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SUMMARY:Final results of the $^{239}$Pu neutron capture and fission cross-
 section measurements at n_TOF
DTSTART;VALUE=DATE-TIME:20251119T131500Z
DTEND;VALUE=DATE-TIME:20251119T133000Z
DTSTAMP;VALUE=DATE-TIME:20260421T025024Z
UID:indico-contribution-28995@indico.ific.uv.es
DESCRIPTION:Speakers: Adrian Sanchez Caballero (CIEMAT)\nImproving the acc
 uracy of the neutron capture and fission cross sections of $^{239}$Pu is l
 isted as a High Priority Request by the Nuclear Energy Agency (NEA/OECD)\,
  due to their central importance for nuclear applications and reactor tech
 nology. To address this\, a dedicated experimental campaign was carried ou
 t at n_TOF\, the CERN time-of-flight facility\, where $^{239}$Pu was measu
 red for the first time. The experiment employed ten high-purity $^{239}$Pu
  samples (total mass less than 10 mg) produced at JRC-Geel and SCK CEN and
  placed in a custom ionization chamber capable of operating under the high
  α-decay background of $^{239}$Pu. The fission tagging technique\, based 
 on the use of fission fragment detectors in coincidence with the n_TOF Tot
 al Absorption Calorimeter\, enabled a precise determination of the capture
  cross section by suppressing the dominant fission background. Additionall
 y\, a 100 mg $^{239}$Pu sample was used to extend the capture measurement 
 up to 10 keV. \n\nThis contribution to the XVII CPAN Days will present the
  final results of the campaign. The complete data analysis\, including the
  procurement of the resonance parameters using the SAMMY code\, provides h
 igh-precision cross sections for both capture and fission reactions. Parti
 cular emphasis will be placed on the $^{239}$Pu(n\,γ) results\, presented
  here for the first time\, including detailed resonance analysis and a dir
 ect comparison with evaluated nuclear data libraries and previous experime
 ntal datasets. The outcomes confirm the reliability of the n_TOF measureme
 nts and provide improved constraints for nuclear data evaluations\, contri
 buting directly to the NEA High Priority Request List.\n\nhttps://indico.i
 fic.uv.es/event/8035/contributions/28995/
LOCATION:
URL:https://indico.ific.uv.es/event/8035/contributions/28995/
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