A BETA-RAY SPECTROMETER FOR CONVERSION ELECTRON STUDIES.
Abstract
A double-focusing, magnetic beta-ray spectrometer was assembled, calibrated, and used to find conversion electrons in light (Z < 20) nuclei. A 2 MeV Van de Graaff accelerator was connected to the spectrometer via drift tubes. Various beam handling and monitoring devices were designed and constructed; included were a magnetic quadrupole focusing lens, beam deflecting magnets, target chamber, and Faraday Cup. The spectrometer's field was measured with a rotating coil magnetometer, and a solid state detection system was used. The spectrometer was calibrated with Cs-137 and Bi-207 sources and was found to be linear to within 6 parts in 10,000; the resolution of the 624 keV transition in Ba-137 was 0.24%. A water cooled, CaF2 target was bombarded with 873 keV protons, and conversion electrons corresponding to the transition from the second excited state to ground state in F-19 were measured. The second excited state in F-19 was found to be 198.6 = 0.4 keV above the ground state. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1965
- Accession Number
- AD0616691
Entities
People
- Charles Delu David Jr.
Organizations
- Air Force Institute of Technology