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Los Alamos Crystal Box experiment: a search for. mu. -->. e. gamma. ,. mu. -->. e. gamma gamma. , and. mu. -->. eee

Conference ·
OSTI ID:6571174
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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 surface muon beam at LAMPF with an average intensity of 300 kHz. A total of > 10/sup 11/ muon decays was 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(Tl) crystals. A layer of scintillation counters in front of the crystals provided timing for electrons and a 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. 400 ps from the scintillators and approx. 1 ns from the crystals. From these values, the eee and e..gamma gamma.. limits are expected to be background free.

Research Organization:
Los Alamos National Lab., NM (USA); Stanford Univ., Palo Alto, CA (USA); Chicago Univ., IL (USA); Temple Univ., Philadelphia, PA (USA)
DOE Contract Number:
W-7405-ENG-36
OSTI ID:
6571174
Report Number(s):
LA-UR-84-2130; CONF-8405193-34; ON: DE84015490
Country of Publication:
United States
Language:
English

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Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BRANCHING RATIO
DECAY
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RESOLUTION
FERMIONS
LAMPF LINAC
LEPTONS
LINEAR ACCELERATORS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MESON FACTORIES
MUONS
PARTICLE DECAY
PHOTONS
RADIATION DETECTORS
RADIATIVE DECAY
RESOLUTION
SCINTILLATION COUNTERS
TIME RESOLUTION
TIMING PROPERTIES
WEAK PARTICLE DECAY