Sung-Wook Choi

Measurement of Λ Polarization in the π ¯ p → K 0 Λ Reaction at p π¯ = 1.33 GeV/ c toward a New Λ p Scattering Experiment

T. Sakao, K. Miwa, J. K. Ahn, Y. Akazawa et autres

Abstract Understanding the spectrum and dynamics of excited nucleon states ($N^{*}$ resonances) remains a central challenge in hadron physics, as these resonances emerge in intermediate states of $\pi N$ and $\gamma N$ interactions. The dynamical coupled-channel models addressing this problem rely critically …

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Measurement of $\Xi^-$ Polarization in the $K^- p → \Xi^- K^+$ + Reaction at 1.8 GeV/c

Byungmin Kang, J. K. Ahn, Wooseung Jung, Y. Ichikawa et autres

The polarization of a $\Xi^-$ baryon produced in the p$(K^-,K^+)\Xi^-$ reaction offers critical insights into the double-strangeness exchange mechanism. Since polarization reflects the spin-flip amplitude of the reaction, it helps us describe the reaction mechanism involving high-spin resonances, which are expected to …

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Quinoliporphyrin as an Aromatic Monoanionic Porphyrinoid and Its Degradation Promoted by Cu2+

Yoon Hee Lee, Sung-Wook Choi, Min‐Sung Ko, Tae-Ho Roh et autres

This study presents the first synthesis and characterization of quinoliporphyrin ( 6 ), a unique aromatic monoanionic macrocycle featuring a quinoline unit within the porphyrinoid core. Previously, quinoline-containing porphyrins had their quinoline units positioned at peripheral locations. This structural feature exhibits exclusive …

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“Spectroscopic study of Kaonic nuclei using inclusive and exclusive $^{12}\text{C}(K^{-}, p)$ reaction at J-PARC”

Fumiya Oura, J.K. Ahn, Sung-Wook Choi, Masaya Fujita et autres

The J-PARC E05 experiment investigated the interaction between $\overline{K}$ and the residual nucleus via an inclusive $^{12}\rm{C}$$(K^{-}, p)$ spectrum, revealing real and imaginary $\overline{K}$ -nucleus optical potential depths of $(-80, -40)\:\rm{MeV}$. Moreover, an event excess near 100 MeV in the $\overline{K}$ binding …

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Performance of the prototype beam drift chamber for LAMPS at RAON with proton and 12C beams

Hyun Kim, Y. Bae, Chan Yeong Heo, J. Seo et autres

Abstract Beam Drift Chamber (BDC) is designed to reconstruct the trajectories of incident rare isotope beams provided by RAON (Rare isotope Accelerator complex for ON-line experiments) into the experimental target of LAMPS (Large Acceptance Multi-Purpose Spectrometer). To conduct the performance test of …

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Effects of Electron-Withdrawing and Electron-Donating Groups on Aromaticity in Cyclic Conjugated Polyenes

Min‐Sung Ko, Tae-Ho Roh, Pradeep P. Desale, Sung-Wook Choi et autres

)] necessitates the chemical shifts of inner and outer protons. This issue was addressed in porphyrinoids by replacing the electron-withdrawing (E.W.) groups at the meso-positions of porphyrins and allyliporphyrins. Electronic effects on aromaticity in porphyrinoids have not been thoroughly examined in the …

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Status of LAMPS at RAON

B. Hong, D. S. Ahn, J. K. Ahn, Jong Woon Bae et autres

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Role of Smart Farm as a Tool for Sustainable Economic Growth of Korean Agriculture: Using Input–Output Analysis

Sung-Wook Choi, Yong Jae Shin

This study focused on smart farms in Korea to confirm that the fourth industrial revolution technology is a tool that can be used for sustainable economic development in agriculture. This study used the input–output table, which included the production-inducing effects of the …

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Measurement of differential cross sections for Σ⁺p elastic scattering in the momentum range 0.44–0.80 GeV/c

T. Nanamura, K. Miwa, J. K. Ahn, Y. Akazawa et autres

We performed a novel Σ⁺+p scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 Σ⁺+p elastic scattering events were identified from 4.9 × 10⁷ tagged Σ⁺+ particles in the Σ⁺+ momentum range 0.44-0.80 GeV/c. The differential cross sections of the Σ⁺+p …

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Recent progress and future prospects of hyperon nucleon scattering experiment

K. Miwa, T. Nanamura, T. Sakao, J. K. Ahn et autres

A new hyperon-proton scattering experiment, dubbed J-PARC E40, was performed to measure differential cross sections of the Σ+p, Σ−p elastic scatterings and the Σ−p → Λn scattering by identifying a lot of Σ particles in the momentum ranging from 0.4 to 0.8 …

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High resolution spectroscopy of the “ΣN cusp” by using the d(K−, π−) reaction

Y. Ichikawa, Jungkeun Ahn, Sung-Wook Choi, Manami Fujita et autres

We present a new proposal, J-PARC E90, to measure a missing-mass spectrum near the ΣN threshold for the d(K−, π−) reactions at 1.4 GeV/c. While many previous experiments support apparent enhancement near the ΣN thresh-old, the dynamical origin of this so-called “ΣN …

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Measurement of the differential cross sections of the Σ−p elastic scattering in momentum range 470 to 850 MeV/c

K. Miwa, J. K. Ahn, Y. Akazawa, T. Aramaki et autres

A high statistics $\mathrm{\ensuremath{\Sigma}}p$ scattering experiment is performed at the J-PARC Hadron Experimental Facility. Momentum-tagged ${\mathrm{\ensuremath{\Sigma}}}^{\ensuremath{-}}\mathrm{s}$ running in a liquid hydrogen target are accumulated by detecting the ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{K}^{+}{\mathrm{\ensuremath{\Sigma}}}^{\ensuremath{-}}$ reaction with a high intensity ${\ensuremath{\pi}}^{\ensuremath{-}}$ beam of 20 M/spill. The differential cross sections …

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