Search Results - "van der Werf, D. P."

Radially selective inward transport of positrons in a Penning-Malmberg trap by Deller, A, Mortensen, T, Isaac, C A, P van der Werf, D, Charlton, M

“…The anharmonic component of the electric field of a Penning-Malmberg trap is exploited to manipulate a subset of the radial (r) distribution of trapped…”
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Resonant quantum transitions in trapped antihydrogen atoms by Amole, C., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Capra, A., Cesar, C. L., Charlton, M., Deller, A., Donnan, P. H., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayden, M. E., Humphries, A. J., Isaac, C. A., Jonsell, S., Kurchaninov, L., Little, A., Madsen, N., McKenna, J. T. K., Menary, S., Napoli, S. C., Nolan, P., Olchanski, K., Olin, A., Pusa, P., Rasmussen, C. Ø., Robicheaux, F., Sarid, E., Shields, C. R., Silveira, D. M., Stracka, S., So, C., Thompson, R. I., van der Werf, D. P., Wurtele, J. S.

“…These authors demonstrate resonant quantum transitions in a pure antimatter atom—antihydrogen—by using microwave radiation to flip the spin of the positron of…”
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Trapped antihydrogen by Hangst, J. S, Andresen, G. B, Ashkezari, M. D, Baquero-Ruiz, M, Bertsche, W, Bowe, P. D, Butler, E, Cesar, C. L, Chapman, S, Charlton, M, Deller, A, Eriksson, S, Fajans, J, Friesen, T, Fujiwara, M. C, Gill, D. R, Gutierrez, A, Hardy, W. N, Hayden, M. E, Humphries, A. J, Hydomako, R, Jenkins, M. J, Jonsell, S, Jørgensen, L. V, Kurchaninov, L, Madsen, N, Menary, S, Nolan, P, Olchanski, K, Olin, A, Povilus, A, Pusa, P, Robicheaux, F, Sarid, E, Nasr, S. Seif el, Silveira, D. M, So, C, Storey, J. W, Thompson, R. I, van der Werf, D. P, Wurtele, J. S, Yamazaki, Y

“…Antimatter was first predicted in 1931, by Dirac. Work with high-energy antiparticles is now commonplace, and anti-electrons are used regularly in the medical…”
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New source of dense, cryogenic positron plasmas by JØRGENSEN, L. V, AMORETTI, M, FUJIWARA, M. C, FUNAKOSHI, R, GENOVA, P, HANGST, J. S, HAYANO, R. S, KELLERBAUER, A, LAGOMARSINO, V, LANDUA, R, LODI RIZZINI, E, MACRI, M, BONOMI, G, MADSEN, N, MITCHARD, D, MONTAGNA, P, ROTONDI, A, TESTERA, G, VARIOLA, A, VENTURELLI, L, VAN DER WERF, D. P, YAMAZAKI, Y, BOWE, P. D, CANALI, C, CARRARO, C, CESAR, C. L, CHARLTON, M, DOSER, M, FONTANA, A

“…We have developed a new method, based on the ballistic transfer of preaccumulated plasmas, to obtain large and dense positron plasmas in a cryogenic…”
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Effects of extreme magnetic quadrupole fields on Penning traps and the consequences for antihydrogen trapping by FAJANS, J, BERTSCHE, W, BURKE, K, CHAPMAN, S. F, VAN DER WERF, D. P

“…Measurements on electrons confined in a Penning trap show that extreme quadrupole fields destroy particle confinement. Much of the particle loss comes from the…”
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Confinement of antihydrogen for 1,000 seconds by Andresen, G B, Ashkezari, M D, Baquero-ruiz, M, Bertsche, W, Bowe, P D, Butler, E, Cesar, C L, Charlton, M, Deller, A, Eriksson, S, Fajans, J, Friesen, T, Fujiwara, M C, Gill, D R, Gutierrez, A, Hangst, J S, Hardy, W N, Hayano, R S, Hayden, M E, Humphries, A J, Hydomako, R, Jonsell, S, Kemp, S L, Kurchaninov, L, Madsen, N, Menary, S, Nolan, P, Olchanski, K, Olin, A, Pusa, P, Rasmussen, C Ø, Robicheaux, F, Sarid, E, Silveira, D M, So, C, Storey, J W, Thompson, R I, Van Der Werf, D P, Wurtele, J S, Yamazaki, Y

“…Atoms made of a particle and an antiparticle are unstable, usually surviving less than a microsecond. Antihydrogen, made entirely of antiparticles, is believed…”
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Production and detection of cold antihydrogen atoms by Hangst, J. S, Amoretti, M, Amsler, C, Bonomi, G, Bouchta, A, Bowe, P, Carraro, C, Cesar, C. L, Charlton, M, Collier, M. J. T, Doser, M, Filippini, V, Fine, K. S, Fontana, A, Fujiwara, M. C, Funakoshi, R, Genova, P, Hayano, R. S, Holzscheiter, M. H, Jørgensen, L. V, Lagomarsino, V, Landua, R, Lindelöf, D, Rizzini, E. Lodi, Macrì, M, Madsen, N, Manuzio, G, Marchesotti, M, Montagna, P, Pruys, H, Regenfus, C, Riedler, P, Rochet, J, Rotondi, A, Rouleau, G, Testera, G, Variola, A, Watson, T. L, van der Werf, D. P

“…A theoretical underpinning of the standard model of fundamental particles and interactions is CPT invariance, which requires that the laws of physics be…”
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Compression of positron clouds in the independent particle regime by Isaac, C A, Baker, C J, Mortensen, T, van der Werf, D P, Charlton, M

“…The application of an asymmetric dipolar electric field rotating at a frequency close to that of the axial bounce of a collection of trapped positrons has, in…”
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Erratum: Observation of the hyperfine spectrum of antihydrogen by Ahmadi, M., Alves, B. X. R., Baker, C. J., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C. L., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayden, M. E., Isaac, C. A., Ishida, A., Johnson, M. A., Jones, S. A., Jonsell, S., Kurchaninov, L., Madsen, N., Mathers, M., Maxwell, D., McKenna, J. T. K., Menary, S., Michan, J. M., Momose, T., Munich, J. J., Nolan, P., Olchanski, K., Olin, A., Pusa, P., Rasmussen, C. Ø., Robicheaux, F., Sacramento, R. L., Sameed, M., Sarid, E., Silveira, D. M., Stracka, S., Stutter, G., So, C., Tharp, T. D., Thompson, J. E., Thompson, R. I., van der Werf, D. P., Wurtele, J. S.

“…Nature 548, 66–69 (2017); doi:10.1038/nature23446 Owing to a technical error, author J. S. Wurtele was listed incorrectly as a corresponding author instead of…”
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Three-dimensional annihilation imaging of trapped antiprotons by Fujiwara, M C, Amoretti, M, Bonomi, G, Bouchta, A, Bowe, P D, Carraro, C, Cesar, C L, Charlton, M, Doser, M, Filippini, V, Fontana, A, Funakoshi, R, Genova, P, Hangst, J S, Hayano, R S, Jørgensen, L V, Lagomarsino, V, Landua, R, Lodi-Rizzini, E, Marchesotti, M, Macri, M, Madsen, N, Manuzio, G, Montagna, P, Riedler, P, Rotondi, A, Rouleau, G, Testera, G, Variola, A, van der Werf, D P, Yamazaki, Y

“…We demonstrate three-dimensional imaging of antiprotons in a Penning trap, by reconstructing annihilation vertices from the trajectories of the charged…”
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Further evidence for low-energy protonium production in vacuum by Lodi Rizzini, E., Venturelli, L., Zurlo, N., Charlton, M., Amsler, C., Bonomi, G., Canali, C., Carraro, C., Fontana, A., Genova, P., Hayano, R., Jørgensen, L. V., Kellerbauer, A., Lagomarsino, V., Landua, R., Macrí, M., Manuzio, G., Montagna, P., Regenfus, C., Rotondi, A., Testera, G., Variola, A., van der Werf, D. P.

“…We describe an experiment performed in the ATHENA apparatus in which there is evidence that the antiproton-proton bound state, protonium, has been produced at…”
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Antimatter plasmas in a multipole trap for antihydrogen by Andresen, G, Bertsche, W, Boston, A, Bowe, P D, Cesar, C L, Chapman, S, Charlton, M, Chartier, M, Deutsch, A, Fajans, J, Fujiwara, M C, Funakoshi, R, Gill, D R, Gomberoff, K, Hangst, J S, Hayano, R S, Hydomako, R, Jenkins, M J, Jørgensen, L V, Kurchaninov, L, Madsen, N, Nolan, P, Olchanski, K, Olin, A, Povilus, A, Robicheaux, F, Sarid, E, Silveira, D M, Storey, J W, Telle, H H, Thompson, R I, van der Werf, D P, Wurtele, J S, Yamazaki, Y

“…We have demonstrated storage of plasmas of the charged constituents of the antihydrogen atom, antiprotons and positrons, in a Penning trap surrounded by a…”
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In situ electromagnetic field diagnostics with an electron plasma in a Penning-Malmberg trap by Amole, C, Ashkezari, M D, Baquero-Ruiz, M, Bertsche, W, Butler, E, Capra, A, Cesar, C L, Charlton, M, Deller, A, Evetts, N, Eriksson, S, Fajans, J, Friesen, T, Fujiwara, M C, Gill, D R, Gutierrez, A, Hangst, J S, Hardy, W N, Hayden, M E, Isaac, C A, Jonsell, S, Kurchaninov, L, Little, A, Madsen, N, McKenna, J T K, Menary, S, Napoli, S C, Olchanski, K, Olin, A, Pusa, P, Rasmussen, C Ø, Robicheaux, F, Sarid, E, Silveira, D M, So, C, Stracka, S, Tharp, T, Thompson, R I, van der Werf, D P, Wurtele, J S

“…We demonstrate a novel detection method for the cyclotron resonance frequency of an electron plasma in a Penning-Malmberg trap. With this technique, the…”
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Antihydrogen annihilation reconstruction with the ALPHA silicon detector by Andresen, G.B., Ashkezari, M.D., Bertsche, W., Bowe, P.D., Butler, E., Cesar, C.L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M.C., Gill, D.R., Gutierrez, A., Hangst, J.S., Hardy, W.N., Hayden, M.E., Hayano, R.S., Humphries, A.J., Hydomako, R., Jonsell, S., Jørgensen, L.V., Kurchaninov, L., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Sarid, E., Seif el Nasr, S., Silveira, D.M., So, C., Storey, J.W., Thompson, R.I., van der Werf, D.P., Yamazaki, Y.

“…The ALPHA experiment has succeeded in trapping antihydrogen, a major milestone on the road to spectroscopic comparisons of antihydrogen with hydrogen. An…”
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Spatial distribution of cold antihydrogen formation by MADSEN, N, AMORETTI, M, FUJIWARA, M. C, FUNAKOSHI, R, GENOVA, P, HANGST, J. S, HAYANO, R. S, JØRGENSEN, L. V, KELLERBAUER, A, LAGOMARSINO, V, LANDUA, R, LODI-RIZZINI, E, AMSLER, C, MACRI, M, MITCHARD, D, MONTAGNA, P, PRUYS, H, REGENFUS, C, ROTONDI, A, TESTERA, G, VARIOLA, A, VENTURELLI, L, VAN DER WERF, D. P, BONOMI, G, YAMAZAKI, Y, ZURLO, N, BOWE, P. D, CARRARO, C, CESAR, C. L, CHARLTON, M, DOSER, M, FONTANA, A

“…Antihydrogen is formed when antiprotons are mixed with cold positrons in a nested Penning trap. We present experimental evidence, obtained using our…”
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Antihydrogen for precision tests in physics by Charlton, M., Jonsell, S., Jørgensen, L. V., Madsen, N., van der Werf, D. P.

“…The creation of atoms of antihydrogen under controlled conditions has opened up a new era in physics with antimatter. We describe the experimental realisation…”
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Investigation of the fine structure of antihydrogen by Ahmadi, M, Alves, B. X. R, Baker, C. J, Bertsche, W, Capra, A, Carruth, C, Cesar, C. L

“…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…”
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Positron plasma diagnostics and temperature control for antihydrogen production by Amoretti, M, Amsler, C, Bonomi, G, Bouchta, A, Bowe, P D, Carraro, C, Cesar, C L, Charlton, M, Doser, M, Filippini, V, Fontana, A, Fujiwara, M C, Funakoshi, R, Genova, P, Hangst, J S, Hayano, R S, Jørgensen, L V, Lagomarsino, V, Landua, R, Lindelöf, D, Rizzini, E Lodi, Macrí, M, Madsen, N, Manuzio, G, Montagna, P, Pruys, H, Regenfus, C, Rotondi, A, Testera, G, Variola, A, van der Werf, D P

“…Production of antihydrogen atoms by mixing antiprotons with a cold, confined, positron plasma depends critically on parameters such as the plasma density and…”
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Observation of the 1S–2P Lyman-α transition in antihydrogen by Ahmadi, M., Alves, B. X. R., Baker, C. J., Bertsche, W., Capra, A., Carruth, C., Cesar, C. L., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayden, M. E., Hunter, E. D., Isaac, C. A., Johnson, M. A., Jones, J. M., Jones, S. A., Jonsell, S., Khramov, A., Knapp, P., Kurchaninov, L., Madsen, N., Maxwell, D., McKenna, J. T. K., Menary, S., Michan, J. M., Momose, T., Munich, J. J., Olchanski, K., Olin, A., Pusa, P., Rasmussen, C. Ø., Robicheaux, F., Sacramento, R. L., Sameed, M., Sarid, E., Silveira, D. M., Starko, D. M., Stutter, G., So, C., Tharp, T. D., Thompson, R. I., van der Werf, D. P., Wurtele, J. S.

“…In 1906, Theodore Lyman discovered his eponymous series of transitions in the extreme-ultraviolet region of the atomic hydrogen spectrum 1 , 2 . The patterns…”
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Description and first application of a new technique to measure the gravitational mass of antihydrogen by Charman, A. E.

“…Physicists have long wondered whether the gravitational interactions between matter and antimatter might be different from those between matter and itself…”
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