Decay of negative muons bound in $^{27}$Al (2009)
Grossheim, A., Bayes, R., Bueno, J. F., Depommier, P., Faszer, W., Fujiwara, M. C., ...
We present the first measurement of the energy spectrum up to 70 MeV of electrons from the decay of negative muons after they become bound in $^{27}$Al atoms. The data were taken with the TWIST...
The ALPHA Experiment: A Cold Antihydrogen Trap (2008)
W. Bertsche, A. Boston, P. D. Bowe, C. L. Cesar, S. Chapman, M. Chartier, ...
Abstract. The ALPHA experiment aims to trap antihydrogen as the next crucial step towards a precise CPT test, by a spectroscopic comparison of antihydrogen with hydrogen. The experiment will retain...
A Precision Measurement of the Muon Decay Parameters $\rho$ and $\delta$ (2008)
Bayes, R., Bueno, J., Davydov, Yu. I., Depommier, P., Faszer, W., ...
The TWIST collaboration has performed new measurements of two of the parameters that describe muon decay: $\rho$, which governs the shape of the overall momentum spectrum, and $\delta$, which governs...
A novel antiproton radial diagnostic based on octupole induced ballistic loss (2008)
Andresen, G. B., Bertsche, W., Bowe, P. D., Bray, C. C., Butler, E., Cesar, C. L., ...
We report results from a novel diagnostic that probes the outer radial profile of trapped antiproton clouds. The diagnostic allows us to determine the profile by monitoring the time-history of...
Production of antihydrogen at reduced magnetic field for anti-atom trapping (2008)
Andresen, G B, Bertsche, W, Boston, A, Bowe, P D, Cesar, C L, Chapman, S, ...
We have demonstrated production of antihydrogen in a 1$,$T solenoidal magnetic field. This field strength is significantly smaller than that used in the first generation experiments ATHENA (3$,$T)...
Compression of Antiproton Clouds for Antihydrogen Trapping (2008)
Andresen, G. B., Bertsche, W., Bowe, P. D., Bray, C. C., Butler, E., Cesar, C. L., ...
Control of the radial profile of trapped antiproton clouds is critical to trapping antihydrogen. We report the first detailed measurements of the radial manipulation of antiproton clouds, including...
The ALPHA Experiment: A Cold Antihydrogen Trap (2008)
W. Bertsche, A. Boston, P. D. Bowe, C. L. Cesar, S. Chapman, M. Chartier, ...
Abstract. The ALPHA experiment aims to trap antihydrogen as the next crucial step towards a precise CPT test, by a spectroscopic comparison of antihydrogen with hydrogen. The experiment will retain...
Towards Antihydrogen Confinement with the ALPHA Antihydrogen Trap (2007)
Fujiwara, M. C., Andresen, G., Bertsche, W., Boston, A., Bowe, P. D., Cesar, C. L., ...
ALPHA is an international project that has recently begun experimentation at CERN's Antiproton Decelerator (AD) facility. The primary goal of ALPHA is stable trapping of cold antihydrogen atoms with...
Positron plasma control techniques for the production of cold antihydrogen (2007)
Funakoshi, R., Amoretti, M., Bonomi, G., Bowe, P. D., Canali, C., Carraro, C., ...
An observation of a clear dependence of antihydrogen production on positron plasma shapes is reported. For this purpose a plasma control method has been developed combining the plasma rotating-wall...
G B Andresen, W Bertsche, S Chapman, M Charlton, A Deutsch, M C Fujiwara, ...
We have demonstrated production of antihydrogen in a 1 T solenoidal magnetic field. This field strength is significantly smaller than that used in the first generation experiments ATHENA (3 T) and...
Ramsauer-Townsend effect in muonic atom scattering (2006)
Mulhauser, Françoise, Adamczak, A., Beer, G. A., Bystritsky, V. M., Filipowicz, M., Fujiwara, M. C., ...
We present the final results of an experimental study of µd and µt atom scattering in solid hydrogen cooled to 3 K. Strong effects resulting from the Ramsauer-Townsend effect have been observed in...
Ramsauer-Townsend effect in muonic atom scattering (2006)
Mulhauser, Françoise, Adamczak, A., Beer, G. A., Bystritsky, V. M., Filipowicz, M., Fujiwara, M. C., ...
We present the final results of an experimental study of µd and µt atom scattering in solid hydrogen cooled to 3 K. Strong effects resulting from the Ramsauer-Townsend effect have been observed in...
Measurement of P_{mu}xi in Polarized Muon Decay (2006)
Jamieson, TWIST Collaboration: B., Bayes, R., Davydov, Yu. I., Depommier, P., Doornbos, J., Faszer, W., ...
The quantity P_{mu}^{pi}xi, where xi is one of the muon decay parameters and $P_{\mu}^{\pi}$ is the degree of muon polarization in pion decay, has been measured. The value P_{mu}^{pi}xi = 1.0003 +-...
Cold-Antimatter Physics (2005)
Amoretti, ATHENA Collaboration: M., Amsler, C., Bonomi, G., Bowe, P. D., Canali, C., Carraro, C., ...
The CPT theorem and the Weak Equivalence Principle are foundational principles on which the standard description of the fundamental interactions is based. The validity of such basic principles should...
ATHENA : First Production of Cold Antihydrogen and Beyond (2004)
Kellerbauer, A G, Amoretii, M, Amsler, Claude, Bonomi, G, Bowe, P, Canali, C, ...
Atomic systems of antiparticles are the laboratories of choice for tests of CPT symmetry with antimatter. The ATHENA experiment was the first to report the production of copious amounts of cold...
ATHENA -- First Production of Cold Antihydrogen and Beyond (2004)
Kellerbauer, ATHENA Collaboration: A., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P. D., Canali, C., ...
Atomic systems of antiparticles are the laboratories of choice for tests of CPT symmetry with antimatter. The ATHENA experiment was the first to report the production of copious amounts of cold...
Production of Cold Antihydrogen with ATHENA for Fundamental Studies (2004)
Kellerbauer, A G, Kellerbauer, A G, Amoretti, M, Amsler, Claude, Bonomi, G, Bowe, P, ...
Since the beginning of operations of the CERN Antiproton Decelerator in July 2000, the successful deceleration, storage and manipulation of antiprotons has led to remarkable progress in the...
Production of Cold Antihydrogen with ATHENA for Fundamental Studies (2004)
Kellerbauer, ATHENA Collaboration: A., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P. D., Canali, C., ...
Since the beginning of operations of the CERN Antiproton Decelerator in July 2000, the successful deceleration, storage and manipulation of antiprotons has led to remarkable progress in the...
The ATHENA Antihydrogen Apparatus (2004)
Amoretti, M, Amsler, Claude, Bonomi, G, Bouchta, A, Bowe, P, Carraro, C, ...
The ATHENA apparatus that recently produced and detected the first cold antihydrogen atoms is described. Its main features, which are described herein, are: an external positron accumulator, making...
The First Cold Antihydrogen (2004)
Fujiwara, M C, Amoretti, M, Amsler, Claude, Bonomi, G, Bouchta, A, Bowe, P, ...
Antihydrogen, the atomic bound state of an antiproton and a positron, was produced at low energy for the first time by the ATHENA experiment, marking an important first step for precision studies of...
The First Cold Antihydrogen (2004)
Fujiwara, M. C., Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P. D., ...
Antihydrogen, the atomic bound state of an antiproton and a positron, was produced at low energy for the first time by the ATHENA experiment, marking an important first step for precision studies of...
Three Dimensional Annihilation Imaging of Antiprotons in a Penning Trap (2004)
Fujiwara, M. C., Amoretti, M., Bonomi, G., Bouchta, A., Bowe, P. D., Carraro, C., ...
We demonstrate three-dimensional annihilation imaging of antiprotons trapped in a Penning trap. Exploiting unusual feature of antiparticles, we investigate a previously unexplored regime in particle...
Detection of antihydrogen annihilations with a Si-micro-strip and pure CsI detector (2004)
Johnson, I, Amoretti, M, Amsler, Claude, Bazzano, G, Bonomi, G, Bouchta, A, ...
In 2002, the ATHENA collaboration reported the creation and detection of cold (~15 K) antihydrogen atoms [1]. The observation was based on the complete reconstruction of antihydrogen annihilations,...
Positron plasma diagnostics and temperature control for antihydrogen production (2003)
Amoretti, M, Amsler, Claude, Bonomi, G, Bouchta, A, Bowe, P, Carraro, C, ...
Production of antihydrogen atoms by mixing antiprotons with a cold, confined, positron plasma depends critically on parameters such as the plasma density and temperature. We discuss non-destructive...
Positron plasma diagnostics and temperature control for antihydrogen production (2003)
Amoretti, ATHENA Collaboration: M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P. D., Carraro, C., ...
Production of antihydrogen atoms by mixing antiprotons with a cold, confined, positron plasma depends critically on parameters such as the plasma density and temperature. We discuss non-destructive...
First Production and Detection of Cold Antihydrogen Atoms (2003)
Fujiwara, M C, Amoretti, M, Amsler, Claude, Bonomi, G, Bouchta, A, Bowe, P, ...
The ATHENA experiment recently produced the first atoms of cold antihydrogen. This paper gives a brief review of how this was achieved.
First Production and Detection of Cold Antihydrogen Atoms (2003)
Fujiwara, M. C., Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., ...
The ATHENA experiment recently produced the first atoms of cold antihydrogen. This paper gives a brief review of how this was achieved.
Scattering of p$\mu$ muonic atoms in solid hydrogen (2002)
Wozniak, J., Adamczak, A., Beer, G. A., Bystritsky, V. M., Filipowicz, M., Fujiwara, M. C., ...
We present the results of experimental and theoretical study of the scattering of low energy p$\mu$ atoms in solid hydrogen cooled to 3 K. The resulting emission of low energy p$\mu$ atoms from the...
A novel current mode operating beam counter based on not preamplified HPDs (2002)
A novel system to monitor the intensity and the stability of a bunched beam of $\simeq 1.2\times 10^{7}$ antiprotons ($\bar{p}$s) with a length of $\simeq$ 250 ns (FWHM) and to measure its trapping...
A novel current mode operating beam counter based on not preamplified HPDs (2002)
Fujiwara, M. C., Marchesotti, M.
A novel system to monitor the intensity and the stability of a bunched beam of $\simeq 1.2\times 10^{7}$ antiprotons ($\bar{p}$s) with a length of $\simeq$ 250 ns (FWHM) and to measure its trapping...
Production and detection of cold antihydrogen atoms (2002)
Amoretti, M, Amsler, Claude, Bonomi, G, Bouchta, A, Bowe, P, Carraro, C, ...
A theoretical underpinning of the standard model of fundamental particles and interactions is CPT invariance, which requires that the laws of physics be invariant under the combined discrete...
Producing Slow Antihydrogen for a Test of CPT Symmetry with ATHENA (2002)
Fujiwara, M C, Amoretti, M, Amsler, Claude, Bendiscioli, G, Bonomi, G, Bouchta, A, ...
The ATHENA experiment at the Antiproton Decelerator facility at CERN aims at testing CPT symmetry with antihydrogen. An overview of the experiment, together with preliminary results of development...
Measurement of the Resonant $d\mu t$ Molecular Formation Rate in Solid HD (2001)
Porcelli, T. A., Adamczak, A., Bailey, J. M., Beer, G. A., Douglas, J. L., Faifman, M. P., ...
Measurements of muon-catalyzed dt fusion ($d\mu t \to ^4He+n+\mu^-$) in solid HD have been performed. The theory describing the energy dependent resonant molecular formation rate for the reaction...
Muon Catalyzed Fusion in 3 K Solid Deuterium (1997)
Knowles, P. E., Adamczak, A., Bailey, J. M., Beer, G. A., Beveridge, J. L., Fujiwara, M. C., ...
Muon catalyzed fusion in deuterium has traditionally been studied in gaseous and liquid targets. The TRIUMF solid-hydrogen-layer target system has been used to study the fusion reaction rates in the...
Measuring sticking and stripping in muon catalyzed dt fusion with multilayer thin films (1996)
Fujiwara, M C, Bailey, J M, Beer, G A, Beveridge, J L, Gete, E, Huber, T M, ...
Characterization of solid hydrogen targets (1996)
Fujiwara, M C, Bailey, J M, Beer, G A, Beveridge, J L, Douglas, J L, Huber, T M, ...
Muon catalyzed fusion in deuterium at 3 K (1996)
Knowles, P E, Bailey, J M, Beer, G A, Beveridge, J L, Fujiwara, M C, Huber, T M, ...
Time-of-flight measurement of resonant molecular formation in muon catalyzed dt fusion (1996)
Marshall, G M, Adamczak, A, Bailey, J M, Beer, G A, Beveridge, J L, Douglas, J L, ...
F. Mulhauser, J.L. Beveridge, G. M. Marshall, J. M. Bailey, G. A. Beer, P. E. Knowles, ...
A new approach was used to study the reactions of muonic atoms and molecules in solid layers of hydrogen isotopes. Muons stopped in a protium layer with a small admixture of tritium producing ¯p...
A new $\pi^{+}$ lifetime measurement (1995)
Numao, T, MacDonald, J A, Marshall, G M, Olin, A, Fujiwara, M C