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SUMMARY:Update of the summation calculations for reactor antineutrino spec
 tra
DTSTART;VALUE=DATE-TIME:20260505T100000Z
DTEND;VALUE=DATE-TIME:20260505T104000Z
DTSTAMP;VALUE=DATE-TIME:20260514T131949Z
UID:indico-contribution-30543@indico.ific.uv.es
DESCRIPTION:Speakers: M.  Estienne (SUBATECH\, CNRS/IN2P3)\, M.  Fallot (S
 UBATECH\, CNRS/IN2P3)\nSUBATECH\, CNRS/IN2P3\, Nantes Université\, IMT At
 lantique\, F-44307 Nantes\, France\nContact: estienne@subatech.in2p3.fr\nK
 ey words: reactor antineutrinos\, summation calculations\, nuclear data\, 
 TAGS\nAbstract: The accurate determination of reactor antineutrino spectra
  remains a very actual research topic for which interrogations have emerge
 d in the past decade. Indeed\, after the “reactor anomaly” (RAA) [1] 
 – a deficit of measured antineutrinos at short baseline reactor experime
 nts with respect to spectral predictions – the three international react
 or neutrino experiments Double Chooz\, Daya Bay and Reno have evidenced sp
 ectral distortions in their measurements w.r.t the same spectral predictio
 ns (Shape Anomaly)[2]. This puzzle is called the “shape anomaly”. The 
 latter predictions were obtained through the conversion of integral beta e
 nergy spectra obtained at the ILL research reactor[3]. Several studies hav
 e shown that the underlying nuclear physics required for the conversion of
  these spectra into antineutrino spectra is not totally under control [4].
  The unique alternative to converted spectra is a complementary approach c
 onsisting in determining the antineutrino spectrum through nuclear data [5
 \,6]. In the past years\, the reactor neutrino experiments such as Prospec
 t [7]\, STEREO [8] and Daya Bay [9] have published in 2023 their analysis 
 with the complete statistics of the measured data. The outcome of these an
 alyses\, combined with the work carried out in experimental nuclear physic
 s with the TAGS measurements in particular [10\, 11\, 12]\, is that the st
 erile neutrino hypothesis is strongly disfavored to explain the RAA\, but 
 that further efforts remain to be made both theoretically and experimental
 ly to fully understand the origin of RAA and shape anomaly\, and that accu
 rate predictions of antineutrino fluxes and spectra are still needed for f
 uture discoveries. Indeed the Daya Bay collaboration provided the first me
 asurement of the high energy part of the reactor antineutrino spectrum abo
 ve 8 MeV. In addition\, the Juno-Tao [13] experiment will perform a measur
 ement of reactor antineutrino spectra with unprecedented energy resolution
  that will allow to tackle the contribution of specific fission products a
 nd constrain potentially nuclear data with the measured antineutrinos. The
  summation method based on the nuclear data will be the privileged tool to
  interpret these measurements. At this workshop\, we propose to present an
  update of our summation calculations with recently published TAGS results
  for 96\,96mY [14]\, 95Rb and 137I [15]\, as well as new TAGS results for 
 138I\, 142Cs and 99Y. The new SM2026 predictions will be compared with the
  most recent results from Daya Bay [16]. \n\n[1] G. Mention et al. \, Phys
 . Rev. D 83 \, 073006 (2011)\n[2] Double Chooz and Reno Collab. in Proceed
 ings of the Neutrino 2014 Conf.\, http://neutrino2014.bu.edu/\; Daya Bay C
 ollab. in Proceedings of the ICHEP 2014 Conf.\, http://ichep2014.es/.\n[3]
  P. Huber\, Phys. Rev. C 84\, 024617 (2011). \n[4] A. C. Hayes et al.\, Ph
 ys. Rev. Lett. 112\, 202501 (2014).\n[5] M. Fallot et al.\, Phys. Rev. Let
 t. 109  \, 202504 (2012). \n[6] A A. Sonzogni et al. \, Phys. Rev. C 91 \,
  011301 (R) (2015). \n[7] M. Andriamirado et al.\, Prospect Collab. Phys. 
 Rev. Lett. 131\, 021802 (2023)\n[8] F.P. An et al. Daya Bay collab.\, Phys
 . Rev. Lett. 130 (2023) 211801 and F.P. An et al. Daya Bay collab.\, Phys.
  Rev. Lett. 129 (2022) 041801). \n[9] H. Almazan et al.\, STEREO collab. N
 ature 613\, 257–261 (2023). https://doi.org/10.1038/s41586-022-05568-2.\
 n[10] M. Estienne et al. Phys. Rev. Lett. 123\, 022502 (2019).\n[11] A. Al
 gora\, B. Rubio\, J.-L. Tain\, M. Fallot\, W. Gelletly Review Paper Eur. P
 hys. J. A 57\, 85 (2021)\n[12] Chao Zhang a\, Xin Qian a\, Muriel Fallot b
 Progress in Particle and Nuclear Physics Vol. 136\, (2024)\, 104106\n[13] 
 A. Abusleme\, et al.\, TAO Conceptual Design Report. arXiv:2005.08745. \n[
 14] V. Guadilla et al. Phys. Rev. C 106\, 014306 (2022) \n[15] V. Guadilla
  et al. Phys. Rev. C 100\, 044305 (2019)\n[16] DB collaboration\, Phys. Re
 v. Lett.  134\, 201802 (2025)\n\nhttps://indico.ific.uv.es/event/8411/cont
 ributions/30543/
LOCATION:Universe Salón de Actos del Edificio de Cabecera (PCUV) 
URL:https://indico.ific.uv.es/event/8411/contributions/30543/
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