Total Absorption Spectroscopy Study of $^{92}$Rb Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape
nucl-ex
/ Authors
A. -A. Zakari-Issoufou, M. Fallot, A. Porta, A. Algora, J. L. Tain, E. Valencia, S. Rice, V. M Bui, S. Cormon, M. Estienne
and 37 more authors
J. Agramunt, J. Äystö, M. Bowry, J. A. Briz, R. Caballero-Folch, D. Cano-Ott, A. Cucoanes, V. -V. Elomaa, T. Eronen, E. Estévez, G. F. Farrelly, A. R. Garcia, W. Gelletly, M. B Gomez-Hornillos, V. Gorlychev, J. Hakala, A. Jokinen, M. D. Jordan, A. Kankainen, P. Karvonen, V. S. Kolhinen, F. G Kondev, T. Martinez,
/ Abstract
The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. $^{92}$Rb makes the dominant contribution to the reactor spectrum in the 5-8 MeV range but its decay properties are in question. We have studied $^{92}$Rb decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed.