Y. Ichikawa

activity

20122026

most citedObservation of Spin-Dependent Charge Symmetry Breaking in

Λ N

Interaction: Gamma-Ray Spectroscopy of

_{Λ}^{4}

115 citations · 537 across the 18 of their papers we have counts for

collaborators

19 papers

nucl-ex2026

Development of a Neural Network-Based Background Suppression Technique for $Σ N$ Cusp Spectroscopy at J-PARC

K. Amemiya, Y. Ichikawa, S. H. Hayakawa +8

A clear spectral enhancement, known as the `` $Σ N$ cusp'', has been observed near the $Σ N$ threshold in the $d (K^{-}, π^{-})$ reaction. To understand the dynamical origin of this enhanc…

nucl-ex2026

First Measurement of the $K^{-}$ Escape Cross Section in the $^{12} C (K^{-}, p)$ Reaction

Fumiya Oura, Yudai Ichikawa, Junko Yamagata-Sekihara +32

We investigated the $K ˉ$ -nucleus interaction through the simultaneous measurement of the inclusive $^{12} C (K^{-}, p)$ and exclusive $K^{-}$ -escape $^{12}{\rm C}(K^-, p K^-_{…

nucl-ex2025

Cross section Measurements for $^{12}$ C $(K^{-}, K^{+} Ξ^{-})$ and $^{12}$ C $(K^{-}, K^{+} ΛΛ)$ Reactions at 1.8 GeV $/ c$

Woo Seung Jung, Yudai Ichikawa, Byung Min Kang +30

We present a measurement of the production of $Ξ^{-}$ and $ΛΛ$ in the $^{12}$ C $(K^{-}, K^{+})$ reaction at an incident beam momentum of 1.8 GeV/ $c$ , based on high-statistics dat…

nucl-ex2022

Measurement of differential cross sections for $Σ^{+} p$ elastic scattering in the momentum range 0.44-0.80 GeV/c

PARC E40 Collaboration, T. Nanamura, K. Miwa +69

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 \times…

nucl-ex2021★ 2 cited

Precise measurement of differential cross sections of the Σ-p --> Λ n reaction in momentum range 470-650 MeV/c

PARC E40 Collaboration, K. Miwa, J. K. Ahn +69

The differential cross sections of the Σ-p --> Λ n reaction were measured accurately for the Σ- momentum (p_{Σ}) ranging from 470 to 650 MeV/c at the J-PARC Hadron Experimental Fac…

nucl-ex2021★ 22 cited

Extension of the J-PARC Hadron Experimental Facility: Third White Paper

Kazuya Aoki, Hiroyuki Fujioka, Toshiyuki Gogami +40

The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through the experiments with intense particle beam…

nucl-ex2021★ 1 cited

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

PARC E40 Collaboration, K. Miwa, J. K. Ahn +69

A high statistics $Σ p$ scattering experiment has been performed at the J-PARC Hadron Experimental Facility. Data for momentum-tagged $Σ^{-}$ running in a liquid hydrogen target wer…

nucl-ex2021★ 51 cited

First observation of a nuclear $s$ -state of $Ξ$ hypernucleus, $_{Ξ}^{15} C$

M. Yoshimoto, J. K. Ahn, B. Bassalleck +46

Bound-systems of $Ξ^{-}$ -- $_{14} N$ are studied via $Ξ^{-}$ capture at rest followed by emission of a twin single- $Λ$ hypernucleus in the emulsion detectors. Two events forming…

nucl-ex2020★ 72 cited

Observation of Coulomb-assisted nuclear bound state of $Ξ^{-}$ - $^{14}$ N system

S. H. Hayakawa, K. Agari, J. K. Ahn +95

In an emulsion-counter hybrid experiment performed at J-PARC, a $Ξ^{-}$ absorption event was observed which decayed into twin single- $Λ$ hypernuclei. Kinematic calculations enabled a…

nucl-ex2018★ 55 cited

Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment

H. Ekawa, K. Agari, J. K. Ahn +100

A double- $Λ$ hypernucleus, $_{ΛΛ} Be$ , was observed by the J-PARC E07 collaboration in nuclear emulsions tagged by the $(K^{-}, K^{+})$ reaction. This event was interprete…

nucl-ex2017★ 19 cited

First Determination of Level Structure of an $s d$ -Shell Hypernucleus, $_{Λ}^{19} F$

S. B. Yang, J. K. Ahn, Y. Akazawa +45

We report on the first observation of $γ$ rays emitted from an $s d$ -shell hypernucleus, $_{Λ}^{19} F$ . The energy spacing between the ground state doublet, $1/ 2^{+}$ and $3/ 2^{+}$ …

nucl-ex2017★ 18 cited

Missing-mass spectroscopy with the $^{6}$ Li( $π^{-}, K^{+}$ )X reaction to search for $_{Λ}^{6}$ H

R. Honda, M. Agnello, J. K. Ahn +63

We searched for the bound state of the neutron-rich $Λ$ -hypernucleus $_{Λ}^{6}$ H, using the $^{6}$ Li( $π^{-}, K^{+}$ )X double charge-exchange reaction at a $π^{-}$ beam momentum o…

nucl-ex2016★ 2 cited

Search for Pentaquark Theta+ in Hadronic Reaction at J-PARC

M. Naruki

A variety of nuclear and hadron physics experiments are being performed using meson beams at the J-PARC Hadron Facility. As the first experiment at the facility, the pentaquark The…

nucl-ex2015★ 115 cited

Observation of Spin-Dependent Charge Symmetry Breaking in $Λ N$ Interaction: Gamma-Ray Spectroscopy of $_{Λ}^{4}$ He

T. O. Yamamoto, M. Agnello, Y. Akazawa +51

The energy spacing between the ground-state spin doublet of $_{Λ}^{4}$ He(1 $^{+}$ ,0 $^{+}$ ) was determined to be $1406 \pm 2 \pm 2$ keV, by measuring $γ$ rays for the $1^{+} \to 0^{+}$ transitio…

nucl-ex2014★ 71 cited

Observation of the " $K^{-} pp$ "-like structure in the $d (π^{+}, K^{+})$ reaction at 1.69 GeV/ $c$

Yudai Ichikawa, Tomofumi Nagae, Hiroyuki Fujioka +41

We have observed a " $K^{-} pp$ "-like structure in the $d (π^{+}, K^{+})$ reaction at 1.69 GeV/ $c$ . In this reaction $Λ (1405)$ hyperon resonance is expected to be produced as a doorway to fo…

nucl-ex2014★ 1 cited

Beam energy dependence of charged pion ratio in $^{28}$ Si + In reactions

M. Sako, T. Murakami, Y. Nakai +10

The double differential cross sections for $^{na t}$ In( $^{28}$ Si, $π^{\pm}$ ) reactions are measured at 400, 600, and 800 MeV/nucleon. Both $π^{+}$ and $π^{-}$ are found to be emitted is…

nucl-ex2014★ 23 cited

Inclusive spectrum of the $d (π^{+}, K^{+})$ reaction at 1.69 GeV/c

Yudai Ichikawa, Tomofumi Nagae, Hyoungchan Bhang +41

We have measured an inclusive missing-mass spectrum of the $d (π^{+}, K^{+})$ reaction at the pion incident momentum of 1.69 GeV/ $c$ at the laboratory scattering angles between 2$^\circ…

nucl-ex2013★ 46 cited

Search for $_{Λ}^{6}$ H hypernucleus by the $^{6}$ Li $(π^{-}, K^{+})$ reaction at $p_{π^{-}}$ = 1.2 GeV/ $c$

H. Sugimura, M. Agnello, J. K. Ahn +63

We have carried out an experiment to search for a neutron-rich hypernucleus, $_{Λ}^{6}$ H, by the $^{6}$ Li( $π^{-}, K^{+}$ ) reaction at $p_{π^{-}}$ =1.2 GeV/ $c$ . The obtained missing mass spectru…

nucl-ex2012★ 39 cited

Search for the $Θ^{+}$ pentaquark via the $π^{-} p \to K^{-} X$ reaction at 1.92 GeV/ $c$

K. Shirotori, T. N. Takahashi, S. Adachi +65

The $Θ^{+}$ pentaquark baryon was searched for via the $π^{-} p \to K^{-} X$ reaction in a missing-mass resolution of 1.4 MeV/ $c^{2}$ (FWHM) at J-PARC. $π^{-}$ meson beams were incident on the l…

Development of a Neural Network-Based Background Suppression Technique for ΣN Cusp Spectroscopy at J-PARC

First Measurement of the K− Escape Cross Section in the 12C(K−,p) Reaction

Cross section Measurements for 12C(K−,K+Ξ−) and 12C(K−,K+ΛΛ) Reactions at 1.8 GeV/c

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

Precise measurement of differential cross sections of the Σ-p --> Λ n reaction in momentum range 470-650 MeV/c

Extension of the J-PARC Hadron Experimental Facility: Third White Paper

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

First observation of a nuclear s-state of Ξ hypernucleus, Ξ15​C

Observation of Coulomb-assisted nuclear bound state of Ξ−-14N system

Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment

First Determination of Level Structure of an sd-Shell Hypernucleus, Λ19​F

Missing-mass spectroscopy with the 6Li(π−,K+)X reaction to search for Λ6​H