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

A. A. Zakari-Issoufou, M. Fallot, A. Porta, A. Algora, J. L. Tain, E. Valencia, S. Rice, V. M. Bui, S. Cormon, M. Estienne, J. Agramunt, J. Äystö, M. Bowry, J. A. Briz, R. Caballero-Folch, D. Cano-Ott, A. Cucoanes, V. V. Elomaa, T. Eronen, E. EstévezG. 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, E. Mendoza, F. Molina, I. Moore, A. B. Perez-Cerdán, Zs Podolyák, H. Penttilä, P. H. Regan, M. Reponen, J. Rissanen, B. Rubio, T. Shiba, A. A. Sonzogni, C. Weber

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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. Rb92 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 Rb92 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.

Original languageEnglish
Article number102503
JournalPhysical review letters
Volume115
Issue number10
DOIs
Publication statusPublished - Sep 4 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Zakari-Issoufou, A. A., Fallot, M., Porta, A., Algora, A., Tain, J. L., Valencia, E., Rice, S., Bui, V. M., Cormon, S., Estienne, M., Agramunt, J., Äystö, J., Bowry, M., Briz, J. A., Caballero-Folch, R., Cano-Ott, D., Cucoanes, A., Elomaa, V. V., Eronen, T., ... Weber, C. (2015). Total Absorption Spectroscopy Study of Rb 92 Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape. Physical review letters, 115(10), [102503]. https://doi.org/10.1103/PhysRevLett.115.102503