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Your search keyword '"El Atmani, I."' showing total 3 results
Start Over Author "El Atmani, I." Publisher american physical society
3 results on '"El Atmani, I."'

1. Improved sterile neutrino constraints from the STEREO experiment with 179 days of reactor-on data IMPROVED STERILE NEUTRINO CONSTRAINTS from the ... ALMAZÁN H. et al

Author

Almazan H., Bernard L., Blanchet A., Bonhomme A., Buck C., Del Amo Sanchez P., El Atmani I., Haser J., Kandzia F., Kox S., Labit L., Lamblin J., Letourneau A., Lhuillier D., Licciardi M., Lindner M., Materna T., Minotti A., Pessard H., Real J. -S., Roca C., Rogly R., Salagnac T., Savu V., Schoppmann S., Sergeyeva V., Soldner T., Stutz A., Vialat M., Almazan, H, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, Del Amo Sanchez, P, El Atmani, I, Haser, J, Kandzia, F, Kox, S, Labit, L, Lamblin, J, Letourneau, A, Lhuillier, D, Licciardi, M, Lindner, M, Materna, T, Minotti, A, Pessard, H, Real, J, Roca, C, Rogly, R, Salagnac, T, Savu, V, Schoppmann, S, Sergeyeva, V, Soldner, T, Stutz, A, and Vialat, M

Subjects
sterile neutrinos, neutrino oscillation, reactor
Abstract

The STEREO experiment is a very short baseline reactor antineutrino experiment. It is designed to test the hypothesis of light sterile neutrinos being the cause of a deficit of the observed antineutrino interaction rate at short baselines with respect to the predicted rate, known as the reactor antineutrino anomaly. The STEREO experiment measures the antineutrino energy spectrum in six identical detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this article, results from 179 days of reactor turned on and 235 days of reactor turned off are reported at a high degree of detail. The current results include improvements in the modelling of detector optical properties and the γ-cascade after neutron captures by gadolinium, the treatment of backgrounds, and the statistical method of the oscillation analysis. Using a direct comparison between antineutrino spectra of all cells, largely independent of any flux prediction, we find the data compatible with the null oscillation hypothesis. The best-fit point of the reactor antineutrino anomaly is rejected at more than 99.9% C.L.

Published
2020

2. Joint Measurement of the ^{235}U Antineutrino Spectrum by PROSPECT and STEREO.

Author

Almazán H, Andriamirado M, Balantekin AB, Band HR, Bass CD, Bergeron DE, Bernard L, Blanchet A, Bonhomme A, Bowden NS, Bryan CD, Buck C, Classen T, Conant AJ, Deichert G, Del Amo Sanchez P, Delgado A, Diwan MV, Dolinski MJ, El Atmani I, Erickson A, Foust BT, Gaison JK, Galindo-Uribarri A, Gilbert CE, Hans S, Hansell AB, Heeger KM, Heffron B, Jaffe DE, Jayakumar S, Ji X, Jones DC, Koblanski J, Kyzylova O, Labit L, Lamblin J, Lane CE, Langford TJ, LaRosa J, Letourneau A, Lhuillier D, Licciardi M, Lindner M, Littlejohn BR, Lu X, Maricic J, Materna T, Mendenhall MP, Meyer AM, Milincic R, Mueller PE, Mumm HP, Napolitano J, Neilson R, Nikkel JA, Nour S, Palomino JL, Pessard H, Pushin DA, Qian X, Réal JS, Ricol JS, Roca C, Rogly R, Rosero R, Salagnac T, Savu V, Schoppmann S, Searles M, Sergeyeva V, Soldner T, Stutz A, Surukuchi PT, Tyra MA, Varner RL, Venegas-Vargas D, Vialat M, Weatherly PB, White C, Wilhelmi J, Woolverton A, Yeh M, Zhang C, and Zhang X

Abstract

The PROSPECT and STEREO collaborations present a combined measurement of the pure ^{235}U antineutrino spectrum, without site specific corrections or detector-dependent effects. The spectral measurements of the two highest precision experiments at research reactors are found to be compatible with χ^{2}/ndf=24.1/21, allowing a joint unfolding of the prompt energy measurements into antineutrino energy. This ν[over ¯]_{e} energy spectrum is provided to the community, and an excess of events relative to the Huber model is found in the 5-6 MeV region. When a Gaussian bump is fitted to the excess, the data-model χ^{2} value is improved, corresponding to a 2.4σ significance.

Published
2022
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3. Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment.

Author

Almazán H, Bernard L, Blanchet A, Bonhomme A, Buck C, Del Amo Sanchez P, El Atmani I, Labit L, Lamblin J, Letourneau A, Lhuillier D, Licciardi M, Lindner M, Materna T, Méplan O, Pessard H, Pignol G, Réal JS, Ricol JS, Roca C, Rogly R, Salagnac T, Sarrazin M, Savu V, Schoppmann S, Soldner T, Stutz A, and Vialat M

Abstract

Different extensions of the standard model of particle physics, such as braneworld or mirror matter models, predict the existence of a neutron sterile state, possibly as a dark matter candidate. This Letter reports a new experimental constraint on the probability p for neutron conversion into a hidden neutron, set by the STEREO experiment at the high flux reactor of the Institut Laue-Langevin. The limit is p<3.1×10^{-11} at 95% C.L. improving the previous limit by a factor of 13. This result demonstrates that short-baseline neutrino experiments can be used as competitive passing-through-walls neutron experiments to search for hidden neutrons.

Published
2022
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