Abstract
The energy spectrum of theβ-decay leading from the ground state of139Ba to the first excited state of139La has been measured in coincidence with the 166keV-γ-transition. For the measurement a well tested 4π-β-γ-coincidence spectrometer has been used. Because of its highβ- andγ-efficiency the instrument is especially suitable for selecting the spectrum of a weak and short livingβ-component. The measured spectrum has been corrected for distortions due to bremsstrahlung escaping from the Si(Li)-detectors. The shape factor has been determined and compared with former measurements. The significance of matrix elements extracted from the spectral shape is discussed.
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We thank Drs. H. Behrens, W. Bühring, H. Rebel and L. Szybisz for many clarifying discussions. This work was supported by the Bundesministerium für Forschung und Technologie.
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Flothmann, D., Gils, H.J., Wiesner, W. et al. Spectral shape of the (7/2−→5/2+)-transition in the β-decay of139Ba. Z Physik A 272, 219–222 (1975). https://doi.org/10.1007/BF01408151
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DOI: https://doi.org/10.1007/BF01408151