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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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ELENA Commissioning
/ Gamba, Davide (CERN) ; Angoletta, Maria Elena (CERN) ; Belochitskii, P (CERN) ; Bojtár, Lajos (CERN) ; Butin, Francois (CERN) ; Carli, Christian (CERN) ; Dupuy, Bruno (CERN) ; Dutheil, Yann (CERN) ; Eriksson, Tommy (CERN) ; Freyermuth, Pierre (CERN) et al.
The Extra Low ENergy Antiproton storage ring (ELENA) is an upgrade project at the CERN AD (Antiproton Decelerator). ELENA will further decelerate the 5.3 MeV antiprotons coming from the AD down to 100 keV. [...]
2020 - 6 p.
- Published in : 10.18429/JACoW-NAPAC2019-WEYBB1
Fulltext: PDF;
In : 3rd North American Particle Accelerator Conference (NAPAC), Lansing, MI, USA, 2 - 6 Sep 2019, pp.626-631
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Commissioning of the SEM-Grid Monitors for ELENA
/ McLean, Mark (CERN) ; Cenede, Jean (CERN) ; Hori, Masaki (Munich, Max Planck Inst. Quantenopt.) ; Tranquille, Gerard (CERN)
ELENA is a compact ring for cooling and further deceleration of 5.3 MeV antiprotons delivered by the CERN Antiproton Decelerator. It decelerates antiprotons to a minimum energy of 100 keV, creating special challenges for the beam instrumentation. [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IBIC 2021 (2021) 223-226
Fulltext: PDF;
In : 10th International Beam Instrumentation Conference (IBIC 2021), Online, Korea, 13 - 17 Sep 2021, pp.223-226
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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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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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