Total Absorption Spectroscopy Study of Rb 92 Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape

Zakari-Issoufou, A. -A. and Fallot, M. and Porta, A. and Algora, Alejandro and Tain, J. L. and Podolyák, Zsolt (2015) Total Absorption Spectroscopy Study of Rb 92 Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape. PHYSICAL REVIEW LETTERS, 115 (10). ISSN 0031-9007

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Abstract

The antineutrino spectra measured in recent experiments at reactors are inconsistent with calcu- lations based on the conversion of integral beta spectra recorded at the ILL reactor. 92Rb makes the dominant contribution to the reactor antineutrino spectrum in the 5-8 MeV range but its decay properties are in question. We have studied 92Rb decay with total absorption spectroscopy. Previ- ously 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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