J. B. Donahue

THE LIQUID SCINTILLATOR NEUTRINO DETECTOR AND LAMPF NEUTRINO SOURCE

Abstract A search for neutrino oscillations of the type ν μ → ν c has been conducted at the Los Alamos Meson Physics Facility using ν μ from muon decay at rest. Evidence for this transition has been reported previously. This paper discusses in detail the experimental setup, detector operation and neutrino source, including aspects relevant to oscillation searches in the muon decay-at-rest and pion decay in flight channels.

Measurement of the reaction [sup 12]C([nu][sub [mu]],[mu][sup [minus]])[ital X] near threshold

The reaction [sup 12]C([nu][sub [mu]],[mu][sup [minus]])[ital X] has been measured near threshold using a [pi][sup +] decay-in-flight [nu][sub [mu]] beam from the Los Alamos Meson Physics Facility and a massive liquid scintillator neutrino detector (LSND). In the energy region 123.7[lt][ital E][sub [nu]][lt]280 MeV, the measured spectral shape is consistent with that expected from the Fermi-gas model (FGM). However, the measured flux-averaged inclusive cross section [l brace][8.3[plus minus]0.7(stat)[plus minus]1.6(syst)][times]10[sup [minus]40] cm[sup 2][r brace] is more than a factor of 2 lower than that predicted by the Fermi-gas model and by a recent random phase approximation calculation.

Tests of Lorentz violation in ν ¯ μ → ν ¯ e oscillations

A recently developed Standard-Model Extension (SME) formalism for neutrino oscillations that includes Lorentz and CPT violation is used to analyze the sidereal time variation of the neutrino event excess measured by the Liquid Scintillator Neutrino Detector (LSND) experiment. The LSND experiment, performed at Los Alamos National Laboratory, observed an excess, consistent with neutrino oscillations, of

A measurement of the neutrino flux from a stopped-pion source

{\bar\nu}_e

Atomic Physics with Relativistic Beams

in a beam of

Overview of progress on the improvement projects for the LANSCE accelerator and target facilities

{\bar\nu}_\mu

LANSCE short-pulse spallation source target upgrade

. It is determined that the LSND oscillation signal is consistent with no sidereal variation. However, there are several combinations of SME coefficients that describe the LSND data; both with and without sidereal variations. The scale of Lorentz and CPT violation extracted from the LSND data is of order

Spectra from multiphoton electron detachment of H

10^{-19}

Measurement and reduction of momentum spread in the LAMPF linac beam

GeV for the SME coefficients

Limits on ν¯μ→ν¯e oscillations

a_L