The production of Be(7), C(11), N(13), or O(15) from carbon, nitrogen and oxygen by 87-mev electrons.

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Author
Higgins, Robert Martin
Date
1969Advisor
Dahl, Harvey A.
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Show full item recordAbstract
Targets of graphite, melamine and water were bombarded with 87-
MeV electrons from the Naval Postgraduate School linear accelerator in order to investigate the production of the unstable nuclei Be(7) ,
C(11) , N(13) , or O(15) from the electromagnetic disintegration of carbon, nitrogen and oxygen. The Be(7) fragments were detected by observing the 477-KeV gamma ray from the daughter nucleus Li(7) . The other disintegration
fragments were detected by the annihilation of the emitted
positrons which produced 511-KeV photons. A copper radiator was
introduced in one-half of the bombardments of each type of nucleus
in order to separate the electron and photon effects. Unstable C(11) nuclei were detected as products from all three
bombarded nuclei, with electrcdisintegration cross sections ranging
from 29.4 yb for carbon to 0.29 yb for oxygen. The N(13) activity
resulted from bombardment of both melamine and water, yielding cross
sections of 9.43 ub and 0.58 yb for nitrogen and oxygen, respectively.
Oxygen has an electrodisintegration cross section of 21.8 yb for production of O(15). Integrated photodisintegration cross sections
were found to be 40 to 50 times the above values for the same targets
and decay fragments,
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