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

The accurate determination of the emitted reactor antineutrino flux is still a major challenge for actual and future neutrino experiments at reactors, especially after the evidence of a disagreement between the measured antineutrino energy spectrum by Double Chooz, Daya Bay, and Reno and calculated antineutrino spectra obtained from the conversion of the unique integral beta spectra measured at the ILL reactor. Using nuclear data to compute reactor antineutrino spectra may help understanding this bias, with the study of the underlying nuclear physics. Summation calculations allow identifying a list of nuclei that contribute importantly to the antineutrino energy spectra emitted after the fission of ²³⁹,²⁴¹Pu and ²³⁵,²³⁸U, and whose beta decay properties might deserve new measurements. Among these nuclei, ⁹²Rb exhausts by itself about 16% of of the antineutrino energy spectrum emitted by Pressurized Water Reactors in the 5 to 8 MeV range. In this Letter, we report new Total Absorption Spectroscopy (TAS) results for this important contributor. The obtained beta feeding from ⁹²Rb shows beta intensity unobserved before in the 4.5 to 5.5 MeV energy region and gives a ground state to ground state branch of 87.5 % ± 3%. These new data induce a dramatic change in recent summationmore » calculations where a 51% GS to GS branch was considered for ⁹²Rb, increasing the summation antineutrino spectrum in the region nearby the observed bias.The new data still have an important impact on other summation calculations in which more recent data were considered« less
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [2] ;  [2] ;  [2] ;  [4] ;  [6] ;  [5] ;  [2] ;  [7] ;  [8] ;  [2] ;  [6] ;  [4] more »;  [5] ;  [8] ;  [5] ;  [7] ;  [7] ;  [6] ;  [6] ;  [4] ;  [6] ;  [9] ;  [8] ;  [8] ;  [4] ;  [6] ;  [4] ;  [5] ;  [6] ;  [5] ;  [2] ;  [6] ;  [4] ;  [6] « less
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); National Physical Lab., Teddington (United Kingdom)
  2. Univ. de Nantes, Nantes (France)
  3. IFIC (CSIC-Univ.), Valencia (Spain); MTA ATOMKI (Hungary)
  4. IFIC (CSIC-Univ.), Valencia (Spain)
  5. Univ. Surrey, Guildford (United Kingdom)
  6. IGISOL Univ., Jyvaskyla (Finland)
  7. Univ. Politecnica de Catalunya (Spain)
  8. Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
  9. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
OSTI Identifier:
1183877
Report Number(s):
BNL--108023-2015-JA
Journal ID: ISSN 0031-9007; PRLTAO; R&D Project: EST-003-NEFA; KB0301041
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 10; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
IGISOL Collaboration
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS national nuclear data center