Speaker
Description
Total absorption spectroscopy is presently the most reliable technique that provides beta
decay transition probabilities free from the Pandemonium systematic error [1-3]. In this
contribution we will present recent results from the work performed by our
collaboration employing this technique, which is relevant for reactor applications and in
particular for the prediction of the antineutrino spectrum in reactors. The measurements
have been performed at the University of Jyväskylä IGISOL IV Facility [4] using trapassisted
spectroscopy that provided radioactive beams of very high isotopic purity [5]
and in certain cases has allowed us to disentangle beta decaying isomers.
These measurements have provided beta decay data that are a key ingredient in an
updated antineutrino summation model [6] that presently provides the best description
of the measured spectra by the Daya Bay collaboration. In this contribution results
coming from our latest experiments will be presented [7-10].
[1] J. C. Hardy et. al., Phys. Lett. B 71, 307 (1977)
[2] B. Rubio et al., Journal of Physics G: Nuclear and Particle Physics 31, S1477
(2005).
[3] A. Algora, B. Rubio and J. L. Tain, Nuclear Physics News, 28, 12 (2018)
[4] I. D. Moore et al., Nucl. Instrum. and Methods B 317,208 (2013)
[5] T. Eronen et al., Eur. Phys. J. A 48, 46 (2012)
[6] M. Estienne et al., Phys. Rev. Lett. 123, 022502 (2019).
[7] J. L. Tain et al., Phys. Rev. Lett. 115, 062502 (2015)
[8] E. Valencia et al., Phys. Rev. C 95, 024320 (2017)
[9] S. Rice et al., Phys. Rev. C 96, 014320 (2017)
[10] V. Guadilla, et al., Phys. Rev. Lett.
122, 042502 (2019)
