A search for. nu. sub e appearance from stopped. pi. sup + and. mu. sup + decay at LAMPF

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5179334

Fujikawa, B K

The author reports on a recent search for {bar {nu}}{sub e} appearance from stopped {pi}{sup +} {yields} {mu}{sup +}{nu}{sub {mu}} and {mu}{sup +} {yields} e{sup +}{nu}{sub e}{bar {nu}}{sub {mu}} decay made by the LAMPF experiment E645. The appearance of {bar {nu}}{sub e} may occur from {bar {nu}}{sub {mu}} {yields} {bar {nu}}{sub e}, {nu}{sub e} {yields} {bar {nu}}{sub eL}, or {nu}{sub {mu}} {yields} {bar {nu}}{sub eL} oscillations. Appearance may also occur from rare {mu}{sup +} {yields} e{sup +}{bar {nu}}{sub e}{nu}{sub {mu}} decay, which is allowed by a multiplicative lepton charge conservation law. The neutrino energies range from E{sub {nu}} = 0 to 52.8MeV. The neutrino detector, which is located 26.1 meters from the neutrino source, consists of a segmented liquid scintillator and proportional drift tube central detector surrounded by both active and passive shielding. The central detector detects {bar {nu}}{sub e} through the {bar {nu}}{sub e}p {yields} ne{sup +} Charge Current (CC) reaction, which is signaled by the direct detection of the final state positron and neutron. The hydrogen-rich liquid scintillators act as free proton targets for the {bar {nu}}{sub e}p CC reaction. The neutrons are detected through radiative neutron capture on gadolinium. He finds no evidence for {bar {nu}}{sub e} appearance in the first year of running. New limits on the {bar {nu}}{sub {mu}}, {nu}{sub e}, {nu}{sub {mu}} yields {bar {nu}}{sub e} oscillation parameters and the rare {mu}{sup +} {yields} e{sup +}{bar {nu}}{sub e}{nu}{sub {mu}} decay branching ratio are presented.

• Research Organization: California Inst. of Tech., Pasadena, CA (United States)
• OSTI ID: 5179334
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
ANTILEPTONS
ANTIMATTER
ANTINEUTRINOS
ANTIPARTICLES
BASIC INTERACTIONS
BOSONS
BRANCHING RATIO
CHARGED CURRENTS
CURRENTS
DECAY
DETECTION
ELECTRON ANTINEUTRINOS
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
FERMIONS
FINAL-STATE INTERACTIONS
HADRONS
INTERACTIONS
LEPTON NUMBER
LEPTONIC DECAY
LEPTONS
LIMITING VALUES
MASSLESS PARTICLES
MATTER
MESONS
MUONS
NEUTRINO DETECTION
NEUTRINO OSCILLATION
NEUTRINOS
PARTICLE DECAY
PARTICLE PRODUCTION
PIONS
PIONS PLUS
PSEUDOSCALAR MESONS
RADIATION DETECTION
WEAK INTERACTIONS
WEAK PARTICLE DECAY