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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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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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3.
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Laser spectroscopic studies of long-lived pionic helium at PSI
/ Hori, M (Munich, Max Planck Inst. Quantenopt.) ; Aghai-Khozani, H (Munich, Max Planck Inst. Quantenopt. ; CERN ; Cambridge U., DAMTP) ; Soter, A (Munich, Max Planck Inst. Quantenopt. ; Zurich, ETH) ; Dax, A (PSI, Villigen) ; Barna, D (CERN ; Wigner RCP, Budapest)
A recent laser spectroscopy experiment of three-body pionic helium atoms which was carried out using the 590 MeV ring cyclotron facility of the Paul Scherrer Institute (PSI) is briefly reviewed. The charged pion mass may be precisely determined by measuring the transition frequency of the pionic atom and comparing the results with quantum electrodynamics (QED) calculations. [...]
2022 - 5 p.
- Published in : J. Phys. : Conf. Ser. 2374 (2022) 012039
Fulltext: PDF;
In : International Conference on Technology and Instrumentation in Particle Physics (TIPP 2021), Online, Canada, 24 - 29 May 2021, pp.012039
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4.
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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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5.
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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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6.
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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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7.
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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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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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Measurement of the antiproton–nucleus annihilation cross-section at low energy
/ Aghai-Khozani, H (Munich, Max Planck Inst. Quantenopt.) ; Bianconi, A (U. Brescia ; INFN, Pavia) ; Corradini, M (U. Brescia ; INFN, Pavia) ; Hayano, R (Tokyo U.) ; Hori, M (Munich, Max Planck Inst. Quantenopt. ; Tokyo U.) ; Leali, M (U. Brescia ; INFN, Pavia) ; Lodi Rizzini, E (U. Brescia ; INFN, Pavia) ; Mascagna, V (U. Brescia ; INFN, Pavia) ; Murakami, Y (Tokyo U.) ; Prest, M (INFN, Milan Bicocca ; Insubria U., Como) et al.
Systematic measurements of the annihilation cross sections of low energy antinucleons were performed at CERN in the 80's and 90's. However the antiproton data on medium-heavy and heavy nuclear targets are scarce. [...]
2018 - 13 p.
- Published in : Nucl. Phys. A 970 (2018) 366-378
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10.
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Recent Results on the Antiproton-Nucleus Annihilation Cross Section at Low Energy
/ Aghai-Khozani, H ; Corradini, M ; Hayano, R ; Hori, M ; Leali, M ; Lodi-Rizzini, E ; Mascagna, V ; Murakami, Y ; Prest, M ; Vallazza, E et al.
Measurements of the antinucleon-nuclei annihilation cross section (σ_ann) at very low energies have been performed at CERN during the 80’s and 90’s with the LEAR facility and more recently with the Antiproton Decelerator. One of the unexplained results is the behaviour of the antineutron data on several nuclei (C, Al, Cu, Ag, Sn, Pb) at momenta below 180 MeV/c [1], where the σ_ann values, as a function of energy, have a steep rise typical of low-energy charged projectiles [2]. [...]
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011036
External link: Fulltext
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011036
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