1. Improved STEREO simulation with a new gamma ray spectrum of excited gadolinium isotopes using FIFRELIN
- Author
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Manfred Lindner, J. Haser, M. Vialat, D. Lhuillier, C. Roca, H. Almazan, Adrien Blanchet, I. El Atmani, Torsten Soldner, T. Materna, Christian Buck, J. S. Real, F. Kandzia, A. Chebboubi, A. Stutz, P. del Amo Sanchez, L. Thulliez, L. Labit, Stefan Schoppmann, A. Letourneau, S. Kox, V. Savu, Olivier Litaize, A. Bonhomme, J. Lamblin, A. Minotti, T. Salagnac, V. Sergeyeva, H. Pessard, L. Bernard, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Almazan, H, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, Chebboubi, A, del Amo Sanchez, P, El Atmani, I, Haser, J, Kandzia, F, Kox, S, Labit, L, Lamblin, J, Letourneau, A, Lhuillier, D, Lindner, M, Litaize, O, Materna, T, Minotti, A, Pessard, H, Real, J, Roca, C, Salagnac, T, Savu, V, Schoppmann, S, Sergeyeva, V, Soldner, T, Stutz, A, Thulliez, L, Vialat, M, and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
- Subjects
Nuclear and High Energy Physics ,Physics - Instrumentation and Detectors ,Gadolinium ,Astrophysics::High Energy Astrophysical Phenomena ,Nuclear Theory ,scintillation counter: liquid ,FOS: Physical sciences ,chemistry.chemical_element ,antineutrino/e: energy spectrum ,Scintillator ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,n: thermal ,01 natural sciences ,7. Clean energy ,programming ,High Energy Physics - Experiment ,Nuclear physics ,High Energy Physics - Experiment (hep-ex) ,Positron ,data compilation ,gadolinium: admixture ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Neutron ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,Nuclear Experiment (nucl-ex) ,n: capture ,010306 general physics ,Nuclear Experiment ,numerical calculations ,Physics ,010308 nuclear & particles physics ,Gamma ray ,Instrumentation and Detectors (physics.ins-det) ,simulation ,3. Good health ,Neutron capture ,gamma ray: emission ,chemistry ,sterile neutrino ,Inverse beta decay ,nuclear reactor ,Delayed neutron ,gadolinium: nuclide ,neutron capture - Abstract
The STEREO experiment measures the electron antineutrino spectrum emitted in a research reactor using the inverse beta decay reaction on H nuclei in a gadolinium loaded liquid scintillator. The detection is based on a signal coincidence of a prompt positron and a delayed neutron capture event. The simulated response of the neutron capture on gadolinium is crucial for the comparison with data, in particular in the case of the detection efficiency. Among all stable isotopes, $^{155}$Gd and $^{157}$Gd have the highest cross sections for thermal neutron capture. The excited nuclei after the neutron capture emit gamma rays with a total energy of about 8 MeV. The complex level schemes of $^{156}$Gd and $^{158}$Gd are a challenge for the modeling and prediction of the deexcitation spectrum, especially for compact detectors where gamma rays can escape the active volume. With a new description of the Gd(n,${\gamma}$) cascades obtained using the FIFRELIN code, the agreement between simulation and measurements with a neutron calibration source was significantly improved in the STEREO experiment. A database of ten millions of deexcitation cascades for each isotope has been generated and is now available for the user., Comment: 5 pages, 3 figures
- Published
- 2019
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