Beta and gama spectra of short-lived fission products

Nuclear structure insights into reactor antineutrino spectra

“…We note that the ENDF/B-VII.1 library has a ∼50% branch which we have updated for the present calculations. As mentioned previously, Rudstam et al, [23] directly measured the β spectrum for a number of fission products. In Fig.…”

“…The major change to the decay data library is that, when available, we have used branching ratio data from TAGS experiments [21,22]. In addition, we use the direct β-spectrum measurements of Rudstam et al [23] to obtain I i (E ν ) for ten nuclides without TAGS data and with incomplete decay schemes. Finally, the ENDF/B-VII.1 decay data sub-library includes theoretical calculations [24] of β-spectra for the most neutron rich nuclides with incomplete decay schemes.…”

Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

“…The two sets of data give very similar antineutrino spectra, which is why the impact of the new TAGS data on these two sets is almost the same (red and green lines superposed on the plots). Note that the sharp drop in one single bin located at the Q value comes from the fact that we use the most recent adopted Q value of 8095 keV for 92 Rb which is different from the one measured by the authors of [27] at the time. In their calculation, the authors of [17] used 2.…”

“…Ratio between the antineutrino spectra calculated using the latest TAGS results with respect to the data on 92 Rb decay used in [4] (thick red dashed-dotted line), in [20] (green dotted line) and in [17] (black dashed line). The sharp drop in the ratio, in one single bin located at the Q value of the 92 Rb, is due to the different values in Q given in [27] and E N S DF, that were used to reconstruct the antineutrino spectrum.…”

“…In this way, we compare only the beta decay properties of the nucleus involved. While [4] used the data from [20,27] used the latest version of the E N DF/B − V I I library. The two sets of data give very similar antineutrino spectra, which is why the impact of the new TAGS data on these two sets is almost the same (red and green lines superposed on the plots).…”