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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
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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
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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
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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
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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
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  6. Article ; Online: Tacrine-based dual binding site acetylcholinesterase inhibitors as potential disease-modifying anti-Alzheimer drug candidates.

    Camps, Pelayo / Formosa, Xavier / Galdeano, Carles / Gómez, Tània / Muñoz-Torrero, Diego / Ramírez, Lorena / Viayna, Elisabet / Gómez, Elena / Isambert, Nicolás / Lavilla, Rodolfo / Badia, Albert / Clos, M Victòria / Bartolini, Manuela / Mancini, Francesca / Andrisano, Vincenza / Bidon-Chanal, Axel / Huertas, Oscar / Dafni, Thomai / Luque, F Javier

    Chemico-biological interactions

    2010  Volume 187, Issue 1-3, Page(s) 411–415

    Abstract: Two novel families of dual binding site acetylcholinesterase (AChE) inhibitors have been developed, consisting of a tacrine or 6-chlorotacrine unit as the active site interacting moiety, either the 5,6-dimethoxy-2-[(4-piperidinyl)methyl]-1-indanone ... ...

    Abstract Two novel families of dual binding site acetylcholinesterase (AChE) inhibitors have been developed, consisting of a tacrine or 6-chlorotacrine unit as the active site interacting moiety, either the 5,6-dimethoxy-2-[(4-piperidinyl)methyl]-1-indanone fragment of donepezil (or the indane derivative thereof) or a 5-phenylpyrano[3,2-c]quinoline system, reminiscent to the tryciclic core of propidium, as the peripheral site interacting unit, and a linker of suitable length as to allow the simultaneous binding at both sites. These hybrid compounds are all potent and selective inhibitors of human AChE, and more interestingly, are able to interfere in vitro both formation and aggregation of the beta-amyloid peptide, the latter effects endowing these compounds with the potential to modify Alzheimer's disease progression.
    MeSH term(s) Acetylcholinesterase/chemistry ; Acetylcholinesterase/metabolism ; Alzheimer Disease/drug therapy ; Alzheimer Disease/epidemiology ; Amino Acid Motifs ; Amyloid Precursor Protein Secretases/antagonists & inhibitors ; Amyloid beta-Peptides/chemistry ; Amyloid beta-Peptides/metabolism ; Aspartic Acid Endopeptidases/antagonists & inhibitors ; Catalytic Domain ; Cholinesterase Inhibitors/chemistry ; Cholinesterase Inhibitors/pharmacology ; Cholinesterase Inhibitors/therapeutic use ; Drug Discovery ; Humans ; Indans/chemistry ; Indans/pharmacology ; Indans/therapeutic use ; Models, Molecular ; Piperidines/chemistry ; Piperidines/pharmacology ; Piperidines/therapeutic use ; Protein Multimerization/drug effects ; Protein Structure, Quaternary ; Quinolines/chemistry ; Quinolines/pharmacology ; Quinolines/therapeutic use ; Tacrine/chemistry ; Tacrine/pharmacology ; Tacrine/therapeutic use
    Chemical Substances Amyloid beta-Peptides ; Cholinesterase Inhibitors ; Indans ; Piperidines ; Quinolines ; Tacrine (4VX7YNB537) ; donepezil (8SSC91326P) ; quinoline (E66400VT9R) ; Acetylcholinesterase (EC 3.1.1.7) ; Amyloid Precursor Protein Secretases (EC 3.4.-) ; Aspartic Acid Endopeptidases (EC 3.4.23.-) ; BACE1 protein, human (EC 3.4.23.46)
    Language English
    Publishing date 2010-09-06
    Publishing country Ireland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 218799-1
    ISSN 1872-7786 ; 0009-2797
    ISSN (online) 1872-7786
    ISSN 0009-2797
    DOI 10.1016/j.cbi.2010.02.013
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  7. 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
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  8. Article ; Online: Pyrano[3,2-c]quinoline-6-chlorotacrine hybrids as a novel family of acetylcholinesterase- and beta-amyloid-directed anti-Alzheimer compounds.

    Camps, Pelayo / Formosa, Xavier / Galdeano, Carles / Muñoz-Torrero, Diego / Ramírez, Lorena / Gómez, Elena / Isambert, Nicolás / Lavilla, Rodolfo / Badia, Albert / Clos, M Victòria / Bartolini, Manuela / Mancini, Francesca / Andrisano, Vincenza / Arce, Mariana P / Rodríguez-Franco, M Isabel / Huertas, Oscar / Dafni, Thomai / Luque, F Javier

    Journal of medicinal chemistry

    2009  Volume 52, Issue 17, Page(s) 5365–5379

    Abstract: Two isomeric series of dual binding site acetylcholinesterase (AChE) inhibitors have been designed, synthesized, and tested for their ability to inhibit AChE, butyrylcholinesterase, AChE-induced and self-induced beta-amyloid (Abeta) aggregation, and beta- ...

    Abstract Two isomeric series of dual binding site acetylcholinesterase (AChE) inhibitors have been designed, synthesized, and tested for their ability to inhibit AChE, butyrylcholinesterase, AChE-induced and self-induced beta-amyloid (Abeta) aggregation, and beta-secretase (BACE-1) and to cross blood-brain barrier. The new hybrids consist of a unit of 6-chlorotacrine and a multicomponent reaction-derived pyrano[3,2-c]quinoline scaffold as the active-site and peripheral-site interacting moieties, respectively, connected through an oligomethylene linker containing an amido group at variable position. Indeed, molecular modeling and kinetic studies have confirmed the dual site binding of these compounds. The new hybrids, and particularly 27, retain the potent and selective human AChE inhibitory activity of the parent 6-chlorotacrine while exhibiting a significant in vitro inhibitory activity toward the AChE-induced and self-induced Abeta aggregation and toward BACE-1, as well as ability to enter the central nervous system, which makes them promising anti-Alzheimer lead compounds.
    MeSH term(s) Acetylcholinesterase/metabolism ; Alzheimer Disease/drug therapy ; Amyloid Precursor Protein Secretases/antagonists & inhibitors ; Amyloid beta-Peptides/metabolism ; Animals ; Binding Sites ; Blood-Brain Barrier/drug effects ; Blood-Brain Barrier/metabolism ; Butyrylcholinesterase/metabolism ; Cattle ; Cholinesterase Inhibitors/chemistry ; Cholinesterase Inhibitors/metabolism ; Cholinesterase Inhibitors/pharmacology ; Cholinesterase Inhibitors/therapeutic use ; Drug Design ; Humans ; Isomerism ; Membranes, Artificial ; Mice ; Models, Molecular ; Molecular Conformation ; Permeability ; Protein Binding/drug effects ; Tacrine/analogs & derivatives ; Tacrine/chemistry ; Tacrine/metabolism ; Tacrine/pharmacology ; Tacrine/therapeutic use
    Chemical Substances 6-chlorotacrine ; Amyloid beta-Peptides ; Cholinesterase Inhibitors ; Membranes, Artificial ; Tacrine (4VX7YNB537) ; Acetylcholinesterase (EC 3.1.1.7) ; Butyrylcholinesterase (EC 3.1.1.8) ; Amyloid Precursor Protein Secretases (EC 3.4.-)
    Language English
    Publishing date 2009-09-10
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 218133-2
    ISSN 1520-4804 ; 0022-2623
    ISSN (online) 1520-4804
    ISSN 0022-2623
    DOI 10.1021/jm900859q
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  9. 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
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  10. 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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