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1.
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Limits on antiproton-nuclei annihilation cross sections at ∼125 keV
/ Aghai-Khozani, H (Munich, Max Planck Inst. Quantenopt.) ; Barna, D (Wigner RCP, Budapest ; CERN) ; Corradini, M (Brescia U. ; INFN, Pavia) ; De Salvador, D (Padua U. ; INFN, Legnaro) ; Hayano, R S (Tokyo U.) ; Hori, M (Munich, Max Planck Inst. Quantenopt.) ; Leali, M (Brescia U. ; INFN, Pavia) ; Lodi-Rizzini, E (Brescia U. ; INFN, Pavia) ; Mascagna, V (Brescia U. ; INFN, Pavia ; Insubria U., Como) ; Prest, M (Insubria U., Como ; INFN, Milan Bicocca) et al.
Some experimental limits on the annihilation cross sections $σ_{\textrm{ann}}$ of antiprotons on carbon, palladium, and platinum targets were determined at the previously unexplored kinetic energy region E≈125 keV. Information on $σ_{\textrm{ann}}$ at such low antiproton energies is important in understanding the dynamics of the annihilation process, and provides useful data for models that attempt to describe the matter-antimatter asymmetry in the universe by assuming the existence of islands of antimatter concentration..
2021 - 17 p.
- Published in : Nucl. Phys. A 1009 (2021) 122170
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2.
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Method for laser spectroscopy of metastable pionic helium atoms
/ Hori, M (Munich, Max Planck Inst. Quantenopt.) ; Sótér, A (Munich, Max Planck Inst. Quantenopt.) ; Aghai-Khozani, H (Munich, Max Planck Inst. Quantenopt.) ; Barna, D (CERN) ; Dax, A (PSI, Villigen) ; Hayano, R S (Tokyo U.) ; Murakami, Y (Tokyo U.) ; Yamada, H (Tokyo U.)
The PiHe collaboration is currently attempting to carry out laser spectroscopy of metastable pionic helium atoms using the high-intensity π$^{−}$ beam of the ring cyclotron facility of the Paul Scherrer Institute. These atoms are heretofore hypothetical three-body Coulomb systems each composed of a helium nucleus, a π$^{−}$ occupying a Rydberg state, and an electron occupying the 1s ground state. [...]
2015 - 5 p.
- Published in : Hyperfine Interact. 233 (2015) 83-87
In : 5th International Conference on Exotic Atoms and Related Topics, Vienna, Austria, 15 - 19 Sep 2014, pp.83-87
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3.
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Near-infrared laser spectroscopy of antiprotonic helium atoms
/ Kobayashi, T ; Barna, D ; Hayano, R S ; Murakami, Y ; Todoroki, K ; Yamada, H ; Dax, A ; Venturelli, L ; Zurlo, N ; Horvath, D et al.
2014 - 4 p.
- Published in : EPJ Web Conf. 66 (2014) 05010
Fulltext: PDF;
In : 25th International Nuclear Physics Conference, pp.05010
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4.
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5.
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Antihydrogen annihilation reconstruction with the ALPHA silicon detector
/ Andresen, G B (Aarhus U.) ; Ashkezari, M D (Simon Fraser U.) ; Bertsche, W (Swansea U.) ; Bowe, P D (Aarhus U.) ; Butler, E (CERN) ; Cesar, C L (Rio de Janeiro Federal U.) ; Chapman, S (UC, Berkeley) ; Charlton, M (Swansea U.) ; Deller, A (Swansea U.) ; Eriksson, S (Swansea U.) et al.
The ALPHA experiment has succeeded in trapping antihydrogen, a major milestone on the road to spectroscopic comparisons of antihydrogen with hydrogen. An annihilation vertex detector, which determines the time and position of antiproton annihilations, has been central to this achievement. [...]
2012
- Published in : Nucl. Instrum. Methods Phys. Res., A 684 (2012) 73-81
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6.
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7.
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8.
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First Attempts at Antihydrogen Trapping in ALPHA
/ Andresen, G B (Aarhus U.) ; Bertsche, W (Swansea U.) ; Bowe, P D (Aarhus U.) ; Bray, C C (UC, Berkeley) ; Butler, E (Swansea U.) ; Cesar, C L (Rio de Janeiro Federal U.) ; Chapman, S (UC, Berkeley) ; Charlton, M (Swansea U.) ; Fajans, J (UC, Berkeley) ; Funakoshi, R (Tokyo U.) et al.
We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN's Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. [...]
2008 - 8 p.
- Published in : AIP Conf. Proc. 1037 (2008) 241-248
In : Workshop on Cold Antimatter Plasmas and Application to Fundamental Physics, Okinawa, Japan, 20 - 22 Feb 2008, pp.241-248
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9.
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Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3
/ Friedreich, Susanne (Stefan Meyer Inst. Subatomare Phys.) ; Barna, Daniel (Tokyo U. ; Budapest, RMKI) ; Caspers, Fritz (CERN) ; Dax, Andreas (Tokyo U.) ; Hayano, Ryugo S (Tokyo U.) ; Hori, Masaki (Tokyo U. ; Garching, Max Planck Inst.) ; Horváth, Dezső (Budapest, RMKI ; Debrecen, Inst. Nucl. Res.) ; Juhász, Bertalan (Stefan Meyer Inst. Subatomare Phys.) ; Kobayashi, Takumi (Tokyo U.) ; Massiczek, Oswald (Stefan Meyer Inst. Subatomare Phys.) et al.
In this work we describe the latest results for the measurements of the hyperfine structure of antiprotonic helium-3. [...]
arXiv:1303.2831.
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2013. - 15 p.
Preprint
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