BETA SPECTRUM OF Ca$sup 4$$sup 7$
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
A detailed magnetic spectrometer study was made of the shape of the beta- ray spectrum in the decay of Ca/sup 47/. It was definitely established that the highest energy transition does not have a once forbidden unique shape and, therefore, that a 3/2/sup +/ assignment to the ground state of Ca/sup 47/ is not possible. The ground-state to ground-state transition of 1.979 plus or minus 0.005 Mev is probably from a 7/2/sup -/ initial to a 7/2/sup -/ final state with an abnormally high comparative half life (log ft = 8.5) possibly resulting from distortion of the Ca/sup 47/ nucleus. Evidence was found for a beta transition to the first excited state of Sc/sup 47/. This appears to be a twice forbidden transition from 7/2/sup -/ to 3/2/sup -/ with an energy of 1,486 plus or minus 0.010 Mev and an intensity of 1.3 to 1.8%. The comparative half life for this DELTA I = 2, no transition is relatively short with log ft = 9.0. The beta transition to the second excited state of Sc/sup 47/ has an energy of 0.671 plus or minus 0.010 Mev. The relative intensity is 82.4% and log ft = 6.0. The observations are consistent with an assignment 7/2/sup -/ to 5/2/sup -/. The energies of the three gamma rays that follow the decay of Ca/sup 47/ were measured with a NaI(Tl) detector and 400channel analyzer. The energies were found to be 1.308 plus or minus for the beta decay was measured in the magnetic spectrometer and found to be 4.7 plus or minus 0.1 days. (auth)
- Research Organization:
- Indiana Univ., Bloomington
- NSA Number:
- NSA-18-002930
- OSTI ID:
- 4135808
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 132; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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