# Total absorption spectroscopy study of $^{92}$Rb decay: a major contributor to reactor antineutrino flux

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.
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Journal articles
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Submitted on : Tuesday, June 16, 2015 - 7:52:53 AM
Last modification on : Wednesday, August 4, 2021 - 3:54:02 PM

### Citation

A. -A. Zakari-Issoufou, Muriel Fallot, Amanda Porta, A. Algora, J. L. Tain, et al.. Total absorption spectroscopy study of $^{92}$Rb decay: a major contributor to reactor antineutrino flux. Physical Review Letters, American Physical Society, 2015, 110 (10), pp.102503. ⟨10.1103/PhysRevLett.115.102503⟩. ⟨in2p3-01163990⟩

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