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  1. Article: TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection.

    Iguaz, F J / Garza, J G / Aznar, F / Castel, J F / Cebrián, S / Dafni, T / García, J A / Irastorza, I G / Lagraba, A / Luzón, G / Peiró, A

    The European physical journal. C, Particles and fields

    2016  Volume 76, Issue 10, Page(s) 529

    Abstract: If Dark Matter is made of Weakly Interacting Massive Particles (WIMPs) with masses below [Formula: see text] GeV, the corresponding nuclear recoils in mainstream WIMP experiments are of energies too close, or below, the experimental threshold. Gas Time ... ...

    Abstract If Dark Matter is made of Weakly Interacting Massive Particles (WIMPs) with masses below [Formula: see text] GeV, the corresponding nuclear recoils in mainstream WIMP experiments are of energies too close, or below, the experimental threshold. Gas Time Projection Chambers (TPCs) can be operated with a variety of target elements, offer good tracking capabilities and, on account of the amplification in gas, very low thresholds are achievable. Recent advances in electronics and in novel radiopure TPC readouts, especially micro-mesh gas structure (Micromegas), are improving the scalability and low-background prospects of gaseous TPCs. Here we present TREX-DM, a prototype to test the concept of a Micromegas-based TPC to search for low-mass WIMPs. The detector is designed to host an active mass of [Formula: see text] kg of Ar at 10 bar, or alternatively [Formula: see text] kg of Ne at 10 bar, with an energy threshold below 0.4 keVee, and is fully built with radiopure materials. We will describe the detector in detail, the results from the commissioning phase on surface, as well as a preliminary background model. The anticipated sensitivity of this technique may go beyond current experimental limits for WIMPs of masses of 2-8 GeV.
    Language English
    Publishing date 2016-09-27
    Publishing country France
    Document type Journal Article
    ZDB-ID 1459069-4
    ISSN 1434-6052 ; 1434-6044
    ISSN (online) 1434-6052
    ISSN 1434-6044
    DOI 10.1140/epjc/s10052-016-4372-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: TREX-DM

    Iguaz, F. J. / Garza, J. G. / Aznar, F. / Castel, J. F. / Cebrian, S. / Dafni, T. / Garcia, J. A. / Irastorza, I. G. / Lagraba, A. / Luzon, G. / Peiro, A.

    a low background Micromegas-based TPC for low-mass WIMP detection

    2016  

    Abstract: Dark Matter experiments are recently focusing their detection techniques in low-mass WIMPs, which requires the use of light elements and low energy threshold. In this context, we describe the TREX-DM experiment, a low background Micromegas-based TPC for ... ...

    Abstract Dark Matter experiments are recently focusing their detection techniques in low-mass WIMPs, which requires the use of light elements and low energy threshold. In this context, we describe the TREX-DM experiment, a low background Micromegas-based TPC for low-mass WIMP detection. Its main goal is the operation of an active detection mass $\sim$0.3 kg, with an energy threshold below 0.4 keVee and fully built with previously selected radiopure materials. This work describes the commissioning of the actual setup situated in a laboratory on surface and the updates needed for a possible physics run at the Canfranc Underground Laboratory (LSC) in 2016. A preliminary background model of TREX-DM is also presented, based on a Geant4 simulation, the simulation of the detector's response and two discrimination methods: a conservative muon/electron and one based on a neutron source. Based on this background model, TREX-DM could be competitive in the search for low-mass WIMPs. In particular it could be sensitive, e.g., to the low-mass WIMP interpretation of the DAMA/LIBRA and other hints in a conservative scenario.

    Comment: Proceedings of the XIV International Conference on Topics in Astroparticle and Underground Physics (TAUP 2015), 7-11 September 2015, Torino, Italy
    Keywords Physics - Instrumentation and Detectors ; High Energy Physics - Experiment
    Subject code 621
    Publishing date 2016-01-07
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Search for Dark Matter Axions with CAST-CAPP.

    Adair, C M / Altenmüller, K / Anastassopoulos, V / Arguedas Cuendis, S / Baier, J / Barth, K / Belov, A / Bozicevic, D / Bräuninger, H / Cantatore, G / Caspers, F / Castel, J F / Çetin, S A / Chung, W / Choi, H / Choi, J / Dafni, T / Davenport, M / Dermenev, A /
    Desch, K / Döbrich, B / Fischer, H / Funk, W / Galan, J / Gardikiotis, A / Gninenko, S / Golm, J / Hasinoff, M D / Hoffmann, D H H / Díez Ibáñez, D / Irastorza, I G / Jakovčić, K / Kaminski, J / Karuza, M / Krieger, C / Kutlu, Ç / Lakić, B / Laurent, J M / Lee, J / Lee, S / Luzón, G / Malbrunot, C / Margalejo, C / Maroudas, M / Miceli, L / Mirallas, H / Obis, L / Özbey, A / Özbozduman, K / Pivovaroff, M J / Rosu, M / Ruz, J / Ruiz-Chóliz, E / Schmidt, S / Schumann, M / Semertzidis, Y K / Solanki, S K / Stewart, L / Tsagris, I / Vafeiadis, T / Vogel, J K / Vretenar, M / Youn, S / Zioutas, K

    Nature communications

    2022  Volume 13, Issue 1, Page(s) 6180

    Abstract: The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in the 19.74 μeV to 22.47 μeV mass range. The detection concept follows the Sikivie haloscope principle, where Dark Matter axions convert into photons ...

    Abstract The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in the 19.74 μeV to 22.47 μeV mass range. The detection concept follows the Sikivie haloscope principle, where Dark Matter axions convert into photons within a resonator immersed in a magnetic field. The CAST-CAPP resonator is an array of four individual rectangular cavities inserted in a strong dipole magnet, phase-matched to maximize the detection sensitivity. Here we report on the data acquired for 4124 h from 2019 to 2021. Each cavity is equipped with a fast frequency tuning mechanism of 10 MHz/ min between 4.774 GHz and 5.434 GHz. In the present work, we exclude axion-photon couplings for virialized galactic axions down to g
    Language English
    Publishing date 2022-10-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-022-33913-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Micromegas-TPC operation at high pressure in xenon-trimethylamine mixtures

    Cebrián, S. / Dafni, T. / Ferrer-Ribas, E. / Giomataris, I. / Gonzalez-Diaz, D. / Gómez, H. / Herrera, D. C. / Iguaz, F. J. / Irastorza, I. G. / Luzon, G. / Rodríguez, A. / Segui, L. / Tomás, A.

    2012  

    Abstract: In this work we present a systematic study of Micromegas detectors in high pressure gaseous Xenon using trimethylamine (TMA) as quencher gas. Gas gains and energy resolutions for 22.1 keV X-rays are measured for pressures between 1 and 10 bar and various ...

    Abstract In this work we present a systematic study of Micromegas detectors in high pressure gaseous Xenon using trimethylamine (TMA) as quencher gas. Gas gains and energy resolutions for 22.1 keV X-rays are measured for pressures between 1 and 10 bar and various relative concentrations of TMA from 0.3 % to 15 %. We observe stable operation at all pressures, and a strongly enhanced gas gain, suggestive of Penning-like energy-transfer processes. The effect is present at all pressures and it is strongest at TMA concentrations ranging from 1.5 % to 3 %. Operating in this concentration range, the maximum gain reached values as high as x10^3 (x10^2) at 1 (10) bar. Besides, the energy resolution achievable for 22.1 keV X-rays is substantially better than the one previously obtained in pure Xe, going down to 7.3 % (9.6 %) FWHM for 1 (10) bar. These results are of interest for calorimetric applications of high pressure gas Xe TPCs, in particular for the search of the neutrinoless double beta decay of Xe-136. The resolutions achieved would extrapolate into 0.7 % (0.9 %) FWHM at the Qbb value of Xe-136 for 1 (10) bar.
    Keywords Physics - Instrumentation and Detectors ; Astrophysics - Instrumentation and Methods for Astrophysics ; High Energy Physics - Experiment
    Subject code 660
    Publishing date 2012-10-11
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Book ; Online: A Micromegas-based low-background x-ray detector coupled to a slumped-glass telescope for axion research

    Aznar, F. / Castel, J. / Christensen, F. E. / Dafni, T. / Decker, T. A. / Ferrer-Ribas, E. / Garcia, J. A. / Giomataris, I. / Gracia, J. G. / Hailey, C. J. / Hill, R. M. / Iguaz, F. J. / Irastorza, I. G. / Jakobsen, A. C. / Luzon, G. / Mirallas, H. / Papaevangelou, T. / Pivovaroff, M. J. / Ruz, J. /
    Vafeiadis, T. / Vogel, J. K.

    2015  

    Abstract: We report on the design, construction and operation of a low background x-ray detection line composed of a shielded Micromegas (micromesh gaseous structure) detector of the microbulk technique. The detector is made from radiopure materials and is placed ... ...

    Abstract We report on the design, construction and operation of a low background x-ray detection line composed of a shielded Micromegas (micromesh gaseous structure) detector of the microbulk technique. The detector is made from radiopure materials and is placed at the focal point of a $\sim$~5 cm diameter, 1.3 m focal-length, cone-approximation Wolter I x-ray telescope (XRT) comprised of thermally-formed (or "slumped") glass substrates deposited with multilayer coatings. The system has been conceived as a technological pathfinder for the future International Axion Observatory (IAXO), as it combines two of the techniques (optic and detector) proposed in the conceptual design of the project. It is innovative for two reasons: it is the first time an x-ray optic has been designed and fabricated specifically for axion research, and the first time a Micromegas detector has been operated with an x-ray optic. The line has been installed at one end of the CERN Axion Solar Telescope (CAST) magnet and is currently looking for solar axions. The combination of the XRT and Micromegas detector provides the best signal-to-noise ratio obtained so far by any detection system of the CAST experiment with a background rate of 5.4$\times$10$^{-3}\;$counts per hour in the energy region-of-interest and signal spot area.

    Comment: 21 pages, 16 figures
    Keywords Physics - Instrumentation and Detectors ; Astrophysics - Instrumentation and Methods for Astrophysics ; High Energy Physics - Experiment
    Subject code 621
    Publishing date 2015-09-21
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Book ; Online: Low background x-ray detection with Micromegas for axion research

    Aune, S. / Castel, J. F. / Dafni, T. / Davenport, M. / Fanourakis, G. / Ferrer-Ribas, E. / Galan, J. / Garcia, J. A. / Gardikiotis, A. / Geralis, T. / Giomataris, I. / Gomez, H. / Garza, J. G. / Herrera, D. C. / Iguaz, F. J. / Irastorza, I. G. / Jourde, D. / Luzon, G. / Mols, J. P. /
    Papaevangelou, T. / Rodriguez, A. / Ruz, J. / Segui, L. / Tomas, A. / Vafeiadis, T. / Yildiz, S. C.

    2013  

    Abstract: Axion helioscopes aim at the detection of solar axions through their conversion into x-rays in laboratory magnetic fields. The use of low background x-ray detectors is an essential component contributing to the sensitivity of these searches. Here we ... ...

    Abstract Axion helioscopes aim at the detection of solar axions through their conversion into x-rays in laboratory magnetic fields. The use of low background x-ray detectors is an essential component contributing to the sensitivity of these searches. Here we review the recent advances on Micromegas detectors used in the CERN Axion Solar Telescope (CAST) and proposed for the future International Axion Observatory (IAXO). The most recent Micromegas setups in CAST have achieved background levels of 1.5$\times10^{-6}$\ckcs, a factor of more than 100 lower than the ones obtained by the first generation of CAST detectors. This improvement is due to the development of active and passive shielding techniques, offline discrimination techniques allowed by highly granular readout patterns, as well as the use of radiopure detector components. The status of the intensive R&D to reduce the background levels will be described, including the operation of replica detectors in test benches and the detailed Geant4 simulation of the detector setup and the detector response, which has allowed the progressive understanding of background origins. The best levels currently achieved in a test setup operating in the Canfranc Underground Laboratory (LSC) are as low as $\sim10^{-7}$\ckcs, showing the good prospects of this technology for application in the future IAXO.

    Comment: 26 pages, 21 figures
    Keywords Physics - Instrumentation and Detectors ; High Energy Physics - Experiment
    Subject code 621
    Publishing date 2013-10-12
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Search for solar axions by the CERN axion solar telescope with 3He buffer gas: closing the hot dark matter gap.

    Arik, M / Aune, S / Barth, K / Belov, A / Borghi, S / Bräuninger, H / Cantatore, G / Carmona, J M / Cetin, S A / Collar, J I / Da Riva, E / Dafni, T / Davenport, M / Eleftheriadis, C / Elias, N / Fanourakis, G / Ferrer-Ribas, E / Friedrich, P / Galán, J /
    García, J A / Gardikiotis, A / Garza, J G / Gazis, E N / Geralis, T / Georgiopoulou, E / Giomataris, I / Gninenko, S / Gómez, H / Gómez Marzoa, M / Gruber, E / Guthörl, T / Hartmann, R / Hauf, S / Haug, F / Hasinoff, M D / Hoffmann, D H H / Iguaz, F J / Irastorza, I G / Jacoby, J / Jakovčić, K / Karuza, M / Königsmann, K / Kotthaus, R / Krčmar, M / Kuster, M / Lakić, B / Lang, P M / Laurent, J M / Liolios, A / Ljubičić, A / Luzón, G / Neff, S / Niinikoski, T / Nordt, A / Papaevangelou, T / Pivovaroff, M J / Raffelt, G / Riege, H / Rodríguez, A / Rosu, M / Ruz, J / Savvidis, I / Shilon, I / Silva, P S / Solanki, S K / Stewart, L / Tomás, A / Tsagri, M / van Bibber, K / Vafeiadis, T / Villar, J / Vogel, J K / Yildiz, S C / Zioutas, K

    Physical review letters

    2014  Volume 112, Issue 9, Page(s) 91302

    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 ...

    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.
    Language English
    Publishing date 2014-03-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.112.091302
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Search for sub-eV mass solar axions by the CERN Axion Solar Telescope with 3He buffer gas.

    Arik, M / Aune, S / Barth, K / Belov, A / Borghi, S / Bräuninger, H / Cantatore, G / Carmona, J M / Cetin, S A / Collar, J I / Dafni, T / Davenport, M / Eleftheriadis, C / Elias, N / Ezer, C / Fanourakis, G / Ferrer-Ribas, E / Friedrich, P / Galán, J /
    García, J A / Gardikiotis, A / Gazis, E N / Geralis, T / Giomataris, I / Gninenko, S / Gómez, H / Gruber, E / Guthörl, T / Hartmann, R / Haug, F / Hasinoff, M D / Hoffmann, D H H / Iguaz, F J / Irastorza, I G / Jacoby, J / Jakovčić, K / Karuza, M / Königsmann, K / Kotthaus, R / Krčmar, M / Kuster, M / Lakić, B / Laurent, J M / Liolios, A / Ljubičić, A / Lozza, V / Lutz, G / Luzón, G / Morales, J / Niinikoski, T / Nordt, A / Papaevangelou, T / Pivovaroff, M J / Raffelt, G / Rashba, T / Riege, H / Rodríguez, A / Rosu, M / Ruz, J / Savvidis, I / Silva, P S / Solanki, S K / Stewart, L / Tomás, A / Tsagri, M / van Bibber, K / Vafeiadis, T / Villar, J A / Vogel, J K / Yildiz, S C / Zioutas, K

    Physical review letters

    2011  Volume 107, Issue 26, Page(s) 261302

    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. ... ...

    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.
    Language English
    Publishing date 2011-12-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.107.261302
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Book ; Online: Characterization of a medium size Xe/TMA TPC instrumented with microbulk Micromegas, using low-energy $\gamma$-rays

    The NEXT collaboration / Alvarez, V. / Borges, F. I. G. M. / Carcel, S. / Castel, J. / Cebrian, S. / Cervera, A. / Conde, C. A. N. / Dafni, T. / Dias, T. H. V. T. / Diaz, J. / Egorov, M. / Esteve, R. / Evtoukhovitch, P. / Fernandes, L. M. P. / Ferrario, P. / Ferreira, A. L. / Freitas, E. D. C. / Gehman, V. M. /
    Gil, A. / Goldschmidt, A. / Gomez, H. / Gomez-Cadenas, J. J. / Gonzalez-Diaz, D. / Gutierrez, R. M. / Hauptman, J. / Morata, J. A. Hernando / Herrera, D. C. / Iguaz, F. J. / Irastorza, I. G. / Jinete, M. A. / Labarga, L. / Laing, A. / Liubarsky, I. / Lopes, J. A. M. / Lorca, D. / Losada, M. / Luzon, G. / Mari, A. / Martin-Albo, J. / Martinez, A. / Martinez-Lema, G. / Miller, T. / Moiseenko, A. / Monrabal, F. / Monteiro, C. M. B. / Mora, F. J. / Moutinho, L. M. / Vidal, J. Munoz / da Luz, H. Natal / Navarro, G. / Nebot-Guinot, M. / Nygren, D. / Oliveira, C. A. B. / Palma, R. / Perez, J. / Aparicio, J. L. Perez / Renner, J. / Ripoll, L. / Rodriguez, A. / Rodriguez, J. / Santos, F. P. / Santos, J. M. F. dos / Segui, L. / Serra, L. / Shuman, D. / Simon, A. / Sofka, C. / Sorel, M. / Toledo, J. F. / Tomas, A. / Torrent, J. / Tsamalaidze, Z. / Vazquez, D. / Veloso, J. F. C. A. / Villar, J. A. / Webb, R. C. / White, J. T. / Yahlali, N. / Aznar, F. / Calvet, D. / Druillole, F. / Ferrer-Ribas, E. / Garcia, J. A. / Giomataris, I. / Gracia, J. / Coguie, A. Le / Mols, J. P. / Pons, P. / Ruiz, E.

    2013  

    Abstract: NEXT-MM is a general-purpose high pressure (10 bar, $\sim25$ l active volume) Xenon-based TPC, read out in charge mode with an 8 cm $\times$8 cm-segmented 700 cm$^2$ plane (1152 ch) of the latest microbulk-Micromegas technology. It has been recently ... ...

    Abstract NEXT-MM is a general-purpose high pressure (10 bar, $\sim25$ l active volume) Xenon-based TPC, read out in charge mode with an 8 cm $\times$8 cm-segmented 700 cm$^2$ plane (1152 ch) of the latest microbulk-Micromegas technology. It has been recently commissioned at University of Zaragoza as part of the R&D of the NEXT $0\nu\beta\beta$ experiment, although the experiment's first stage is currently being built based on a SiPM/PMT-readout concept relying on electroluminescence. Around 2 million events were collected during the last months, stemming from the low energy $\gamma$-rays emitted by a $^{241}$Am source when interacting with the Xenon gas ($\epsilon$ = 26, 30, 59.5 keV). The localized nature of such events above atmospheric pressure, the long drift times, as well as the possibility to determine their production time from the associated $\alpha$ particle in coincidence, allow the extraction of primordial properties of the TPC filling gas, namely the drift velocity, diffusion and attachment coefficients. In this work we focus on the little explored combination of Xe and trimethylamine (TMA) for which, in particular, such properties are largely unknown. This gas mixture offers potential advantages over pure Xenon when aimed at Rare Event Searches, mainly due to its Penning characteristics, wave-length shifting properties and reduced diffusion, and it is being actively investigated by our collaboration. The chamber is currently operated at 2.7 bar, as an intermediate step towards the envisaged 10 bar. We report here its performance as well as a first implementation of the calibration procedures that have allowed the extension of the previously reported energy resolution to the whole readout plane (10.6%FWHM@30keV).

    Comment: 22 pages, 13 figures
    Keywords Physics - Instrumentation and Detectors
    Subject code 660
    Publishing date 2013-11-14
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article: First results from the CERN axion solar telescope.

    Zioutas, K / Andriamonje, S / Arsov, V / Aune, S / Autiero, D / Avignone, F T / Barth, K / Belov, A / Beltrán, B / Bräuninger, H / Carmona, J M / Cebrián, S / Chesi, E / Collar, J I / 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, M D / Heinsius, F H / Hoffmann, D H H / Irastorza, I G / 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, D W / Morales, A / Morales, J / Mutterer, M / Nikolaidis, A / Ortiz, A / Papaevangelou, T / Placci, A / Raffelt, G / Ruz, J / Riege, H / Sarsa, M L / Savvidis, I / Serber, W / Serpico, P / Semertzidis, Y / Stewart, L / Vieira, J D / Villar, J / Walckiers, L / Zachariadou, K

    Physical review letters

    2005  Volume 94, Issue 12, Page(s) 121301

    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 ... ...

    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.
    Language English
    Publishing date 2005-04-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.94.121301
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