arxiv: 1504.05812 · v5 · pith:RWVY46QOnew · submitted 2015-04-22 · ⚛️ nucl-ex · hep-ex

Total Absorption Spectroscopy Study of ⁹²Rb 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

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S. Cormon M. Estienne J. Agramunt J. \"Ayst\"o M. Bowry J.A. Briz R. Caballero-Folch D. Cano-Ott A. Cucoanes V.-V. Elomaa T. Eronen E. Est\'evez 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 E. Mendoza F. Molina I. Moore A.B. Perez-Cerd\'an Zs. Podoly\'ak H. Penttil\"a P.H. Regan M. Reponen J. Rissanen B. Rubio T. Shiba A.A. Sonzogni C. Weber IGISOL collaboration

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classification ⚛️ nucl-ex hep-ex

keywords reactorantineutrinodecayspectraabsorptionbetafeedingspectroscopy

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

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