Chiral Symmetry Restoration in Nucleus Observed in Pionic Atoms

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Published: Dec 16, 2024
DOI: https://doi.org/10.12693/APhysPolA.146.721
Keywords:
chiral symmetry, pionic atoms, quantum chromodynamics (QCD), vacuum

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K. Itahashi
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
D. Ahn
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
G.P.A. Berg
Department of Physics and the Joint Institute for Nuclear Astrophysics Center for the Evolution of the Elements, University of Notre Dame, Notre Dame, Indiana 46556, USA
M. Dozono
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
D. Etoh
Department of Physics, Tohoku University, Sendai, Miyagi980-8578, Japan
H. Fujioka
Department of Physics, Kyoto University, Sakyo, Kyoto 606-8502, Japan
N. Fukuda
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
N. Fukunishi
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
H. Geissel
GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
E. Haettner
GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
T. Hashimoto
Cluster for Pioneering Research, RIKEN, Wako, Saitama 351-0198, Japan
R.S. Hayano
Department of Physics, School of Science, University of Tokyo, Hongo 113-0033, Tokyo, Japan
S. Hirenzaki
Department of Physics, Nara Women's University, Kita-Uoya Nishimachi, Nara 630-8506, Japan
H. Horii
Department of Physics, School of Science, University of Tokyo, Hongo 113-0033, Tokyo, Japan
N. Ikeno
Department of Life and Environmental Agricultural Sciences, Faculty of Agriculture, Tottori University, Koyamacho-Minami, Tottori 680-8551, Japan
N. Inabe
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
M. Iwasaki
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
D. Kameda
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
K. Kisamori
Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
Y. Kiyokawa
Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
T. Kubo
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
K. Kusaka
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
M. Matsushita
Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
S. Michimasa
Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
G. Mishima
Department of Physics, School of Science, University of Tokyo, Hongo 113-0033, Tokyo, Japan
H. Miya
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
D. Murai
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
H. Nagahiro
Department of Physics, Nara Women's University, Kita-Uoya Nishimachi, Nara 630-8506, Japan
M. Niikura
Department of Physics, School of Science, University of Tokyo, Hongo 113-0033, Tokyo, Japan
N. Nose-Togawa
Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
S. Ota
Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
N. Sakamoto
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
K. Sekiguchi
Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan
Y. Shiokawa
Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan
H. Suzuki
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
K. Suzuki
GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
M. Takaki
Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
H. Takeda
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
Y.K. Tanaka
Cluster for Pioneering Research, RIKEN, Wako, Saitama 351-0198, Japan
T. Uesaka
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
Y. Wada
Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan
A. Watanabe
Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan
Y.N. Watanabe
Department of Physics, School of Science, University of Tokyo, Hongo 113-0033, Tokyo, Japan
H. Weick
GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
H. Yamakami
Department of Physics, Kyoto University, Sakyo, Kyoto 606-8502, Japan
Y. Yanagisawa
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
K. Yoshida
Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan

Abstract

 We conducted experimental and theoretical studies of chiral condensate in the nuclear medium through precision spectroscopy of pionic Sn atoms and subsequent analyses. The chiral condensate at ≈ 60% of the nuclear saturation density is found to be reduced by 23 ± 2% compared to that in the vacuum.

Article Details

How to Cite
[1]
K. Itahashi, “Chiral Symmetry Restoration in Nucleus Observed in Pionic Atoms”, Acta Phys. Pol. A, vol. 146, no. 5, p. 721, Dec. 2024, doi: 10.12693/APhysPolA.146.721.
Issue
Vol. 146 No. 5 (2024): Proceedings of the 5th Jagiellonian Symposium on Advances in Particle Physics and Medicine, pp. 661-736
Section
Special segment
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This work is licensed under a Creative Commons Attribution 4.0 International License.

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