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SUMMARY:Measurements of cumulative fission product yields and their impact
  on reactor antineutrino spectra
DTSTART;VALUE=DATE-TIME:20260506T102000Z
DTEND;VALUE=DATE-TIME:20260506T110000Z
DTSTAMP;VALUE=DATE-TIME:20260514T131956Z
UID:indico-contribution-30425@indico.ific.uv.es
DESCRIPTION:Speakers: Sean Finch (Duke University)\nA TUNL-LLNL-LANL colla
 boration has employed a rapid target transfer system to measure cumulative
  fission product yields (FPYs) following neutron-induced fission of $^{235
 }$U\, $^{238}$U\, and $^{239}$Pu at a neutron energy of 2.0 MeV. This work
  expands our previously published measurements of end-chain FPYs to includ
 e fission products up to four nuclides away from stability. The cyclic act
 ivation technique was used with a variety of irradiation and counting time
 s to probe fission products with half-lives as low as 0.5 s. Using literat
 ure $\\gamma$-ray intensity values\, cumulative FPYs were determined for a
 pproximately 50 short-lived fission products from each of the three actini
 des. These include most of the key fission products expected to contribute
  to the structure observed in the reactor antineutrino spectrum around 5 M
 eV. Overall\, comparison of our FPY data with the ENDF/B-VIII.0 and JEFF-3
 .3 evaluations shows very good agreement\; however\, there exist differenc
 es in some cumulative FPYs\, such as in cases where the yield is split bet
 ween the ground state and a long-lived isomeric state. Substituting the pr
 esent FPY data into the ENDF/B-VIII.0 and JEFF-3.3 evaluations and using t
 he summation model to calculate the reactor antineutrino energy spectra do
 es not eliminate the 5 MeV bump feature. Instead\, it provides stronger ev
 idence for the bump and improves agreement with the Daya Bay data. We also
  present preliminary FPY data at lower incident neutron energies\, 60 and 
 560 keV\, for $^{235}$U and $^{239}$Pu.\n\nhttps://indico.ific.uv.es/event
 /8411/contributions/30425/
LOCATION:Universe Salón de Actos del Edificio de Cabecera (PCUV) 
URL:https://indico.ific.uv.es/event/8411/contributions/30425/
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