A critical experiment at HFR of 19 March 2008

Campioni, G.; Calzavara, Y.; Mollier, M.; Atkins, Deborah; Veler, R.; Sebie, P.; Ferrandiz, L.; Micoud, E.; Deyres, J.-C.; Chirol, P.; Puygrenier, C.; Carrière, S. Jeromy; Allemmoz, S.; Samuel, Moses; Meynent, P.-Y.; Laurent, Christian; Mannino, E.; Bonnet, Gérard; Rey, J.-P.; Barbe, Coralie; Renzy, D.; Dupart, F.; Pichoud, L.; Berthier, Jean Luc; Desbrière, B.; Guyon, Hervé

doi:10.1016/j.anucene.2009.07.005

Cited by 6 publications

(7 citation statements)

References 1 publication

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“…The accuracy of the simulation of the reactor flux and energy spectrum was improved by utilizing more precise calculations of corrections to the Huber model. Special care was given to the dominant contribution from antineutrinos originating from β-decays of 28 Al and 56 Mn across the entire reactor heavy water tank. Due to an improved optical model in the detector simulation as well as the exploitation of the energy spectrum of 12 B events, the energy scale of the experiment underwent a reduction of uncertainty across the entire energy range and TG volume.…”

Section: Discussionmentioning

confidence: 99%

“…There can be up to 4.5 cycles per year. The single fuel element consists of 280 curved aluminium plates enclosing the fuel, arranged in a hollow cylinder of 41 cm outer and 26 cm inner diameter by 81 cm height (for further details see [27,28]). Its compactness makes it suitable for searches of short baseline oscillations.…”

Section: A the Ill Reactor Sitementioning

confidence: 99%

“…Compared to the source volume effect of antineutrinos produced by fission, the correction amounts to ðþ1.0 AE 0.3Þ% leading to an effective 27 Al capture rate of (0.346 AE 0.001) per fission. The β − -decay of 28 Al produces antineutrinos with energies as high as 2.86 MeV leading to a mean correction of −10.0% in the first 500 keV energy bin of the oscillation analysis. The next contribution, yielding a −1.0% correction, is from the capture on 55 Mn.…”

mentioning

confidence: 99%

“…Top view of the27 Alðn; γÞ28 Al reaction rate in the reactor heavy water tank, integrated over the 340 cm height, for STEREO phase-I. During STEREO phase-II, the through-going beam tube H6/H7 was absent (taken into account in the correction shown inFig.…”

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confidence: 99%

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Improved sterile neutrino constraints from the STEREO experiment with 179 days of reactor-on data

Almazán¹,

Bernard²,

Blanchet³

et al. 2020

Phys. Rev. D

120

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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.

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Section: Discussionmentioning

confidence: 99%

Section: A the Ill Reactor Sitementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Improved sterile neutrino constraints from the STEREO experiment with 179 days of reactor-on data

Almazán¹,

Bernard²,

Blanchet³

et al. 2020

Phys. Rev. D

120

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“…The RHF is designed and operated in order to extract most intense beams of cold, thermal or hot neutrons for research, in particular neutron scattering. It uses a single compact fuel element of 41 cm diameter and 80 cm height with highly enriched 235 U (enrichment of 93 %) [31]. The Stereo detector is installed at approximately 10 m from the core (center-to-center distance).…”

Section: Methodsmentioning

confidence: 99%

First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL

Almazán,

Bernard,

Blanchet

et al. 2020

Preprint

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This article reports the measurement of the 235 U-induced antineutrino spectrum shape by the Stereo experiment. 43'000 antineutrinos have been detected at about 10 m from the highly enriched core of the ILL reactor during 118 full days equivalent at nominal power. The measured IBD yield spectrum is unfolded to provide a pure 235 U spectrum in antineutrino energy. A careful study of the unfolding procedure, including a cross-validation by an independent framework, has shown that no major biases are introduced by the method. A significant local distortion is found with respect to predictions around E ν 5.3 MeV. A gaussian fit of this local excess leads to an amplitude of A = 12.1 ± 3.4% (3.5σ).

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Neutron Sources

Bermejo

Sordo

2013

Experimental Methods in the Physical Sciences

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A critical experiment at HFR of 19 March 2008

Cited by 6 publications

References 1 publication

Improved sterile neutrino constraints from the STEREO experiment with 179 days of reactor-on data

Improved sterile neutrino constraints from the STEREO experiment with 179 days of reactor-on data

First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL

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