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Determination of the antiproton-to-electron mass ratio by precision laser spectroscopy of $\overline{p}He^{+}$
/ Hori, M (Univ. Tokyo ; CERN) ; Dax, A (Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan) ; Eades, John (Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan) ; Gomikawa, K (Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan) ; Hayano, R S (Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan) ; Ono, N (Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan) ; Pirkl, Werner (Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan) ; Widmann, E (Stefan Meyer Institut für Subatomare Physik, Boltzmanngasse 3, Vienna 1090, Austria) ; Torii, H A (Institute of Physics, University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan) ; Juhász, B (Stefan Meyer Institut für Subatomare Physik, Boltzmanngasse 3, Vienna 1090, Austria ; 5Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, Hungary) et al.
A femtosecond optical frequency comb and continuous-wave pulse- amplified laser were used to measure 12 transition frequencies of antiprotonic helium to fractional precisions of (9-16) 10/sup -9lifetimes hitherto unaccessible to our precision laser spectroscopy method. Comparisons with three-body QED calculations yielded an antiproton-to-electron mass ratio of M/sub pmacron//m/sub e/=1836.152 674(5)..
2006
- Published in : Phys. Rev. Lett. 96 (2006) 243401/1-4
APS Published version, local copy: PDF;
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2.
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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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3.
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Science Case for the new High-Intensity Muon Beams HIMB at PSI
/ Aiba, M. (PSI, Villigen) ; Amato, A. (PSI, Villigen) ; Antognini, A. (PSI, Villigen ; Zurich, ETH) ; Ban, S. (Tokyo U., ICEPP) ; Berger, N. (U. Mainz, PRISMA) ; Caminada, L. (PSI, Villigen ; Zurich U.) ; Chislett, R. (University Coll. London) ; Crivelli, P. (Zurich, ETH) ; Crivellin, A. (PSI, Villigen ; Zurich U.) ; Maso, G. Dal (PSI, Villigen ; Zurich, ETH) et al.
In April 2021, scientists active in muon physics met to discuss and work out the physics case for the new High-Intensity Muon Beams (HIMB) project at PSI that could deliver of order $10^{10}$ s$^{-1}$ surface muons to experiments. [...]
arXiv:2111.05788.
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116.
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4.
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Shower Separation in Five Dimensions for Highly Granular Calorimeters using Machine Learning
/ CALICE Collaboration
To achieve state-of-the-art jet energy resolution for Particle Flow, sophisticated energy clustering algorithms must be developed that can fully exploit available information to separate energy deposits from charged and neutral particles. Three published neural network-based shower separation models were applied to simulation and experimental data to measure the performance of the highly granular CALICE Analogue Hadronic Calorimeter (AHCAL) technological prototype in distinguishing the energy deposited by a single charged and single neutral hadron for Particle Flow. [...]
arXiv:2407.00178.-
2024-10-24 - 29 p.
- Published in : JINST 19 (2024) P10027
Fulltext: 2407.00178 - PDF; document - PDF;
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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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$\beta^-$ decay study of the $^{66}$Mn $-$ $^{66}$Fe $-$ $^{66}$Co $-$ $^{66}$Ni decay chain
/ Stryjczyk, M. (KU Leuven, Dept. Phys. Astron.) ; Tsunoda, Y. (Tokyo U., CNS) ; Darby, I.G. (KU Leuven, Dept. Phys. Astron.) ; De Witte, H. (KU Leuven, Dept. Phys. Astron.) ; Diriken, J. (KU Leuven, Dept. Phys. Astron.) ; Fedorov, D.V. (St. Petersburg, INP) ; Fedosseev, V.N. (CERN) ; Fraile, L.M. (UCM, Madrid, Dept. Phys.) ; Huyse, M. (KU Leuven, Dept. Phys. Astron.) ; Köster, U. (Laue-Langevin Inst.) et al.
Background: Shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around $^{68}$Ni represent an excellent study case, however, spectroscopic information of the neutron-rich, $Z<28$ nuclei is limited. [...]
arXiv:1812.07510.-
2018-12-28 - 21 p.
- Published in : Phys. Rev. C 98 (2018) 064326
Fulltext: PDF;
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Overview of recent ALICE results
/ Gunji, Taku (Tokyo U.)
/on behalf of the ALICE Collaboration
The ALICE experiment explores the properties of strongly interacting QCD matter at extremely high temperatures created in Pb-Pb collisions at LHC and provides further insight into small-system physics in (high-multiplicity) pp and p-Pb collisions. The ALICE collaboration presented 27 parallel talks, 50 posters, and 1 flash talk at Quark Matter 2015 and covered various topics including collective dynamics, correlations and fluctuations, heavy flavors, quarkonia, jets and high $p_{\rm T}$ hadrons, electromagnetic probes, small system physics, and the upgrade program. [...]
arXiv:1604.02773.-
2016-12 - 8 p.
- Published in : Nucl. Phys. A 956 (2016) 11-18
Fulltext: PDF; External link: Preprint
In : 25th International Conference on Ultra-relativistic Nucleus-nucleus Collisions, Kobe, Japan, 27 Sep - 4 Oct 2015, pp.11-18
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Segmented scintillation detectors with silicon photomultiplier readout for measuring antiproton annihilations
/ Sótér, A. (Munich, Max Planck Inst. Quantenopt.) ; Todoroki, K. (Tokyo U.) ; Kobayashi, T. (Tokyo U.) ; Barna, D. (Tokyo U. ; Wigner RCP, Budapest) ; Horváth, D. (Wigner RCP, Budapest) ; Hori, M. (Munich, Max Planck Inst. Quantenopt. ; Tokyo U.)
The Atomic Spectroscopy and Collisions Using Slow Antiprotons (ASACUSA) experiment at the Antiproton Decelerator (AD) facility of CERN constructed segmented scintillators to detect and track the charged pions which emerge from antiproton annihilations in a future superconducting radiofrequency Paul trap for antiprotons. A system of 541 cast and extruded scintillator bars were arranged in 11 detector modules which provided a spatial resolution of 17 mm. [...]
arXiv:1403.0451.-
2014 - 10 p.
- Published in : Rev. Sci. Instrum. 85 (2014) 023302
Fulltext: PDF; External link: Preprint
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10.
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Enhanced Quadrupole and Octupole Strength in Doubly Magic $^{132}$Sn
/ Rosiak, D. (Cologne U.) ; Seidlitz, M. (Cologne U.) ; Reiter, P. (Cologne U.) ; Naïdja, H. (Constantine U. ; Strasbourg, IPHC) ; Tsunoda, Y. (Tokyo U., CNS) ; Togashi, T. (Tokyo U., CNS) ; Nowacki, F. (Strasbourg, IPHC) ; Otsuka, T. (Michigan State U., NSCL ; KU Leuven, Dept. Phys. Astron. ; Tokyo U., CNS ; Tokyo U.) ; Colò, G. (INFN, Milan ; Milan U.) ; Arnswald, K. (Cologne U.) et al.
/MINIBALL ; HIE-ISOLDE
The first $2^+$ and $3^-$ states of the doubly magic nucleus $^{132}$Sn are populated via safe Coulomb excitation employing the recently commissioned HIE-ISOLDE accelerator at CERN in conjunction with the highly efficient MINIBALL array. The $^{132}$Sn ions are accelerated to an energy of 5.49 MeV/nucleon and impinged on a $^{206}$Pb target. [...]
2018-12-18 - 6 p.
- Published in : 10.1103/PhysRevLett.121.252501
Fulltext: PDF;
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