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奥村 拓馬*; 橋本 直; 他40名*
Physical Review Letters, 130(17), p.173001_1 - 173001_7, 2023/04
被引用回数:1 パーセンタイル:83.24(Physics, Multidisciplinary)To test bound-state quantum electrodynamics (BSQED) in the strong-field regime, we have performed high-precision X-ray spectroscopy of the 5-4 and 5-4 transitions (BSQED contribution of 2.4 eV and 5.2 eV, respectively) of muonic neon atoms in the low-pressure gas phase without bound electrons. Muonic atoms have been recently proposed as an alternative to few-electron high-Z ions for BSQED tests by focusing on circular Rydberg states where nuclear contributions are negligibly small. We determined the - transition energy to be 6297.08 0.04 (stat.) 0.13 (syst.) eV using superconducting transition-edge sensor microcalorimeters (5.2-5.5 eV FWHM resolution), which agrees well with the most advanced BSQED theoretical prediction of 6297.26 eV.
後神 利志*; 藤田 真奈美; 長谷川 勝一; 細見 健二; 今井 憲一*; 市川 裕大; 七村 拓野; 成木 恵; 佐甲 博之; 佐藤 進; et al.
Journal of Physics; Conference Series, 1643, p.012133_1 - 012133_6, 2020/12
被引用回数:2 パーセンタイル:84.57(Astronomy & Astrophysics)We performed hypernuclear spectroscopy with the reaction at J-PARC to investigate the interaction (J-PARC E05). A new experiment (J-PARC E70) in which a better energy resolution could be achieved is now being prepared. In this article, an analysis status of J-PARC E05 and a preparation status of J-PARC E70 are described.
Harding, R. D.*; Andreyev, A. N.; Barzakh, A. E.*; Atanasov, D.*; Cubiss, J. G.*; Van Duppen, P.*; 他40名*
Physical Review C, 102(2), p.024312_1 - 024312_16, 2020/08
被引用回数:10 パーセンタイル:73.66(Physics, Nuclear)A detailed nuclear spectroscopy study of Au was performed. An -decay branching ratio of % and a half-life of s have been derived. The first measurement of the hyper fine structure for atomic transitions has been also performed, from which the magnetic dipole moment has been extracted. A spin assignment of is proposed for the ground state of Au, with a [532][512] configuration.
中川 真菜美*; 江川 弘行; 長谷川 勝一; 早川 修平; 細見 健二; Hwang, S.; 市川 裕大; 今井 憲一; 佐甲 博之; 佐藤 進; et al.
JPS Conference Proceedings (Internet), 17, p.012009_1 - 012009_4, 2017/07
One of the main items of the J-PARC E13 experiment is the search for excited states of the He hypernucleus via the He reaction at 1.5 GeV/c. The missing-mass spectrum of the He reaction was obtained in an angular range from 0 to 20 degrees. We show the count-base spectrum of the missing-mass in the angular range from 2 to 14 degrees. The ground state of He and He were clearly observed in the missing-mass spectrum. We also show three missing-mass spectra divided by the reaction angle.
三輪 浩司*; 長谷川 勝一; 早川 修平; 細見 健二; 今井 憲一; 近藤 恭弘; 成木 恵; 佐甲 博之; 佐藤 進; 杉村 仁志; et al.
JPS Conference Proceedings (Internet), 17, p.041002_1 - 041002_6, 2017/07
In order to test theoretical frameworks of the Baryon-Baryon () interactions and to confirm the "Pauli effect between quarks" for the first time, we have proposed an experiment (J-PARC E40) to measure low-energy hyperon-proton scattering cross sections of the , elastic scatterings and the inelastic scattering in the momentum range of in the laboratory system. Experimentally, we detect two successive reactions of the production and the scattering () in the same liquid hydrogen target. The former is measured with two magnetic spectrometers, and the latter with a scattered proton detector (CATCH). By using a high intensity beam, we estimate that more than 10000 scattering events can be identified. In this experiment, we aim to provide good quality scattering data to test the theoretical models of the interaction.