New solar axion search using the CERN Axion Solar Telescope with He 4 filling

Arik, M.; Aune, S.; Barth, K.; Belov, A.; Bräuninger, H.; Bremer, J.; Burwitz, V.; Cantatore, Giovanni; Carmona, J. M.; Cetin, S. A.; Collar, J. I.; Da Riva, E.; Dafni, T.; Davenport, M.; Dermenev, A.; Eleftheriadis, C.; Elias, N.; Fanourakis, G.; Ferrer Ribas, E.; Galán, J.; García, J. A.; Gardikiotis, A.; Garza, J. G.; Gazis, E. N.; Geralis, T.; Georgiopoulou, E.; Giomataris, I.; Gninenko, S.; Gómez Marzoa, M.; Hasinoff, M. D.; Hoffmann, D. H. H.; Iguaz, F. J.; Irastorza, I. G.; Jacoby, J.; Jakovčić, K.; Karuza, M.; Kavuk, M.; Krčmar, M.; Kuster, M.; Lakić, B.; Laurent, J. M.; Liolios, A.; Ljubičić, A.; Luzón, G.; Neff, S.; Niinikoski, T.; Nordt, A.; Ortega, I.; Papaevangelou, T.; Pivovaroff, M. J.; Raffelt, G.; Rodríguez, A.; Rosu, M.; Ruz, J.; Savvidis, I.; Shilon, I.; Solanki, S. K.; Stewart, L.; Tomás, A.; Vafeiadis, T.; Villar, J.; Vogel, J. K.; Yildiz, S. C.; Zioutas, K.

doi:10.1103/PhysRevD.92.021101

The CERN Axion Solar Telescope (CAST) searches for a→γ conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward the Sun. Two parallel magnet bores can be filled with helium of adjustable pressure to match the x-ray refractive mass mγ to the axion search mass ma. After the vacuum phase (2003–2004), which is optimal for ma≲0.02 eV, we used He4 in 2005–2007 to cover the mass range of 0.02–0.39 eV and He3 in 2009–2011 to scan from 0.39 to 1.17 eV. After improving the detectors and shielding, we returned to He4 in 2012 to investigate a narrow ma range around 0.2 eV (“candidate setting” of our earlier search) and 0.39–0.42 eV, the upper axion mass range reachable with He4, to “cross the axion line” for the KSVZ model. We have improved the limit on the axion-photon coupling to gaγ<1.47×10−10 GeV−1 (95% C.L.), depending on the pressure settings. Since 2013, we have returned to the vacuum and aim for a significant increase in sensitivity.

Titolo:	New solar axion search using the CERN Axion Solar Telescope with He 4 filling
Autori:	Arik, M. Aune, S. Barth, K. Belov, A. Bräuninger, H. Bremer, J. Burwitz, V. CANTATORE, GIOVANNI Carmona, J. M. Cetin, S. A. Collar, J. I. Da Riva, E. Dafni, T. Davenport, M. Dermenev, A. Eleftheriadis, C. Elias, N. Fanourakis, G. Ferrer Ribas, E. Galán, J. García, J. A. (Corresponding) Gardikiotis, A. Garza, J. G. Gazis, E. N. Geralis, T. Georgiopoulou, E. Giomataris, I. Gninenko, S. Gómez Marzoa, M. Hasinoff, M. D. Hoffmann, D. H. H. Iguaz, F. J. Irastorza, I. G. Jacoby, J. Jakovčić, K. Karuza, M. Kavuk, M. Krčmar, M. Kuster, M. Lakić, B. Laurent, J. M. Liolios, A. Ljubičić, A. Luzón, G. Neff, S. Niinikoski, T. Nordt, A. Ortega, I. Papaevangelou, T. Pivovaroff, M. J. Raffelt, G. Rodríguez, A. Rosu, M. Ruz, J. Savvidis, I. Shilon, I. Solanki, S. K. Stewart, L. Tomás, A. Vafeiadis, T. Villar, J. Vogel, J. K. Yildiz, S. C. Zioutas, K. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2015
Stato di pubblicazione:	Pubblicato
Rivista:	PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY
Abstract:	The CERN Axion Solar Telescope (CAST) searches for a→γ conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward the Sun. Two parallel magnet bores can be filled with helium of adjustable pressure to match the x-ray refractive mass mγ to the axion search mass ma. After the vacuum phase (2003–2004), which is optimal for ma≲0.02 eV, we used He4 in 2005–2007 to cover the mass range of 0.02–0.39 eV and He3 in 2009–2011 to scan from 0.39 to 1.17 eV. After improving the detectors and shielding, we returned to He4 in 2012 to investigate a narrow ma range around 0.2 eV (“candidate setting” of our earlier search) and 0.39–0.42 eV, the upper axion mass range reachable with He4, to “cross the axion line” for the KSVZ model. We have improved the limit on the axion-photon coupling to gaγ<1.47×10−10 GeV−1 (95% C.L.), depending on the pressure settings. Since 2013, we have returned to the vacuum and aim for a significant increase in sensitivity.
Handle:	http://hdl.handle.net/11368/2871532
Digital Object Identifier (DOI):	http://dx.doi.org/10.1103/PhysRevD.92.021101
URL:	http://journals.aps.org/prd/issues/92/2
Appare nelle tipologie:	1.1 Articolo in Rivista

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