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Hunter E, Amsler C, Breuker H, Chesnevskaya S, Costantini G, Ferragut R, Giammarchi M, Gligorova A, Gosta G, Higaki H, Kanai Y, Killian C, Kletzl V, Kraxberger V, Kuroda N, Lanz A, Leali M, Mäckel V, Maero G, Malbrunot C, Mascagna V, Matsuda Y, Migliorati S, Murtagh D, Nagata Y, Nanda A, Nowak L, Pasino E, Romé M, Simon M, Tajima M, Toso V, Ulmer S, Uggerhøj U, Venturelli L, Weiser A, Widmann E, Wolz T, Yamazaki Y, Zmeskal J. Minimizing plasma temperature for antimatter mixing experiments. EPJ Web Conf 2022. [DOI: 10.1051/epjconf/202226201007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The ASACUSA collaboration produces a beam of antihydrogen atoms by mixing pure positron and antiproton plasmas in a strong magnetic field with a double cusp geometry. The positrons cool via cyclotron radiation inside the cryogenic trap. Low positron temperature is essential for increasing the fraction of antihydrogen atoms which reach the ground state prior to exiting the trap. Many experimental groups observe that such plasmas reach equilibrium at a temperature well above the temperature of the surrounding electrodes. This problem is typically attributed to electronic noise and plasma expansion, which heat the plasma. The present work reports anomalous heating far beyond what can be attributed to those two sources. The heating seems to be a result of the axially open trap geometry, which couples the plasma to the external (300 K) environment via microwave radiation.
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Folegati P, Ferragut R, Toso V, Anzi L, Cacciatori M, Duchini M, Frigerio M, Ostinelli A, Cherubini R, De Nadal V. Positron annihilation spectroscopy for fundamental studies of living cells. Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00550-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Sala S, Ariga A, Ereditato A, Ferragut R, Giammarchi M, Leone M, Pistillo C, Scampoli P. First demonstration of antimatter wave interferometry. Sci Adv 2019; 5:eaav7610. [PMID: 31058223 PMCID: PMC6499593 DOI: 10.1126/sciadv.aav7610] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 03/25/2019] [Indexed: 06/09/2023]
Abstract
Interference of matter waves is at the heart of quantum physics and has been observed for a wide range of particles from electrons to complex molecules. Here, we demonstrate matter wave interference of single positrons using a period-magnifying Talbot-Lau interferometer based on material diffraction gratings. The system produced high-contrast periodic fringes, which were detected by means of nuclear emulsions capable of determining the impact point of each individual positron with submicrometric resolution. The measured energy dependence of fringe contrast in the range of 8 to 16 keV proves the quantum-mechanical origin of the periodic pattern and excludes classical projective effects, providing the first observation to date of antimatter wave interference. Future applications of this interferometric technique include the measurement of the gravitational acceleration of neutral antimatter systems exploiting the inertial sensing capabilities of Talbot-Lau interference.
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Affiliation(s)
- S. Sala
- Dipartimento di Fisica “Aldo Pontremoli,” Università degli Studi di Milano, via Celoria 16, 20133 Milano, Italy
- Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Milano, via Celoria 16, 20133 Milano, Italy
| | - A. Ariga
- Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
| | - A. Ereditato
- Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
| | - R. Ferragut
- Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Milano, via Celoria 16, 20133 Milano, Italy
- L-NESS and Department of Physics, Politecnico di Milano, via Anzani 42, 22100 Como, Italy
| | - M. Giammarchi
- Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Milano, via Celoria 16, 20133 Milano, Italy
| | - M. Leone
- L-NESS and Department of Physics, Politecnico di Milano, via Anzani 42, 22100 Como, Italy
| | - C. Pistillo
- Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
| | - P. Scampoli
- Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
- Dipartimento di Fisica “Ettore Pancini,” Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, 80126 Napoli, Italy
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4
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Doser M, Aghion S, Amsler C, Bonomi G, Brusa RS, 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 SR, Nebbia G, Nedelec P, Oberthaler M, Pacifico N, Pagano D, Penasa L, Petracek V, Prelz F, Prevedelli M, Rienaecker B, Robert J, Røhne OM, Rotondi A, Sandaker H, Santoro R, Smestad L, Sorrentino F, Testera G, Tietje IC, Widmann E, Yzombard P, Zimmer C, Zmeskal J, Zurlo N. AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam. Philos Trans A Math Phys Eng Sci 2018; 376:20170274. [PMID: 29459413 PMCID: PMC5829176 DOI: 10.1098/rsta.2017.0274] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/05/2017] [Indexed: 06/08/2023]
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 [Formula: see text], radial compression to sub-millimetre radii of mixed [Formula: see text] plasmas in 1 T field, high-efficiency transfer of [Formula: see text] 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'.
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Affiliation(s)
- M Doser
- Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - S Aghion
- Politecnico of Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
- INFN Milano, via Celoria 16, 20133 Milano, Italy
| | - C Amsler
- Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
| | - G Bonomi
- Department of Mechanical and Industrial Engineering, University of Brescia, via Branze 38, 25123 Brescia, Italy
- INFN Pavia, via Bassi 6, 27100 Pavia, Italy
| | - R S Brusa
- Department of Physics, University of Trento, via Sommarive 14, 38123 Povo, Trento, Italy
- TIFPA/INFN Trento, via Sommarive 14, 38123 Povo, Trento, Italy
| | - M Caccia
- INFN Milano, via Celoria 16, 20133 Milano, Italy
- Department of Science, University of Insubria, via Valleggio 11, 22100 Como, Italy
| | - R Caravita
- Department of Physics, University of Genova, via Dodecaneso 33, 16146 Genova, Italy
- INFN Genova, via Dodecaneso 33, 16146 Genova, Italy
| | - F Castelli
- INFN Milano, via Celoria 16, 20133 Milano, Italy
- Department of Physics, University of Milano, via Celoria 16, 20133 Milano, Italy
| | - G Cerchiari
- Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - D Comparat
- Laboratoire Aimé Cotton, Université Paris-Sud, ENS Cachan, CNRS, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - G Consolati
- Politecnico of Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
- INFN Milano, via Celoria 16, 20133 Milano, Italy
| | - A Demetrio
- Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
| | - L Di Noto
- Department of Physics, University of Genova, via Dodecaneso 33, 16146 Genova, Italy
- INFN Genova, via Dodecaneso 33, 16146 Genova, Italy
| | - C Evans
- Politecnico of Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
- INFN Milano, via Celoria 16, 20133 Milano, Italy
| | - M Fanì
- Physics Department, CERN, 1211 Geneva 23, Switzerland
- Department of Physics, University of Genova, via Dodecaneso 33, 16146 Genova, Italy
- INFN Genova, via Dodecaneso 33, 16146 Genova, Italy
| | - R Ferragut
- Politecnico of Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
- INFN Milano, via Celoria 16, 20133 Milano, Italy
| | - J Fesel
- Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - A Fontana
- INFN Pavia, via Bassi 6, 27100 Pavia, Italy
| | - S Gerber
- Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - M Giammarchi
- INFN Milano, via Celoria 16, 20133 Milano, Italy
| | - A Gligorova
- Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
| | - F Guatieri
- Department of Physics, University of Trento, via Sommarive 14, 38123 Povo, Trento, Italy
- TIFPA/INFN Trento, via Sommarive 14, 38123 Povo, Trento, Italy
| | - S Haider
- Physics Department, CERN, 1211 Geneva 23, Switzerland
| | | | - H Holmestad
- Department of Physics, University of Oslo, Sem Slandsvei 24, 0371 Oslo, Norway
| | - A Kellerbauer
- Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - O Khalidova
- Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - D Krasnický
- INFN Genova, via Dodecaneso 33, 16146 Genova, Italy
| | - V Lagomarsino
- Department of Physics, University of Genova, via Dodecaneso 33, 16146 Genova, Italy
- INFN Genova, via Dodecaneso 33, 16146 Genova, Italy
| | - P Lansonneur
- Institute of Nuclear Physics, CNRS/IN2p3, University of Lyon 1, 69622 Villeurbanne, France
| | - P Lebrun
- Institute of Nuclear Physics, CNRS/IN2p3, University of Lyon 1, 69622 Villeurbanne, France
| | - C Malbrunot
- Physics Department, CERN, 1211 Geneva 23, Switzerland
- Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
| | - S Mariazzi
- INFN Padova, via Marzolo 8, 35131 Padova, Italy
| | - J Marton
- Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
| | - V Matveev
- Institute for Nuclear Research of the Russian Academy of Science, Moscow 117312, Russia
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - Z Mazzotta
- INFN Milano, via Celoria 16, 20133 Milano, Italy
- Department of Physics, University of Milano, via Celoria 16, 20133 Milano, Italy
| | - S R Müller
- Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
| | - G Nebbia
- INFN Padova, via Marzolo 8, 35131 Padova, Italy
| | - P Nedelec
- Institute of Nuclear Physics, CNRS/IN2p3, University of Lyon 1, 69622 Villeurbanne, France
| | - M Oberthaler
- Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany
| | - N Pacifico
- Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - D Pagano
- Department of Mechanical and Industrial Engineering, University of Brescia, via Branze 38, 25123 Brescia, Italy
- INFN Pavia, via Bassi 6, 27100 Pavia, Italy
| | - L Penasa
- Department of Physics, University of Trento, via Sommarive 14, 38123 Povo, Trento, Italy
- TIFPA/INFN Trento, via Sommarive 14, 38123 Povo, Trento, Italy
| | - V Petracek
- Czech Technical University in Prague, Brehová 7, 11519 Prague 1, Czech Republic
| | - F Prelz
- INFN Milano, via Celoria 16, 20133 Milano, Italy
| | - M Prevedelli
- University of Bologna, Viale Berti Pichat 6/2, 40126 Bologna, Italy
| | - B Rienaecker
- Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - J Robert
- Laboratoire Aimé Cotton, Université Paris-Sud, ENS Cachan, CNRS, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - O M Røhne
- Department of Physics, University of Oslo, Sem Slandsvei 24, 0371 Oslo, Norway
| | - A Rotondi
- INFN Pavia, via Bassi 6, 27100 Pavia, Italy
- Department of Physics, University of Pavia, via Bassi 6, 27100 Pavia, Italy
| | - H Sandaker
- Department of Physics, University of Oslo, Sem Slandsvei 24, 0371 Oslo, Norway
| | - R Santoro
- INFN Milano, via Celoria 16, 20133 Milano, Italy
- Department of Science, University of Insubria, via Valleggio 11, 22100 Como, Italy
| | - L Smestad
- Physics Department, CERN, 1211 Geneva 23, Switzerland
- The Research Council of Norway, PO Box 564, 1327 Lysaker, Norway
| | - F Sorrentino
- INFN Genova, via Dodecaneso 33, 16146 Genova, Italy
| | - G Testera
- INFN Genova, via Dodecaneso 33, 16146 Genova, Italy
| | - I C Tietje
- Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - E Widmann
- Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
| | - P Yzombard
- Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - C Zimmer
- Physics Department, CERN, 1211 Geneva 23, Switzerland
- Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany
- Department of Physics, Heidelberg University, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany
| | - J Zmeskal
- Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
| | - N Zurlo
- INFN Pavia, via Bassi 6, 27100 Pavia, Italy
- Department of Civil Engineering, University of Brescia, via Branze 43, 25123 Brescia, Italy
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Guatieri F, Aghion S, Amsler C, Angela G, Bonomi G, Brusa R, Caccia M, Caravita R, Castelli F, Cerchiari G, Comparat D, Consolati G, Demetrio A, Di Noto L, Doser M, Evans C, Fanì M, Ferragut R, Fesel J, Fontana A, Gerber S, Giammarchi M, Gligorova A, Haider S, Hinterberger A, Holmestad H, Kellerbauer A, Krasnický D, Lagomarsino V, Lansonneur P, Lebrun P, Malbrunot C, Mariazzi S, Matveev V, Mazzotta Z, Müller S, Nebbia G, Nedelec P, Oberthaler M, Pacifico N, Pagano D, Penasa L, Petracek V, Prelz F, Prevedelli M, Rienaecker B, Robert J, Rhne. O, Rotondi A, Sacerdoti M, Sandaker H, Santoro R, Simon M, Smestad L, Sorrentino F, Testera G, Tietje I, Widmann E, Yzombard P, Zimmer C, Zmeskal J, Zurlo N. AEg̅IS latest results. EPJ Web of Conferences 2018. [DOI: 10.1051/epjconf/201718101037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The validity of the Weak Equivalence Principle (WEP) as predicted by General Relativity has been tested up to astounding precision using ordinary matter. The lack hitherto of a stable source of a probe being at the same time electrically neutral, cold and stable enough to be measured has prevented highaccuracy testing of the WEP on anti-matter. The AEg̅IS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) experiment located at CERN's AD (Antiproton Decelerator) facility aims at producing such a probe in the form of a pulsed beam of cold anti-hydrogen, and at measuring by means of a moiré deflectometer the gravitational force that Earth's mass exerts on it. Low temperature and abundance of the H̅ are paramount to attain a high precision measurement. A technique employing a charge-exchange reaction between antiprotons coming from the AD and excited positronium atoms is being developed at AEg̅IS and will be presented hereafter, alongside an overview of the experimental apparatus and the current status of the experiment
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Evans C, Aghion S, Amsler C, Bonomi G, Brusa R, Caccia M, Caravita R, Castelli F, Cerchiari G, Comparat D, Consolati G, Demetrio A, Di Noto L, Doser M, Fani 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, 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, Rotondi A, Sandaker H, Santoro R, Smestad L, Sorrentino F, Testera G, Tietje I, Widmann E, Yzombard P, Zimmer C, Zmeskal J, Zurlo N. Towards the first measurement of matter-antimatter gravitational interaction. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201818202040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
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 103 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.
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Kellerbauer A, Aghion S, Amsler C, Ariga A, Ariga T, Bonomi G, Bräunig P, Bremer J, Brusa RS, Cabaret L, Caccia M, Caravita R, Castelli F, Cerchiari G, Chlouba K, Cialdi S, Comparat D, Consolati G, Demetrio A, Di Noto L, Doser M, Dudarev A, Ereditato A, Evans C, Ferragut R, Fesel J, Fontana A, Gerber S, Giammarchi M, Gligorova A, Guatieri F, Haider S, Holmestad H, Huse T, Jordan E, Kimura M, Koettig T, Krasnický D, Lagomarsino V, Lansonneur P, Lebrun P, Lehner S, Liberadzka J, Malbrunot C, Mariazzi S, Matveev V, Mazzotta Z, Nebbia G, Nédélec P, Oberthaler M, Pacifico N, Pagano D, Penasa L, Petráček V, Pistillo C, Prelz F, Prevedelli M, Ravelli L, Rienäcker B, Røhne O, Rotondi A, Sacerdoti M, Sandaker H, Santoro R, Scampoli P, Smestad L, Sorrentino F, Špaček M, Storey J, Strojek I, Testera G, Tietje I, Widmann E, Yzombard P, Zavatarelli S, Zmeskal J, Zurlo N. Probing antimatter gravity – The AEGIS experiment at CERN. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201612602016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Consolati G, Aghion S, Amsler C, Ariga A, Ariga T, Belov A, Bonomi G, Bräunig P, Bremer J, Brusa R, Cabaret L, Caccia M, Caravita R, Castelli F, Cerchiari G, Chlouba K, Cialdi S, Comparat D, Demetrio A, Derking H, Di Noto L, Doser M, Dudarev A, Ereditato A, Ferragut R, Fontana A, Gerber S, Giammarchi M, Gligorova A, Gninenko S, Haider S, Hogan S, Holmestad H, Huse T, Jordan EJ, Kawada J, Kellerbauer A, Kimura M, Krasnicky D, Lagomarsino V, Lehner S, Malbrunot C, Mariazzi S, Matveev V, Mazzotta Z, Nebbia G, Nedelec P, Oberthaler M, Pacifico N, Penasa L, Petracek V, Pistillo C, Prelz F, Prevedelli M, Ravelli L, Riccardi C, Røhne O, Rosenberger S, Rotondi A, Sacerdoti M, Sandaker H, Santoro R, Scampoli P, Simon M, Spacek M, Storey J, Strojek IM, Subieta M, Testera G, Widmann E, Yzombard P, Zavatarelli S, Zmeskal J. Experiments with low-energy antimatter. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20159601007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Subieta Vasquez MA, Aghion S, Ahlén O, Amsler C, Ariga A, Ariga T, Belov AS, Bonomi G, Bräunig P, Bremer J, Brusa RS, Cabaret L, Caccia M, Canali C, Caravita R, Castelli F, Cerchiari G, Cialdi S, Comparat D, Consolati G, Dassa L, Derking JH, Di Domizio S, Di Noto L, Doser M, Dudarev A, Ereditato A, Ferragut R, Fontana A, Genova P, Giammarchi M, Gligorova A, Gninenko SN, Heider S, Hogan SD, Huse T, Jordan E, Jørgensen LV, Kaltenbacher T, Kawada J, Kellerbauer A, Kimura M, Knecht A, Krasnický D, Lagomarsino V, Mariazzi S, Matveev VA, Merkt F, Moia F, Nebbia G, Nédélec P, Oberthaler MK, Pacifico N, Petráček V, Pistilo C, Prelz F, Prevedelli M, Regenfus C, Ricardi C, Røhne O, Rotondi A, Sandaker H, Scampoli P, Storey J, Špaček M, Testera G, Trezzi D, Vaccarone R, Villa F, Zavatarelli S. AE$\overline {\rm{g}}$IS Experiment: Measuring the acceleration gof the earth’s gravitational field on antihydrogen beam. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20147100128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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Ferragut R, Calloni A, Dupasquier A, Isella G. Defect Characterization in SiGe/SOI Epitaxial Semiconductors by Positron Annihilation. Nanoscale Res Lett 2010; 5:1942-1947. [PMID: 21170391 PMCID: PMC2991171 DOI: 10.1007/s11671-010-9818-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Accepted: 09/22/2010] [Indexed: 05/30/2023]
Abstract
The potential of positron annihilation spectroscopy (PAS) for defect characterization at the atomic scale in semiconductors has been demonstrated in thin multilayer structures of SiGe (50 nm) grown on UTB (ultra-thin body) SOI (silicon-on-insulator). A slow positron beam was used to probe the defect profile. The SiO(2)/Si interface in the UTB-SOI was well characterized, and a good estimation of its depth has been obtained. The chemical analysis indicates that the interface does not contain defects, but only strongly localized charged centers. In order to promote the relaxation, the samples have been submitted to a post-growth annealing treatment in vacuum. After this treatment, it was possible to observe the modifications of the defect structure of the relaxed film. Chemical analysis of the SiGe layers suggests a prevalent trapping site surrounded by germanium atoms, presumably Si vacancies associated with misfit dislocations and threading dislocations in the SiGe films.
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Affiliation(s)
- R Ferragut
- L-NESS, Dipartimento di Fisica, Politecnico di Milano, via Anzani 42, 22100, Como, Italy
| | - A Calloni
- L-NESS, Dipartimento di Fisica, Politecnico di Milano, via Anzani 42, 22100, Como, Italy
| | - A Dupasquier
- L-NESS, Dipartimento di Fisica, Politecnico di Milano, via Anzani 42, 22100, Como, Italy
| | - G Isella
- L-NESS, Dipartimento di Fisica, Politecnico di Milano, via Anzani 42, 22100, Como, Italy
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Folegati P, Dupasquier A, Ferragut R, Iglesias MM, Makkonen I, Puska MJ. Quantitative chemical analysis of vacancy-solute complexes in metallic solid solutions by coincidence Doppler broadening spectroscopy. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pssc.200675741] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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