LSND neutrino oscillation results

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The LSND (Liquid Scintillator Neutrino Detector) experiment at Los Alamos has conducted a search for muon antineutrino {r_arrow} electron antineutrino oscillations using muon neutrinos from antimuon decay at rest. The electron antineutrinos are detected via the reaction electron antineutrino + proton {r_arrow} positron + neutron, correlated with the 2.2-MeV gamma from neutron + proton {r_arrow} deuteron + gamma. The use of tight cuts to identify positron events with correlated gamma rays yields 22 events with positron energy between 36 and 60 MeV and only 4.6 {+-} 0.6 background events. The probability that this excess is due entirely to a statistical ... continued below

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9 p.

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Louis, W.C. & Collaboration, LSND October 1, 1996.

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Description

The LSND (Liquid Scintillator Neutrino Detector) experiment at Los Alamos has conducted a search for muon antineutrino {r_arrow} electron antineutrino oscillations using muon neutrinos from antimuon decay at rest. The electron antineutrinos are detected via the reaction electron antineutrino + proton {r_arrow} positron + neutron, correlated with the 2.2-MeV gamma from neutron + proton {r_arrow} deuteron + gamma. The use of tight cuts to identify positron events with correlated gamma rays yields 22 events with positron energy between 36 and 60 MeV and only 4.6 {+-} 0.6 background events. The probability that this excess is due entirely to a statistical fluctuation is 4.1 {times} 10{sup -8}. A chi-squared fit to the entire positron sample results in a total excess of 51.8 {sup +18.7}{sub -16.9} {+-} 8.0 events with positron energy between 20 and 60 MeV. If attributed to muon antineutrino {r_arrow} electron antineutrino oscillations, this corresponds to an oscillation probability (averaged over the experimental energy and spatial acceptance) of (0.31 {+-} 0.12 {+-} 0.05){percent}. 10 refs., 7 figs., 1 tab.

Physical Description

9 p.

Notes

INIS; OSTI as DE96014935

Source

  • 8. Rencontres de Blois: neutrinos, dark matter and the universe, Blois (France), 8-12 Jun 1996

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  • Other: DE96014935
  • Report No.: LA-UR--96-3094
  • Report No.: CONF-9606284--1
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/392751 | External Link
  • Office of Scientific & Technical Information Report Number: 392751
  • Archival Resource Key: ark:/67531/metadc679673

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  • October 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 29, 2016, 9:36 p.m.

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Louis, W.C. & Collaboration, LSND. LSND neutrino oscillation results, report, October 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc679673/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.