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1. CPT and Lorentz symmetry tests with hydrogen using a novel in-beam hyperfine spectroscopy method applicable to antihydrogen experiments

Author: L. Nowak, C. Malbrunot, M.C. Simon, C. Amsler, S. Arguedas Cuendis, S. Lahs, A. Lanz, A. Nanda, M. Wiesinger, T. Wolz, and E. Widmann
Subjects: Ground-state hyperfine splitting, Hydrogen, Standard Model Extension, CPT and Lorentz violation, Rabi spectroscopy, Physics, QC1-999
Abstract: We present a Rabi-type measurement of two ground-state hydrogen hyperfine transitions performed in two opposite external magnetic field directions. This puts first constraints at the level of Image 1 on a set of coefficients of the Standard Model Extension, which were not measured by previous experiments. Moreover, we introduce a novel method, applicable to antihydrogen hyperfine spectroscopy in a beam, that determines the zero-field hyperfine transition frequency from the two transitions measured at the same magnetic field. Our value, Image 2, is in agreement with literature at a relative precision of 0.44 ppb. This is the highest precision achieved on hydrogen in a beam, improving over previous results by a factor of 6.
Published: 2024
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2. Performance of novel VUV-sensitive Silicon Photo-Multipliers for nEXO

Author: G. Gallina, Y. Guan, F. Retiere, G. Cao, A. Bolotnikov, I. Kotov, S. Rescia, A. K. Soma, T. Tsang, L. Darroch, T. Brunner, J. Bolster, J. R. Cohen, T. Pinto Franco, W. C. Gillis, H. Peltz Smalley, S. Thibado, A. Pocar, A. Bhat, A. Jamil, D. C. Moore, G. Adhikari, S. Al Kharusi, E. Angelico, I. J. Arnquist, P. Arsenault, I. Badhrees, J. Bane, V. Belov, E. P. Bernard, T. Bhatta, P. A. Breur, J. P. Brodsky, E. Brown, E. Caden, L. Cao, C. Chambers, B. Chana, S. A. Charlebois, D. Chernyak, M. Chiu, B. Cleveland, R. Collister, M. Cvitan, J. Dalmasson, T. Daniels, K. Deslandes, R. DeVoe, M. L. di Vacri, Y. Ding, M. J. Dolinski, A. Dragone, J. Echevers, B. Eckert, M. Elbeltagi, L. Fabris, W. Fairbank, J. Farine, Y. S. Fu, D. Gallacher, P. Gautam, G. Giacomini, C. Gingras, D. Goeldi, R. Gornea, G. Gratta, C. A. Hardy, S. Hedges, M. Heffner, E. Hein, J. Holt, E. W. Hoppe, J. Hößl, A. House, W. Hunt, A. Iverson, X. S. Jiang, A. Karelin, L. J. Kaufman, R. Krücken, A. Kuchenkov, K. S. Kumar, A. Larson, K. G. Leach, B. G. Lenardo, D. S. Leonard, G. Lessard, G. Li, S. Li, Z. Li, C. Licciardi, R. Lindsay, R. MacLellan, M. Mahtab, S. Majidi, C. Malbrunot, P. Margetak, P. Martel-Dion, L. Martin, J. Masbou, N. Massacret, K. McMichael, B. Mong, K. Murray, J. Nattress, C. R. Natzke, X. E. Ngwadla, J. C. Nzobadila Ondze, A. Odian, J. L. Orrell, G. S. Ortega, C. T. Overman, S. Parent, A. Perna, A. Piepke, N. Pletskova, J. F. Pratte, V. Radeka, E. Raguzin, G. J. Ramonnye, T. Rao, H. Rasiwala, K. Raymond, B. M. Rebeiro, G. Richardson, J. Ringuette, V. Riot, T. Rossignol, P. C. Rowson, L. Rudolph, R. Saldanha, S. Sangiorgio, X. Shang, F. Spadoni, V. Stekhanov, X. L. Sun, A. Tidball, T. Totev, S. Triambak, R. H. M. Tsang, O. A. Tyuka, F. Vachon, M. Vidal, S. Viel, G. Visser, M. Wagenpfeil, M. Walent, K. Wamba, Q. Wang, W. Wang, Y. Wang, M. Watts, W. Wei, L. J. Wen, U. Wichoski, S. Wilde, M. Worcester, W. H. Wu, X. Wu, L. Xie, W. Yan, H. Yang, L. Yang, O. Zeldovich, J. Zhao, and T. Ziegler
Subjects: Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract Liquid xenon time projection chambers are promising detectors to search for neutrinoless double beta decay (0 $$\nu \beta \beta $$ ν β β ), due to their response uniformity, monolithic sensitive volume, scalability to large target masses, and suitability for extremely low background operations. The nEXO collaboration has designed a tonne-scale time projection chamber that aims to search for 0 $$\nu \beta \beta $$ ν β β of $$^{136}$$ 136 Xe with projected half-life sensitivity of $$1.35\times 10^{28}$$ 1.35 × 10 28 yr. To reach this sensitivity, the design goal for nEXO is $$\le $$ ≤ 1% energy resolution at the decay Q-value ( $$2458.07\pm 0.31$$ 2458.07 ± 0.31 keV). Reaching this resolution requires the efficient collection of both the ionization and scintillation produced in the detector. The nEXO design employs Silicon Photo-Multipliers (SiPMs) to detect the vacuum ultra-violet, 175 nm scintillation light of liquid xenon. This paper reports on the characterization of the newest vacuum ultra-violet sensitive Fondazione Bruno Kessler VUVHD3 SiPMs specifically designed for nEXO, as well as new measurements on new test samples of previously characterised Hamamatsu VUV4 Multi Pixel Photon Counters (MPPCs). Various SiPM and MPPC parameters, such as dark noise, gain, direct crosstalk, correlated avalanches and photon detection efficiency were measured as a function of the applied over voltage and wavelength at liquid xenon temperature (163 K). The results from this study are used to provide updated estimates of the achievable energy resolution at the decay Q-value for the nEXO design.
Published: 2022
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3. Search for Dark Matter Axions with CAST-CAPP

Author: C. M. Adair, K. Altenmüller, V. Anastassopoulos, S. Arguedas Cuendis, J. Baier, K. Barth, A. Belov, D. Bozicevic, H. Bräuninger, G. Cantatore, F. Caspers, J. F. Castel, S. A. Çetin, W. Chung, H. Choi, J. Choi, T. Dafni, M. Davenport, A. Dermenev, K. Desch, B. Döbrich, H. Fischer, W. Funk, J. Galan, A. Gardikiotis, S. Gninenko, J. Golm, M. D. Hasinoff, D. H. H. Hoffmann, D. Díez Ibáñez, I. G. Irastorza, K. Jakovčić, J. Kaminski, M. Karuza, C. Krieger, Ç. Kutlu, B. Lakić, J. M. Laurent, J. Lee, S. Lee, G. Luzón, C. Malbrunot, C. Margalejo, M. Maroudas, L. Miceli, H. Mirallas, L. Obis, A. Özbey, K. Özbozduman, M. J. Pivovaroff, M. Rosu, J. Ruz, E. Ruiz-Chóliz, S. Schmidt, M. Schumann, Y. K. Semertzidis, S. K. Solanki, L. Stewart, I. Tsagris, T. Vafeiadis, J. K. Vogel, M. Vretenar, S. Youn, and K. Zioutas
Subjects: Science
Abstract: Haloscopes aim at detecting axions by converting them into photons using high-quality resonant cavities, where the cavity resonance should be tuned with the unknown axion mass. Here, the authors improve exclusion limits using four phase-matched resonant cavities and a fast frequency scanning technique.
Published: 2022
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4. First results of the CAST-RADES haloscope search for axions at 34.67 μeV

Author: A. Álvarez Melcón, S. Arguedas Cuendis, J. Baier, K. Barth, H. Bräuninger, S. Calatroni, G. Cantatore, F. Caspers, J. F. Castel, S. A. Cetin, C. Cogollos, T. Dafni, M. Davenport, A. Dermenev, K. Desch, A. Díaz-Morcillo, B. Döbrich, H. Fischer, W. Funk, J. D. Gallego, J. M. García Barceló, A. Gardikiotis, J. G. Garza, B. Gimeno, S. Gninenko, J. Golm, M. D. Hasinoff, D. H. H. Hoffmann, I. G. Irastorza, K. Jakovčić, J. Kaminski, M. Karuza, B. Lakić, J. M. Laurent, A. J. Lozano-Guerrero, G. Luzón, C. Malbrunot, M. Maroudas, J. Miralda-Escudé, H. Mirallas, L. Miceli, P. Navarro, A. Ozbey, K. Özbozduman, C. Peña Garay, M. J. Pivovaroff, J. Redondo, J. Ruz, E. Ruiz Chóliz, S. Schmidt, M. Schumann, Y. K. Semertzidis, S. K. Solanki, L. Stewart, I. Tsagris, T. Vafeiadis, J. K. Vogel, E. Widmann, W. Wuensch, and K. Zioutas
Subjects: Dark matter, Dark Matter and Double Beta Decay (experiments), Exotics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part of the CERN Axion Solar Telescope (CAST), searching for axion dark matter in the 34.67 μeV mass range. A radio frequency cavity consisting of 5 sub-cavities coupled by inductive irises took physics data inside the CAST dipole magnet for the first time using this filter-like haloscope geometry. An exclusion limit with a 95% credibility level on the axion-photon coupling constant of g aγ ≳ 4 × 10 −13 GeV −1 over a mass range of 34.6738 μeV < m a < 34.6771 μeV is set. This constitutes a significant improvement over the current strongest limit set by CAST at this mass and is at the same time one of the most sensitive direct searches for an axion dark matter candidate above the mass of 25 μeV. The results also demonstrate the feasibility of exploring a wider mass range around the value probed by CAST-RADES in this work using similar coherent resonant cavities.
Published: 2021
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5. Conceptual design of BabyIAXO, the intermediate stage towards the International Axion Observatory

Author: The IAXO collaboration, A. Abeln, K. Altenmüller, S. Arguedas Cuendis, E. Armengaud, D. Attié, S. Aune, S. Basso, L. Bergé, B. Biasuzzi, P. T. C. Borges De Sousa, P. Brun, N. Bykovskiy, D. Calvet, J. M. Carmona, J. F. Castel, S. Cebrián, V. Chernov, F. E. Christensen, M. M. Civitani, C. Cogollos, T. Dafní, A. Derbin, K. Desch, D. Díez, M. Dinter, B. Döbrich, I. Drachnev, A. Dudarev, L. Dumoulin, D. D. M. Ferreira, E. Ferrer-Ribas, I. Fleck, J. Galán, D. Gascón, L. Gastaldo, M. Giannotti, Y. Giomataris, A. Giuliani, S. Gninenko, J. Golm, N. Golubev, L. Hagge, J. Hahn, C. J. Hailey, D. Hengstler, P. L. Henriksen, T. Houdy, R. Iglesias-Marzoa, F. J. Iguaz, I. G. Irastorza, C. Iñiguez, K. Jakovčić, J. Kaminski, B. Kanoute, S. Karstensen, L. Kravchuk, B. Lakić, T. Lasserre, P. Laurent, O. Limousin, A. Lindner, M. Loidl, I. Lomskaya, G. López-Alegre, B. Lubsandorzhiev, K. Ludwig, G. Luzón, C. Malbrunot, C. Margalejo, A. Marin-Franch, S. Marnieros, F. Marutzky, J. Mauricio, Y. Menesguen, M. Mentink, S. Mertens, F. Mescia, J. Miralda-Escudé, H. Mirallas, J. P. Mols, V. Muratova, X. F. Navick, C. Nones, A. Notari, A. Nozik, L. Obis, C. Oriol, F. Orsini, A. Ortiz de Solórzano, S. Oster, H. P. Pais Da Silva, V. Pantuev, T. Papaevangelou, G. Pareschi, K. Perez, O. Pérez, E. Picatoste, M. J. Pivovaroff, D. V. Poda, J. Redondo, A. Ringwald, M. Rodrigues, F. Rueda-Teruel, S. Rueda-Teruel, E. Ruiz-Choliz, J. Ruz, E. O. Saemann, J. Salvado, T. Schiffer, S. Schmidt, U. Schneekloth, M. Schott, L. Segui, F. Tavecchio, H. H. J. ten Kate, I. Tkachev, S. Troitsky, D. Unger, E. Unzhakov, N. Ushakov, J. K. Vogel, D. Voronin, A. Weltman, U. Werthenbach, W. Wuensch, and A. Yanes-Díaz
Subjects: Beyond Standard Model, Dark matter, CP violation, Other experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract This article describes BabyIAXO, an intermediate experimental stage of the International Axion Observatory (IAXO), proposed to be sited at DESY. IAXO is a large-scale axion helioscope that will look for axions and axion-like particles (ALPs), produced in the Sun, with unprecedented sensitivity. BabyIAXO is conceived to test all IAXO subsystems (magnet, optics and detectors) at a relevant scale for the final system and thus serve as prototype for IAXO, but at the same time as a fully-fledged helioscope with relevant physics reach itself, and with potential for discovery. The BabyIAXO magnet will feature two 10 m long, 70 cm diameter bores, and will host two detection lines (optics and detector) of dimensions similar to the final ones foreseen for IAXO. BabyIAXO will detect or reject solar axions or ALPs with axion-photon couplings down to g aγ ∼ 1.5 × 10 −11 GeV −1, and masses up to m a ∼ 0.25 eV. BabyIAXO will offer additional opportunities for axion research in view of IAXO, like the development of precision x-ray detectors to identify particular spectral features in the solar axion spectrum, and the implementation of radiofrequency-cavity-based axion dark matter setups.
Published: 2021
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6. Scalable haloscopes for axion dark matter detection in the 30 μeV range with RADES

Author: A. Álvarez Melcón, S. Arguedas Cuendis, C. Cogollos, A. Díaz-Morcillo, B. Döbrich, J. D. Gallego, J. M. García Barceló, B. Gimeno, J. Golm, I. G. Irastorza, A. J. Lozano-Guerrero, C. Malbrunot, A. Millar, P. Navarro, C. Peña Garay, J. Redondo, and W. Wuensch
Subjects: Dark matter, Dark Matter and Double Beta Decay (experiments), Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract RADES (Relic Axion Detector Exploratory Setup) is a project with the goal of directly searching for axion dark matter above the 30μeV scale employing custom-made microwave filters in magnetic dipole fields. Currently RADES is taking data at the LHC dipole of the CAST experiment. In the long term, the RADES cavities are envisioned to take data in the BabyIAXO magnet. In this article we report on the modelling, building and characterisation of an optimised microwave-filter design with alternating irises that exploits maximal coupling to axions while being scalable in length without suffering from mode-mixing. We develop the mathematical formalism and theoretical study which justifies the performance of the chosen design. We also point towards the applicability of this formalism to optimise the MADMAX dielectric haloscopes.
Published: 2020
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7. Search for heavy neutrinos in π → μν decay

Author: A. Aguilar-Arevalo, M. Aoki, M. Blecher, D.I. Britton, D. vom Bruch, D.A. Bryman, S. Chen, J. Comfort, L. Doria, S. Cuen-Rochin, P. Gumplinger, A. Hussein, Y. Igarashi, S. Ito, S.H. Kettell, L. Kurchaninov, L.S. Littenberg, C. Malbrunot, R.E. Mischke, T. Numao, D. Protopopescu, A. Sher, T. Sullivan, and D. Vavilov
Subjects: Physics, QC1-999
Abstract: In the present work of the PIENU experiment, heavy neutrinos were sought in pion decays π+→μ+ν at rest by examining the observed muon energy spectrum for extra peaks in addition to the expected peak for a light neutrino. No evidence for heavy neutrinos was observed. Upper limits were set on the neutrino mixing matrix |Uμi|2 in the neutrino mass region of 15.7–33.8 MeV/c2, improving on previous results by an order of magnitude. Keywords: Pion decay, Heavy neutrino
Published: 2019
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8. In-beam measurement of the hydrogen hyperfine splitting and prospects for antihydrogen spectroscopy

Author: M. Diermaier, C. B. Jepsen, B. Kolbinger, C. Malbrunot, O. Massiczek, C. Sauerzopf, M. C. Simon, J. Zmeskal, and E. Widmann
Subjects: Science
Abstract: Comparing the ground-state hyperfine structure of antihydrogen to that of hydrogen will provide insights into CPT symmetry in nature. Here the authors report the most precise in-beam measurement of this quantity for hydrogen to demonstrate the viability of ASACUSA’s setup to measure it in antihydrogen.
Published: 2017
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9. Upgrade of ASACUSA's antihydrogen detector

Author: V. Kraxberger, C. Amsler, H. Breuker, S. Chesnevskaya, G. Costantini, R. Ferragut, M. Giammarchi, A. Gligorova, G. Gosta, H. Higaki, E.D. Hunter, C. Killian, V. Kletzl, N. Kuroda, A. Lanz, M. Leali, V. Mäckel, G. Maero, C. Malbrunot, V. Mascagna, Y. Matsuda, S. Migliorati, D.J. Murtagh, Y. Nagata, A. Nanda, L. Nowak, E. Pasino, M. Romé, M.C. Simon, M. Tajima, V. Toso, S. Ulmer, L. Venturelli, A. Weiser, E. Widmann, T. Wolz, Y. Yamazaki, and J. Zmeskal
Subjects: Nuclear and High Energy Physics, Antimatter, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, Data acquisition, Instrumentation and Detectors (physics.ins-det), Silicon photomultiplier, nucl-ex, High Energy Physics::Experiment, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Detectors and Experimental Techniques, Nuclear Experiment, Antihydrogen, Instrumentation, physics.ins-det
Abstract: The goal of the ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) CUSP experiment at CERN's Antiproton Decelerator is to measure the ground state hyperfine splitting of antihydrogen in order to test whether CPT invariance is broken. The ASACUSA hodoscope is a detector consisting of two layers of 32 plastic scintillator bars individually read out by two serially connected silicon photo multipliers (SiPMs) on each end. Two additional layers for position resolution along the beam axis were scintillator fibres, which will now be replaced by scintillating tiles placed onto the existing bars and also read out by SiPMs. If the antiproton of antihydrogen annihilates in the center of the hodoscope, particles (mostly pions) are produced and travel through the various layers of the detector and produce signals. The hodoscope was successfully used during the last data taking period at CERN. The necessary time resolution to discriminate between particles travelling through the detector from outside and particles produced in the center of the detector was achieved by the use of waveform digitisers and software constant fraction discrimination. The disadvantage of this readout scheme was the slow readout speed, which was improved by two orders of magnitude. This was done by omitting the digitisers and replacing them with TDCs reading out the digital time-over-threshold (ToT) signal using leading edge discrimination., Submitted to VCI2022 Proceedings in NIM A
Published: 2023

10. High-resolution MCP-TimePix3 imaging/timing detector for antimatter physics

Author: L Glöggler, R Caravita, M Auzins, B Bergmann, R S Brusa, P Burian, A Camper, F Castelli, P Cheinet, R Ciuryło, D Comparat, G Consolati, M Doser, H Gjersdal, Ł Graczykowski, F Guatieri, S Haider, S Huck, M Janik, G Kasprowicz, G Khatri, Ł Kłosowski, G Kornakov, C Malbrunot, S Mariazzi, L Nowak, D Nowicka, E Oswald, L Penasa, M Piwiński, S Pospisil, L Povolo, F Prelz, S A Rangwala, B Rienäcker, O M Røhne, H Sandaker, T Sowinski, I Stekl, D Tefelski, M Volponi, T Wolz, C Zimmer, M Zawada, and N Zurlo
Subjects: positrons, antihydrogen, timings, detector, Applied Mathematics, Settore FIS/01 - Fisica Sperimentale, resolution, Settore FIS/04 - Fisica Nucleare e Subnucleare, imagings, TimePix3, ddc:530, Detectors and Experimental Techniques, Instrumentation, Engineering (miscellaneous)
Abstract: We present a hybrid imaging/timing detector for force sensitive inertial measurements designed for measurements on positronium, the metastable bound state of an electron and a positron, but also suitable for applications involving other low intensity, low energy beams of neutral (antimatter)-atoms, such as antihydrogen. The performance of the prototype detector was evaluated with a tunable low energy positron beam, resulting in a spatial resolution of ≈ 12 mm, a detection efficiency of up to 40% and a time-resolution in the order of tens of ns.
Published: 2022

11. ELENA: Bright Perspectives for Low Energy Antiproton Physics

Author: C. Carli, D. Gamba, C. Malbrunot, L. Ponce, and S. Ulmer
Subjects: Nuclear and High Energy Physics, Particle Physics - Experiment
Abstract: Although incredibly successful, the standard model of particle physics (SM) is known to be glaringly incomplete. For example, it has so far failed in the unification of all known forces, and it inc...
Published: 2022

12. Thin film (high temperature) superconducting radiofrequency cavities for the search of axion dark matter

Author: J. Golm, S. Arguedas Cuendis, S. Calatroni, C. Cogollos, B. Dobrich, J.D. Gallego, J.M. Garcia Barcelo, X. Granados, J. Gutierrez, I.G. Irastorza, T. Koettig, N. Lamas, J. Liberadzka-Porret, C. Malbrunot, W.L. Millar, P. Navarro, C.P.A. Carlos, T. Puig, G.J. Rosaz, M. Siodlaczek, G. Telles, W. Wuensch, European Commission, European Research Council, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), European Organization for Nuclear Research, Golm, Jessica [0000-0001-9551-5848], Calatroni, Sergio [0000-0002-2769-8029], Döbrich, B. [0000-0002-6008-8601], Gallego, Juan Daniel [0000-0002-7148-5127], García Barceló, J. M. [0000-0003-3565-4189], Irastorza, Igor G. [0000-0003-1163-1687], Lamas, Neil [0000-0002-7092-2807], Malbrunot, C. [0000-0001-6193-6601], Millar, W. Lee [0000-0003-1536-2269], Rosaz, Guillaume J. [0000-0001-5987-128X], Siodlaczek, Marc [0000-0003-1410-2975], Siodlaczek, Marc [0000-0002-2620-7283], Wuensch, Walter [0000-0001-7378-5345], Golm, Jessica, Calatroni, Sergio, Döbrich, B., Gallego, Juan Daniel, García Barceló, J. M., Irastorza, Igor G., Lamas, Neil, Malbrunot, C., Millar, W. Lee, Rosaz, Guillaume J., Siodlaczek, Marc, and Wuensch, Walter
Subjects: Accelerator Physics (physics.acc-ph), Physics::Instrumentation and Detectors, 2G HTS conductors, FOS: Physical sciences, SRF superconducting radio frequency cavities, Condensed Matter Physics, Accelerators and Storage Rings, Quality factor, High Energy Physics - Experiment, Electronic, Optical and Magnetic Materials, High Energy Physics - Experiment (hep-ex), Axion, Superconducting resonators, Physics - Accelerator Physics, Electrical and Electronic Engineering, Particle Physics - Experiment
Abstract: 5 pages, 6 figures. v2: minor updates after referee comments, matches published version in IEEE, The axion is a hypothetical particle which is a candidate for cold dark matter. Haloscope experiments directly search for these particles in strong magnetic fields with RF cavities as detectors. The Relic Axion Detector Exploratory Setup (RADES) at CERN in particular is searching for axion dark matter in a mass range above 30 $\mu$eV. The figure of merit of our detector depends linearly on the quality factor of the cavity and therefore we are researching the possibility of coating our cavities with different superconducting materials to increase the quality factor. Since the experiment operates in strong magnetic fields of 11 T and more, superconductors with high critical magnetic fields are necessary. Suitable materials for this application are for example REBa$_2$Cu$_3$O$_{7-x}$, Nb$_3$Sn or NbN. We designed a microwave cavity which resonates at around 9~GHz, with a geometry optimized to facilitate superconducting coating and designed to fit in the bore of available high-field accelerator magnets at CERN. Several prototypes of this cavity were coated with different superconducting materials, employing different coating techniques. These prototypes were characterized in strong magnetic fields at 4.2 K., This project has received funding from the European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement No 730871 (ARIES-TNA). BD and JG acknowledge funding through the European Research Council under grant ERC-2018-StG-802836 (AxScale). We also acknowledge funding via the Spanish Agencia Estatal de Investigacion (AEI) and Fondo Europeo de Desarrollo Regional (FEDER) under project PID2019- 108122GB-C33, and the grant FPI BES-2017-079787 (under project FPA2016-76978-C3-2-P). Furthermore we acknowledge support from SuMaTe RTI2018-095853-B-C21 from MICINN co-financed by the European Regional Development Fund, Center of Excellence award Severo Ochoa CEX2019- 000917-S and CERN under Grant FCCGOV-CC-0208 (KE4947/ATS)., With funding from the Spanish government through the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000917-S).
Published: 2022

13. Search for three body Pion Decays π+ → l+νX in the PIENU Experiment

Author: Shintaro Ito, A. Aguilar-Arevalo, M. Aoki, M. Blecher, D.I. Britton, D. Protopopescu, S. Ito, D.A. Bryman, D.vom Bruch, S. Cuen-Rochin, C. Malbrunot, T. Sullivan, S. Chen, J. Comfort, L. Doria, P. Gumplinger, L. Kurchaninov, R.E. Mischke, T. Numao, A. Sher, D. Vavilov, A. Hussein, Y. Igarashi, S. Kettell, and L. Littenberg
Subjects: Sterile Neutrinos and New Physics
Abstract: Parallel Contributed Talk at the "XIX International Workshop on Neutrino Telescopes" on line - 18-26 February, 2021
Published: 2021
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14. Reducing the background temperature for cyclotron cooling in a cryogenic Penning–Malmberg trap

Author: C. Amsler, H. Breuker, S. Chesnevskaya, G. Costantini, R. Ferragut, M. Giammarchi, A. Gligorova, G. Gosta, H. Higaki, E. D. Hunter, C. Killian, V. Kletzl, V. Kraxberger, N. Kuroda, A. Lanz, M. Leali, V. Mäckel, G. Maero, C. Malbrunot, V. Mascagna, Y. Matsuda, S. Migliorati, D. J. Murtagh, Y. Nagata, A. Nanda, L. Nowak, E. Pasino, M. Romé, M. C. Simon, M. Tajima, V. Toso, S. Ulmer, L. Venturelli, A. Weiser, E. Widmann, T. Wolz, Y. Yamazaki, and J. Zmeskal
Subjects: Settore FIS/01 - Fisica Sperimentale, Condensed Matter Physics, Accelerators and Storage Rings, Settore FIS/03 - Fisica della Materia
Abstract: Magnetized nonneutral plasma composed of electrons or positrons couples to the local microwave environment via cyclotron radiation. The equilibrium plasma temperature depends on the microwave energy density near the cyclotron frequency. Fine copper meshes and cryogenic microwave absorbing material were used to lower the effective temperature of the radiation environment in ASACUSA's Cusp trap, resulting in significantly reduced plasma temperature.
Published: 2022

15. Conceptual design of BabyIAXO, the intermediate stage towards the International Axion Observatory

Author: S. Arguedas Cuendis, C. Oriol, J. Castel, D. Voronin, A. Abeln, Olivier Limousin, A. Marin-Franch, Sergey Troitsky, S. Cebrián, D. Gascon, D. D. M. Ferreira, C. J. Hailey, L. Gastaldo, Stefano Basso, R. Iglesias-Marzoa, T. Dafni, K. Altenmüller, L. Segui, Ulrich Werthenbach, D. Hengstler, J. Golm, J. M. Carmona, F.J. Iguaz, Maurizio Giannotti, F. Rueda-Teruel, Leonid Kravchuk, V. S. Pantuev, S. Aune, S. Rueda-Teruel, K. Ludwig, D. Calvet, Joan Mauricio, Igor Tkachev, Klaus Kurt Desch, BayarJon Paul Lubsandorzhiev, E. Ferrer-Ribas, Fabrizio Tavecchio, A. Dudarev, J. P. Mols, Andreas Ringwald, A. A. Nozik, U. Schneekloth, X. F. Navick, Javier Redondo, M. M. Civitani, N. Bykovskiy, E. O. Saemann, Nikita Ushakov, B. Döbrich, O. Pérez, Thomas Papaevangelou, A. Lindner, S. N. Gninenko, B. Kanoute, Eric Armengaud, E. Unzhakov, C. Cogollos, C. Iñiguez, Matthias Mentink, P. Borges de Sousa, Susanne Mertens, Søren Schmidt, Federico Mescia, J. Ruz, Pierre Brun, L. Dumoulin, C. Malbrunot, J. Hahn, V. Chernov, A. Ortiz de Solórzano, K. Perez, Thierry Lasserre, I. Drachnev, S. Karstensen, L. Bergé, Y. Giomataris, L. Obis, E. Picatoste, F. Marutzky, S. Oster, I. Lomskaya, Jordi Salvado, B. Biasuzzi, I. G. Irastorza, Lars Hagge, H. P. Pais Da Silva, Y. Menesguen, J. Kaminski, Walter Wuensch, G. López-Alegre, Alessio Notari, S. Marnieros, Michael J. Pivovaroff, Ivor Fleck, A. V. Derbin, P. Laurent, Finn Erland Christensen, T. Schiffer, N. Golubev, David Attié, P. L. Henriksen, C. Nones, D. Unger, M. Dinter, D.V. Poda, A. Giuliani, C. Margalejo, E. Ruiz-Choliz, Julia Vogel, G. Luzón, Amanda Weltman, T. Houdy, Krešimir Jakovčić, G. Pareschi, D. Díez, A. Yanes-Díaz, Matias Rodrigues, F. Orsini, Matthias Schott, J. Galán, V. N. Muratova, Martin Loidl, Biljana Lakić, H. Mirallas, H. H. J. ten Kate, Jordi Miralda-Escudé, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), IAXO, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), ANR-19-CE31-0024,DALPS,Déteteurs pour la recherche des particules 'axion-like'(2019), Irastorza, I. G., and IAXO Collaboration
Subjects: Physics - Instrumentation and Detectors, QC770-798, Other experiments, 01 natural sciences, High Energy Physics - Experiment, design [detector], High Energy Physics - Experiment (hep-ex), Observatory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Other experiment, Detectors and Experimental Techniques, physics.ins-det, Physics, solar [axion], Detector, Instrumentation and Detectors (physics.ins-det), CP violation, Beyond Standard Model, Dark matter, axion-like particles, Astrophysics - Instrumentation and Methods for Astrophysics, Particle Physics - Experiment, Nuclear and High Energy Physics, Particle physics, Astrophysics and Astronomy, FOS: Physical sciences, dark matter, Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Sensitivity (control systems), 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Axion, detector: design, Helioscope, axion: dark matter, 010308 nuclear & particles physics, hep-ex, DESY, IAXO, sensitivity, optics, Beyond standard model, axion: solar, dark matter [axion], astro-ph.IM
Abstract: This article describes BabyIAXO, an intermediate experimental stage of the International Axion Observatory (IAXO), proposed to be sited at DESY. IAXO is a large-scale axion helioscope that will look for axions and axion-like particles (ALPs), produced in the Sun, with unprecedented sensitivity. BabyIAXO is conceived to test all IAXO subsystems (magnet, optics and detectors) at a relevant scale for the final system and thus serve as prototype for IAXO, but at the same time as a fully-fledged helioscope with relevant physics reach itself, and with potential for discovery. The BabyIAXO magnet will feature two 10 m long, 70 cm diameter bores, and will host two detection lines (optics and detector) of dimensions similar to the final ones foreseen for IAXO. BabyIAXO will detect or reject solar axions or ALPs with axion-photon couplings down to $g_{a\gamma} \sim 1.5 \times 10^{-11}$ GeV$^{-1}$, and masses up to $m_a\sim 0.25$ eV. BabyIAXO will offer additional opportunities for axion research in view of IAXO, like the development of precision x-ray detectors to identify particular spectral features in the solar axion spectrum, and the implementation of radiofrequency-cavity-based axion dark matter setups., Comment: 77 pages, 49 figures. Prepared for submission to JHEP. Third version after referees comments
Published: 2021
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16. Search for three body pion decays π+→l+νX

Author: S. Cuen-Rochin, M. Blecher, D. Vavilov, Song Chen, Masaharu Aoki, D. Protopopescu, Y. Igarashi, L. S. Littenberg, P. Gumplinger, A. Sher, Luca Doria, C. Malbrunot, R. E. Mischke, T. Sullivan, Shintaro Ito, D. Vom Bruch, T. Numao, Dave Britton, Alexis A. Aguilar-Arevalo, S. H. Kettell, Douglas Bryman, J. R. Comfort, Leonid Kurchaninov, and Ahmed Hussein
Subjects: Physics, Crystallography, Pion, 010308 nuclear & particles physics, Branching fraction, Full data, High Energy Physics::Phenomenology, 0103 physical sciences, 010306 general physics, Coupling (probability), 01 natural sciences, Boson
Abstract: The three body pion decays π+→l+νX(l=e,μ), where X is a weakly interacting neutral boson, were searched for using the full data set from the PIENU experiment. An improved limit on Γ(π+→e+νX)/Γ(π+→μ+νμ) in the mass range 0
Published: 2021

17. Measurement of the principal quantum number distribution in a beam of antihydrogen atoms

Author: Naofumi Kuroda, C. Malbrunot, S. Arguedas Cuendis, M. Wiesinger, L. Venturelli, A. Weiser, A. Gligorova, Yasuyuki Matsuda, Hiroyuki A. Torii, M. Leali, O. Massiczek, Stefan Ulmer, M. Tajima, T. Wolz, Eberhard Widmann, M. Fleck, M. C. Simon, A. Lanz, Yasuyuki Kanai, Ulrik I. Uggerhøj, V. Kletzl, Yugo Nagata, Johann Zmeskal, A. A. Capon, V. Mascagna, D. J. Murtagh, H. Breuker, G. Costantini, A. Nanda, B. Kolbinger, C. Sauerzopf, L. Nowak, B. Radics, Hiroyuki Higaki, Claude Amsler, Yasunori Yamazaki, P. Dupre, and V. Mäckel
Subjects: Physics::General Physics, Atomic Physics (physics.atom-ph), FIELD-IONIZATION, HYDROGEN-ATOM, Other Fields of Physics, FOS: Physical sciences, physics.atom-ph, 01 natural sciences, HYPERFINE, Physics - Atomic Physics, Nuclear physics, Quantum state, 0103 physical sciences, Principal quantum number, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, 010306 general physics, Antihydrogen, Hyperfine structure, Physics, 010308 nuclear & particles physics, Atomic and Molecular Physics, and Optics, Antiproton Decelerator, Antiproton, Antimatter, CPT, Ground state
Abstract: The ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration plans to measure the ground-state hyperfine splitting of antihydrogen in a beam at the CERN Antiproton Decelerator with initial relative precision of 10-6 or better, to test the fundamental CPT (combination of charge conjugation, parity transformation and time reversal) symmetry between matter and antimatter. This challenging goal requires a polarised antihydrogen beam with a sufficient number of antihydrogen atoms in the ground state. The first measurement of the quantum state distribution of antihydrogen atoms in a low magnetic field environment of a few mT is described. Furthermore, the data-driven machine learning analysis to identify antihydrogen events is discussed., 18 pages, 10 figures
Published: 2021

18. Induced THz transitions in Rydberg caesium atoms for application in antihydrogen experiments

Author: Emiliya Dimova, Daniel Comparat, Mélissa Vieille-Grosjean, C. Malbrunot, Z. Mazzotta, T. Wolz, Laboratoire Aimé Cotton (LAC), and École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)
Subjects: CERN Lab, Atomic Physics (physics.atom-ph), Other Fields of Physics, FOS: Physical sciences, chemistry.chemical_element, 02 engineering and technology, Photoionization, physics.atom-ph, 01 natural sciences, Physics - Atomic Physics, symbols.namesake, photon: particle source, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Spontaneous emission, Physics::Atomic Physics, 010306 general physics, Antihydrogen, Physics, photon: production, antihydrogen: production, Optical physics, bibliography, binding energy, photon: energy, 021001 nanoscience & nanotechnology, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Atomic and Molecular Physics, and Optics, chemistry, atom: ground state, Excited state, Caesium, Rydberg formula, symbols, cesium: atom, atom: excited state, Atomic physics, 0210 nano-technology, Ground state
Abstract: Antihydrogen atoms are produced at CERN in highly excited Rydberg states. However, precision measurements require anti-atoms in ground state. Whereas experiments currently rely on spontaneous emission only, simulations have shown that THz light can be used to stimulate the decay towards ground state and thus increase the number of anti-atoms available for measurements. We review different possibilities at hand to generate light in the THz range required for the purpose of stimulated deexcitation. We demonstrate the effect of a blackbody type light source, which however presents drawbacks for this application including strong photoionization. Further, we report on the first THz transitions in a beam of Rydberg caesium atoms induced by photomixers and conclude with the implications of the results for the antihydrogen case.[graphic not available: see fulltext][graphic not available: see fulltext] Antihydrogen atoms are produced at CERN in highly excited Rydberg states. However, precision measurements require anti-atoms in ground state. Whereas experiments currently rely on spontaneous emission only, simulations have shown that THz light can be used to stimulate the decay towards ground state and thus increase the number of anti-atoms available for measurements. We review different possibilities at hand to generate light in the THz range required for the purpose of stimulated deexcitation. We demonstrate the effect of a blackbody type light source, which however presents drawbacks for this application including strong photoionization. Further, we report on the first THz transitions in a beam of Rydberg caesium atoms induced by photomixers and conclude with the implications of the results for the antihydrogen case.
Published: 2021

19. Simulation of antihydrogen deexcitation in neutral atom traps for improved trapping and cooling

Author: C Malbrunot, T Wolz, L Nowak, and D Comparat
Subjects: Condensed Matter::Quantum Gases, Physics in General, Physics::Atomic Physics, Condensed Matter Physics, Atomic and Molecular Physics, and Optics
Abstract: We present results of simulations highlighting the performance of a cooling mechanism in a magnetic trap tailored for excited Rydberg atoms (or molecules) with high magnetic moment. Unlike previous work, the cooling is achieved through fast stimulated decay of inter-manifold transitions which optimizes the scheme. This mechanism is relevant to experiments with trapped antihydrogen atoms for which the trapping fraction is currently low. We find several-fold enhancements of the number of atoms trapped in the configurations probed.
Published: 2022

20. Axion search with BabyIAXO in view of IAXO

Author: Pierre Brun, A. Marin-Franch, S. Aune, C. Iñiguez, G. Luzón, D. Díez, Y. Giomataris, L. Obis, Nikolai Golubev, Igor Tkachev, G. Pareschi, S. Rueda-Teruel, B. Biasuzzi, D. Unger, Marta Civitani, O. Limousin, L. Kravchuk, A. Abeln, K. Altenmüller, Walter Wuensch, Ulrich Werthenbach, Sergey Troitsky, N. Bykovskiy, J.P. Mols, Sergei Gninenko, J. Golm, L. Dumoulin, Amanda Weltman, Matthias Mentink, C. Nones, Krešimir Jakovčić, I. Lomskaya, Javier Redondo, J. Vogel, J. Ruz, I. Drachnev, M. J. Pivovaroff, D.V. Poda, Jordi Miralda-Escudé, Javier Galan, Loredana Gastaldo, T. Lasserre, C. Malbrunot, I. G. Irastorza, Lars Hagge, Nikita Ushakov, P. L. Henriksen, Joan Mauricio, D. Calvet, E. Ruiz-Choliz, V. Chernov, A. Ortiz de Solórzano, T. Papaevangelou, K. Perez, BayarJon Paul Lubsandorzhiev, S. Marnieros, R. Iglesias-Marzoa, J. F. Castel, H. P. Pais Da Silva, S. Schmidt, H. Ten Kate, S. Cebrián, Fabrizio Tavecchio, A. A. Nozik, F. J. Iguaz-Gutierrez, Finn Erland Christensen, Y. Menesguen, David Gascon, T. Schiffer, P. Laurent, V. S. Pantuev, M. R.D. Rodrigues, D. Hengstler, David Attié, C. Margalejo, J. M. Carmona, Jordi Salvado, B. Kanoute, F. Marutzky, Stefano Basso, T. Dafni, S. Arguedas Cuendis, Alexey Dudarev, C. Oriol, S. Oster, Luc Bergé, G. López-Alegre, J. Hahn, Biljana Lakić, U. Schneekloth, H. Mirallas, Maurizio Giannotti, E. Ferrer-Ribas, Charles J. Hailey, X-F. Navick, F. Rueda-Teruel, A. V. Derbin, E. O. Saemann, E. Armengaud, E. Picatoste, Federico Mescia, V. Muratova, Martin Loidl, O. Pérez, D. Voronin, P. Borges de Sousa, K. Ludwig, Klaus Kurt Desch, Babette Döbrich, S. Karstensen, D. D. M. Ferreira, L. Segui, Andreas Ringwald, C. Cogollos, A. Yanes-Díaz, Ivor Fleck, F. Orsini, A. Giuliani, Matthias Schott, Jochen Kaminski, Alessio Notari, M. Dinter, E. Unzhakov, A. Lindner, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Heidelberg University, University of Zaragoza - Universidad de Zaragoza [Zaragoza], European Organization for Nuclear Research (CERN), INAF - Osservatorio Astronomico di Brera (OAB), Istituto Nazionale di Astrofisica (INAF), Moscow Institute of Physics and Technology [Moscow] (MIPT), Danmarks Tekniske Universitet = Technical University of Denmark (DTU), Universitat de Barcelona (UB), National Research Center 'Kurchatov Institute' (NRC KI), Rheinische Friedrich-Wilhelms-Universität Bonn, Deutsches Elektronen-Synchrotron [Hamburg] (DESY), National Space Institute [Lyngby] (DTU Space), University of Siegen, Kirchhoff Institute for Physics, University of Heidelberg, Dept Phys Sci - Barry University, Barry University, Institute for Nuclear Research of Russian Academy of Sciences (INR), Russian Academy of Sciences [Moscow] (RAS), Friedrich-Schiller-Universität = Friedrich Schiller University Jena [Jena, Germany], Universität Siegen [Siegen], Kirchhoff Institute for Physics, Universität Heidelberg [Heidelberg] = Heidelberg University, Centro de Estudios de Física del Cosmos de Aragón, Rudjer Boskovic Institute [Zagreb], Laboratoire National Henri Becquerel (LNHB), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institució Catalana de Recerca i Estudis Avançats (ICREA), Massachusetts Institute of Technology (MIT), SLAC National Accelerator Laboratory (SLAC), Stanford University, Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), Lawrence Livermore National Laboratory (LLNL), University of Cape Town, IAXO collaboration, Technical University of Denmark [Lyngby] (DTU), Universität Heidelberg [Heidelberg], Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), and Johannes Gutenberg - Universität Mainz (JGU)
Subjects: Particle physics, Physics - Instrumentation and Detectors, solar axion, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], experimental methods, Dark matter, FOS: Physical sciences, 7. Clean energy, String (physics), Standard Model, axion helioscope, design [detector], International Axion Observatory (IAXO), Observatory, Peccei-Quinn mechanism, Dark Matter, detector design, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, Axion, sun-tracking systems, physics.ins-det, activity report, detector: design, Physics, instrumentation, Helioscope, Large Hadron Collider, detector, solar [axion], DESY, Instrumentation and Detectors (physics.ins-det), [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], IAXO, magnet, optics, axion: solar
Abstract: Axions are a natural consequence of the Peccei-Quinn mechanism, the most compelling solution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model, notably in string theories. Both axions and ALPs are very well motivated candidates for Dark Matter, and in addition, they would be copiously produced at the sun's core. A relevant effort during the last decade has been the CAST experiment at CERN, the most sensitive axion helioscope to-date. The International Axion Observatory (IAXO) is a large-scale 4th generation helioscope. As its primary physics goal, IAXO will look for solar axions or ALPs with a signal to background ratio of about 5 orders of magnitude higher than CAST. Recently the IAXO collaboration has proposed and intermediate experimental stage, BabyIAXO, conceived to test all IAXO subsystems (magnet, optics, detectors and sun-tracking systems) at a relevant scale for the final system and thus serve as pathfinder for IAXO but at the same time as a fully-fledged helioscope with record and relevant physics reach in itself with potential for discovery. BabyIAXO was endorsed by the Physics Review committee of DESY last May 2019. Here we will review the status and prospects of BabyIAXO and its potential to probe the most physics motivated regions of the axion & ALPs parameter space., 6 pages, ICHEP 2020 Virtual conference
Published: 2020
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21. Search for heavy neutrinos in π → μν decay

Author: T. Numao, Dave Britton, M. Blecher, A. Sher, Y. Igarashi, Douglas Bryman, P. Gumplinger, J. R. Comfort, S. Cuen-Rochin, Alexis A. Aguilar-Arevalo, Leonid Kurchaninov, Song Chen, L. S. Littenberg, Luca Doria, D. Vavilov, R. E. Mischke, Masaharu Aoki, D. Vom Bruch, S. Ito, C. Malbrunot, Ahmed Hussein, S. H. Kettell, D. Protopopescu, and T. Sullivan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Pontecorvo–Maki–Nakagawa–Sakata matrix, 01 natural sciences, lcsh:QC1-999, Pion, 0103 physical sciences, Energy spectrum, High Energy Physics::Experiment, Neutrino, Heavy neutrino, 010306 general physics, Nuclear Experiment, Order of magnitude, lcsh:Physics
Abstract: In the present work of the PIENU experiment, heavy neutrinos were sought in pion decays pi(+) -> mu(+)nu at rest by examining the observed muon energy spectrum for extra peaks in addition to the expected peak for a light neutrino. No evidence for heavy neutrinos was observed. Upper limits were set on the neutrino mixing matrix vertical bar U-mu i vertical bar(2) in the neutrino mass region of 15.7-33.8 MeV/c(2), improving on previous results by an order of magnitude. (C) 2019 The Authors. Published by Elsevier B.V.
Published: 2019

22. Antiproton beams with low energy spread for antihydrogen production

Author: Hiroyuki Higaki, Yasunori Yamazaki, M. Wiesinger, A. Nanda, M. Leali, H. Breuker, Naofumi Kuroda, B. Kolbinger, M. C. Simon, V. Mäckel, A. Lanz, A. Gligorova, Claude Amsler, V. Mascagna, D. J. Murtagh, Stefan Ulmer, Yasuyuki Kanai, L. Venturelli, C. Malbrunot, M. Fleck, C. Evans, Eberhard Widmann, Yasuyuki Matsuda, Yugo Nagata, M. Tajima, and B. Radics
Subjects: Accelerator Physics (physics.acc-ph), Physics - Instrumentation and Detectors, Beam Optics, FOS: Physical sciences, weak-beam diagnostics, 7. Clean energy, 01 natural sciences, 030218 nuclear medicine & medical imaging, Nuclear physics, Trap (computing), 03 medical and health sciences, 0302 clinical medicine, Positron, Plasma diagnostics - charged-particle spectroscopy, 0103 physical sciences, Physics::Atomic Physics, Detectors and Experimental Techniques, Adiabatic process, Antihydrogen, Instrumentation, physics.ins-det, fragment and isotope, Mathematical Physics, radioactive-beam ion sources), physics.acc-ph, Physics, Instrumentation for radioactive beams (fragmentation devices, fragment and isotope, separators incl. ISOL, isobar separators, ion and atom traps, Condensed Matter::Quantum Gases, 010308 nuclear & particles physics, Plasma, Instrumentation and Detectors (physics.ins-det), Accelerators and Storage Rings, Beamline, Antiproton, separators incl. ISOL, Physics::Accelerator Physics, Plasma diagnostics, High Energy Physics::Experiment, Physics - Accelerator Physics
Abstract: A low energy antiproton transport from the ASACUSA antiproton accumulation trap (MUSASHI trap) to the antihydrogen production trap (double cusp trap) is developed. The longitudinal antiproton energy spread after the transport line is 0.23 +- 0.02 eV, compared with 15 eV with a previous method used in 2012. This reduction is achieved by an adiabatic transport beamline with several pulse-driven coaxial coils. Antihydrogen atoms are synthesized by directly injecting the antiprotons into a positron plasma, resulting in the higher production rate., 10 pages, 9 figures
Published: 2019

23. Efficient 2 S 3 positronium production by stimulated decay from the 3

Author: M. Antonello, A. Belov, G. Bonomi, R. S. Brusa, M. Caccia, A. Camper, R. Caravita, F. Castelli, G. Cerchiari, D. Comparat, G. Consolati, A. Demetrio, L. Di Noto, M. Doser, M. Fanì, S. Gerber, A. Gligorova, F. Guatieri, P. Hackstock, S. Haider, A. Hinterberger, A. Kellerbauer, O. Khalidova, D. Krasnický, V. Lagomarsino, P. Lebrun, C. Malbrunot, S. Mariazzi, V. Matveev, S. R. Müller, G. Nebbia, P
Published: 2019
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24. Velocity-selected production of 2 S 3 metastable positronium

Author: C. Amsler, M. Antonello, A. Belov, G. Bonomi, R. S. Brusa, M. Caccia, A. Camper, R. Caravita, F. Castelli, G. Cerchiari, D. Comparat, G. Consolati, A. Demetrio, L. Di Noto, M. Doser, M. Fanì, S. Gerber, A. Gligorova, F. Guatieri, P. Hackstock, S. Haider, A. Hinterberger, H. Holmestad, A. Kellerbauer, O. Khalidova, D. Krasnický, V. Lagomarsino, P. Lansonneur, P. Lebrun, C. Malbrunot, and S. Mariazzi
Published: 2019
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25. Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric fields

Author: Fabrizio Castelli, Giovanni Consolati, F. Sorrentino, Ole Røhne, F. Prelz, E. Widmann, P. Hackstock, D. Krasnický, J. Marton, Rafael Ferragut, G. Nebbia, Daniel Comparat, V. Petracek, M. Fanì, A. Kellerbauer, I. C. Tietje, A. Hinterberger, A. Gligorova, P. Nedelec, J. Robert, M. Vujanovic, S. Haider, Johann Zmeskal, Sebastian Gerber, D. Pagano, C. Zimmer, Luca Penasa, L. Smestad, V. N. Matveev, P. Lansonneur, F. Guatieri, Markus K. Oberthaler, B. Rienaecker, Marco Prevedelli, M. Antonello, Claude Amsler, Ruggero Caravita, A. Rotondi, J. Fesel, O. Khalidova, A. Camper, R. S. Brusa, A. Fontana, Heidi Sandaker, M. Doser, Z. Mazzotta, Marco Giammarchi, A. Demetrio, C. Evans, G. Bonomi, Giovanni Cerchiari, C. Malbrunot, A. S. Belov, L. Di Noto, Massimo Caccia, H. Holmestad, N. Zurlo, P. Yzombard, V. Lagomarsino, P. Lebrun, S.R. Müller, S. Aghion, Romualdo Santoro, S. Mariazzi, and G. Testera
Subjects: Physics, education.field_of_study, Population, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Positronium, law.invention, Magnetic field, law, Electric field, Metastability, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics, 0210 nano-technology, education, Excitation
Abstract: Producing positronium (Ps) in the metastable 23S state is of interest for various applications in fundamental physics. We report here on an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay of Ps excited to the 33P level manifold. The Ps cloud excitation is obtained with a UV laser pulse in an experimental vacuum chamber in presence of guiding magnetic field of 25mT and an average electric field of 300Vcm−1. The evidence of the 23S state production is obtained to the 3.6σ level of statistical significance using a novel analysis technique of the single-shot positronium annihilation lifetime spectra. The dynamic of the Ps population on the involved levels has been studied with a rate equation model.
Published: 2018

26. Antiproton tagging and vertex fitting in a Timepix3 detector

Author: Johann Zmeskal, L. Di Noto, Sebastian Gerber, P. Lansonneur, D. Pagano, V. Petracek, V. N. Matveev, F. Guatieri, C. Malbrunot, O. Khalidova, Ruggero Caravita, A. Rotondi, H. Holmestad, A. S. Belov, R. S. Brusa, Daniel Comparat, A. Gligorova, Massimo Caccia, A. Kellerbauer, Giovanni Cerchiari, Marco Prevedelli, M. Antonello, Heidi Sandaker, I. C. Tietje, F. Sorrentino, G. Bonomi, A. Camper, G. Testera, Claude Amsler, P. Nedelec, M. Doser, Fabrizio Castelli, Ph. Hackstock, F. Prelz, A. Hinterberger, Marco Giammarchi, S. Haider, S.R. Müller, J. Robert, A. Demetrio, L. Smestad, C. Evans, S. Aghion, N. Zurlo, G. Nebbia, Luca Penasa, P. Yzombard, A. Fontana, C. Zimmer, M. Fanì, Romualdo Santoro, S. Mariazzi, J. Fesel, J. Marton, P. Lebrun, V. Lagomarsino, Ole Røhne, Giovanni Consolati, D. Krasnický, Markus K. Oberthaler, B. Rienaecker, E. Widmann, Rafael Ferragut, Nicola Pacifico, Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AEgIS, Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Aghion, S., Amsler, C., Antonello, M., Belov, A., Bonomi, G., Brusa, R.S., Caccia, M., Camper, A., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Noto, L. Di, Doser, M., Evans, C., Fanì, M., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Hackstock, Ph., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Marton, J., Matveev, V., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Rienaecker, B., Robert, J., Røhne, O.M., Rotondi, A., Sandaker, H., Santoro, R., Smestad, L., Sorrentino, F., Testera, G., Tietje, I.C., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., and Zurlo, N.
Subjects: Vertex (graph theory), Physics::Instrumentation and Detectors, 01 natural sciences, Particle identification methods, Physics::Atomic Physics, Detectors and Experimental Techniques, Nuclear Experiment, Instrumentation, Image resolution, Mathematical Physics, media_common, Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc), Physics, Detector, Simulation methods and program, Hybrid detectors, Simulation methods and programs, interac- tion of photons with matter, interaction of photons with matter, Detector modelling and simulations I, interaction of hadrons with matter, force: gravitation, readout, asymmetry, Particle physics, Physics::General Physics, CERN Lab, media_common.quotation_subject, antihydrogen: annihilation, Detector modelling and simulations I (interaction of radiation with matter, Asymmetry, anti-p p: annihilation, Particle identification method, 0103 physical sciences, detector: pixel, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Antihydrogen, spatial resolution, etc), antihydrogen, detector: position sensitive, 010308 nuclear & particles physics, Hybrid detector, interaction of radiation with matter, efficiency, Antiproton, High Energy Physics::Experiment
Abstract: International audience; Studies of antimatter are important for understanding our universe at a fundamental level. There are still unsolved problems, such as the matter-antimatter asymmetry in the universe. The AEgIS experiment at CERN aims at measuring the gravitational fall of antihydrogen in order to determine the gravitational force on antimatter. The proposed method will make use of a position-sensitive detector to measure the annihilation point of antihydrogen. Such a detector must be able to tag the antiproton, measure its time of arrival and reconstruct its annihilation point with high precision in the vertical direction. This work explores a new method for tagging antiprotons and reconstructing their annihilation point. Antiprotons from the Antiproton Decelerator at CERN were used to obtain data on direct annihilations on the surface of a silicon pixel sensor with Timepix3 readout. These data were used to develop and verify a detector response model for annihilation of antiprotons in this detector. Using this model and the antiproton data it is shown that a tagging efficiency of 50± 10% and a vertical position resolution of 22 ± 0.5 μm can be obtained.
Published: 2018

27. Improved search for heavy neutrinos in the decay π→eν

Author: L. S. Littenberg, Song Chen, Douglas Bryman, P. Gumplinger, S. H. Kettell, R. E. Mischke, D. Protopopescu, Ahmed Hussein, Y. Igarashi, J. R. Comfort, C. Malbrunot, Alexis A. Aguilar-Arevalo, D. Vom Bruch, S. Ito, D. Vavilov, Leonid Kurchaninov, M. Blecher, Masaharu Aoki, A. Sher, Luca Doria, T. Sullivan, T. Numao, Dave Britton, and S. Cuen-Rochin
Subjects: Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Spectrum (functional analysis), Pontecorvo–Maki–Nakagawa–Sakata matrix, 01 natural sciences, Spectral line, Positron energy, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, Neutrino, 010306 general physics, Order of magnitude
Abstract: A search for massive neutrinos has been made in the decay π+→e+ν. No evidence was found for extra peaks in the positron energy spectrum indicative of pion decays involving massive neutrinos (π→e+νh). Upper limits (90% C.L.) on the neutrino mixing matrix element |Uei|2 in the neutrino mass region 60–135 MeV/c2 were set and are an order of magnitude improvement over previous results.
Published: 2018

28. AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam

Author: Giovanni Consolati, F. Sorrentino, J. Marton, H. Holmestad, M. Fanì, A. Kellerbauer, F. Prelz, Heidi Sandaker, Ole Røhne, O. Khalidova, Daniel Comparat, Massimo Caccia, G. Nebbia, R. S. Brusa, C. Malbrunot, I. C. Tietje, Marco Prevedelli, N. Zurlo, P. Yzombard, D. Krasnický, P. Nedelec, Z. Mazzotta, V. Petracek, G. Testera, P. Lebrun, J. Fesel, Fabrizio Castelli, L. Di Noto, Johann Zmeskal, G. Bonomi, E. Widmann, Rafael Ferragut, Claude Amsler, D. Pagano, S. Haider, V. Lagomarsino, A. Gligorova, S.R. Müller, Marco Giammarchi, S. Aghion, J. Robert, Romualdo Santoro, S. Mariazzi, Nicola Pacifico, Luca Penasa, A. Demetrio, C. Zimmer, C. Evans, Giovanni Cerchiari, Ruggero Caravita, P. Lansonneur, Markus K. Oberthaler, B. Rienaecker, A. Hinterberger, L. Smestad, A. Fontana, M. Doser, Sebastian Gerber, V. N. Matveev, F. Guatieri, A. Rotondi, Doser, M., Aghion, S., Amsler, C., Bonomi, G., Brusa, R.S., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Consolati, G., Demetrio, A., Di Noto, L., Evans, C., Fanì, M., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnický, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Marton, J., Matveev, V., Mazzotta, Z., Müller, S.R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Rienaecker, B., Robert, J., Røhne, O.M., Rotondi, A., Sandaker, H., Santoro, R., Smestad, L., Sorrentino, F., Testera, G., Tietje, I.C., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., Zurlo, N., Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: General Physics and Astronomy, Antiproton, magnetic field, Positronium, 01 natural sciences, 010305 fluids & plasmas, antihydrogen: formation, antimatter, Physics::Atomic Physics, Physics, antihydrogen, antiprotons, positrons, positronium, Large Hadron Collider, atom, General Engineering, Articles, antihydrogen, antiprotons, positronium, positrons, charge exchange, pulsed, anti-p, Antimatter, force: gravitation, gravitation: acceleration, Rydberg formula, symbols, Physics::General Physics, CERN Lab, General Mathematics, interferometer, Positron, antihydrogen: beam, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, symbols.namesake, 0103 physical sciences, Physics::Atomic and Molecular Clusters, positronium: excited state, 010306 general physics, Antihydrogen, detector: position sensitive, gravitation: interaction, antihydrogen: production, ground state: hyperfine structure, Antiproton Decelerator, Automatic Keywords, Beam (structure)
Abstract: The efficient production of cold antihydrogen atoms in particle traps at CERN’s Antiproton Decelerator has opened up the possibility of performing direct measurements of the Earth’s gravitational acceleration on purely antimatter bodies. The goal of the AEgIS collaboration is to measure the value of g for antimatter using a pulsed source of cold antihydrogen and a Moiré deflectometer/Talbot–Lau interferometer. The same antihydrogen beam is also very well suited to measuring precisely the ground-state hyperfine splitting of the anti-atom. The antihydrogen formation mechanism chosen by AEgIS is resonant charge exchange between cold antiprotons and Rydberg positronium. A series of technical developments regarding positrons and positronium (Ps formation in a dedicated room-temperature target, spectroscopy of the n =1–3 and n =3–15 transitions in Ps, Ps formation in a target at 10 K inside the 1 T magnetic field of the experiment) as well as antiprotons (high-efficiency trapping of , radial compression to sub-millimetre radii of mixed plasmas in 1 T field, high-efficiency transfer of to the antihydrogen production trap using an in-flight launch and recapture procedure) were successfully implemented. Two further critical steps that are germane mainly to charge exchange formation of antihydrogen—cooling of antiprotons and formation of a beam of antihydrogen—are being addressed in parallel. The coming of ELENA will allow, in the very near future, the number of trappable antiprotons to be increased by more than a factor of 50. For the antihydrogen production scheme chosen by AEgIS, this will be reflected in a corresponding increase of produced antihydrogen atoms, leading to a significant reduction of measurement times and providing a path towards high-precision measurements. This article is part of the Theo Murphy meeting issue ‘Antiproton physics in the ELENA era’.
Published: 2018
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29. Compression of a mixed antiproton and electron non-neutral plasma to high densities

Author: E. Widmann, Rafael Ferragut, Marco Giammarchi, M. Doser, A. Gligorova, J. Marton, S. Haider, Z. Mazzotta, P. Lansonneur, A. Hinterberger, Nicola Pacifico, Giovanni Consolati, Ole Røhne, A. Fontana, Markus K. Oberthaler, B. Rienaecker, O. Khalidova, P. Lebrun, L. Smestad, J. Fesel, V. Petracek, R. S. Brusa, D. Krasnický, P. Nedelec, J. Robert, Ruggero Caravita, Heidi Sandaker, Johann Zmeskal, H. Holmestad, D. Pagano, V. Lagomarsino, Claude Amsler, C. Malbrunot, S.R. Müller, N. Zurlo, Lea Di Noto, P. Yzombard, S. Aghion, C. Zimmer, Romualdo Santoro, S. Mariazzi, G. Testera, M. Fanì, Fabrizio Castelli, Marco Prevedelli, M. Antonello, G. Nebbia, Daniel Comparat, I. C. Tietje, F. Sorrentino, F. Prelz, Luca Penasa, A. Kellerbauer, Sebastian Gerber, V. N. Matveev, F. Guatieri, Giovanni Cerchiari, A. Rotondi, A. Demetrio, C. Evans, G. Bonomi, Massimo Caccia, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Aghion, Stefano, Amsler, Claude, Bonomi, Germano, Brusa, Roberto S., Caccia, Massimo, Caravita, Ruggero, Castelli, Fabrizio, Cerchiari, Giovanni, Comparat, Daniel, Consolati, Giovanni, Demetrio, Andrea, Di Noto, Lea, Doser, Michael, Evans, Craig, Fanì, Mattia, Ferragut, Rafael, Fesel, Julian, Fontana, Andrea, Gerber, Sebastian, Giammarchi, Marco, Gligorova, Angela, Guatieri, Francesco, Haider, Stefan, Hinterberger, Alexander, Holmestad, Helga, Kellerbauer, Alban, Khalidova, Olga, Krasnický, Daniel, Lagomarsino, Vittorio, Lansonneur, Pierre, Lebrun, Patrice, Malbrunot, Chloé, Mariazzi, Sebastiano, Marton, Johann, Matveev, Victor, Mazzotta, Zeudi, Müller, Simon R., Nebbia, Giancarlo, Nedelec, Patrick, Oberthaler, Marku, Pacifico, Nicola, Pagano, Davide, Penasa, Luca, Petracek, Vojtech, Prelz, Francesco, Prevedelli, Marco, Rienaecker, Benjamin, Robert, Jacque, Røhne, Ole M., Rotondi, Alberto, Sandaker, Heidi, Santoro, Romualdo, Smestad, Lillian, Sorrentino, Fiodor, Testera, Gemma, Tietje, Ingmari C., Widmann, Eberhard, Yzombard, Pauline, Zimmer, Christian, Zmeskal, Johann, Zurlo, Nicola, Antonello, Massimiliano, École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Electron density, Antiparticle, experimental methods, CERN Lab, Penning trap, Context (language use), Electron, gravity, antimatter, trapped particles, 01 natural sciences, electron: density, 010305 fluids & plasmas, antiproton trapping, Penning–Malmberg trap, Nuclear physics, anti-p: density, density: spatial distribution, Physics in General, Atomic and Molecular Physics, 0103 physical sciences, Physics::Atomic Physics, 010306 general physics, Antihydrogen, Nuclear Experiment, Physics, Plasma Physics, antihydrogen: production, electron: cloud, imaging, Plasma, electron: plasma, Atomic and Molecular Physics, and Optics, anti-p: plasma, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Antiproton, efficiency, Antimatter, Physics::Accelerator Physics, High Energy Physics::Experiment, and Optics
Abstract: Abstract We describe a multi-step “rotating wall” compression of a mixed cold antiproton–electron non-neutral plasma in a 4.46 T Penning–Malmberg trap developed in the context of the AEḡIS experiment at CERN. Such traps are routinely used for the preparation of cold antiprotons suitable for antihydrogen production. A tenfold antiproton radius compression has been achieved, with a minimum antiproton radius of only 0.17 mm. We describe the experimental conditions necessary to perform such a compression: minimizing the tails of the electron density distribution is paramount to ensure that the antiproton density distribution follows that of the electrons. Such electron density tails are remnants of rotating wall compression and in many cases can remain unnoticed. We observe that the compression dynamics for a pure electron plasma behaves the same way as that of a mixed antiproton and electron plasma. Thanks to this optimized compression method and the high single shot antiproton catching efficiency, we observe for the first time cold and dense non-neutral antiproton plasmas with particle densities n ≥ 1013 m−3, which pave the way for an efficient pulsed antihydrogen production in AEḡIS. Graphical abstract
Published: 2018

30. Detector for measuring the π+→e+νe branching fraction

Author: Koji Yamada, S. Ito, A. Sher, P. Gumplinger, Minoru Yoshida, R. E. Mischke, T. Numao, D. Vom Bruch, T. Sullivan, Leonid Kurchaninov, S. Cuen-Rochin, K. Tauchi, G. Sheffer, S. H. Kettell, M. Blecher, L. S. Littenberg, A. Muroi, J. R. Comfort, Y. Igarashi, D. Vavilov, Luca Doria, Masaharu Aoki, Alexis A. Aguilar-Arevalo, C. Malbrunot, Douglas Bryman, Ahmed Hussein, and N. Ito
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Branching fraction, Scintillator, 01 natural sciences, Nuclear physics, Momentum, Crystal, Pion, Positron, 0103 physical sciences, Atomic physics, Decay product, 010306 general physics, Instrumentation
Abstract: The PIENU experiment at TRIUMF is aimed at a measurement of the branching ratio R e / μ = Γ ( ( π + → e + ν e ) + ( π + → e + ν e γ ) ) / Γ ( ( π + → μ + ν μ ) + ( π + → μ + ν μ γ ) ) with precision 0.1 % . Incident pions, delivered at the rate of 60 kHz with momentum 75 MeV/c, were degraded and stopped in a plastic scintillator target. Pions and their decay product positrons were detected with plastic scintillators and tracked with multiwire proportional chambers and silicon strip detectors. The energies of the positrons were measured in a spectrometer consisting of a large NaI(Tl) crystal surrounded by an array of pure CsI crystals. This paper provides a description of the PIENU experimental apparatus and its performance in pursuit of R e / μ .
Published: 2015

31. A moiré deflectometer for antimatter

Author: Markus K. Oberthaler, M. Kimura, S. Di Domizio, Marco Giammarchi, N. Pacifico, Marco Prevedelli, P. Nedelec, C. Pistillo, F. Prelz, Ruggero Caravita, Alban Kellerbauer, P. Genova, O. Ahlén, G. Nebbia, L. Cabaret, Viktor Matveev, Simone Cialdi, F. Moia, Paola Scampoli, James William Storey, M. A. Subieta Vasquez, E. Jordan, P. Bräunig, Carlo Canali, Daniel Comparat, G. Testera, T. Huse, Thomas Kaltenbacher, A. S. Belov, Sebastiano Mariazzi, R. S. Brusa, Claude Amsler, R. Vaccarone, Vojtech Petracek, Akitaka Ariga, S. N. Gninenko, Sebastian Lehner, Giovanni Cerchiari, Fabrizio Castelli, A. Knecht, C. Malbrunot, Angela Gligorova, Sandra Zavatarelli, Michael Doser, Antonio Ereditato, Giovanni Consolati, Germano Bonomi, M. Spacek, Johann Zmeskal, Adriano Fontana, D. Krasnický, Karl Berggren, Stefano Aghion, H. Derking, C. Regenfus, J. Bremer, Alexey Dudarev, Ole Røhne, A. Magnani, Tomoko Ariga, Jiro Kawada, L. Di Noto, Rafael Ferragut, S. Haider, Eberhard Widmann, V. Lagomarsino, Alberto Rotondi, L. V. Jørgensen, Heidi Sandaker, C. Riccardi, Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AEGIS, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), S., Aghion, O., Ahl?n, C., Amsler, A., Ariga, T., Ariga, A. S., Belov, K., Berggren, G., Bonomi, P., Br?unig, J., Bremer, R. S., Brusa, L., Cabaret, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, H., Derking, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Haider, T., Huse, E., Jordan, L. V., J?rgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, A., Knecht, D., Krasnick?, V., Lagomarsino, S., Lehner, A., Magnani, C., Malbrunot, S., Mariazzi, V. A., Matveev, F., Moia, G., Nebbia, P., N?d?lec, M. K., Oberthaler, N., Pacifico, V., Petr??ek, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., R?hne, A., Rotondi, H., Sandaker, Scampoli, Paola, J., Storey, M. A., Subieta Vasquez, M., ?pa?ek, G., Testera, R., Vaccarone, E., Widmann, S., Zavatarelli, J., Zmeskal, S. Aghion, O. Ahlén, C. Amsler, A. Ariga, T. Ariga, A. S. Belov, K. Berggren, G. Bonomi, P. Bräunig, J. Bremer, R. S. Brusa, L. Cabaret, C. Canali, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, H. Derking, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, A. Ereditato, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, A. Gligorova, S. N. Gninenko, S. Haider, T. Huse, E. Jordan, L. V. Jørgensen, T. Kaltenbacher, J. Kawada, A. Kellerbauer, M. Kimura, A. Knecht, D. Krasnický, V. Lagomarsino, S. Lehner, A. Magnani, C. Malbrunot, S. Mariazzi, V. A. Matveev, F. Moia, G. Nebbia, P. Nédélec, M. K. Oberthaler, N. Pacifico, V. Petràček, C. Pistillo, F. Prelz, M. Prevedelli, C. Regenfu, C. Riccardi, O. Røhne, A. Rotondi, H. Sandaker, P. Scampoli, J. Storey, M.A. Subieta Vasquez, M. Špaček, G. Testera, R. Vaccarone, E. Widmann, S. Zavatarelli, and J. Zmeskal
Subjects: Physics::General Physics, 530 Physics, General Physics and Astronomy, Context (language use), Gravitational acceleration, 01 natural sciences, 7. Clean energy, Article, General Biochemistry, Genetics and Molecular Biology, Nuclear physics, Acceleration, 0103 physical sciences, antimatter, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Equivalence principle, 010306 general physics, Antihydrogen, Physics, Multidisciplinary, 010308 nuclear & particles physics, Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], General Chemistry, Computational physics, Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP], Deflection (physics), gravitation, Antiproton, Antimatter, PARTICLE PHYSICS, Particle Physics - Experiment
Abstract: The precise measurement of forces is one way to obtain deep insight into the fundamental interactions present in nature. In the context of neutral antimatter, the gravitational interaction is of high interest, potentially revealing new forces that violate the weak equivalence principle. Here we report on a successful extension of a tool from atom optics—the moiré deflectometer—for a measurement of the acceleration of slow antiprotons. The setup consists of two identical transmission gratings and a spatially resolving emulsion detector for antiproton annihilations. Absolute referencing of the observed antimatter pattern with a photon pattern experiencing no deflection allows the direct inference of forces present. The concept is also straightforwardly applicable to antihydrogen measurements as pursued by the AEgIS collaboration. The combination of these very different techniques from high energy and atomic physics opens a very promising route to the direct detection of the gravitational acceleration of neutral antimatter., Measuring forces on antimatter is vital to testing our understanding of fundamental physics. Towards this aim, Aghion et al. present a method to measure the deflection of antiprotons based on an atom optical tool, the moiré deflectometer, which could be extended to future antihydrogen gravity measurements.
Published: 2014

32. Towards the first measurement of matter-antimatter gravitational interaction

Author: Giovanni Consolati, Heidi Sandaker, A. Kellerbauer, D. Krasnický, S. Haider, L. Di Noto, Z. Mazzotta, P. Lebrun, Giovanni Cerchiari, Daniel Comparat, Markus K. Oberthaler, Massimo Caccia, P. Nedelec, E. Widmann, Rafael Ferragut, G. Testera, G. Bonomi, B. Rienaecker, A. Fontana, C. Malbrunot, L. Ravelli, I. C. Tietje, V. Lagomarsino, Fabrizio Castelli, C. Zimmer, G. Nebbia, F. Sorrentino, Sebastian Gerber, S.R. Müller, O. Khalidova, Luca Penasa, Ruggero Caravita, V. N. Matveev, M. Doser, S. Aghion, Marco Prevedelli, F. Guatieri, R. S. Brusa, Claude Amsler, Marco Giammarchi, A. Hinterberger, Romualdo Santoro, S. Mariazzi, A. Demetrio, C. Evans, J. Fesel, P. Lansonneur, F. Prelz, M. Fanì, L. Smestad, J. Robert, A. Rotondi, A. Gligorova, H. Holmestad, N. Zurlo, P. Yzombard, Nicola Pacifico, J. Marton, Ole Røhne, V. Petracek, Johann Zmeskal, D. Pagano, Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics::General Physics, experimental methods, geometry, CERN Lab, electric field: gradient, QC1-999, deflection, 02 engineering and technology, Gravitational acceleration, 7. Clean energy, 01 natural sciences, antihydrogen: acceleration, Nuclear physics, Gravitation, Physics and Astronomy (all), Gravitational field, 0103 physical sciences, Physics::Atomic and Molecular Clusters, antimatter, Physics::Atomic Physics, Equivalence principle, positronium: excited state, 010306 general physics, Antihydrogen, Physics, General Relativity and Cosmology, detector: position sensitive, atom, gravitation: interaction, 021001 nanoscience & nanotechnology, charge exchange, anti-p, experimental equipment, Deflection (physics), equivalence principle, Antiproton, Antimatter, gravitation: acceleration, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], 0210 nano-technology, experimental results
Abstract: International audience; The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment with the central aim to measure directly the gravitational acceleration of antihydrogen. Antihydrogen atoms will be produced via charge exchange reactions which will consist of Rydberg-excited positronium atoms sent to cooled antiprotons within an electromagnetic trap. The resulting Rydberg antihydrogen atoms will then be horizontally accelerated by an electric field gradient (Stark effect), they will then pass through a moiré deflectometer. The vertical deflection caused by the Earth's gravitational field will test for the first time the Weak Equivalence Principle for antimatter. Detection will be undertaken via a position sensitive detector. Around $10^3$ antihydrogen atoms are needed for the gravitational measurement to be completed. The present status, current achievements and results will be presented, with special attention toward the laser excitation of positronium (Ps) to the $n=3$ state and the production of Ps atoms in the transmission geometry.
Published: 2017

33. Positronium for Antihydrogen Production in the AEGIS Experiment

Author: Heidi Sandaker, G. Nebbia, Eberhard Widmann, V. Lagomarsino, Sebastian Gerber, Z. Mazzotta, S.R. Müller, Markus K. Oberthaler, Romualdo Santoro, M. Fanì, F. Guatieri, B. Rienaecker, Alban Kellerbauer, P. Yzombard, Alberto Rotondi, Sebastiano Mariazzi, L. Di Noto, A. Hinterberger, Ole Røhne, A. Demetrio, Claude Amsler, Daniel Comparat, Giovanni Consolati, C. Evans, L. Smestad, Germano Bonomi, Massimo Caccia, Johann Marton, Nicola Zurlo, Rafael Ferragut, Andrea Fontana, V. Petráček, Nicola Pacifico, C. Malbrunot, Ruggero Caravita, O. Khalidova, D. Krasnicky, Felice Sorrentino, V. A. Matveev, Marco Giammarchi, P. Lansonneur, F. Prelz, Stefano Aghion, R. S. Brusa, J. Fesel, Patrick Nedelec, Johann Zmeskal, Giovanni Cerchiari, Luca Penasa, Marco Prevedelli, H. Holmestad, I. C. Tietje, S. Haider, G. Testera, Fabrizio Castelli, Michael Doser, Angela Gligorova, P. Lebrun, J. Robert, L. Ravelli, Davide Pagano, C. Zimmer, Laboratoire Aimé Cotton (LAC), École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Consolati, G., Aghion, S., Amsler, C., Bonomi, G., Brusa, R. S., Caccia, M., Caravita, R., Castelli, F., Cerchiari, G., Comparat, D., Demetrio, A., Di Noto, L., Doser, M., Evans, C., Fanì, M., Ferragut, R., Fesel, J., Fontana, A., Gerber, S., Giammarchi, M., Gligorova, A., Guatieri, F., Haider, S., Hinterberger, A., Holmestad, H., Kellerbauer, A., Khalidova, O., Krasnicky, D., Lagomarsino, V., Lansonneur, P., Lebrun, P., Malbrunot, C., Mariazzi, S., Marton, J., Matveev, V., Mazzotta, Z., Müller, S. R., Nebbia, G., Nedelec, P., Oberthaler, M., Pacifico, N., Pagano, D., Penasa, L., Petracek, V., Prelz, F., Prevedelli, M., Ravelli, L., Rienaecker, B., Robert, J., Røhne, O. M., Rotondi, A., Sandaker, H., Santoro, R., Smestad, L., Sorrentino, F., Testera, G., Tietje, I. C., Widmann, E., Yzombard, P., Zimmer, C., Zmeskal, J., and Zurlo, N.
Subjects: Physics::General Physics, experimental methods, CERN Lab, talk: Lublin 2017/08/28, General Physics and Astronomy, anti-p: acceleration, Gravitational acceleration, 7. Clean energy, 01 natural sciences, anti-p p: annihilation, Nuclear physics, symbols.namesake, Physics and Astronomy (all), 0103 physical sciences, antimatter, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Atomic Physics, positronium: excited state, anti-p: beam, 010306 general physics, Antihydrogen, Physics, 010308 nuclear & particles physics, antihydrogen: production, Antiproton Decelerator, positronium: target, Antiproton, Antimatter, Excited state, gravitation: acceleration, Rydberg formula, symbols, proposed experiment, Rydberg state, gravity, antimatter, Particle Physics - Experiment
Abstract: International audience; The primary goal of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEGIS) collaboration is to measure for the first time precisely the gravitational acceleration of antihydrogen, H¯ , a fundamental issue of contemporary physics, using a beam of antiatoms. Indeed, although indirect arguments have been raised against a different acceleration of antimatter with respect to matter, nevertheless some attempts to formulate quantum theories of gravity, or to unify gravity with the other forces, consider the possibility of a non-identical gravitational interaction between matter and antimatter. We plan to generate H¯ through a charge-exchange reaction between excited Ps and antiprotons coming from the Antiproton Decelerator facility at CERN. It offers the advantage to produce sufficiently cold antihydrogen to make feasible a measurement of gravitational acceleration with reasonable uncertainty (of the order of a few percent). Since the cross-section of the above reaction increases with n 4 , n being the principal quantum number of Ps, it is essential to generate Ps in a highly excited (Rydberg) state. This will occur by means of two laser excitations of Ps emitted from a nanoporous silica target: a first UV laser (at 205 nm) will bring Ps from the ground to the n = 3 state; a second laser pulse (tunable in the range 1650–1700 nm) will further excite Ps to the Rydberg state.
Published: 2017
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34. Initial results from the PIENU experiment

Author: Tristan Sullivan, T. Sullivan, A. Aguilar-Arevalo, M. Aoki, M. Blecher, D.I Britton, D.A Bryman, D. vom Bruch, S. Chen, J. Comfort, S. Cuen-Rochin, L. Doria, P. Gumplinger, A. Hussein, Y. Igarashi, S. Ito, S.H Kettell, L. Kurchaninov, L.S Littenberg, C. Malbrunot, R.E Mischke, T. Numao, D. Protopopescu, A. Sher, and D. Vavilov
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Physics beyond the Standard Model, High Energy Physics::Phenomenology, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Physical and Theoretical Chemistry, 010306 general physics, Particle Physics - Experiment, Lepton
Abstract: The pion branching ratio, $R_{\pi } = \frac { {\Gamma }(\pi ^{+} \rightarrow e^{+} \nu _{e} + \pi ^{+}\rightarrow e^{+} \nu _{e} \gamma )}{\Gamma (\pi ^{+} \rightarrow \mu ^{+} \nu _{\mu } + \pi ^{+} \rightarrow \mu ^{+} \nu _{\mu } \gamma )}$ , provides a sensitive test of lepton universality and constraints on many new physics scenarios. The theoretical uncertainty on the Standard Model prediction of R π is 0.02 %, a factor of twenty smaller than the experimental uncertainty. The analysis of a subset of data taken by the PIENU experiment will be presented. The result, R π = (1.2344 ± 0.0023(s t a t) ± 0.0019(s y s t)) ⋅ 10−4 [1], is consistent with the Standard Model prediction and represents a 0.1 % constraint on lepton non-universality.
Published: 2017

35. Measuring GBAR with emulsion detector

Author: S. N. Gninenko, Jiro Kawada, L. Di Noto, P. Genova, Alexey Dudarev, Eberhard Widmann, V. Lagomarsino, F. Prelz, V. Petráček, Giovanni Consolati, Germano Bonomi, Akitaka Ariga, Paola Scampoli, M. A. Subieta Vasquez, M. Spacek, Patrick Nedelec, Heidi Sandaker, Johann Zmeskal, O. Ahlén, A. Rotondi, Claude Amsler, Marco Prevedelli, Ole Røhne, Daniel Comparat, Giovanni Cerchiari, N. Pacifico, H. Derking, Stefano Aghion, C. Pistillo, L. V. Jørgensen, Ruggero Caravita, Adriano Fontana, Simone Cialdi, E. Jordan, M. Kimura, L. Cabaret, T. Huse, J. Bremer, A. S. Belov, Tomoko Ariga, Rafael Ferragut, Cristina Riccardi, T. Kaltenbacher, Carlo Canali, Antonio Ereditato, Sebastian Lehner, C. Regenfus, P. Bräunig, M. Oberthaler, Angela Gligorova, P. Yzombard, G. Testera, D. Krasniký, S. Haider, R. S. Brusa, Karl Berggren, Fabrizio Castelli, Alice Magnani, Michael Doser, Viktor Matveev, J. Storet, S. Di Domizio, Marco Giammarchi, Alban Kellerbauer, G. Nebbia, C. Malbrunot, Sebastiano Mariazzi, A. Knecht, S. Zavaterelli, T., Ariga, S., Aghion, O., Ahl?n, C., Amsler, A., Ariga, A. S., Belov, K., Berggren, G., Bonomi, P., Br?unig, J., Bremer, R. S., Brusa, L., Cabaret, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, H., Derking, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Haider, T., Huse, E., Jordan, L. V., J?rgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, A., Knecht, D., Krasnik?, V., Lagomarsino, S., Lehner, A., Magnani, C., Malbrunot, S., Mariazzi, V. A., Matveev, G., Nebbia, P., N?d?lec, M. K., Oberthaler, N., Pacifico, V., Petr??ek, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., R?hne, A., Rotondi, H., Sandaker, Scampoli, Paola, J., Storet, M. A., Subieta Vasquez, M., ?pa?ek, G., Testera, E., Widmann, P., Yzombard, S., Zavaterelli, J., Zmeskal, AEGIS, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Aimé Cotton (LAC), and École normale supérieure - Cachan (ENS Cachan)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Particle physics, Antimatter, Annihilation, Physics::Instrumentation and Detectors, Position resolution, 530 Physics, Detector, Gravitational acceleration, Vertex (geometry), gravity, Nuclear physics, particle tracking detectors, emulsion detectors, Emulsion, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Antihydrogen, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), ComputingMilieux_MISCELLANEOUS
Abstract: The motivation of the AEgIS experiment is to test the universality of free fall with antimatter. The goal is to reach a relative uncertainty of 1% for the measurement of the earth's gravitational acceleration [Formula: see text] on an antihydrogen beam. High vertex position resolution is required for a position detector. An emulsion based detector can measure the annihilation vertex of antihydrogen atoms with a resolution of 1-2 μm, which if realized in the actual experiment will enable a 1% measurement of [Formula: see text] with less than 1000 [Formula: see text] atoms. Developments and achievements on emulsion detectors for the AEgIS experiment are presented here.
Published: 2014

36. Measuring g with Aegis, Progress and Perspectives

Author: D. Krasnick?, S. Aghion, O. Ahl?n, C. Amsler, A. Ariga, T. Ariga, A. S. Belov, K. Berggren, G. Bonomi, P. Br?unig, J. Bremer, R. S. Brusa, L. Cabaret, C. Canali, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, H. Derking, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, A. Ereditato, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, A. Gligorova, S. N. Gninenko, S. Haider, T. Huse, E. Jordan, L. V. J?rgensen, T. Kaltenbacher, J. Kawada, A. Kellerbauer, M. Kimura, A. Knecht, V. Lagomarsino, S. Lehner, A. Magnani, C. Malbrunot, S. Mariazzi, V. A. Matveev, G. Nebbia, P. N?d?lec, M. K. Oberthaler, N. Pacifico, V. Petr??ek, C. Pistillo, F. Prelz, M. Prevedelli, C. Regenfus, C. Riccardi, O. R?hne, A. Rotondi, H. Sandaker, J. Storey, M. A. Subieta Vasquez, M. ?pa?ek, G. Testera, E. Widmann, P. Yzombard, S. Zavatarelli, J. Zmeskal, SCAMPOLI, PAOLA, D., Krasnick?, S., Aghion, O., Ahl?n, C., Amsler, A., Ariga, T., Ariga, A. S., Belov, K., Berggren, G., Bonomi, P., Br?unig, J., Bremer, R. S., Brusa, L., Cabaret, C., Canali, R., Caravita, F., Castelli, G., Cerchiari, S., Cialdi, D., Comparat, G., Consolati, H., Derking, S., Di Domizio, L., Di Noto, M., Doser, A., Dudarev, A., Ereditato, R., Ferragut, A., Fontana, P., Genova, M., Giammarchi, A., Gligorova, S. N., Gninenko, S., Haider, T., Huse, E., Jordan, L. V., J?rgensen, T., Kaltenbacher, J., Kawada, A., Kellerbauer, M., Kimura, A., Knecht, V., Lagomarsino, S., Lehner, A., Magnani, C., Malbrunot, S., Mariazzi, V. A., Matveev, G., Nebbia, P., N?d?lec, M. K., Oberthaler, N., Pacifico, V., Petr??ek, C., Pistillo, F., Prelz, M., Prevedelli, C., Regenfu, C., Riccardi, O., R?hne, A., Rotondi, H., Sandaker, Scampoli, Paola, J., Storey, M. A., Subieta Vasquez, M., ?pa?ek, G., Testera, E., Widmann, P., Yzombard, S., Zavatarelli, and J., Zmeskal
Abstract: AE¯gIS experiment’s main goal is to measure the local gravitational acceleration of antihydrogen ¯g and thus perform a direct test of the weak equivalence principle with antimatter. In the first phase of the experiment the aim is to measure ¯g with 1% relative precision. This paper presents the antihydrogen production method and a description of some components of the experiment, which are necessary for the gravity measurement. Current status of the AE¯gIS experimental apparatus is presented and recent commissioning results with antiprotons are outlined. In conclusion we discuss the short-term goals of the AE¯gIS collaboration that will pave the way for the first gravity measurement in the near future.
Published: 2014

37. Comparison of Planar and 3D Silicon Pixel Sensors Used for Detection of Low Energy Antiprotons

Author: A. Gligorova, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, J. H. Derking, C. Da Via, S. Di Domizio, L. Di Noto, S. Aghion, M. Doser, A. Dudarev, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, S. N. Gninenko, S. Haider, H. Holmestad, T. Huse, A. S. Belov, E. Jordan, T. Kaltenbacher, A. Kellerbauer, A. Knecht, D. Krasnicky, V. Lagomarsino, S. Lehner, A. Magnani, C. Malbrunot, S. Mariazzi, G. Bonomi, V. A. Matveev, F. Moia, C. Nellist, G. Nebbia, P. Nedelec, M. Oberthaler, N. Pacifico, V. Petracek, F. Prelz, M. Prevedelli, P. Braunig, C. Riccardi, O. Rohne, A. Rotondi, H. Sandaker, M. A. Subieta Vasquez, M. Spacek, G. Testera, E. Widmann, P. Yzombard, S. Zavatarelli, J. Bremer, J. Zmeskal, R. S. Brusa, L. Cabaret, M. Caccia, A. Gligorova, S. Aghion, A. S. Belov, G. Bonomi, P. Braunig, J. Bremer, R. S. Brusa, L. Cabaret, M. Caccia, R. Caravita, F. Castelli, G. Cerchiari, S. Cialdi, D. Comparat, G. Consolati, J. H. Derking, C. Da Via, S. Di Domizio, L. Di Noto, M. Doser, A. Dudarev, R. Ferragut, A. Fontana, P. Genova, M. Giammarchi, S. N. Gninenko, S. Haider, H. Holmestad, T. Huse, E. Jordan, T. Kaltenbacher, A. Kellerbauer, A. Knecht, D. Krasnicky, V. Lagomarsino, S. Lehner, A. Magnani, C. Malbrunot, S. Mariazzi, V. A. Matveev, F. Moia, C. Nellist, G. Nebbia, P. Nedelec, M. Oberthaler, N. Pacifico, V. Petracek, F. Prelz, M. Prevedelli, C. Riccardi, O. Rohne, A. Rotondi, H. Sandaker, M. A. Subieta Vasquez, M. Spacek, G. Testera, E. Widmann, P. Yzombard, S. Zavatarelli, J. Zmeskal, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and AEGIS
Subjects: Nuclear and High Energy Physics, Silicon, Physics::Instrumentation and Detectors, Annihilation, antiproton, Silicon pixel sensor, chemistry.chemical_element, Annihilation, Gravitational acceleration, 7. Clean energy, Silicon pixel sensor, Nuclear physics, Optics, Gravitational field, antiproton, Nuclear Energy and Engineering, Electrical and Electronic Engineering, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Antihydrogen, Physics, CMOS sensor, business.industry, Detector, GRAVITATION, chemistry, Antiproton, Antimatter, High Energy Physics::Experiment, business, PARTICLE DETECTORS
Abstract: International audience; The principal aim of the AEgIS experiment at CERN is to measure the acceleration of antihydrogen due to Earth's gravitational field. This would be a test of the Weak Equivalence Principle, which states that all bodies fall with the same acceleration independently of their mass and composition. The effect of Earth's gravitational field on antimatter will be determined by measuring the deflection of the path of the antihydrogen from a straight line. The position of the antihydrogen will be found by detecting its annihilation on the surface of a silicon detector. The gravitational measurement in AEgIS will be performed with a gravity module, which includes the silicon detector, an emulsion detector and a scintillating fibre time-of-flight detector. As the experiment attempts to determine the gravitational acceleration with a precision of 1%, a position resolution better than 10 μm is required. Here we present the results of a study of antiproton annihilations in a 3D silicon pixel sensor and compare the results with a previous study using a monolithic active pixel sensor. This work is part of a larger study on different silicon sensor technologies needed for the development of a silicon position detector for the AEgIS experiment. The 3D detector together with its readout electronics have been originally designed for the ATLAS detector at the LHC. The direct annihilation of low energy antiprotons ( ~ 100 keV) takes place in the first few μm of the silicon sensor and we show that the charged products of the annihilation can be detected with the same sensor. The present study also aims to understand the signature of an antiproton annihilation event in segmented silicon detectors and compares it with a GEANT4 simulation model. These results will be used to determine the geometrical and process parameters to be adopted by the silicon annihilation detector to be installed in AEgIS.
Published: 2014

38. The ASACUSA CUSP: an antihydrogen experiment

Author: N. Kuroda, S. Ulmer, D. J. Murtagh, S. Van Gorp, Y. Nagata, M. Diermaier, S. Federmann, M. Leali, C. Malbrunot, V. Mascagna, O. Massiczek, K. Michishio, T. Mizutani, A. Mohri, H. Nagahama, M. Ohtsuka, B. Radics, S. Sakurai, C. Sauerzopf, K. Suzuki, M. Tajima, H. A. Torii, L. Venturelli, B. Wünschek, J. Zmeskal, N. Zurlo, H. Higaki, Y. Kanai, E. Lodi Rizzini, Y. Nagashima, Y. Matsuda, E. Widmann, and Y. Yamazaki
Published: 2015

39. Study of a large NaI(Tl) crystal

Author: L. Littenberg, T. Numao, K. Yamada, C. Malbrunot, Leonid Kurchaninov, S. Kettell, R. Poutissou, Luca Doria, M. Blecher, Glenn M. Marshall, Alexis A. Aguilar-Arevalo, Ahmed Hussein, Douglas Bryman, Masaharu Aoki, A. Sher, P. Gumplinger, and N. Ito
Subjects: Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Calorimeter (particle physics), 010308 nuclear & particles physics, Positron beam, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Crystal, Nuclear physics, High Energy Physics - Experiment (hep-ex), Narrow band, Low energy, 0103 physical sciences, Energy spectrum, Physics::Accelerator Physics, Atomic physics, 010306 general physics, Instrumentation
Abstract: Using a narrow band positron beam, the response of a large high-resolution NaI(Tl) crystal to an incident positron beam was measured. It was found that nuclear interactions cause the appearance of additional peaks in the low energy tail of the deposited energy spectrum.
Published: 2010

40. Gestion des risques liés aux légionelles dans un centre hospitalier multisites : retour d’expérience de plus de six années

Author: R. Beauvais, D. Breton, L. Crine, P. Brissé, J.-P. Musset, P. Pierron, E. Fagundez, D. Lecointe, C. Théodora, D. Vollereau, C. Malbrunot, and C. Fèvre
Subjects: Gynecology, medicine.medical_specialty, biology, business.industry, Nosocomial transmission, Prevalence, General Medicine, bacterial infections and mycoses, biology.organism_classification, Legionella pneumophila, respiratory tract diseases, Surgery, medicine, Colony count, bacteria, Disease prevention, Interdisciplinary communication, Hot water supply, business
Abstract: To reduce the Legionella-linked risk in the several sites of Sud-Francilien Hospital, following a hospital-acquired legionellosis case, a multidisciplinary working group performed an action plan monitored through Legionella pneumophila counts in hot water supply. From 2003 to the first half year 2009, positive points for Legionella pneumophila in the main sites of the hospital decreased from 85.71 to 28.00%, representing a significant reduction of 67.33%. Similar results were observed for three of the four establishments, whereas the last did not describe a pronounced reduction of Legionella pneumophila counts and showed constantly serogroup 1 strains. During this period, investigations of additional cases of legionellosis demonstrated a nosocomial transmission in one case in this last site. Multidisciplinary mobilization in management of Legionella-linked risk contributed to these results.
Published: 2010

41. High purity pion beam at TRIUMF

Author: J. Doornbos, N. Ito, Luca Doria, A. Sher, C. Malbrunot, B. Walker, S. H. Kettell, Leonid Kurchaninov, A.H. Hussein, T. Numao, M. Blecher, Glenn M. Marshall, R. Poutissou, J. R. Comfort, Douglas Bryman, K. Yamada, and Alexis A. Aguilar-Arevalo
Subjects: Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Particle physics, Physics - Instrumentation and Detectors, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Momentum, High Energy Physics - Experiment (hep-ex), Pion, Pion beam, Positron, Particle separation, 0103 physical sciences, Calibration, Nuclear Experiment, 010306 general physics, Instrumentation, Physics, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), Physics::Accelerator Physics, Physics - Accelerator Physics, High Energy Physics::Experiment, Beam (structure)
Abstract: An extension of the TRIUMF M13 low-energy pion channel designed to suppress positrons based on an energy-loss technique is described. A source of beam channel momentum calibration from the decay pi+ --> e+ nu is also described., 5 pages
Published: 2009

42. Passage de l’enfant à l’adulte : l’exemple d’un centre de ressources et de compétences pour la mucoviscidose

Author: C. Person, C. Bonnemains, M. Chiffoleau, T. Urban, E. Darviot, A.-C. Malbrunot-Wagner, F. Troussier, and J.-L. Giniès
Subjects: Gynecology, medicine.medical_specialty, Health services, business.industry, Pediatrics, Perinatology and Child Health, medicine, business
Abstract: Resume Objectif de l’etude Le but de cette etude etait d’analyser les modalites du transfert des patients suivis au centre de ressources et de competences pour la mucoviscidose du centre hospitalier universitaire d’Angers de la pediatrie vers les soins adultes. Population et methode Nous avons etudie les modalites du passage de 22 patients de la pediatrie vers le service de pneumologie adulte et, a l’aide de questionnaires, leur ressenti et celui des soignants. Resultats Il etait prevu de transferer les patients vers 18 ans en organisant 3 consultations conjointes avec le pediatre et le pneumologue. L’âge moyen de transfert etait de 22 ans. Le transfert durait en moyenne 9 mois pendant lesquels la moitie des patients n’ont eu que 1 consultation conjointe. L’âge de 18 ans et la maturite etaient les criteres de transfert les plus souvent cites. La majorite des patients consideraient le nombre de consultations conjointes insuffisant et la transition trop courte. Patients et soignants soulignaient la difficulte de quitter un environnement pediatrique auquel ils etaient fortement attaches. Discussion La transition des soins est encore ressentie differemment entre les patients et les soignants. Elle est souvent trop courte. Le patient doit etre autonomise et progressivement prepare a ce passage. Conclusion Ce travail montre l’importance dans la vie du patient de ce changement d’equipe de soins. Il doit etre prepare avec lui et necessite une cooperation entre les equipes pediatriques et adultes. A partir de cette experience, un programme de transition de soins pour les patients atteints de mucoviscidose est propose.
Published: 2009

43. Improved Measurement of theπ→eνBranching Ratio

Author: D. Vavilov, T. Numao, M. Ding, Masaharu Aoki, Dave Britton, C. Malbrunot, Ahmed Hussein, Koji Yamada, L. S. Littenberg, T. Sullivan, S. Cuen-Rochin, S. Ito, Douglas Bryman, R. E. Mischke, Y. Igarashi, P. Gumplinger, A. Sher, D. Vom Bruch, Luca Doria, Leonid Kurchaninov, J. R. Comfort, Song Chen, S. H. Kettell, M. Blecher, D. Protopopescu, and Alexis A. Aguilar-Arevalo
Subjects: Physics, Crystallography, Branching fraction, General Physics and Astronomy, Statistical physics
Abstract: A new measurement of the branching ratio R_{e/μ}=Γ(π^{+}→e^{+}ν+π^{+}→e^{+}νγ)/Γ(π^{+}→μ^{+}ν+π^{+}→μ^{+}νγ) resulted in R_{e/μ}^{exp}=[1.2344±0.0023(stat)±0.0019(syst)]×10^{-4}. This is in agreement with the standard model prediction and improves the test of electron-muon universality to the level of 0.1%.
Published: 2015

44. Improved Measurement of the π→eν Branching Ratio

Author: A, Aguilar-Arevalo, M, Aoki, M, Blecher, D I, Britton, D A, Bryman, D, Vom Bruch, S, Chen, J, Comfort, M, Ding, L, Doria, S, Cuen-Rochin, P, Gumplinger, A, Hussein, Y, Igarashi, S, Ito, S H, Kettell, L, Kurchaninov, L S, Littenberg, C, Malbrunot, R E, Mischke, T, Numao, D, Protopopescu, A, Sher, T, Sullivan, D, Vavilov, and K, Yamada
Abstract: A new measurement of the branching ratio R_{e/μ}=Γ(π^{+}→e^{+}ν+π^{+}→e^{+}νγ)/Γ(π^{+}→μ^{+}ν+π^{+}→μ^{+}νγ) resulted in R_{e/μ}^{exp}=[1.2344±0.0023(stat)±0.0019(syst)]×10^{-4}. This is in agreement with the standard model prediction and improves the test of electron-muon universality to the level of 0.1%.
Published: 2015

45. An atomic hydrogen beam to test ASACUSA’s apparatus for antihydrogen spectroscopy

Author: M. Diermaier, P. Caradonna, B. Kolbinger, C. Malbrunot, O. Massiczek, C. Sauerzopf, M. C. Simon, M. Wolf, J. Zmeskal, and E. Widmann
Published: 2015

46. Numerical Simulations of Hyperfine Transitions of Antihydrogen

Author: Eberhard Widmann, M. C. Simon, Sebastian Lehner, A. A. Capon, M. Diermaier, C. Malbrunot, B. Kolbinger, C. Sauerzopf, and O. Massiczek
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Physics::General Physics, Atomic Physics (physics.atom-ph), CPT symmetry, Other Fields of Physics, FOS: Physical sciences, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Physics - Atomic Physics, Nuclear physics, Antiproton, Antimatter, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, Physical and Theoretical Chemistry, Ground state, Nucleon, Antihydrogen, Hyperfine structure
Abstract: One of the ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration's goals is the measurement of the ground state hyperfine transition frequency in antihydrogen, the antimatter counterpart of one of the best known systems in physics. This high precision experiment yields a sensitive test of the fundamental symmetry of CPT. Numerical simulations of hyperfine transitions of antihydrogen atoms have been performed providing information on the required antihydrogen events and the achievable precision. One of the ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration’s goals is the measurement of the ground state hyperfine transition frequency in antihydrogen, the antimatter counterpart of one of the best known systems in physics. This high precision experiment yields a sensitive test of the fundamental symmetry of CPT. Numerical simulations of hyperfine transitions of antihydrogen atoms have been performed providing information on the required antihydrogen events and the achievable precision. One of the ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration's goals is the measurement of the ground state hyperfine transition frequency in antihydrogen, the antimatter counterpart of one of the best known systems in physics. This high precision experiment yields a sensitive test of the fundamental symmetry of CPT. Numerical simulations of hyperfine transitions of antihydrogen atoms have been performed providing information on the required antihydrogen events and the achievable precision.
Published: 2015

47. Épidémiologie et résistance aux antibiotiques de Streptococcus pneumoniae en Île de France en 2001

Author: N Lucet, F. Faibis, C Dupeyron, C Gallet, D Mathieu, C Chaplain, Elisabeth Chachaty, A. Fremaux, G Otterbein, C. Benoit, J C Decotte, J Pollet, F Le Manach, A Mangeol, A. Artigou, B. Hacquard, D. Demontrond, E Cambau, M.C. Demachy, F Cousinard, B Ferre, C Malbrunot, A Dublanchet, T. Rabenja, M Hornstein, A Farges, P Legrand, C Spicq, I Poilane, P Cormier, A Cecille, P. Guiet, F. Pateyron, and M.J. Galanti
Subjects: Gynecology, medicine.medical_specialty, Infectious Diseases, Ile de france, business.industry, β lactams, medicine, Benzylpénicilline, business, Antibacterial agent
Abstract: Resume Objectif. – Evaluer le niveau de resistance aux antibiotiques du pneumocoque en Ile de France. Methode. – En 2001, 637 souches cliniques de pneumocoque ont ete etudiees a partir de 32 laboratoires de microbiologie. Resultats. – Cinquante et un pour cent des souches ont ete isolees chez les enfants de moins de 15 ans et 49 % chez les adultes. Chez l'enfant 76 % des souches provenaient de pus d'oreille, 20 % d'hemocultures ; chez l'adulte la plupart des souches (92 %) provenaient d'hemocultures. Le pourcentage de pneumocoque de sensibilite diminuee a la penicilline G est globalement de 61 %, plus eleve chez l'enfant (73 %) que chez l'adulte (50 %). Parmi les souches de moindre sensibilite, 21,8 % sont resistantes a la penicilline (CMI > 1 mg/l). La sensibilite diminuee a l'amoxicilline et au cefotaxime concerne respectivement 38 et 17 % des souches. Les souches resistantes a ces deux molecules (CMI > 2 mg/l) sont rares 2,6 et 0,4 % respectivement. Parmi les autres antibiotiques, les taux de resistance sont de 63 % pour l'erythromycine, 47 % pour le cotrimoxazole, 40 % pour les tetracyclines et 23 % pour le chloramphenicol. Les serogroupes les plus frequents sont les serogroupes 19 et 14, respectivement 23 et 18 %. Les serotypes contenus dans le vaccin heptavalent couvrent 90 % des souches isolees chez l'enfant de moins de deux ans. Conclusion. – Les taux de resistance a la penicilline sont plus particulierement eleves dans les pus d'oreille chez l'enfant (76 %).
Published: 2004

48. Status of the PIENU experiment

Author: S. Cuen-Rochin, Douglas Bryman, D. Vavilov, Leonid Kurchaninov, Masaharu Aoki, Song Chen, A.H. Hussein, R. E. Mischke, L. S. Littenberg, Y. Igarashi, D. Vom Bruch, P. Gumplinger, T. Sullivan, Luca Doria, J. R. Comfort, S. H. Kettell, T. Numao, M. Blecher, Dave Britton, Alexis A. Aguilar-Arevalo, S. Ito, C. Malbrunot, A. Sher, and D. Protopopescu
Subjects: Physics, Nuclear physics, History, Muon, Branching fraction, Elementary particle, Fermion, Electron, Computer Science Applications, Education, Lepton, Dimensionless quantity
Abstract: The branching ratio, Re/μ = Γ(π → eν + eνγ)/Γ(π → μν + μνγ), provides a sensitive test of muon-electron universality in weak interactions. The status of the PIENU experiment at TRIUMF, which aims to improve the precision of the Re/μ measurement by a factor of > 5, is presented.
Published: 2014

49. Investigation of silicon sensors for their use as antiproton annihilation detectors

Author: O. Ahlén, Ruggero Caravita, L. Cabaret, T. Huse, C. Regenfus, A. Sosa, V. A. Matveev, Rafael Ferragut, Alban Kellerbauer, Heidi Sandaker, P. Bräunig, G. Nebbia, S. Haider, S. N. Gninenko, Massimo Caccia, Cristina Riccardi, Marco Prevedelli, Patrick Nedelec, G. Burghart, Adriano Fontana, Giovanni Consolati, Sebastiano Mariazzi, S. Di Domizio, Johann Zmeskal, M. A. Subieta Vasquez, A. Magnani, Germano Bonomi, J. H. Derking, M. Spacek, P. Genova, D. Krasnický, Markus K. Oberthaler, Stefano Aghion, R. S. Brusa, L. Di Noto, Alberto Rotondi, Marco Giammarchi, J. Harasimowicz, Vojtech Petracek, Giovanni Cerchiari, Carsten Welsch, Carlo Canali, Angela Gligorova, P. Yzombard, C. Malbrunot, Eberhard Widmann, Alexey Dudarev, V. Lagomarsino, Sebastian Lehner, F. Moia, N. Pacifico, Clara Nellist, J. Bremer, T. Kaltenbacher, L. V. Jørgensen, A. Knecht, Sandra Zavatarelli, C. Da Via, Ole Røhne, G. Testera, Fabrizio Castelli, Michael Doser, F. Prelz, Daniel Comparat, Simone Cialdi, E. Jordan, A. S. Belov, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and AEGIS
Subjects: Silicon, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Antiprotons, Gravitational acceleration, 01 natural sciences, Nuclear physics, Planar, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], AEgIS, Detector, Pixel, Strip, Instrumentation, Detectors and Experimental Techniques, 010306 general physics, Antihydrogen, ComputingMilieux_MISCELLANEOUS, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Antiproton Decelerator, Antiproton, Antimatter, Silicon, Antiprotons, Detector, AEgIS, Strip, Pixel
Abstract: We present here a new application of silicon sensors aimed at the direct detection of antinucleons annihilations taking place inside the sensor׳s volume. Such detectors are interesting particularly for the measurement of antimatter properties and will be used as part of the gravity measurement module in the AE g ¯ IS experiment at the CERN Antiproton Decelerator. One of the goals of the AE g ¯ IS experiment is to measure the gravitational acceleration of antihydrogen with 1% precision. Three different silicon sensor geometries have been tested with an antiproton beam to investigate their properties as annihilation detection devices: strip planar, 3D pixels and monolithic pixel planar. In all cases we were successfully detecting annihilations taking place in the sensor and we were able to make a first characterization of the clusters and tracks.
Published: 2014

50. Measuring the gravitational free-fall of antihydrogen

Author: Ole Røhne, C. Malbrunot, Giovanni Consolati, F. Prelz, Alban Kellerbauer, Germano Bonomi, Akitaka Ariga, J. H. Derking, Davide Trezzi, G. Testera, M. Spacek, Cristina Riccardi, F. Moia, Rafael Ferragut, Patrick Nedelec, Alberto Rotondi, Fabrizio Castelli, G. Nebbia, V. Petráček, Johann Zmeskal, P. Bräunig, Michael Doser, Daniel Comparat, S. Di Domizio, L. Cabaret, A. Knecht, Sandra Zavatarelli, Marco Prevedelli, T. Huse, S. Haider, Jiro Kawada, L. Di Noto, S. D. Hogan, R. S. Brusa, Marco Giammarchi, J. Bremer, Sebastiano Mariazzi, P. Genova, Eberhard Widmann, Paola Scampoli, James William Storey, M. A. Subieta Vasquez, O. Ahlén, V. Lagomarsino, Heidi Sandaker, Angela Gligorova, N. Pacifico, Sebastian Lehner, Viktor Matveev, Stefano Aghion, Frédéric Merkt, Alexey Dudarev, Adriano Fontana, Claude Amsler, M. Kimura, R. Vaccarone, C. Regenfus, L. V. Jørgensen, Antonio Ereditato, Carlo Canali, Tomoko Ariga, D. Krasnický, T. Kaltenbacher, Giovanni Cerchiari, Simone Cialdi, E. Jordan, A. S. Belov, S. N. Gninenko, C. Pistillo, Ruggero Caravita, Markus K. Oberthaler, Storey, J., Aghion, S., Ahlén, O., Amsler, C., Ariga, A., Ariga, T., Belov, A. S., Bonomi, G., Bräunig, P., Bremer, J., Brusa, R. S., Cabaret, L., Canali, C., Caravita, R., Castelli, F., Cerchiari, G., Cialdi, S., Comparat, D., Consolati, G., Derking, J. H., Di Domizio, S., Di Noto, L., Doser, M., Dudarev, A., Ereditato, A., Ferragut, R., Fontana, A., Genova, P., Giammarchi, M., Gligorova, A., Gninenko, S. N., Haider, S., Hogan, S. D., Huse, T., Jordan, E., Jørgensen, L. V., Kaltenbacher, T., Kawada, J., Kellerbauer, A., Kimura, M., Knecht, A., Krasnický, D., Lagomarsino, V., Lehner, S., Malbrunot, C., Mariazzi, S., Matveev, V. A., Merkt, F., Moia, F., Nebbia, G., Nédélec, P., Oberthaler, M. K., Pacifico, N., Petráček, V., Pistillo, C., Prelz, F., Prevedelli, M., Regenfus, C., Riccardi, C., Røhne, O., Rotondi, A., Sandaker, H., Scampoli, Paola, Subieta Vasquez, M. A., Špaček, M., Testera, G., Trezzi, D., Vaccarone, R., Widmann, E., Zavatarelli, S., and Zmeskal, J.
Subjects: AegIS, Antihydrogen, Emulsions, Gravity, Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics, Condensed Matter Physics, Physical and Theoretical Chemistry, Antiparticle, Particle physics, Atom interferometer, 530 Physics, Physics::Instrumentation and Detectors, Nuclear physics, Atomic and Molecular Physics, Physics::Atomic Physics, AegIS, Antihydrogen, Emulsions, Gravity, Physics, Detector, Antiproton Decelerator, Antiproton, Antimatter, High Energy Physics::Experiment, and Optics, Impact parameter
Abstract: Antihydrogen holds the promise to test, for the first time, the universality of free-fall with a system composed entirely of antiparticles. The AEgIS experiment at CERN’s antiproton decelerator aims to measure the gravitational interaction between matter and antimatter by measuring the deflection of a beam of antihydrogen in the Earths gravitational field (g¯¯¯). The principle of the experiment is as follows: cold antihydrogen atoms are synthesized in a Penning-Malberg trap and are Stark accelerated towards a moiré deflectometer, the classical counterpart of an atom interferometer, and annihilate on a position sensitive detector. Crucial to the success of the experiment is the spatial precision of the position sensitive detector. We propose a novel free-fall detector based on a hybrid of two technologies: emulsion detectors, which have an intrinsic spatial resolution of 50 nm but no temporal information, and a silicon strip / scintillating fiber tracker to provide timing and positional information. In 2012 we tested emulsion films in vacuum with antiprotons from CERN’s antiproton decelerator. The annihilation vertices could be observed directly on the emulsion surface using the microscope facility available at the University of Bern. The annihilation vertices were successfully reconstructed with a resolution of 1–2 μmon the impact parameter. If such a precision can be realized in the final detector, Monte Carlo simulations suggest of order 500 antihydrogen annihilations will be sufficient to determine g¯¯¯with a 1 % accuracy. This paper presents current research towards the development of this technology for use in the AEgIS apparatus and prospects for the realization of the final detector., Hyperfine Interactions, 228 (1-3), ISSN:0304-3843, ISSN:0304-3834, ISSN:1572-9540, Proceedings of the 11th International Conference on Low Energy Antiproton Physics (LEAP 2013) held in Uppsala, Sweden, 10–15 June, 2013
Published: 2014

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