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1. Sterile Neutrino Constraints from the STEREO Experiment with 66 Days of Reactor-On Data

Author

Almazan, H, Sanchez, P, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, Favier, J, Haser, J, Helaine, V, Kandzia, F, Kox, S, Lamblin, J, Letourneau, A, Lhuillier, D, Lindner, M, Manzanillas, L, Materna, T, Minotti, A, Montanet, F, Pessard, H, Real, J, Roca, C, Salagnac, T, Schoppmann, S, Sergeyeva, V, Soldner, T, Stutz, A, Zsoldos, S, Almazan H., Sanchez P. D. A., Bernard L., Blanchet A., Bonhomme A., Buck C., Favier J., Haser J., Helaine V., Kandzia F., Kox S., Lamblin J., Letourneau A., Lhuillier D., Lindner M., Manzanillas L., Materna T., Minotti A., Montanet F., Pessard H., Real J. -S., Roca C., Salagnac T., Schoppmann S., Sergeyeva V., Soldner T., Stutz A., Zsoldos S., Almazan, H, Sanchez, P, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, Favier, J, Haser, J, Helaine, V, Kandzia, F, Kox, S, Lamblin, J, Letourneau, A, Lhuillier, D, Lindner, M, Manzanillas, L, Materna, T, Minotti, A, Montanet, F, Pessard, H, Real, J, Roca, C, Salagnac, T, Schoppmann, S, Sergeyeva, V, Soldner, T, Stutz, A, Zsoldos, S, Almazan H., Sanchez P. D. A., Bernard L., Blanchet A., Bonhomme A., Buck C., Favier J., Haser J., Helaine V., Kandzia F., Kox S., Lamblin J., Letourneau A., Lhuillier D., Lindner M., Manzanillas L., Materna T., Minotti A., Montanet F., Pessard H., Real J. -S., Roca C., Salagnac T., Schoppmann S., Sergeyeva V., Soldner T., Stutz A., and Zsoldos S.

Abstract

The reactor antineutrino anomaly might be explained by the oscillation of reactor antineutrinos toward a sterile neutrino of eV mass. In order to explore this hypothesis, the STEREO experiment measures the antineutrino energy spectrum in six different detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this Letter, results from 66 days of reactor turned on and 138 days of reactor turned off are reported. A novel method to extract the antineutrino rates has been developed based on the distribution of the pulse shape discrimination parameter. The test of a new oscillation toward a sterile neutrino is performed by comparing ratios of cells, independent of absolute normalization and of the prediction of the reactor spectrum. The results are found to be compatible with the null oscillation hypothesis and the best fit of the reactor antineutrino anomaly is excluded at 97.5% C.L.

Published
2018

2. Sterile Neutrino Constraints from the STEREO Experiment with 66 Days of Reactor-On Data

Author

Almazan, H, Sanchez, P, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, Favier, J, Haser, J, Helaine, V, Kandzia, F, Kox, S, Lamblin, J, Letourneau, A, Lhuillier, D, Lindner, M, Manzanillas, L, Materna, T, Minotti, A, Montanet, F, Pessard, H, Real, J, Roca, C, Salagnac, T, Schoppmann, S, Sergeyeva, V, Soldner, T, Stutz, A, Zsoldos, S, Almazan H., Sanchez P. D. A., Bernard L., Blanchet A., Bonhomme A., Buck C., Favier J., Haser J., Helaine V., Kandzia F., Kox S., Lamblin J., Letourneau A., Lhuillier D., Lindner M., Manzanillas L., Materna T., Minotti A., Montanet F., Pessard H., Real J. -S., Roca C., Salagnac T., Schoppmann S., Sergeyeva V., Soldner T., Stutz A., Zsoldos S., Almazan, H, Sanchez, P, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, Favier, J, Haser, J, Helaine, V, Kandzia, F, Kox, S, Lamblin, J, Letourneau, A, Lhuillier, D, Lindner, M, Manzanillas, L, Materna, T, Minotti, A, Montanet, F, Pessard, H, Real, J, Roca, C, Salagnac, T, Schoppmann, S, Sergeyeva, V, Soldner, T, Stutz, A, Zsoldos, S, Almazan H., Sanchez P. D. A., Bernard L., Blanchet A., Bonhomme A., Buck C., Favier J., Haser J., Helaine V., Kandzia F., Kox S., Lamblin J., Letourneau A., Lhuillier D., Lindner M., Manzanillas L., Materna T., Minotti A., Montanet F., Pessard H., Real J. -S., Roca C., Salagnac T., Schoppmann S., Sergeyeva V., Soldner T., Stutz A., and Zsoldos S.

Abstract

The reactor antineutrino anomaly might be explained by the oscillation of reactor antineutrinos toward a sterile neutrino of eV mass. In order to explore this hypothesis, the STEREO experiment measures the antineutrino energy spectrum in six different detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this Letter, results from 66 days of reactor turned on and 138 days of reactor turned off are reported. A novel method to extract the antineutrino rates has been developed based on the distribution of the pulse shape discrimination parameter. The test of a new oscillation toward a sterile neutrino is performed by comparing ratios of cells, independent of absolute normalization and of the prediction of the reactor spectrum. The results are found to be compatible with the null oscillation hypothesis and the best fit of the reactor antineutrino anomaly is excluded at 97.5% C.L.

Published
2018

3. The STEREO experiment

Author

Allemandou, N, Almazan, H, Sanchez, P, Bernard, L, Bernard, C, Blanchet, A, Bonhomme, A, Bosson, G, Bourrion, O, Bouvier, J, Buck, C, Caillot, V, Chala, M, Champion, P, Charon, P, Collin, A, Contrepois, P, Coulloux, G, Desbrieres, B, Deleglise, G, Kanawati, W, Favier, J, Fuard, S, Monteiro, I, Gramlich, B, Haser, J, Helaine, V, Heusch, M, Jentschel, M, Kandzia, F, Konrad, G, Koster, U, Kox, S, Lahonde-Hamdoun, C, Lamblin, J, Letourneau, A, Lhuillier, D, Li, C, Lindner, M, Manzanillas, L, Materna, T, Meplan, O, Minotti, A, Monon, C, Montanet, F, Nunio, F, Peltier, F, Penichot, Y, Pequignot, M, Pessard, H, Piret, Y, Prono, G, Quemener, G, Real, J, Roca, C, Salagnac, T, Sergeyeva, V, Schoppmann, S, Scola, L, Scordilis, J, Soldner, T, Stutz, A, Tourres, D, Vescovi, C, Zsoldos, S, Allemandou N., Almazan H., Sanchez P. D. A., Bernard L., Bernard C., Blanchet A., Bonhomme A., Bosson G., Bourrion O., Bouvier J., Buck C., Caillot V., Chala M., Champion P., Charon P., Collin A., Contrepois P., Coulloux G., Desbrieres B., Deleglise G., Kanawati W. El., Favier J., Fuard S., Monteiro I. G., Gramlich B., Haser J., Helaine V., Heusch M., Jentschel M., Kandzia F., Konrad G., Koster U., Kox S., Lahonde-Hamdoun C., Lamblin J., Letourneau A., Lhuillier D., Li C., Lindner M., Manzanillas L., Materna T., Meplan O., Minotti A., Monon C., Montanet F., Nunio F., Peltier F., Penichot Y., Pequignot M., Pessard H., Piret Y., Prono G., Quemener G., Real J. -S., Roca C., Salagnac T., Sergeyeva V., Schoppmann S., Scola L., Scordilis J. -P., Soldner T., Stutz A., Tourres D., Vescovi C., Zsoldos S., Allemandou, N, Almazan, H, Sanchez, P, Bernard, L, Bernard, C, Blanchet, A, Bonhomme, A, Bosson, G, Bourrion, O, Bouvier, J, Buck, C, Caillot, V, Chala, M, Champion, P, Charon, P, Collin, A, Contrepois, P, Coulloux, G, Desbrieres, B, Deleglise, G, Kanawati, W, Favier, J, Fuard, S, Monteiro, I, Gramlich, B, Haser, J, Helaine, V, Heusch, M, Jentschel, M, Kandzia, F, Konrad, G, Koster, U, Kox, S, Lahonde-Hamdoun, C, Lamblin, J, Letourneau, A, Lhuillier, D, Li, C, Lindner, M, Manzanillas, L, Materna, T, Meplan, O, Minotti, A, Monon, C, Montanet, F, Nunio, F, Peltier, F, Penichot, Y, Pequignot, M, Pessard, H, Piret, Y, Prono, G, Quemener, G, Real, J, Roca, C, Salagnac, T, Sergeyeva, V, Schoppmann, S, Scola, L, Scordilis, J, Soldner, T, Stutz, A, Tourres, D, Vescovi, C, Zsoldos, S, Allemandou N., Almazan H., Sanchez P. D. A., Bernard L., Bernard C., Blanchet A., Bonhomme A., Bosson G., Bourrion O., Bouvier J., Buck C., Caillot V., Chala M., Champion P., Charon P., Collin A., Contrepois P., Coulloux G., Desbrieres B., Deleglise G., Kanawati W. El., Favier J., Fuard S., Monteiro I. G., Gramlich B., Haser J., Helaine V., Heusch M., Jentschel M., Kandzia F., Konrad G., Koster U., Kox S., Lahonde-Hamdoun C., Lamblin J., Letourneau A., Lhuillier D., Li C., Lindner M., Manzanillas L., Materna T., Meplan O., Minotti A., Monon C., Montanet F., Nunio F., Peltier F., Penichot Y., Pequignot M., Pessard H., Piret Y., Prono G., Quemener G., Real J. -S., Roca C., Salagnac T., Sergeyeva V., Schoppmann S., Scola L., Scordilis J. -P., Soldner T., Stutz A., Tourres D., Vescovi C., and Zsoldos S.

Abstract

The STEREO experiment is a very short baseline reactor antineutrino experiment aiming at testing the hypothesis of light sterile neutrinos as an explanation of the deficit of the observed neutrino interaction rate with respect to the predicted rate, known as the Reactor Antineutrino Anomaly. The detector center is located 10 m away from the compact, highly 235U enriched core of the research nuclear reactor of the Institut Laue Langevin in Grenoble, France. This paper describes the STEREO site, the detector components and associated shielding designed to suppress the external sources of background which were characterized on site. It reports the performances in terms of detector response and energy reconstruction.

Published
2018

4. The STEREO Experiment

Author

Allemandou, N., Almazán, H., Sanchez, P. del Amo, Bernard, L., Bernard, C., Blanchet, A., Bonhomme, A., Bosson, G., Bourrion, O., Bouvier, J., Buck, C., Caillot, V., Chala, M., Champion, P., Charon, P., Collin, A., Contrepois, P., Coulloux, G., Desbrières, B., Deleglise, G., Kanawati, W. El, Favier, J., Fuard, S., Monteiro, I. Gomes, Gramlich, B., Haser, J., Helaine, V., Heusch, M., Jentschel, M., Kandzia, F., Konrad, G., Köster, U., Kox, S., Lahonde-Hamdoun, C., Lamblin, J., Letourneau, A., Lhuillier, D., Li, C., Lindner, M., Manzanillas, L., Materna, T., Méplan, O., Minotti, A., Monon, C., Montanet, F., Nunio, F., Peltier, F., Penichot, Y., Pequignot, M., Pessard, H., Piret, Y., Prono, G., Quéméner, G., Real, J. -S., Roca, C., Salagnac, T., Sergeyeva, V., Schoppmann, S., Scola, L., Scordilis, J. -P., Soldner, T., Stutz, A., Tourres, D., Vescovi, C., Zsoldos, S., Allemandou, N., Almazán, H., Sanchez, P. del Amo, Bernard, L., Bernard, C., Blanchet, A., Bonhomme, A., Bosson, G., Bourrion, O., Bouvier, J., Buck, C., Caillot, V., Chala, M., Champion, P., Charon, P., Collin, A., Contrepois, P., Coulloux, G., Desbrières, B., Deleglise, G., Kanawati, W. El, Favier, J., Fuard, S., Monteiro, I. Gomes, Gramlich, B., Haser, J., Helaine, V., Heusch, M., Jentschel, M., Kandzia, F., Konrad, G., Köster, U., Kox, S., Lahonde-Hamdoun, C., Lamblin, J., Letourneau, A., Lhuillier, D., Li, C., Lindner, M., Manzanillas, L., Materna, T., Méplan, O., Minotti, A., Monon, C., Montanet, F., Nunio, F., Peltier, F., Penichot, Y., Pequignot, M., Pessard, H., Piret, Y., Prono, G., Quéméner, G., Real, J. -S., Roca, C., Salagnac, T., Sergeyeva, V., Schoppmann, S., Scola, L., Scordilis, J. -P., Soldner, T., Stutz, A., Tourres, D., Vescovi, C., and Zsoldos, S.

Abstract

The STEREO experiment is a very short baseline reactor antineutrino experiment aiming at testing the hypothesis of light sterile neutrinos as an explanation of the deficit of the observed neutrino interaction rate with respect to the predicted rate, known as the Reactor Antineutrino Anomaly. The detector center is located 10 m away from the compact, highly $^{235}$U enriched core of the research nuclear reactor of the Institut Laue Langevin in Grenoble, France. This paper describes the STEREO site, the detector components and associated shielding designed to suppress the external sources of background which were characterized on site. It reports the performances in terms of detector response and energy reconstruction., Comment: 32 pages, 17 figures

Published
2018
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5. A Revised Experimental Upper Limit on the Electric Dipole Moment of the Neutron

Author

Pendlebury, J. M., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Burghoff, M., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujic, Z. D., Harris, P. G., Helaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., May, D. J. R., Musgrave, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quemener, G., Rawlik, M., Rebreyend, D., Richardson, J. D., Ries, D., Roccia, S., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, A., Winston, O. J., Wursten, E., Zejma, J., Zsigmond, G., Pendlebury, J. M., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Burghoff, M., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujic, Z. D., Harris, P. G., Helaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., May, D. J. R., Musgrave, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quemener, G., Rawlik, M., Rebreyend, D., Richardson, J. D., Ries, D., Roccia, S., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, A., Winston, O. J., Wursten, E., Zejma, J., and Zsigmond, G.

Abstract

We present for the first time a detailed and comprehensive analysis of the experimental results that set the current world sensitivity limit on the magnitude of the electric dipole moment (EDM) of the neutron. We have extended and enhanced our earlier analysis to include recent developments in the understanding of the effects of gravity in depolarizing ultracold neutrons (UCN); an improved calculation of the spectrum of the neutrons; and conservative estimates of other possible systematic errors, which are also shown to be consistent with more recent measurements undertaken with the apparatus. We obtain a net result of $d_\mathrm{n} = -0.21 \pm 1.82 \times10^{-26}$ $e$cm, which may be interpreted as a slightly revised upper limit on the magnitude of the EDM of $3.0 \times10^{-26}$ $e$cm (90% CL) or $ 3.6 \times10^{-26}$ $e$cm (95% CL). This paper is dedicated by the remaining authors to the memory of Prof. J. Michael Pendlebury., Comment: 23 pages, 19 figures. Authorship list changed to put J.M. Pendlebury first. Other very minor edits

Published
2015
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6. Gravitational Depolarization of Ultracold Neutrons: Comparison with Data

Author

Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Fertl, M., Franke, B., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujic, Z. D., Harris, P. G., Heil, W., Helaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Musgrave, M., Naviliat-Cunic, O., Pendlebury, J. M., Piegsa, F. M., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quemener, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, A., Wursten, E., Zejma, J., Zenner, J., Zsigmond, G., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Fertl, M., Franke, B., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujic, Z. D., Harris, P. G., Heil, W., Helaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Musgrave, M., Naviliat-Cunic, O., Pendlebury, J. M., Piegsa, F. M., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quemener, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, A., Wursten, E., Zejma, J., Zenner, J., and Zsigmond, G.

Abstract

We compare the expected effects of so-called gravitationally enhanced depolarization of ultracold neutrons to measurements carried out in a spin-precession chamber exposed to a variety of vertical magnetic-field gradients. In particular, we have investigated the dependence upon these field gradients of spin depolarization rates and also of shifts in the measured neutron Larmor precession frequency. We find excellent qualitative agreement, with gravitationally enhanced depolarization accounting for several previously unexplained features in the data., Comment: 10 pages, 6 figures. Updated: section added about implications for current nEDM limit

Published
2015
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