Kimiko Sekiguchi

RIKEN Nishina Center

*This is an algorithmically generated author record based on publicly available information.

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Research Subjects

Nuclear Physics

Research Interests

Kimiko Sekiguchi has a total of 252 co-authors. Here are the top co-authors by number of shared publications:

K. Yako
Center for Nuclear Study, University of Tokyo
16 shared publications
N. Sakamoto
RIKEN Nishina Center, Wako, Japan
12 shared publications
Hideyuki Sakai
RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
11 shared publications
T. Saito
10 shared publications
Tomohiro Uesaka
RIKEN Nishina Center for Accelerator-Based Science , 2-1 Hirosawa, Wako, Saitama 351-0198
10 shared publications
Yukie Maeda
University of Miyazaki
10 shared publications

Latest Publications

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- 8 July 2026
- Published by Springer Nature in The European Physical Journal A
New measurement system for the spin correlation coefficients in deuteron–proton elastic scattering
by Y. Saito, K. Sekiguchi, A. Watanabe, K. Suzuki, H. Sugahara, D. Takahashi, K. Tateishi, S. Otsuka, H. Sakai, N. Sakamoto, et al.
Recent years have seen a growing need for high-precision data on spin observables in nucleon–deuteron ( Nd ) elastic scattering below the pion production threshold. Such data are expected to play a crucial role in advancing the understanding of the three-nucleon force (3 N F) and in establishing its description within the framework of chiral effective field theory ( $$\chi $$ $χ$ EFT). This paper presents a new measurement system developed at the RIKEN RI Beam Factory to address such demand, featuring a solid-state polarized proton target and the KuJyaku detector for deuteron–proton ( d – p ) elastic scattering experiments. In conjunction with the polarized deuteron beams provided by the polarized ion source at RIKEN, the system enables measurement of the spin correlation coefficients—for which data remain scarce—along with the deuteron and proton analyzing powers in d – p elastic scattering. Performances of the newly developed target and detector systems were evaluated under realistic beam conditions through deuteron–polarized proton scattering experiment at 135 MeV/nucleon. The angular distribution of the extracted relative differential cross-section and proton analyzing power exhibit close agreement with existing data, validating the identification of d – p elastic events using the KuJyaku detector. The absolute polarization of the solid-state polarized proton target was determined to be $$0.034 \pm 0.004_\mathrm{stat.} \pm 0.001_\mathrm{sys.}$$ $0.034 \pm 0 . 004_{stat .} \pm 0 . 001_{sys .}$ , with its stability under beam irradiations confirmed throughout the experiment. Discussions are presented on the estimated uncertainties of the spin correlation coefficients to be measured. The results are compared with the latest sensitivity studies on the low-energy constants in the 3 N F sector of $$\chi $$ $χ$ EFT at the fifth order (N $$^4$$ $^{4}$ LO), demonstrating the feasibility of spin-observable measurements using the new experimental apparatus as a crucial step toward establishing the high-precision 3 N F potential.
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- 8 July 2026
- Published by Springer Nature in The European Physical Journal A
Open Access
New measurement system for the spin correlation coefficients in deuteron–proton elastic scattering
by Y. Saito, K. Sekiguchi, A. Watanabe, K. Suzuki, H. Sugahara, D. Takahashi, K. Tateishi, S. Otsuka, H. Sakai, N. Sakamoto, et al.
Recent years have seen a growing need for high-precision data on spin observables in nucleon–deuteron ( Nd ) elastic scattering below the pion production threshold. Such data are expected to play a crucial role in advancing the understanding of the three-nucleon force (3 N F) and in establishing its description within the framework of chiral effective field theory ( $$\chi $$ $χ$ EFT). This paper presents a new measurement system developed at the RIKEN RI Beam Factory to address such demand, featuring a solid-state polarized proton target and the KuJyaku detector for deuteron–proton ( d – p ) elastic scattering experiments. In conjunction with the polarized deuteron beams provided by the polarized ion source at RIKEN, the system enables measurement of the spin correlation coefficients—for which data remain scarce—along with the deuteron and proton analyzing powers in d – p elastic scattering. Performances of the newly developed target and detector systems were evaluated under realistic beam conditions through deuteron–polarized proton scattering experiment at 135 MeV/nucleon. The angular distribution of the extracted relative differential cross-section and proton analyzing power exhibit close agreement with existing data, validating the identification of d – p elastic events using the KuJyaku detector. The absolute polarization of the solid-state polarized proton target was determined to be $$0.034 \pm 0.004_\mathrm{stat.} \pm 0.001_\mathrm{sys.}$$ $0.034 \pm 0 . 004_{stat .} \pm 0 . 001_{sys .}$ , with its stability under beam irradiations confirmed throughout the experiment. Discussions are presented on the estimated uncertainties of the spin correlation coefficients to be measured. The results are compared with the latest sensitivity studies on the low-energy constants in the 3 N F sector of $$\chi $$ $χ$ EFT at the fifth order (N $$^4$$ $^{4}$ LO), demonstrating the feasibility of spin-observable measurements using the new experimental apparatus as a crucial step toward establishing the high-precision 3 N F potential.
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- 3 November 2025
- Published by American Physical Society (APS) in Physical Review C
Analyzing powers for proton- He 3 elastic scattering at intermediate energies
by A. Watanabe, K. Sekiguchi, A. Deltuva, K. Hatanaka, T. Ino, M. Inoue, S. Ishikawa, M. Itoh, K. Kameya, H. Kanda, et al.
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- 3 November 2025
- Published by American Physical Society (APS) in Physical Review C
Analyzing powers for proton- He 3 elastic scattering at intermediate energies
by A. Watanabe, K. Sekiguchi, A. Deltuva, K. Hatanaka, T. Ino, M. Inoue, S. Ishikawa, M. Itoh, K. Kameya, H. Kanda, et al.
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- 3 July 2025
- Published by Taylor & Francis in Nuclear Physics News
The Third Faddeev Medal
by Kimiko Sekiguchi
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- 3 July 2025
- Published by Taylor & Francis in Nuclear Physics News
The Third Faddeev Medal
by Kimiko Sekiguchi
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Cited by 4
- 22 April 2025
- Published by American Physical Society (APS) in Physical Review C
Three-nucleon force effects in polarization transfers from the doubly spin-polarized initial neutron-deuteron state to the outgoing neutron in neutron-deuteron scattering
by H. Witała, J. Golak, R. Skibiński, H. Sakai, K. Sekiguchi
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- 22 April 2025
- Published by American Physical Society (APS) in Physical Review C
Three-nucleon force effects in polarization transfers from the doubly spin-polarized initial neutron-deuteron state to the outgoing neutron in neutron-deuteron scattering
by H. Witała, J. Golak, R. Skibiński, H. Sakai, K. Sekiguchi
Cited by 4
Top Cited Papers
Open Access
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Cited by 29
- 22 January 2025
- Published by Springer Nature in The European Physical Journal A
Three-body forces and Efimov physics in nuclei and atoms
by Shimpei Endo, Evgeny Epelbaum, Pascal Naidon, Yusuke Nishida, Kimiko Sekiguchi, Yoshiro Takahashi
This review article presents historical developments and recent advances in our understanding on the three-body forces and Efimov physics, from an interdisciplinary viewpoint encompassing nuclear physics and cold atoms. Theoretical attempts to elucidate the three-body force with the chiral effective field theory are explained, followed by an overview of experiments aimed at observing signatures of the nuclear three-body force. Some recent experimental and theoretical works in the field of cold atoms devoted to measuring and engineering three-body forces among atoms are also presented. As a phenomenon arising from the three-body effect, Efimov physics in both cold atoms and nuclear systems is reviewed.
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- 22 January 2025
- Published by Springer Nature in The European Physical Journal A
Top Cited Papers
Open Access
Three-body forces and Efimov physics in nuclei and atoms
by Shimpei Endo, Evgeny Epelbaum, Pascal Naidon, Yusuke Nishida, Kimiko Sekiguchi, Yoshiro Takahashi
This review article presents historical developments and recent advances in our understanding on the three-body forces and Efimov physics, from an interdisciplinary viewpoint encompassing nuclear physics and cold atoms. Theoretical attempts to elucidate the three-body force with the chiral effective field theory are explained, followed by an overview of experiments aimed at observing signatures of the nuclear three-body force. Some recent experimental and theoretical works in the field of cold atoms devoted to measuring and engineering three-body forces among atoms are also presented. As a phenomenon arising from the three-body effect, Efimov physics in both cold atoms and nuclear systems is reviewed.
Cited by 29
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Cited by 2
- 15 April 2024
- Published by Springer Nature in Few-Body Systems
Experiments of Few-Nucleon Scattering to Explore Three-Nucleon Forces
by Kimiko Sekiguchi
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- 15 April 2024
- Published by Springer Nature in Few-Body Systems
Experiments of Few-Nucleon Scattering to Explore Three-Nucleon Forces
by Kimiko Sekiguchi
Cited by 2
Open Access
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Cited by 1
- 7 February 2024
- Published by Sissa Medialab Srl
Review of the experimental activity at RIKEN to explore the three-nucleon interactions
by Kimiko Sekiguchi
Three--nucleon scattering offers a good opportunities to study dynamical aspects of three-nucleon forces that are momentum, spin and iso-spin dependent. At RIKEN the experimental programs of the deuteron-proton scattering at 70-300 MeV/nucleon are on going with the aim of exploring three-nucleon forces. In this contribution, representative experimental results of deuteron--proton elastic scattering are presented. The data are compared with state-of-the art theoretical predictions based on realistic bare nuclear potentials.
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- 7 February 2024
- Published by Sissa Medialab Srl
Open Access
Review of the experimental activity at RIKEN to explore the three-nucleon interactions
by Kimiko Sekiguchi
Three--nucleon scattering offers a good opportunities to study dynamical aspects of three-nucleon forces that are momentum, spin and iso-spin dependent. At RIKEN the experimental programs of the deuteron-proton scattering at 70-300 MeV/nucleon are on going with the aim of exploring three-nucleon forces. In this contribution, representative experimental results of deuteron--proton elastic scattering are presented. The data are compared with state-of-the art theoretical predictions based on realistic bare nuclear potentials.
Cited by 1
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Cited by 8
- 21 November 2022
- Published by American Physical Society (APS) in Physical Review C
Spin correlation coefficient for proton- ${}^{3}{He}$ elastic scattering at 100 MeV
by A. Watanabe, S. Nakai, K. Sekiguchi, A. Deltuva, S. Goto, K. Hatanaka, Y. Hirai, T. Ino, D. Inomoto, M. Inoue, et al.
We present the measured spin correlation coefficient $C_{y, y}$ for $p − {}^{3}{He}$ elastic scattering at 100 MeV at the angles $θ_{c . m .} = 46 . 9^{\circ}$ – $149 . 2^{\circ}$ in the center-of-mass system. The $C_{y, y}$ data and the existing cross section data are compared with rigorous four-nucleon scattering calculations based on realistic nucleon-nucleon potentials. Large differences are seen in the regime around the cross section minimum for both observables. The $Δ$ -isobar effects estimated by the $N N + N Δ$ coupled-channels approach are small for the cross section. Meanwhile, in $C_{y, y}$ , the $Δ$ -isobar effects improve the agreement with the data. The analysis of the $p − {}^{3}{He}$ elastic scattering amplitudes implies the necessity of three-nucleon forces ( $3 N Fs$ ) that enhance the vector components in the amplitudes. The obtained results indicate that the spin correlation coefficient $C_{y, y}$ expands the knowledge of the nuclear interactions with the $Δ$ isobar or those including $3 N Fs$ that are masked in nucleon-deuteron elastic scattering.
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- 21 November 2022
- Published by American Physical Society (APS) in Physical Review C
Spin correlation coefficient for proton- ${}^{3}{He}$ elastic scattering at 100 MeV
by A. Watanabe, S. Nakai, K. Sekiguchi, A. Deltuva, S. Goto, K. Hatanaka, Y. Hirai, T. Ino, D. Inomoto, M. Inoue, et al.
We present the measured spin correlation coefficient $C_{y, y}$ for $p − {}^{3}{He}$ elastic scattering at 100 MeV at the angles $θ_{c . m .} = 46 . 9^{\circ}$ – $149 . 2^{\circ}$ in the center-of-mass system. The $C_{y, y}$ data and the existing cross section data are compared with rigorous four-nucleon scattering calculations based on realistic nucleon-nucleon potentials. Large differences are seen in the regime around the cross section minimum for both observables. The $Δ$ -isobar effects estimated by the $N N + N Δ$ coupled-channels approach are small for the cross section. Meanwhile, in $C_{y, y}$ , the $Δ$ -isobar effects improve the agreement with the data. The analysis of the $p − {}^{3}{He}$ elastic scattering amplitudes implies the necessity of three-nucleon forces ( $3 N Fs$ ) that enhance the vector components in the amplitudes. The obtained results indicate that the spin correlation coefficient $C_{y, y}$ expands the knowledge of the nuclear interactions with the $Δ$ isobar or those including $3 N Fs$ that are masked in nucleon-deuteron elastic scattering.
Cited by 8
Open Access
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- 26 September 2022
- Published by arXiv in arXiv
Absolute $\rm ^3$He polarimetry for a double-chambered cell using transmission of thermal neutrons
by A. Watanabe, K. Sekiguchi, T. Ino, M. Inoue, S. Nakai, Y. Otake, A. Taketani, Y. Wakabayashi
We present an absolute $^3$He polarimetry method based on thermal neutron transmission for a double-chambered cell. This method utilizes the fact that a $^3$He nucleus has a large absorption cross section and a spin dependence for thermal neutrons. The cell had a pumping chamber and a target chamber. Polarized $^3$He gas was produced in the pumping chamber by SEOP and then diffused into the target chamber. The $^3$He polarization in the target chamber was determined by comparing the neutron transmissions with the polarized and unpolarized targets. The measurement was performed at the RIKEN Accelerator-Driven Compact Neutron Source. The $^3$He polarization in the target chamber was determined with a statistical error of 1.8% and systematic uncertainty of 0.6%. This method can be used to obtain high-precision data of spin observables in few-nucleon scattering for the investigation of nuclear forces.
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- 26 September 2022
- Published by arXiv in arXiv
Open Access
Absolute $\rm ^3$He polarimetry for a double-chambered cell using transmission of thermal neutrons
by A. Watanabe, K. Sekiguchi, T. Ino, M. Inoue, S. Nakai, Y. Otake, A. Taketani, Y. Wakabayashi
We present an absolute $^3$He polarimetry method based on thermal neutron transmission for a double-chambered cell. This method utilizes the fact that a $^3$He nucleus has a large absorption cross section and a spin dependence for thermal neutrons. The cell had a pumping chamber and a target chamber. Polarized $^3$He gas was produced in the pumping chamber by SEOP and then diffused into the target chamber. The $^3$He polarization in the target chamber was determined by comparing the neutron transmissions with the polarized and unpolarized targets. The measurement was performed at the RIKEN Accelerator-Driven Compact Neutron Source. The $^3$He polarization in the target chamber was determined with a statistical error of 1.8% and systematic uncertainty of 0.6%. This method can be used to obtain high-precision data of spin observables in few-nucleon scattering for the investigation of nuclear forces.
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Cited by 18
- 12 April 2021
- Published by American Physical Society (APS) in Physical Review C
Proton- ${}^{3}{He}$ elastic scattering at intermediate energies
by A. Watanabe, S. Nakai, Y. Wada, K. Sekiguchi, A. Deltuva, T. Akieda, D. Etoh, M. Inoue, Y. Inoue, K. Kawahara, et al.
We present a precise measurement of the cross section, proton and ${}^{3}{He}$ analyzing powers, and spin correlation coefficient $C_{y, y}$ for $p − {}^{3}{He}$ elastic scattering near 65 MeV, and a comparison with rigorous four-nucleon scattering calculations based on realistic nuclear potentials and a model with $Δ$ -isobar excitation. Clear discrepancies are seen in some of the measured observables in the regime around the cross section minimum. Theoretical predictions using scaling relations between the calculated cross section and the ${}^{3}{He}$ binding energy are not successful in reproducing the data. Large sensitivity to the $N N$ potentials and rather small $Δ$ -isobar effects in the calculated cross section are noticed as different features from those in the deuteron-proton elastic scattering. The results obtained above indicate that $p − {}^{3}{He}$ scattering at intermediate energies is an excellent tool to explore nuclear interactions not accessible by three-nucleon scattering.
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- 12 April 2021
- Published by American Physical Society (APS) in Physical Review C
Proton- ${}^{3}{He}$ elastic scattering at intermediate energies
by A. Watanabe, S. Nakai, Y. Wada, K. Sekiguchi, A. Deltuva, T. Akieda, D. Etoh, M. Inoue, Y. Inoue, K. Kawahara, et al.
We present a precise measurement of the cross section, proton and ${}^{3}{He}$ analyzing powers, and spin correlation coefficient $C_{y, y}$ for $p − {}^{3}{He}$ elastic scattering near 65 MeV, and a comparison with rigorous four-nucleon scattering calculations based on realistic nuclear potentials and a model with $Δ$ -isobar excitation. Clear discrepancies are seen in some of the measured observables in the regime around the cross section minimum. Theoretical predictions using scaling relations between the calculated cross section and the ${}^{3}{He}$ binding energy are not successful in reproducing the data. Large sensitivity to the $N N$ potentials and rather small $Δ$ -isobar effects in the calculated cross section are noticed as different features from those in the deuteron-proton elastic scattering. The results obtained above indicate that $p − {}^{3}{He}$ scattering at intermediate energies is an excellent tool to explore nuclear interactions not accessible by three-nucleon scattering.
Cited by 18

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