K.C. Wang

Limits on the neutrino magnetic moment from a measurement of neutrino-electron elastic scattering☆

Abstract Upper bounds on the magnetic moments of muon neutrinos and electron neutrinos are inferred from a measurement of neutrino-electron elastic scattering. The limits obained are: μ ν e −10 μ Bohr (90%CL) and μ ν ¬ −10 μ Bohr (90% CL).

A detector system for the study of intermediate energy neutrino interactions

Abstract A 15 t fine-grained neutrino detector and high efficiency anticoincidence system are in operation at the LAMPF beam stop, an intense source of neutrinos with a maximum energy of 53 MeV. The primary use of this equipment is in an experiment which is directed towards the observation and cross section measurement of the ν e e − elastic scattering reaction. The design, operation, and performance of the apparatus is reported.

Search for the exotic decay μ+→e+ν̄eνμ

Abstract We search for the exotic decay μ+→e+ ν eνμ as a test of lepton number conversation. An exposure of ≈1020 μ+ -decay neutrinos to a 15 ton detector leads to a new upper bound for the branching ratio, RϵΓ(μ + →e + ν e ν μ /Γ(μ + →all), R .

Measurement of W‐Z interference from neutrino‐electron scattering

Neutrino‐electron elastic scattering was observed at LAMPF with a 15‐ton fine‐grained tracking calorimeter exposed to electron‐neutrinos from muon decay at rest. The measured νee−→νee− elastic scattering cross section, 10.0±1.5(stat)±0.09(syst)×10−45 cm−2×(Eν(MeV)), gives a model independent measurement of the strength of the destructive interference between the charged and neutral currents, I=−1.07±0.21, that agrees well with the standard model (SM) prediction I=−1.08. The agreement between the measured electroweak parameters and SM expectations is used to place limits on neutrino properties, such as neutrino flavor‐changing neutral currents and neutrino electromagnetic moments, and on the masses of hypothetical new bosons that would interact with leptons.