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  using trapassisted
spectroscopy that provided radioactive beams of very high isotopic purity 
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  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].
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122, 042502 (2019)