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Articles by A. Capra
VIDÉO - Dans cette ferme pédagogique, les animaux participent à enseigner le vivre-ensemble
La ferme des Iriselles est installée à Jonchery-sur-Vesle dans la Marne. Dans ce parc de 8 hectares, ce sont Sophie Barher et Marie Delreux qui supervisent les opérations. Elles veillent au bien-être des 150 animaux qui vivent ici. Certains sont nés à la ferme, d'autres ont dû s'adapter. "La grande ânesse a quitté le troupeau dans lequel elle vivait. On a senti que le début était compliqué. À son arrivée, il a fallu la prendre vraiment tout en douceur.
Four ppm measurement of the antihydrogen ground-state hyperfine splitting
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Abstract The hydrogen atom is a touchstone for the foundations, evolution and frontiers of quantum theory1,2,3,4,5,6,7,8,9. Key spectral lines of this atom have been determined to remarkable precision10,11. Our research focuses on the study of antihydrogen, the antimatter counterpart of hydrogen. We test fundamental symmetries of nature (such as simultaneous charge conjugation, parity inversion, and time reversal or CPT symmetry) through precision comparisons of these atomic systems12.
By C. Baker, W. Bertsche, N. Bhatt, G. Bonomi, A. Capra, I. Carli, C. L. Cesar, M. B. Charlton, A. Cridland Mathad, D. Duque Quiceno, S. Eriksson, A. Mark Evans, J. Fajans, T. Max Friesen, M. Fujiwara, L. Golino, M. Gonçalves, J. S. Hangst, D. Hodgkinson, C. Isaac, S. A. Jones, S. Jonsell, N. M. Madsen, V. R. Marshall, T. Momose, J. Nauta, A. Oliveira, A. Powell, C. Rasmussen, T. Robertson-Brown, F. Robicheaux, J. Schoonwater, J. A. Singh, G. R. Smith, C. So, S. Stracka, J. Suh, K. Thompson, R. I. Thompson, E. Thorpe-Woods, A. Jiménez, M. Urioni, P. Woosaree, J. S. Wurtele, R. Akbari, L. O. de Araujo Azevedo, A. Del Vincio, M. E. Hayden, P. Heidari, J. T. K. McKenna, R. L. Sacramento, E. Sarid, D. M. Silveira, A. G. Swadling, T. D. Tharp, D. P. van de Werf, S. G. Wilson
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Nature
Verified
Be+ assisted, simultaneous confinement of more than 15000 antihydrogen atoms - Nature Communications
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Abstract Antihydrogen, the bound state of a positron and an antiproton, is the only pure anti-atomic system ever studied. It is produced exclusively in the laboratory, as it has never been observed in nature. This unique system is of great interest for searching for tentative differences between matter and antimatter.
By C. Baker, N. Bhatt, G. Bonomi, A. Capra, I. Carli, C. L. Cesar, M. B. Charlton, A. Cridland Mathad, D. Duque Quiceno, J. Fajans, L. Golino, J. S. Hangst, D. Hodgkinson, S. A. Jones, S. Jonsell, N. M. Madsen, J. Nauta, A. Oliveira, J. Peszka, A. Powell, C. Rasmussen, F. Robicheaux, J. Schoonwater, J. D. Singh, G. R. Smith, S. Stracka, J. Suh, E. Thorpe-Woods, M. Urioni, T. Momose, T. Robertson-Brown, R. I. Thompson, P. Woosaree
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Nature
Verified
Precision spectroscopy of the hyperfine components of the 1S–2S transition in antihydrogen - Nature Physics
Abstract The antimatter equivalent of atomic hydrogen—antihydrogen—is an outstanding testbed for precision studies of matter–antimatter symmetry. Here we report on the simultaneous observation of both accessible hyperfine components of the 1S–2S transition in trapped antihydrogen.
Observation of the effect of gravity on the motion of antimatter - Nature
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Abstract Einstein’s general theory of relativity from 19151 remains the most successful description of gravitation. From the 1919 solar eclipse2 to the observation of gravitational waves3, the theory has passed many crucial experimental tests. However, the evolving concepts of dark matter and dark energy illustrate that there is much to be learned about the gravitating content of the universe.
By N. Bhatt, A. Capra, J. Fajans, L. Golino, S. A. Jones, S. Jonsell, N. M. Madsen, L. Martín, A. Oliveira, A. Powell, C. Rasmussen, F. Robicheaux, J. A. Singh, G. R. Smith, I. Carli, C. L. Cesar, A. Cridland Mathad, D. Duque Quiceno, P. Grandemange, P. Granum, J. S. Hangst, D. Hodgkinson, A. Khramov, J. Peszka, M. Sameed, J. Schoonwater, S. Stracka, G. Stutter, E. Thorpe-Woods, M. Urioni
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Nature
Verified
Laser cooling of antihydrogen atoms
Abstract The photon—the quantum excitation of the electromagnetic field—is massless but carries momentum. A photon can therefore exert a force on an object upon collision1. Slowing the translational motion of atoms and ions by application of such a force2,3, known as laser cooling, was first demonstrated 40 years ago4,5.
Investigation of the fine structure of antihydrogen
Abstract At the historic Shelter Island Conference on the Foundations of Quantum Mechanics in 1947, Willis Lamb reported an unexpected feature in the fine structure of atomic hydrogen: a separation of the 2S1/2 and 2P1/2 states1. The observation of this separation, now known as the Lamb shift, marked an important event in the evolution of modern physics, inspiring others to develop the theory of quantum electrodynamics2,3,4,5.
Observation of the 1S-2P Lyman-α transition in antihydrogen
Challenges to antimatter Lyman-α spectroscopy include the difficulty of fabricating optical components and continuous-wave11 or pulsed laser sources at these extremely short wavelengths, as well as the scarcity of anti-atoms.
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