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Published June 15, 1953 | public
Journal Article Open

Search for 1-Mev Gamma from N16 Decay


In the beta-decay of N16 to the 1- (7.1-Mev) and 3- (6.1-Mev) excited states of O16, respectively, a discrepancy exists between the branching ratio of about 1:1 determined from absorption measurements on the beta-spectrum, and the ratio of about 1:12 from measurement of the associated gamma-ray intensities. If both measurements are to be reconciled, the most likely possibility is a strong E2 gamma-ray transition from the 7.1-Mev to the 6.1-Mev level. The likelihood that this E2could give serious competition to the normal 7.1-Mev E1 ground state transition is enhanced by the isotopic spin selection rule forbidding E1 transitions with [delta]T = N - Z = 0. In order to explain the quantitative discrepancy in this way, however, this selection rule would have to be much stronger than suggested by simple estimates.

Additional Information

©1953 The American Physical Society The authors thank Dr. V. L. Telegdi for discussions, Professor W. W. Havens for help with the cyclotron, and Mr. V. Fitch for the loan of the NaI crystal. Work supported by the research program of the U. S. Atomic Energy Commission.


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