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

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Valencià Castellano

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

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Algora, Alejandro; Taín Enríquez, José Luis; Valencia, Ebhelixes; Agramunt Ros, Jorge; Estévez Aguado, María Esther; Gelletly, W.; Jordán Martín, María Dolores; Molina Palacios, Francisco Gabriel; Pérez Cerdán, Ana Belén; Rubio Barroso, Berta

Aquest document és un/a article, creat/da en: 2015

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. Rb-92 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 Rb-92 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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