A search for neutrino oscillations in the appearance mode νν→νe was performed using the in-flight pion-decay neutrino source at the LAMPF accelerator. An all-active scintillator detector was exposed to a muon-neutrino beam produced by five Coulombs of 800 MeV protons on target. Oscillations events would have appeared as high-energy electrons from the reaction νe+C→e-+X. We also measured charged-current muons events in the detector to normalize our results. Our data show no evidence for neutrino oscillations and we place 90% CL upper limits on sin2(2φ) < 0.008 at Δm2 = 11 eV2, and Δm2 < 0.67 eV2 for complete mixing.
Bibliographical noteFunding Information:
We wish to acknowledgteh e supporto f L. Rosen, J. Browne and G.J. Stephensotnh roughoutth e con-structiona ndr unningo f the experimenWt. e wish to thank the LAMPF and WNR crews who helped us run the beam and to the numerouss ummers tudents who contributedsi gnificantlyto bringing the experiment on-line. This work was supportedb y the US Departmento f Energy, and one of us (G.V.D.) acknowledgessu pportr eceivedt hroughthe University of California.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics