A tracking rangefinder for muons from kaon decay

Conference · Fri Jan 01 00:00:00 EST 1988

DOI:https://doi.org/10.1109/23.34406· OSTI ID:6705205

Frank, J; Hart, G W; Kinnison, W W; Lee, D M; McKee, R J; Milner, E C; Sanders, G H; Ziock, H J; Chapman, M; Eckhouse, M

A muon rangefinder with tracking capabilities has been constructed as part of a search for the rare decay K/degree//sub L/ ..-->.. ..mu..e in experiment 791 at the Brookhaven National Laboratory Alternating Gradient Synchrotron. The rangefinder consisted of two identical arms, symmetric about the beamline, and was the final detector element in a spectrometer system. Each side of the rangefinder was comprised of 75 slabs of marble and 25 slabs of aluminum, each 7.62 cm thick, covering an acceptance area 225 cm wide by 301 cm high, with a total mass of 160 tons (145,454 kg). There were 13 pairs of x- and y-measuring proportional tube planes providing a nominal +-10% accuracy measurement of muon momentum. Altogether, there were 11,648 sense wires, operating at 2650 V, with equal parts argon (49.2%) and ethane (49.2%) gas, and a small amount (1.6% of the total gas) of ethyl alcohol flowing in the proportional tubes. During 850 hours of data collection, efficiency averaged 94% with 160-ns drift time at 1.5 ..mu..A threshold. For well-identified muon tracks, rangefinder muon identification was 99% efficient when penetration to at least 60% of the depth expected from spectrometer-derived momentum was required. 6 refs., 6 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6705205
• Report Number(s): LA-UR-88-3733; CONF-881103-15; ON: DE89003480
• Resource Relation: Journal Volume: 36; Journal Issue: 1; Conference: IEEE nuclear science symposium, Orlando, FL, USA, 9 Nov 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
PARTICLE TRACKS
MUON DETECTION
BROOKHAVEN AGS
KAONS
MULTIWIRE PROPORTIONAL CHAMBERS
MUONS
PARTICLE DECAY
ACCELERATORS
BOSONS
CHARGED PARTICLE DETECTION
CYCLIC ACCELERATORS
DECAY
DETECTION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
LEPTONS
MEASURING INSTRUMENTS
MESONS
PROPORTIONAL COUNTERS
PSEUDOSCALAR MESONS
RADIATION DETECTION
RADIATION DETECTORS
STRANGE MESONS
STRANGE PARTICLES
SYNCHROTRONS
440104* - Radiation Instrumentation- High Energy Physics Instrumentation