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SUMMARY:Beta Decay Spectra Measurements for the Study of Reactors’ Antin
 eutrino Spectra.
DTSTART;VALUE=DATE-TIME:20240530T133000Z
DTEND;VALUE=DATE-TIME:20240530T135000Z
DTSTAMP;VALUE=DATE-TIME:20260421T043803Z
UID:indico-contribution-23817@indico.ific.uv.es
DESCRIPTION:Speakers: G. A. Alcalá (Instituto de Física Corpuscular (IFI
 C)\, València\, Spain.)\nRecent predictions of reactors $\\bar{\\nu}$ spe
 ctra have revealed two irregularities: the Reactor Antineutrino Anomaly (R
 AA) and the spectral "bump" [1\,2\,3]. These predictions\, calculated with
  the Huber-Muller Conversion model [4\,5]\, have provoked several doubts a
 bout the integrity of experimental data and the accuracy of the models use
 d. In view of this\, improved measurements of nuclear data of relevant iso
 topes\, and the use of the Summation Calculation method [6] to determine r
 eactors $\\bar{\\nu}$ spectra\, present an alternative to the Conversion m
 odel. Calculations of reactors $\\bar{\\nu}$ spectra employing $\\beta$ fe
 edings from standard databases may suffer from the Pandemonium Effect\, wh
 ich can be mitigated by using the Total Absorption Gamma Spectroscopy (TAG
 S) technique [7].\n\nThe decays of a relatively small number of neutron ri
 ch fission products contribute the most to reactors $\\bar{\\nu}$ spectra 
 within the regions where the effects of the RAA and the "bump" are stronge
 r [8]. Therefore\, to directly determine reliable energy distributions (or
  shapes) of these $\\beta$ decay spectra\, experimental campaigns have bee
 n performed at the IGISOL facility (Jyväskylä\, Finland) with newly deve
 loped telescope detectors. Several $\\beta$ decay spectra of utmost releva
 nce for the study of the RAA and the "bump" have been measured in the I233
  (2022) and I233add (2023) experiments.\n\nThis presentation is dedicated 
 to introduce the problem of the RAA and the "bump"\, and how the calculati
 ons of reactors $\\bar{\\nu}$ spectra are improved with the use of the Sum
 mation method and TAGS $\\beta$ feedings. Preliminary results of the analy
 sis of the data of the I233 experiment will be shown.\n\n[1] G. Mention et
  al.\, Physical Review D 83\, 073006 (2011).\n[2] J. H. Choi\, et al.\, Ph
 ysical Review Letters 116\, 211801. (2016).\n[3] F. P. An et al.\, Chinese
  Physics C 41\, 013002. (2017).\n[4] P. Huber\, Physical Review C 84\, 246
 17 (2011)\; Physical Review C 85\, 029901 (2012).\n[5] T. A. Muller et al.
 \, Physical Review C - Nuclear Physics 83\, 054615 (2011).\n[6] M. Estienn
 e et al.\, Physical Review Letters 123\, 022502 (2019).\n[7] A. Algora et 
 al.\, European Physical Journal A 57\, 85 (2021).\n[8] L. Hayen et al.\, P
 hysical Review C 100\, 054323 (2019).\n\nWe acknowledge the support from t
 he following projects: Prometeo Grant (CIPROM/2022/9)\, ASFAE Project (ASF
 AE/2022/027) and PID2022-138297NB-C21.\n\nhttps://indico.ific.uv.es/event/
 7332/contributions/23817/
LOCATION:ADEIT - Valencia
URL:https://indico.ific.uv.es/event/7332/contributions/23817/
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