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SUMMARY:Progress in accounting for the antineutrino spectrum generated by 
 nuclear reactors
DTSTART;VALUE=DATE-TIME:20260505T104000Z
DTEND;VALUE=DATE-TIME:20260505T112000Z
DTSTAMP;VALUE=DATE-TIME:20260514T131948Z
UID:indico-contribution-30515@indico.ific.uv.es
DESCRIPTION:Speakers: A. A.  Sonzogni (Brookhaven National Laboratory)\nUn
 derstanding the magnitude and detailed features of the highly precise IBD 
 antineutrino spectra reported by the Daya Bay\, NEOS\, and RENO collaborat
 ions has been both a challenging and rewarding endeavor. Relative to the H
 uber–Mueller model\, these spectra exhibit an overall ~5% excess in the 
 predicted total yield—commonly referred to as the Reactor Antineutrino A
 nomaly (RAA)—as well as a deficit in the 4–6 MeV region\, often called
  the “bump.” The origin of the RAA has been linked to a normalization 
 issue in the 235-Uranium electron spectrum measurements\, while the “bum
 p” is suspected to arise from efficiency effects in the magnetic spectro
 graph used in those measurements. In addition\, the assumption of allowed 
 spectral shapes in the conversion method has been increasingly questioned.
 \n \nSummation (ab initio) calculations\, while valuable for tracing antin
 eutrino production\, have also faced limitations. These stem primarily fro
 m incomplete nuclear database information\, particularly for the short-liv
 ed fission products that dominate the IBD spectrum. Until recently\, decay
  heat calculations represented the only other application requiring simila
 r data\, although the corresponding standards are less precise than the IB
 D measurements discussed here.\n \nThe JUNO collaboration released through
  arXiv their first results in November 2025.   At 53 Km from the reactors\
 , the oscillation pattern induced by theta-13 - not yet apparent but expec
 ted with a larger number of events - as well as the shifting of the spectr
 um at higher energies due to a non-zero value of theta-12\, will reinforce
  even further the need for better nuclear decay data and the electron spec
 tra for the actinide nuclides undergoing fission.\n \nAcknowledgement:  Th
 is work was supported in part by the U.S. Department of Energy Office of S
 cience\, Office of Nuclear Physics\, under Contract No. DE-AC02-98CH10886.
 \n\nhttps://indico.ific.uv.es/event/8411/contributions/30515/
LOCATION:Universe Salón de Actos del Edificio de Cabecera (PCUV) 
URL:https://indico.ific.uv.es/event/8411/contributions/30515/
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