Progress report on recent rare muon decay experiments at the Los Alamos Meson Physics Facility

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A search has been performed for the decays ..mu.. ..-->.. eee, ..mu.. ..-->.. e..gamma.., and ..mu.. ..-->.. e..gamma gamma.. with a sensitivity in the branching ratios at the level of 10/sup -10/. The experiment used a separated, 26 MeV/c ..mu../sup +/ beam with an average intensity of 300kHz. A total of 2.2 x 10/sup 11/ muon decays were examined for the present result. The detector for the experiment is the Crystal Box, which consists of a cylindrical drift chamber surrounded by 396 NaI(T1) crystals. A layer of scintillation counters in front of the crystals provided timing for electrons and veto ... continued below

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Pages: 11

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Hogan, G.E.; Bolton, R.D.; Bowman, J.D.; Carlini, R.; Cooper, M.D.; Duong-van, M. et al. January 1, 1984.

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A search has been performed for the decays ..mu.. ..-->.. eee, ..mu.. ..-->.. e..gamma.., and ..mu.. ..-->.. e..gamma gamma.. with a sensitivity in the branching ratios at the level of 10/sup -10/. The experiment used a separated, 26 MeV/c ..mu../sup +/ beam with an average intensity of 300kHz. A total of 2.2 x 10/sup 11/ muon decays were examined for the present result. The detector for the experiment is the Crystal Box, which consists of a cylindrical drift chamber surrounded by 396 NaI(T1) crystals. A layer of scintillation counters in front of the crystals provided timing for electrons and veto for photons. The energy resolution for electrons and photons is approx. 6% (FWHM). The position resolution of the drift chamber is 350 ..mu..m leading to a vertex cut with a rejection of 10/sup 3/ for ..mu.. ..-->.. eee. The timing resolution is approx. 300 ps the scintillators and approx. 1 ns from the crystals. No candidate for ..mu.. ..-->.. eee has been found, yielding an upper limit for the branching ratio of B/sub ..mu..3e/ < 1.3 x 10/sup -10/ (90% C.L.). 21 references.

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Pages: 11

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NTIS, PC A02/MF A01; 1.

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  • International conference on particles and nuclei, Heidelberg, F.R. Germany, 30 Jul 1984

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  • Other: DE85001503
  • Report No.: LA-UR-84-2411
  • Report No.: COO-3539-27
  • Report No.: CONF-840789-4
  • Grant Number: W-7405-ENG-36
  • Grant Number: AC02-76ER03539
  • Office of Scientific & Technical Information Report Number: 6304484
  • Archival Resource Key: ark:/67531/metadc1114550

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  • January 1, 1984

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  • Feb. 22, 2018, 7:45 p.m.

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  • March 15, 2018, 4:59 p.m.

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Hogan, G.E.; Bolton, R.D.; Bowman, J.D.; Carlini, R.; Cooper, M.D.; Duong-van, M. et al. Progress report on recent rare muon decay experiments at the Los Alamos Meson Physics Facility, article, January 1, 1984; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1114550/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.