Speaker
Description
Nuclear structure and practical applications require beta decay data free from the Pandemonium effect [1,2]. For a proper beta decay description, we need information on the Q value of the decay, the half-life and the beta decay probabilities to the different levels in the daughter nucleus. Pandemonium, in this context, means that the beta decay probabilities might be distorted because of the technique used
for their determination. Two techniques are considered free from the Pandemonium distortion: the total absorption gamma-ray spectroscopy study of the decay and the measurement of the shape of the beta spectrum. In this contribution I will show the result of recent measurements of beta spectrum shapes of relevance for reactor antineutrino spectrum calculations [3] and how those
measurements compare with total absorption measurement results from the same decays.The impact of some selected measurements in nuclear structure and astrophysics will also be discussed.
[1] J. Hardy, et al., Phys. Lett. B 71 (1977) 307
[2] A. Algora, et al., Eur. Phys. J. A (2021) 57:85
[3] G. Alcalá, et al., Phys. Rev. Letts. 135, 142502 (2025)