The accurate determination of reactor antineutrino spectra remains a very active research topic for
which new methods of study have emerged in recent years. Indeed, following the long-recognized reactor
anomaly (measured antineutrino deficit in short baseline reactor experiments when compared with spectral
predictions), the three international reactor neutrino experiments Double Chooz, Daya Bay and Reno have
recently demonstrated the existence of spectral distortions in their measurements with respect to the same
predictions. These spectral predictions were obtained through the conversion of integral beta-energy spectra
obtained at the ILL research reactor. Several studies have shown that the underlying nuclear physics required
for the conversion of these spectra into antineutrino spectra is not totally understood. An alternative to such
converted spectra is a complementary approach that consists of determining the antineutrino spectrum by
means of the measurement and processing of nuclear data. The beta properties of some key fission products
suffer from the pandemonium effect which can be circumvented by the use of the Total Absorption Gammaray
Spectroscopy technique (TAGS). The two main contributors to the Pressurized Water Reactor antineutrino
spectrum in the region where the spectral distortion has been observed are 92Rb and 142Cs, which have been
measured at the radioactive beam facility of the University of Jyvaskyl ¨ a in two TAGS experiments. We present ¨
the results of the analysis of the TAGS measurements of the β-decay properties of 92Rb along with preliminary
results on 142Cs and report on the measurements already performed.peerReviewe
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