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Laser spectroscopy of long-lived antiprotonic and pionic helium in superfluid helium
/ Hori, M (Mainz U. ; Munich, Max Planck Inst. Quantenopt.) ; Aghai-Khozani, H (Mainz U.) ; Sótér, A (Mainz U.) ; Dax, A (PSI, Villigen) ; Barna, D (CERN) ; Venturelli𝑒, L (INFN, Pavia ; Brescia U.)
The PiHe collaboration of PSI recently carried out laser spectroscopy of an infrared transition in three-body pionic helium atoms that were synthesized in a superfluid (He-II) helium target. Analogous measurements of antiprotonic helium atoms embedded in liquid helium were carried out by the ASACUSA collaboration of CERN. [...]
2022 - 6 p.
- Published in : PoS: ICHEP2022, pp. 141
Fulltext: PDF;
In : 41st International Conference on High Energy Physics (ICHEP 2022), Bologna, Italy, 6 - 13 Jul 2022, pp.141
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2.
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Laser Spectroscopy Measurements of Metastable Pionic Helium Atoms at Paul Scherrer Institute
/ Hori, M (Max Planck Inst. Quantenopt.) ; Aghai-Khozani, H (Max Planck Inst. Quantenopt. ; Unlisted, DE) ; Sótér, A (Zurich, ETH) ; Dax, A (PSI, Villigen) ; Barna, D (CERN ; Wigner RCP, Budapest)
We review recent experiments carried out by the PiHe collaboration of the Paul Scherrer Institute (PSI) that observed an infrared transition of three-body pionic helium atoms by laser spectroscopy. These measurements may lead to a precise determination of the charged pion mass, and complement experiments of antiprotonic helium atoms carried out at the new ELENA facility of CERN..
2021 - 6 p.
- Published in : Few-Body Syst. 62 (2021) 63
Fulltext: PDF;
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3.
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Recent progress of laser spectroscopy measurements of pionic helium
/ Hori, Masaki (Munich, Max Planck Inst. Quantenopt. ; Munich U.) ; Aghai-Khozani, Hossein (Munich, Max Planck Inst. Quantenopt.) ; Sótér, Anna (Munich, Max Planck Inst. Quantenopt.) ; Dax, Andreas (PSI, Villigen) ; Barna, Dániel (CERN)
We review the results of recent laser spectroscopy experiments on metastable pionic helium atoms at the Paul Scherrer Institute’s 590 MeV cyclotron facility that was carried out by the PiHe collaboration. Some future perspectives are briefly discussed..
2022 - 8 p.
- Published in : EPJ Web Conf. 262 (2022) 01004
Fulltext: PDF;
In : 7th International Conference on Exotic Atoms and Related Topics, Online, 13 - 17 Sep 2021, pp.01004
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4.
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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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5.
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Buffer-gas cooling of antiprotonic helium to 1.5 to 1.7 K, and antiproton-to–electron mass ratio
/ Hori, Masaki (Munich, Max Planck Inst. Quantenopt.) ; Aghai-Khozani, Hossein (Munich, Max Planck Inst. Quantenopt.) ; Sótér, Anna (Munich, Max Planck Inst. Quantenopt.) ; Barna, Daniel (Wigner RCP, Budapest) ; Dax, Andreas (Tokyo U.) ; Hayano, Ryugo (Tokyo U.) ; Kobayashi, Takumi (Tokyo U.) ; Murakami, Yohei (Tokyo U.) ; Todoroki, Koichi (Tokyo U.) ; Yamada, Hiroyuki (Tokyo U.) et al.
Charge, parity, and time reversal (CPT) symmetry implies that a particle and its antiparticle have the same mass. The antiproton-to-electron mass ratio Embedded Image can be precisely determined from the single-photon transition frequencies of antiprotonic helium. [...]
2016
- Published in : Science 354 (2016) 610-614
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High-resolution laser resonances of antiprotonic helium in superfluid $^{4}$He
/ Sótér, Anna (Munich, Max Planck Inst. Quantenopt. ; Zurich, ETH) ; Aghai-Khozani, Hossein (Munich, Max Planck Inst. Quantenopt.) ; Barna, Dániel (CERN ; Wigner RCP, Budapest) ; Dax, Andreas (CERN ; PSI, Villigen) ; Venturelli, Luca (U. Brescia ; INFN, Pavia) ; Hori, Masaki (Munich, Max Planck Inst. Quantenopt. ; Munich U.)
When atoms are placed into liquids, their optical spectral lines corresponding to the electronic transitions are greatly broadened compared to those of single, isolated atoms. This linewidth increase can often reach a factor of more than a million, obscuring spectroscopic structures and preventing high-resolution spectroscopy, even when superfluid helium, which is the most transparent, cold and chemically inert liquid, is used as the host material. [...]
2022 - 14 p.
- Published in : Nature 603 (2022) 411-415
Fulltext: PDF; External link: Interactions.org article
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Recent results of laser spectroscopy experiments of pionic helium atoms at PSI
/ HORI, Masaki (Munich, Max Planck Inst. Quantenopt.) ; Aghai-Khozani, H (Munich, Max Planck Inst. Quantenopt.) ; Sótér, Anna (Munich, Max Planck Inst. Quantenopt.) ; Dax, Andreas (PSI, Villigen) ; Barna, Daniel (CERN)
A review of a recent experiment carried out at PSI involving laser spectroscopy of metastable pionic helium $(\pi^4\textrm{He}^+ \equiv \pi^- + ^4\textrm{He}^{2+}+e^-)$ atoms is presented. An infrared transition $(n, \ell ) = (17,16) \to (17, 15)$ at a resonance frequency of $\nu \approx 183760$ GHz was detected..
2021 - 11 p.
- Published in : SciPost Phys. Proc. 5 (2021) 026
Fulltext: PDF;
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8.
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Laser spectroscopy of pionic helium atoms
/ Hori, Masaki (Munich, Max Planck Inst. Quantenopt.) ; Aghai-Khozani, Hossein (Munich, Max Planck Inst. Quantenopt.) ; Sótér, Anna (Munich, Max Planck Inst. Quantenopt. ; Zurich, ETH) ; Dax, Andreas (PSI, Villigen) ; Barna, Daniel (CERN ; Wigner RCP, Budapest)
Long-lived pionic helium atoms (composed of a helium-4 nucleus, an electron and a negatively charged pion) are synthesized in a superfluid-helium target, as confirmed by laser spectroscopy involving the pion-occupied orbitals..
2020 - 7 p.
- Published in : Nature 581 (2020) 37-41
External link: PHYSORG
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9.
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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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10.
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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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