CLOUD CHAMBER, GAMMA-GAMMA, AND BETA SPECTRUM STUDIES OF COBALT-56 (thesis)
An investigation was conducted to clarify the modes of positron decay and the gamma-ray de-excitation of cobalt-56 in certain areas. Two samples were used, consisting of proton activated spectroscopically pure iron and enriched iron-56. Both targets were chemically treated to obtain carrier-free samples of cobalt. Beta spectrum data were obtained with a Wilson cloud chamber and a solenoidal spectrometer. Gamma-ray and gamma-gamma coincidence data were obtained with two gamma scintillatlon spectrometers with a colncidence unit having a resolving time of 9.75 x I0s/up -8/ seconds. From the beta spectra data three positron groups were found. The 1.49 and 0.21 Mev groups were assigned to the decay of cobalt-56. The 0.45 Mev group was assigned to the decay of cobalt- 58 because of varying inteasities in different samples. From the gamma-gamma coincldence datas two gamma-rays with energies of 1.30 and 1.34 Mev were determined to be in coincidence with the 0.845 Mev gamma-ray. The 1.75 Mev region was found to consist of two gamma-rays of 1.74 and 1.77 Mev. These were in coincidence with both the 0.845 and 1.24 Mev gamma-rays. The 2.60 Mev region was found to consist of two gamma-rays of 2.54 and 2.60 Mev in coincidence with the 0.845 Mev gammaray. A 2.69 Mev peak was associated with the pair production process of the 3.20 Mev gamma-ray. Additionally, a 2.66 Mev gamma-ray was determined to go to the ground level of iron.-56. By utilizing the information obtained during this investigation, the best available information pertaining to the energy levels of iron-56, and previous results a decay scheme was proposed. (auth)
- Research Organization:
- Ohio State Univ., Columbus
- NSA Number:
- NSA-13-015600
- OSTI ID:
- 4237941
- Report Number(s):
- AD-201562
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
ACTIVATION
BETA DECAY
BETA SPECTROMETERS
CHEMICAL REACTIONS
CLOUD CHAMBERS
COBALT 56
COILS
COINCIDENCE METHODS
ENERGY
ENERGY LEVELS
ENERGY RANGE
ENRICHMENT
GAMMA RADIATION
IRON 56
MAGNETIC FIELDS
MEASURED VALUES
NUCLEAR REACTIONS
PAIR PRODUCTION
POSITRONS
PROTONS
RESOLUTION
SCINTILLATION COUNTERS
SPECTRA
TARGETS