7 results on '"H. Bräuninger"'
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2. Search for Sub-eV Mass Solar Axions by the CERN Axion Solar Telescope withHe3Buffer Gas
- Author
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M. Arik, S. Aune, K. Barth, A. Belov, S. Borghi, H. Bräuninger, G. Cantatore, J. M. Carmona, S. A. Cetin, J. I. Collar, T. Dafni, M. Davenport, C. Eleftheriadis, N. Elias, C. Ezer, G. Fanourakis, E. Ferrer-Ribas, P. Friedrich, J. Galán, J. A. García, A. Gardikiotis, E. N. Gazis, T. Geralis, I. Giomataris, S. Gninenko, H. Gómez, E. Gruber, T. Guthörl, R. Hartmann, F. Haug, M. D. Hasinoff, D. H. H. Hoffmann, F. J. Iguaz, I. G. Irastorza, J. Jacoby, K. Jakovčić, M. Karuza, K. Königsmann, R. Kotthaus, M. Krčmar, M. Kuster, B. Lakić, J. M. Laurent, A. Liolios, A. Ljubičić, V. Lozza, G. Lutz, G. Luzón, J. Morales, T. Niinikoski, A. Nordt, T. Papaevangelou, M. J. Pivovaroff, G. Raffelt, T. Rashba, H. Riege, A. Rodríguez, M. Rosu, J. Ruz, I. Savvidis, P. S. Silva, S. K. Solanki, L. Stewart, A. Tomás, M. Tsagri, K. van Bibber, T. Vafeiadis, J. A. Villar, J. K. Vogel, S. C. Yildiz, and K. Zioutas
- Published
- 2011
- Full Text
- View/download PDF
3. First results from the CERN axion solar telescope
- Author
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Theodoros Geralis, M. Davenport, D. Kang, A. Nikolaidis, N. Goloubev, Gerhard Lutz, K. Königsmann, K. Kousouris, Peter Friedrich, Konstantin Zioutas, Biljana Lakić, L. Di Lella, G. Luzón, F.H. Heinsius, J. Morales, M. D. Hasinoff, Jakob Englhauser, C. Eleftheriadis, Georg G. Raffelt, E. Chesi, J. I. Collar, T. Papaevangelou, J. Jacoby, S. Andriamonje, A. Ortiz, H. A. Farach, T. Dafni, D. Autiero, Markus Kuster, J. Ruz, S. Cebrián, Yannis K. Semertzidis, R. J. Creswick, K. Barth, A. Morales, F. T. Avignone, H. Bräuninger, H. Riege, B. Beltrán, Pasquale D. Serpico, David Miller, A. Placci, J. M. Carmona, A. Belov, L. Stewart, R. Kotthaus, J. Franz, G. Fanourakis, I. Savvidis, L. Walckiers, H. Fischer, C. Lasseur, Efrain J. Ferrer, Milica Krčmar, J.A. Villar, Ante Ljubičić, A. Liolios, Joaquin Vieira, I. G. Irastorza, Ioannis Giomataris, M. Mutterer, M.L. Sarsa, W. Serber, S. Aune, Dieter H. H. Hoffmann, K. Zachariadou, V. Arsov, and S. Gninenko
- Subjects
Physics ,Particle physics ,Helioscope ,PVLAS ,Large Hadron Collider ,010308 nuclear & particles physics ,Physics::Instrumentation and Detectors ,Dark matter ,Astrophysics (astro-ph) ,High Energy Physics::Phenomenology ,General Physics and Astronomy ,axions ,solar telescope ,LHC ,FOS: Physical sciences ,Astrophysics ,Coupling (probability) ,01 natural sciences ,7. Clean energy ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,0103 physical sciences ,010306 general physics ,CERN Axion Solar Telescope ,Axion ,Primakoff effect ,Particle Physics - Experiment - Abstract
Hypothetical axion-like particles with a two-photon interaction would be produced in the Sun by the Primakoff process. In a laboratory magnetic field (``axion helioscope'') they would be transformed into X-rays with energies of a few keV. Using a decommissioned LHC test magnet, CAST has been running for about 6 months during 2003. The first results from the analysis of these data are presented here. No signal above background was observed, implying an upper limit to the axion-photon coupling < 1.16 10^{-10} GeV^-1 at 95% CL for m_a, Comment: 4 pages, accepted by PRL. Final version after the referees comments
- Published
- 2004
4. New Upper Limit on the Axion-Photon Coupling with an Extended CAST Run with a Xe-Based Micromegas Detector.
- Author
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Altenmüller K, Anastassopoulos V, Arguedas-Cuendis S, Aune S, Baier J, Barth K, Bräuninger H, Cantatore G, Caspers F, Castel JF, Çetin SA, Christensen F, Cogollos C, Dafni T, Davenport M, Decker TA, Desch K, Díez-Ibáñez D, Döbrich B, Ferrer-Ribas E, Fischer H, Funk W, Galán J, García JA, Gardikiotis A, Giomataris I, Golm J, Hailey CH, Hasinoff MD, Hoffmann DHH, Irastorza IG, Jacoby J, Jakobsen AC, Jakovčić K, Kaminski J, Karuza M, Kostoglou S, Krieger C, Lakić B, Laurent JM, Luzón G, Malbrunot C, Margalejo C, Maroudas M, Miceli L, Mirallas H, Navarro P, Obis L, Özbey A, Özbozduman K, Papaevangelou T, Pérez O, Pivovaroff MJ, Rosu M, Ruiz-Chóliz E, Ruz J, Schmidt S, Schumann M, Semertzidis YK, Solanki SK, Stewart L, Vafeiadis T, Vogel JK, and Zioutas K
- Abstract
Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope has been searching for solar axions via their back conversion to x-ray photons in a 9-T 10-m long magnet directed toward the Sun. We report on an extended run with the International Axion Observatory pathfinder detector, doubling the previous exposure time. The detector was operated with a xenon-based gas mixture for part of the new run, providing technical insights for future configurations. No counts were detected in the 95% signal-encircling region during the new run, while 0.75 were expected. The new data improve the axion-photon coupling limit to 5.8×10^{-11} GeV^{-1} at 95% CL (for m_{a}≲0.02 eV), the most restrictive experimental limit to date.
- Published
- 2024
- Full Text
- View/download PDF
5. Search for solar axions by the CERN axion solar telescope with 3He buffer gas: closing the hot dark matter gap.
- Author
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Arik M, Aune S, Barth K, Belov A, Borghi S, Bräuninger H, Cantatore G, Carmona JM, Cetin SA, Collar JI, Da Riva E, Dafni T, Davenport M, Eleftheriadis C, Elias N, Fanourakis G, Ferrer-Ribas E, Friedrich P, Galán J, García JA, Gardikiotis A, Garza JG, Gazis EN, Geralis T, Georgiopoulou E, Giomataris I, Gninenko S, Gómez H, Gómez Marzoa M, Gruber E, Guthörl T, Hartmann R, Hauf S, Haug F, Hasinoff MD, Hoffmann DH, Iguaz FJ, Irastorza IG, Jacoby J, Jakovčić K, Karuza M, Königsmann K, Kotthaus R, Krčmar M, Kuster M, Lakić B, Lang PM, Laurent JM, Liolios A, Ljubičić A, Luzón G, Neff S, Niinikoski T, Nordt A, Papaevangelou T, Pivovaroff MJ, Raffelt G, Riege H, Rodríguez A, Rosu M, Ruz J, Savvidis I, Shilon I, Silva PS, Solanki SK, Stewart L, Tomás A, Tsagri M, van Bibber K, Vafeiadis T, Villar J, Vogel JK, Yildiz SC, and Zioutas K
- Abstract
The CERN Axion Solar Telescope has finished its search for solar axions with (3)He buffer gas, covering the search range 0.64 eV ≲ ma ≲ 1.17 eV. This closes the gap to the cosmological hot dark matter limit and actually overlaps with it. From the absence of excess x rays when the magnet was pointing to the Sun we set a typical upper limit on the axion-photon coupling of gaγ ≲ 3.3 × 10(-10) GeV(-1) at 95% C.L., with the exact value depending on the pressure setting. Future direct solar axion searches will focus on increasing the sensitivity to smaller values of gaγ, for example by the currently discussed next generation helioscope International AXion Observatory.
- Published
- 2014
- Full Text
- View/download PDF
6. Search for sub-eV mass solar axions by the CERN Axion Solar Telescope with 3He buffer gas.
- Author
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Arik M, Aune S, Barth K, Belov A, Borghi S, Bräuninger H, Cantatore G, Carmona JM, Cetin SA, Collar JI, Dafni T, Davenport M, Eleftheriadis C, Elias N, Ezer C, Fanourakis G, Ferrer-Ribas E, Friedrich P, Galán J, García JA, Gardikiotis A, Gazis EN, Geralis T, Giomataris I, Gninenko S, Gómez H, Gruber E, Guthörl T, Hartmann R, Haug F, Hasinoff MD, Hoffmann DH, Iguaz FJ, Irastorza IG, Jacoby J, Jakovčić K, Karuza M, Königsmann K, Kotthaus R, Krčmar M, Kuster M, Lakić B, Laurent JM, Liolios A, Ljubičić A, Lozza V, Lutz G, Luzón G, Morales J, Niinikoski T, Nordt A, Papaevangelou T, Pivovaroff MJ, Raffelt G, Rashba T, Riege H, Rodríguez A, Rosu M, Ruz J, Savvidis I, Silva PS, Solanki SK, Stewart L, Tomás A, Tsagri M, van Bibber K, Vafeiadis T, Villar JA, Vogel JK, Yildiz SC, and Zioutas K
- Abstract
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using (3)He as a buffer gas. At T=1.8 K this allows for larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with (4)He. With about 1 h of data taking at each of 252 different pressure settings we have scanned the axion mass range 0.39 eV≲m(a)≲0.64 eV. From the absence of excess x rays when the magnet was pointing to the Sun we set a typical upper limit on the axion-photon coupling of g(aγ)≲2.3×10(-10) GeV(-1) at 95% C.L., the exact value depending on the pressure setting. Kim-Shifman-Vainshtein-Zakharov axions are excluded at the upper end of our mass range, the first time ever for any solar axion search. In the future we will extend our search to m(a)≲1.15 eV, comfortably overlapping with cosmological hot dark matter bounds.
- Published
- 2011
- Full Text
- View/download PDF
7. First results from the CERN axion solar telescope.
- Author
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Zioutas K, Andriamonje S, Arsov V, Aune S, Autiero D, Avignone FT, Barth K, Belov A, Beltrán B, Bräuninger H, Carmona JM, Cebrián S, Chesi E, Collar JI, Creswick R, Dafni T, Davenport M, Di Lella L, Eleftheriadis C, Englhauser J, Fanourakis G, Farach H, Ferrer E, Fischer H, Franz J, Friedrich P, Geralis T, Giomataris I, Gninenko S, Goloubev N, Hasinoff MD, Heinsius FH, Hoffmann DH, Irastorza IG, Jacoby J, Kang D, Königsmann K, Kotthaus R, Krcmar M, Kousouris K, Kuster M, Lakić B, Lasseur C, Liolios A, Ljubicić A, Lutz G, Luzón G, Miller DW, Morales A, Morales J, Mutterer M, Nikolaidis A, Ortiz A, Papaevangelou T, Placci A, Raffelt G, Ruz J, Riege H, Sarsa ML, Savvidis I, Serber W, Serpico P, Semertzidis Y, Stewart L, Vieira JD, Villar J, Walckiers L, and Zachariadou K
- Abstract
Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by the Primakoff process. In a laboratory magnetic field ("axion helioscope"), they would be transformed into x-rays with energies of a few keV. Using a decommissioned Large Hadron Collider test magnet, the CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from the analysis of these data are presented here. No signal above background was observed, implying an upper limit to the axion-photon coupling g(agamma)<1.16x10(-10) GeV-1 at 95% C.L. for m(a) less, similar 0.02 eV. This limit, assumption-free, is comparable to the limit from stellar energy-loss arguments and considerably more restrictive than any previous experiment over a broad range of axion masses.
- Published
- 2005
- Full Text
- View/download PDF
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