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The $\beta$ decays of the ground state (gs) and isomeric state (m) of$^{96}$Y have been studied with the total absorption $\gamma$-ray spectroscopytechnique at the Ion Guide Isotope Separator On-Line facility. The separationof the 8$^{+}$ isomeric state from the 0$^{-}$ ground state was achieved thanksto the purification capabilities of the JYFLTRAP double Penning trap system.The $\beta$-intensity distributions of both decays have been independentlydetermined. In the analyses the de-excitation of the 1581.6 keV level in$^{96}$Zr, in which conversion electron emission competes with pair production,has been carefully considered and found to have significant impact on the$\beta$-detector efficiency, influencing the $\beta$-intensity distributionobtained. Our results for $^{96\text{gs}}$Y (0$^+$) confirm the large groundstate to ground state $\beta$-intensity probability, although a slightly largervalue than reported in previous studies was obtained, amounting to$96.6_{-2.1}^{+0.3}\%$ of the total $\beta$ intensity. Given that the decay of$^{96\text{gs}}$Y is the second most important contributor to the reactorantineutrino spectrum between 5 and 7 MeV, the impact of the present results onreactor antineutrino summation calculations has been evaluated. In the decay of$^{96\text{m}}$Y (8$^{+}$), previously undetected $\beta$ intensity intransitions to states above 6 MeV has been observed. This shows the importanceof total absorption $\gamma$-ray spectroscopy measurements of $\beta$ decayswith highly fragmented de-excitation patterns. $^{96\text{m}}$Y (8$^{+}$) is amajor contributor to reactor decay heat in uranium-plutonium andthorium-uranium fuels around 10 s after fission pulses, and the newly measuredaverage $\beta$ and $\gamma$ energies differ significantly from the previousvalues in evaluated databases (...)

Total absorption $\gamma$-ray spectroscopy of the $\beta$ decays of $^{96\text{gs,m}}$Y