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Title: Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

Here, 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 Gamma-ray 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 themore » radioactive beam facility of the University of Jyvaskyla 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.« less
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  1. Univ. de Nantes, Nantes (France)
  2. IFIC (CSIC-Univ. Valencia), Valencia (Spain)
  3. IFIC (CSIC-Univ. Valencia), Valencia (Spain); MTA ATOMKI (Hungary)
  4. Univ. of Surrey, Guildford (United Kingdom)
  5. Univ. of Helsinki (Finland)
  6. Petersburg Nuclear Physic Institute, Gatchina (Russia)
  7. Univ. Politecnica de Catalunya (UPC), Barcelona (Spain)
  8. CIEMAT, Madrid (Spain)
  9. Univ. of Jyvaskyla (Finland)
  10. Univ. Complutense, Madrid (Spain)
  11. Culham Science Centre, Abingdon (United Kingdom)
  12. Istanbul Univ., Istanbul (Turkey)
  13. IFIC (CSIC-Univ. Valencia), Valencia (Spain); Univ. of Surrey, Guildford (United Kingdom)
  14. Argonne National Lab. (ANL), Argonne, IL (United States)
  15. Institut de Physique Nucleaire d'Orsay, Orsay (France)
  16. Instituto de Estructura de la Materia, Madrid (Spain)
  17. Univ. of Surrey, Guildford (United Kingdom); National Physical Lab., Middlesex (United Kingdom)
  18. Univ. of Jyvaskyla (Finland); RIKEN, Saitama (Japan)
  19. Brookhaven National Lab. (BNL), Upton, NY (United States)
  20. Univ. of Jyvaskyla (Finland); Ludwig-Maximilian Univ. Munich, Garching (Germany)
Publication Date:
Report Number(s):
BNL-114415-2017-JA
Journal ID: ISSN 2100-014X
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 146; Journal ID: ISSN 2100-014X
Publisher:
EDP Sciences
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1405928