 MeV LAMPF proton accelerator. The primary source of neutrinos was π and μ decays at rest (DAR) in the target, which yielded νμ, ν̄μ, and νe with energies below 53 MeV. In addition, π and π− decays in flight (DIF) provided a small flux of higher-energy νμ and ν̄μ. The ν̄e flux was below 10 of the total DAR rate. The LSND data were collected between 1993 and 1998. The first data set, collected 1993-1995, used a water target and provided of 59% of the DAR flux; the remainder of the running used a heavy metal tar-
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