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Published July 1, 1960 | public
Journal Article Open

Measurement of the circular polarization of resonance-scattered gamma rays following the electron capture of Se75


The circular polarization of the 265-kev γ rays following the mixed Gamow-Teller and Fermi electron-capture decay of Se75 into As75 has been measured. The neutrino momentum was fixed with the help of a resonance scattering process. From the experimentally determined degree of right-hand circular polarization of -0.21±0.15 it was concluded that the sign of the Gamow-Teller to Fermi matrix-element ratio in this beta decay is negative.

Additional Information

©1960 The American Physical Society. Received 8 February 1960. We wish to thank Dr. H. Weidenmuller and Dr. L. Kruger for many helpful discussions.


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