THE PRODUCTION OF BE7 AND C11 FROM CARBON, NITROGEN, AND OXYGEN BY 75- MEV ELECTRONS
Abstract
An investigation was made of the electromagnetic disintegration of carbon, nitrogen, and oxygen leading to production of the unstable nuclei Be7 and C-11. Targets of graphite, melamine, and water were bombarded with 75-MeV electrons from the Naval Postgraduate School linear accelerator. The disintegration fragments of interest were counted by detecting their decay activity, Be7 by the 477-Kev gamma ray from its daughter nucleus and C-11 by the 511-Kev photons from the annihilation of its emitted positron. Electron and photon effects were separated by interposing an additional radiator for one bombardment of a given type of target, then repeating with a similar target without the radiator. Radioactive fragments of Be7 and C-11 were found in all bombardments; N13 was also found in bombardments of melamine and water. Electrodisintegration cross sections for processes yielding C-11 were found to range from 17.5 microbarns for carbon down to 0.3 microbarns for oxygen. The corresponding values for processes yielding Be7 ranged from 1.3 microbarns to 0. 14 microbarns. Integrated photodisintegration cross sections were found to be approximately 50 times greater than these.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1967
- Accession Number
- AD0819008
Entities
People
- Glenn W. Pomykal
- James A. Lusk
Organizations
- Naval Postgraduate School