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The beta decays of $^{86}$Br and $^{91}$Rb have been studied using the totalabsorption spectroscopy technique. The radioactive nuclei were produced at theIGISOL facility in Jyv\"askyl\"a and further purified using the JYFLTRAP.$^{86}$Br and $^{91}$Rb are considered to be major contributors to the decayheat in reactors. In addition $^{91}$Rb was used as a normalization point indirect measurements of mean gamma energies released in the beta decay offission products by Rudstam {\it et al.} assuming that this decay was wellknown from high-resolution measurements. Our results show that both decays weresuffering from the {\it Pandemonium} effect and that the results of Rudstam{\it et al.} should be renormalized. The relative impact of the studied decaysin the prediction of the decay heat and antineutrino spectrum from reactors hasbeen evaluated.

Total Absorption Spectroscopy Study of the Beta Decay of $^{86}$Br and $^{91}$Rb