Aspects of pion and muon capture

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:7002654

Caffrey, A J

This dissertation reviews particle, nuclear, and atomic physics aspects of negative pion and muon capture, as illustrated by experiment. Atomic-capture of negative pions was studied in an high precision pionic x-ray measurement. The charged-pion mass was determined to seven parts-per-million uncertainty; and the pionic x-ray fine-structure predicted by the Klein-Gordan equation was observed. This experiment also established an upper limit on the muon neutrino mass of 570 keV at the 90% confidence level. Particle-physics aspects have been investigated in the pion-like process of nuclear muon capture on the deuteron. By selecting back-to-back neutron events where little momentum is carried by the muon neutrino, it was possible to observe the enhancement to the neutron energy spectrum predicted by meson-exchange current corrections to the muon capture-reaction calculations. Nuclear reactions following stopped negative pion capture in {sup 165}Ho and {sup 181}Ta have been investigated by coincidence measurements of gamma rays and neutrons emitted by the reaction products. The observed neutron spectra are compared to spectra calculated by a hybrid exciton model calculation of pre-equilibrium neutron emission. The model was modified to include the kinematics of pion capture on a pair of correlated nucleons.

• Research Organization: Johns Hopkins Univ., Baltimore, MD (USA)
• OSTI ID: 7002654
• Country of Publication: United States
• Language: English

Related Subjects

645000* -- High Energy Physics
645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
651100 -- Nuclear Physics-- Experimental Techniques-- (1980-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BOSONS
CALCULATION METHODS
COINCIDENCE METHODS
COUNTING TECHNIQUES
DATA
DATA ANALYSIS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
FINE STRUCTURE
HADRONS
HEAVY NUCLEI
HIGH ENERGY PHYSICS
HOLMIUM 165
HOLMIUM ISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
LEPTONS
MEASURING INSTRUMENTS
MEASURING METHODS
MESONS
MUONS
NUCLEAR PHYSICS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
PHYSICS
PIONS
PSEUDOSCALAR MESONS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SPECTROSCOPY
STABLE ISOTOPES
TANTALUM 181
TANTALUM ISOTOPES
X-RAY SPECTROSCOPY