The Experts below are selected from a list of 23223 Experts worldwide ranked by ideXlab platform
N Kawamura - One of the best experts on this subject based on the ideXlab platform.
-
development of microwave cavities for measurement of muonium Hyperfine Structure at j parc
Progress of Theoretical and Experimental Physics, 2021Co-Authors: S. Kanda, N Kawamura, K S Tanaka, Motoki Iwasaki, O Kamigaito, Y Matsuda, T MibeAbstract:The MuSEUM collaboration is planning measurements of the ground-state Hyperfine Structure (HFS) of muonium at the Japan Proton Accelerator Research Complex (J-PARC), Materials and Life Science Experimental Facility. The high-intensity beam that will soon be available at H-line allows for more precise measurements by one order of magnitude. We plan to conduct two staged measurements. First, we will measure the Mu-HFS in a near-zero magnetic field, and thereafter we will measure it in a strong magnetic field. We have developed two microwave cavities for this purpose. Furthermore, we evaluated systematic uncertainties from such a fluctuation of microwave fields and confirm the requirement of the microwave system, we use a microwave field distribution calculated from the finite element method.
-
new precise spectroscopy of the Hyperfine Structure in muonium with a high intensity pulsed muon beam
Physics Letters B, 2021Co-Authors: S. Kanda, Y Fukao, Yutaka Ikedo, Kunio Ishida, M Iwasaki, D Kawall, N KawamuraAbstract:Abstract A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It is a near-ideal two-body system for a precision test of bound-state theory and fundamental symmetries. The MuSEUM collaboration performed a new precision measurement of the muonium ground-state Hyperfine Structure at J-PARC using a high-intensity pulsed muon beam and a high-rate capable positron counter. The resonance of Hyperfine transition was successfully observed at a near-zero magnetic field, and the muonium Hyperfine Structure interval of ν HFS = 4.463302 ( 4 ) GHz was obtained with a relative precision of 0.9 ppm. The result was consistent with the previous ones obtained at Los Alamos National Laboratory and the current theoretical calculation. We present a demonstration of the microwave spectroscopy of muonium for future experiments to achieve the highest precision.
Yutaka Ikedo - One of the best experts on this subject based on the ideXlab platform.
-
new precise spectroscopy of the Hyperfine Structure in muonium with a high intensity pulsed muon beam
Physics Letters B, 2021Co-Authors: S. Kanda, Y Fukao, Yutaka Ikedo, Kunio Ishida, M Iwasaki, D Kawall, N KawamuraAbstract:Abstract A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It is a near-ideal two-body system for a precision test of bound-state theory and fundamental symmetries. The MuSEUM collaboration performed a new precision measurement of the muonium ground-state Hyperfine Structure at J-PARC using a high-intensity pulsed muon beam and a high-rate capable positron counter. The resonance of Hyperfine transition was successfully observed at a near-zero magnetic field, and the muonium Hyperfine Structure interval of ν HFS = 4.463302 ( 4 ) GHz was obtained with a relative precision of 0.9 ppm. The result was consistent with the previous ones obtained at Los Alamos National Laboratory and the current theoretical calculation. We present a demonstration of the microwave spectroscopy of muonium for future experiments to achieve the highest precision.
-
new precise measurements of muonium Hyperfine Structure at j parc muse
Epj Web of Conferences, 2019Co-Authors: P Strasser, Y Fukao, Yutaka Ikedo, Hiromi Iinuma, M Abe, M Aoki, S Choi, Y Higashi, T Higuchi, K IshidaAbstract:High precision measurements of the ground state Hyperfine Structure (HFS) of muonium is a stringent tool for testing bound-state quantum electrodynamics (QED) theory, determining fundamental constants of the muon magnetic moment and mass, and searches for new physics. Muonium is the most suitable system to test QED because both theoretical and experimental values can be precisely determined. Previous measurements were performed decades ago at LAMPF with uncertainties mostly dominated by statistical errors. At the J-PARC Muon Science Facility (MUSE), the MuSEUM collaboration is planning complementary measurements of muonium HFS both at zero and high magnetic field. The new high-intensity muon beam that will soon be available at H-Line will provide an opportunity to improve the precision of these measurements by one order of magnitude. An overview of the different aspects of these new muonium HFS measurements, the current status of the preparation for high-field measurements, and the latest results at zero field are presented.
-
new precise measurement of muonium Hyperfine Structure interval at j parc
Hyperfine Interactions, 2017Co-Authors: Yasuhiro Ueno, Y Fukao, Yutaka Ikedo, Kunio Ishida, Hiromi Iinuma, M Aoki, Y Higashi, T Higuchi, Takashi U Ito, M IwasakiAbstract:MuSEUM is an international collaboration aiming at a new precise measurement of the muonium Hyperfine Structure at J-PARC (Japan Proton Accelerator Research Complex). Utilizing its intense pulsed muon beam, we expect a ten-fold improvement for both measurements at high magnetic field and zero magnetic field. We have developed a sophisticated monitoring system, including a beam profile monitor to measure the 3D distribution of muonium atoms to suppress the systematic uncertainty.
Y Fukao - One of the best experts on this subject based on the ideXlab platform.
-
new precise spectroscopy of the Hyperfine Structure in muonium with a high intensity pulsed muon beam
Physics Letters B, 2021Co-Authors: S. Kanda, Y Fukao, Yutaka Ikedo, Kunio Ishida, M Iwasaki, D Kawall, N KawamuraAbstract:Abstract A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It is a near-ideal two-body system for a precision test of bound-state theory and fundamental symmetries. The MuSEUM collaboration performed a new precision measurement of the muonium ground-state Hyperfine Structure at J-PARC using a high-intensity pulsed muon beam and a high-rate capable positron counter. The resonance of Hyperfine transition was successfully observed at a near-zero magnetic field, and the muonium Hyperfine Structure interval of ν HFS = 4.463302 ( 4 ) GHz was obtained with a relative precision of 0.9 ppm. The result was consistent with the previous ones obtained at Los Alamos National Laboratory and the current theoretical calculation. We present a demonstration of the microwave spectroscopy of muonium for future experiments to achieve the highest precision.
-
new precise measurements of muonium Hyperfine Structure at j parc muse
Epj Web of Conferences, 2019Co-Authors: P Strasser, Y Fukao, Yutaka Ikedo, Hiromi Iinuma, M Abe, M Aoki, S Choi, Y Higashi, T Higuchi, K IshidaAbstract:High precision measurements of the ground state Hyperfine Structure (HFS) of muonium is a stringent tool for testing bound-state quantum electrodynamics (QED) theory, determining fundamental constants of the muon magnetic moment and mass, and searches for new physics. Muonium is the most suitable system to test QED because both theoretical and experimental values can be precisely determined. Previous measurements were performed decades ago at LAMPF with uncertainties mostly dominated by statistical errors. At the J-PARC Muon Science Facility (MUSE), the MuSEUM collaboration is planning complementary measurements of muonium HFS both at zero and high magnetic field. The new high-intensity muon beam that will soon be available at H-Line will provide an opportunity to improve the precision of these measurements by one order of magnitude. An overview of the different aspects of these new muonium HFS measurements, the current status of the preparation for high-field measurements, and the latest results at zero field are presented.
-
new precise measurement of muonium Hyperfine Structure interval at j parc
Hyperfine Interactions, 2017Co-Authors: Yasuhiro Ueno, Y Fukao, Yutaka Ikedo, Kunio Ishida, Hiromi Iinuma, M Aoki, Y Higashi, T Higuchi, Takashi U Ito, M IwasakiAbstract:MuSEUM is an international collaboration aiming at a new precise measurement of the muonium Hyperfine Structure at J-PARC (Japan Proton Accelerator Research Complex). Utilizing its intense pulsed muon beam, we expect a ten-fold improvement for both measurements at high magnetic field and zero magnetic field. We have developed a sophisticated monitoring system, including a beam profile monitor to measure the 3D distribution of muonium atoms to suppress the systematic uncertainty.
M Iwasaki - One of the best experts on this subject based on the ideXlab platform.
-
new precise spectroscopy of the Hyperfine Structure in muonium with a high intensity pulsed muon beam
Physics Letters B, 2021Co-Authors: S. Kanda, Y Fukao, Yutaka Ikedo, Kunio Ishida, M Iwasaki, D Kawall, N KawamuraAbstract:Abstract A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It is a near-ideal two-body system for a precision test of bound-state theory and fundamental symmetries. The MuSEUM collaboration performed a new precision measurement of the muonium ground-state Hyperfine Structure at J-PARC using a high-intensity pulsed muon beam and a high-rate capable positron counter. The resonance of Hyperfine transition was successfully observed at a near-zero magnetic field, and the muonium Hyperfine Structure interval of ν HFS = 4.463302 ( 4 ) GHz was obtained with a relative precision of 0.9 ppm. The result was consistent with the previous ones obtained at Los Alamos National Laboratory and the current theoretical calculation. We present a demonstration of the microwave spectroscopy of muonium for future experiments to achieve the highest precision.
-
new precise measurement of muonium Hyperfine Structure interval at j parc
Hyperfine Interactions, 2017Co-Authors: Yasuhiro Ueno, Y Fukao, Yutaka Ikedo, Kunio Ishida, Hiromi Iinuma, M Aoki, Y Higashi, T Higuchi, Takashi U Ito, M IwasakiAbstract:MuSEUM is an international collaboration aiming at a new precise measurement of the muonium Hyperfine Structure at J-PARC (Japan Proton Accelerator Research Complex). Utilizing its intense pulsed muon beam, we expect a ten-fold improvement for both measurements at high magnetic field and zero magnetic field. We have developed a sophisticated monitoring system, including a beam profile monitor to measure the 3D distribution of muonium atoms to suppress the systematic uncertainty.
D Stefanska - One of the best experts on this subject based on the ideXlab platform.
-
Hyperfine Structure studies of the electronic levels of the manganese atom i even parity level system
Journal of Quantitative Spectroscopy & Radiative Transfer, 2020Co-Authors: P Glowacki, D Stefanska, J Ruczkowski, M ElantkowskaAbstract:Abstract The Hyperfine Structure of 15 spectral lines of the manganese atom was investigated with the method of laser induced fluorescence on an atomic beam. Results of these investigations, supplemented by the results obtained in Part I of this work series, yielded the Hyperfine Structure constants A and B for altogether 38 odd-parity levels. For 11 levels the A and B values are reported for the first time, for another 10 levels new constants B were evaluated, and for the remaining 17 levels the accuracy of the hitherto available literature data was improved; thus the available database of the Hyperfine Structure constants for the manganese atom was considerably extended. A semi-empirical fit of the fine and the Hyperfine Structure for the odd-parity level system of the atomic manganese was also performed in the present work; generally a good agreement between the experimental and the calculated values was found.
-
Hyperfine Structure investigations for the odd parity configuration system in atomic holmium
Journal of Quantitative Spectroscopy & Radiative Transfer, 2018Co-Authors: D Stefanska, B FurmannAbstract:Abstract In this work new experimental results of the Hyperfine Structure (hfs) in the holmium atom are reported, concerning the odd-parity level system. Investigations were performed by the method of laser induced fluorescence in a hollow cathode discharge lamp on 97 spectral lines in the visible part of the spectrum. Hyperfine Structure constants: magnetic dipole - A and electric quadrupole - B for 40 levels were determined for the first time; for another 21 levels the hfs constants available in the literature were remeasured. Results for the A constants can be viewed as fully reliable; for B constants further possibilities of improving the accuracy are considered.
-
high precision investigations of the Hyperfine Structure of metastable levels in a chromium atom
Journal of Physics B, 2007Co-Authors: A Jarosz, P Glowacki, D Stefanska, J Ruczkowski, M Elantkowska, B Furmann, A Buczek, A Krzykowski, ł Piątkowski, Ewa StachowskaAbstract:A series of precise measurements of the Hyperfine Structure (hfs) of nine metastable levels in a chromium atom 53Cr has been performed. For eight levels the hfs has been investigated with the method of laser induced fluorescence (LIF) on an atomic beam, and for the lowest-lying metastable level 3d54s 5S2 a still more precise method of laser-rf double resonance on an atomic beam (ABMR-LIRF) has been applied. A semi-empirical analysis of the fine and the Hyperfine Structure of the chromium atom, including many-body interaction effects, has been carried out in order to determine the value of the nuclear electric quadrupole moment, which amounts to Q = −0.22(1) barn.
-
semi empirical predictions of even atomic energy levels and their Hyperfine Structure for the scandium atom
Atomic Data and Nuclear Data Tables, 2007Co-Authors: J Dembczynski, M Elantkowska, J Ruczkowski, D StefanskaAbstract:Abstract We report fine and Hyperfine Structure analysis of the system of even configurations of the Sc atom in a large multi-configuration basis. The complete energy scheme in the energy region up to about 50,000 cm−1 has been established with the predicted values of the Hyperfine Structure constants A. The effects of the configuration interaction in the fine and Hyperfine Structure are discussed.
-
study of the Hyperfine Structure of titanium atom by laser induced fluorescence on an atomic beam
European Physical Journal D, 1997Co-Authors: A Krzykowski, B Furmann, A Jarosz, Ewa Stachowska, A Kajoch, D StefanskaAbstract:Within the framework of systematic Hyperfine Structure (hfs) investigation of titanium atom the hfs splitting of 3d34s3H4,5,6 levels for two stable isotopes 47Ti and 49Ti have been measured by laser induced fluorescence. Experimental hfs constants Aexp and Bexp have been determined. The hfs measurements confirm an existence of a significant spin-dependent interaction effect on hfs Structure of the level 3d3 4s3H4.
