Branching of Transitions in Some Mirror Nuclei | Zendy

W. L. Talbert | Zendy; M. G. Stewart | Zendy

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Branching of Transitions in Some Mirror Nuclei

Author(s) -

W. L. Talbert,

M. G. Stewart

Publication year - 1960

Publication title -

physical review

Language(s) - English

Resource type - Journals

eISSN - 1536-6065

pISSN - 0031-899X

DOI - 10.1103/physrev.119.272

Subject(s) - physics , excited state , annihilation , branching (polymer chemistry) , branching fraction , atomic physics , nuclear physics , materials science , composite material

The possibility of branching in the decays of Na/sup 21/, (Mg/sup 243 Al/ sup 25/, Si/sup 27/, S/sup 31/, and Ca/sup 39/ was investigated using NaI(Tl) scintillation detectors. The nuclear gannnna rays emitted as a result of branching transitions were detacted in coincidence with the accompanying positron annihilation radiation. Branching was found to the first excited states of the daughter nuclei in the decays of Na/sup 23/, Mg/sup 23/, and S/sup 31/, with intensities (compared to the total decay) of 2.1, 9.1, and 1.1%, respectively. The decays of Al/sup 25/, Si/sup 27/, and Ca/sup 39/ were found to have no detectable branching to the lower excited states of the daughter nuclei, anti upper limits of less than one per cent were placed on the branching ratios for such branches. The lack of branching in the decay of Al/sup 25/ to the 0.98-Mev level of Mg/sup 25/ favors a unified model description for the nuclear states involved. (auth)

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