Precision measurement of the rate of nuclear muon capture in the muonic hydrogen atom and the determination of the pseudoscalar form factor of the nucleon

Journal Article · Thu Jan 15 04:00:00 EST 2009 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778809010153· OSTI ID:21406041

Vorobyov, A A ^[1]

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1. Russian Academy of Sciences, Petersburg Nuclear Physics Institute (Russian Federation)

The rate {Lambda}{sub S} of nuclear muon capture by a proton from the hyperfine singlet ground state of the {mu}p atom has been measured using a new experimental method based on a time-projection chamber operating in an ultrapure hydrogen gas at a pressure of 10 atm. The capture rate has been determined from the difference between the measured lifetime of the negative muon in hydrogen and the world average lifetime of the positive muon. The analysis of 10% of the collected statistics (2 x 10{sup 10}) of {mu}e decays yields the muon capture rate {Lambda}{sub S} = 725.0 {+-} 17.4 s{sup -1}, from which the pseudoscalar form factor of the nucleon, g{sub P}(q{sub c}{sup 2} = -0.88m{sub {mu}}{sup 2}) = 7.3 {+-} 1.1, is determined. The further analysis of the collected experimental data should improve the precision of this measurement by a factor of 3.

• OSTI ID: 21406041
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 1 Vol. 72; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
BARYONS
CAPTURE
DATA
DECAY
DIMENSIONLESS NUMBERS
DRIFT CHAMBERS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
EXPERIMENTAL DATA
FERMIONS
FORM FACTORS
GROUND STATES
HADRONS
HYDROGEN
INFORMATION
LEPTONS
LIFETIME
MATHEMATICS
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
MUONS
NONMETALS
NUCLEONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE PROPERTIES
PROPORTIONAL COUNTERS
PROTONS
PSEUDOSCALARS
RADIATION DETECTORS
STATISTICS
TIME PROJECTION CHAMBERS