Elsevier

Nuclear Physics A

Volume 596, Issue 1, 1 January 1996, Pages 83-90
Nuclear Physics A

Precision measurement of the RaE shape factor

https://doi.org/10.1016/0375-9474(95)00381-9Get rights and content

Abstract

We apply to RaE a new method to determine the shape factor coefficients of pure beta transitions with energies over the Cherenkov threshold of water. This method is based on the precision measurement of one observable, the ft-value, and two quasi-observables, the Cherenkov counting efficiency and the position of the maximum point of the liquid-scintillation logarithmic pulse-height spectrum. We found for the revised shape factor function that the ground state wave function |210Bi, 1−1〉 is the combination of the three wave functions |1h922g92, |1h921i112 and |1h922g72. This result is also confirmed by the excellent agreement we obtain with experiment for the longitudinal electron polarization.

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