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Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

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Fraile Prieto, Luis Mario and Vedia Fernández, María Victoria and ..., otros (2017) Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra. In ND 2016: International conference on nuclear data for science and technology. EPJ Web of Conferences (146). E D P Sciences. ISBN 978-2-7598-9020-0

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Official URL: http://dx.doi.org/10.1051/epjconf/201714610002




Abstract

The accurate determination of reactor antineutrino spectra remains a very active research topic for which new methods of study have emerged in recent years. Indeed, following the long-recognized reactor anomaly (measured antineutrino deficit in short baseline reactor experiments when compared with spectral predictions), the three international reactor neutrino experiments Double Chooz, Daya Bay and Reno have recently demonstrated the existence of spectral distortions in their measurements with respect to the same predictions. These spectral predictions were obtained through the conversion of integral beta-energy spectra obtained at the ILL research reactor. Several studies have shown that the underlying nuclear physics required for the conversion of these spectra into antineutrino spectra is not totally understood. An alternative to such converted spectra is a complementary approach that consists of determining the antineutrino spectrum by means of the measurement and processing of nuclear data. The beta properties of some key fission products suffer from the pandemonium effect which can be circumvented by the use of the Total Absorption Gammaray Spectroscopy technique (TAGS). The two main contributors to the Pressurized Water Reactor antineutrino spectrum in the region where the spectral distortion has been observed are ⁹²Rb and ¹⁴²Cs, which have been measured at the radioactive beam facility of the University of Jyväskylä in two TAGS experiments. We present the results of the analysis of the TAGS measurements of the β-decay properties of ⁹²Rb along with preliminary results on ¹⁴²Cs and report on the measurements already performed.


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© The Authors, published by EDP Sciences.
International Conference on Nuclear Data for Science and Technology (ND) (2016. Brujas, Bélgica).
The authors acknowledge the nuclear data section of the IAEA and especially Paraskevi (Vivian) Dimitriou for fostering research in the field through the TAGS consultant meetings and the CRP about beta-delayed neutron emission. This work was supported by the CHANDA European project, the In2p3 institute of CNRS, and the NEEDS challenge through the NACRE project. This work was supported by the Academy of Finland under Project No. 213503, Nuclear and Accelerator-Based Physics Research at JYFL. This work was supported by Spanish Ministerio de Economía y Competitividad under grants FPA2008- 06419, FPA2010-17142 and FPA2011- 24553 and FPA2014-52823-C2-1-P, CPAN CSD-2007-00042 (Ingenio2010), and the program Severo Ochoa (SEV- 2014-0398) and by EPSRC and STFC (UK). Work at ANL was supported by the U.S Department of Energy under contract DE-AC02- 06CH11357.
Artículo firmado por más de diez autores.

Uncontrolled Keywords:Products
Subjects:Sciences > Physics > Nuclear physics
ID Code:47810
Deposited On:11 Jul 2018 11:33
Last Modified:10 Dec 2018 14:57

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