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1. Strangeness physics programs by S-2S at J-PARC

Author

Gogami Toshiyuki, Achenbach Patrick, Ahn Jung Keun, Androić Darko, Aoki Kanae, Asaturyan Arshak, Botta Elena, Bukhari Masroor. H., Camsonne Alexandre, Covrig Silviu. C., Ebata Kengo, Ekawa Hiroyuki, Evtoukhovitch Petr, Feliciello Alessandro, Fujioka Hiroyuki, Fujita Manami, Garibaldi Franco, Harada Takeshi. K., Hasegawa Shoichi, Hasegawa Tomoyuki, Hayakawa Shuhei. H., Hirose Erina, Honda Ryotaro, Hosomi Kenji, Ichikawa Yudai, Imai Kenichi, Ishige Tatsuhiro, Jung Wooseung, Kamada Kento, Kanatsuki Shunsuke, Kato Seigo, Kim Shinhyung. H., Kobori Takumi, Marcello Simonetta, Markowitz Pete, Miwa Koji, Mkrtchyan Arthur, Mkrtchyan Hamlet, Moritsu Manabu, Nagae Tomofumi, Nagao Sho, Nakagawa Manami, Nakamura Satoshi. N., Nanamura Takuya, Naruki Megumi, Negishi Ryosuke, Okuyama Kazuki, Oura Fumiya, Pandey Bishnu, Pochodzalla Josef, Sakaguchi Atsushi, Sakao Tamao, Sako Hiroyuki, Samanta Chhanda, Sato Susumu, Shabestari Mitra. H., Shahinyan Albert, Shirotori Kotaro, Širca Simon, Son C., Sugimura Hitoshi, Takahashi Hitoshi, Takahashi Shuji, Takahashi Tomonori, Takahashi Toshiyuki, Tamura Hirokazu, Tanida Kiyoshi, Tokiyasu Atsushi, Tsamalaidze Zviadi, Uchida Makoto, Ukai Mifuyu, Une Chiaki, Urciuoli Guido. M., and Yamamoto Takeshi. O.

Subjects
Physics, QC1-999
Abstract

In the K1.8 beam-line at Hadron Experimental Facility of J-PARC, a new magnetic spectrometer S-2S is being installed. S-2S was designed to achieve a high momentum resolution of Δp/p = 6 × 10−4 in FWHM. Several strangeness-physics programs which require the high resolution will be realized by S-2S. The present article introduces J-PARC E70 (missing-mass spectroscopy of Ξ12Be) and E94 (missing-mass spectroscopy of Λ7Li, Λ10B, and Λ12C) experiments.

Published
2022
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2. Missing-Mass Measurement of the 12C(K-, K+) Reaction at 1.8 GeV/c with the Superconducting Kaon Spectrometer.

Author

Ichikawa, Yudai, Ahn, Jung Keun, Akazawa, Yuya, Aoki, Kanae, Botta, Elena, Ekawa, Hiroyuki, Evtoukhovitch, Petr, Feliciello, Alessandro, Fujita, Manami, Gogami, Toshiyuki, Hasegawa, Shoichi, Hasegawa, Tomoyuki, Hayakawa, Shuhei, Hayakawa, Tomonori, Honda, Ryotaro, Hosomi, Kenji, Imai, Ken'ichi, Jung, Wooseung, Kanatsuki, Shunsuke, and Kim, Shin Hyung

Subjects
BINDING energy, GAUSSIAN function, SPECTROMETERS, HADRONS
Abstract

We performed a measurement of the inclusive missing-mass spectrum of the |$^{12}$| C |$(K^-, K^+)$| reaction at an incident beam momentum of 1.8 GeV/ c. This measurement was carried out by using the Superconducting Kaon Spectrometer (SKS) and the K1.8 beamline spectrometer at the Hadron Experimental Facility in J-PARC. From the missing-mass of the |$^{12}$| C |$(K^-, K^+)$| reaction, the binding energy of a |$\Xi ^-$| hyperon in a core |$^{11}$| B nucleus, |$B_{\Xi ^-}$|⁠ , can be calculated. Our experimental setup yielded a good energy resolution of 8.2 MeV (full width at half maximum), which allowed us to observe significant enhancements in the proximity of the |$^{12}_{\Xi }$| Be production threshold region. In order to extract information from the missing-mass spectrum, we employed several fitting parameters assumptions. A good agreement with the spectrum shape was obtained by adding two Gaussian functions, with the constant experimental resolution for the |$\Xi$| -hypernuclear states, to the background distribution. The peak positions were obtained to be |$B_{\Xi ^-} = 8.9 \pm 1.4$| (stat.) |$^{+3.8}_{-3.1}$| (syst.) MeV and |$B_{\Xi ^-} = -2.4 \pm 1.3$| (stat.) |$^{+2.8}_{-1.2}$| (syst.) MeV. Another model assumption, one Breit–Wigner function with |$B_{\Xi ^-} = -2.7 \pm 2.2$| (stat.) |$^{+0.5}_{-0.7}$| (syst.) MeV and |$\Gamma = 4.1 \pm 2.1$| (stat.) |$^{+1.2}_{-0.7}$| (syst.) MeV, also yielded a similar |$\chi ^2$| value. [ABSTRACT FROM AUTHOR]

Published
2024
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3. An event excess observed in the deeply bound region of the 12C (K−, p) missing-mass spectrum

Author

Ichikawa, Yudai, primary, Yamagata-Sekihara, Junko, additional, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonori, additional, Hirenzaki, Satoru, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Ken’ichi, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kim, Shin Hyung, additional, Kinbara, Shinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nagae, Tomofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sasaki, Yuki, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi O, additional

Published
2020
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4. Study on the baryon interaction by Ξ hypernuclear spectroscopy with the (K −, K +) reaction

Author

Gogami, Toshiyuki, primary, Kanatsuki, Shunsuke, additional, Nagae, Tomofumi, additional, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujioka, Hiroyuki, additional, Fujita, Manami, additional, Harada, Takeshi, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hirose, Erina, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Kenichi, additional, Ichikawa, Yudai, additional, Jung, Wooseung, additional, Katayama, Kazuki, additional, Kato, Seigo, additional, Kim, Shinhyung, additional, Kinbara, Shinji, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Moritsu, Manabu, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Ohashi, Tsubasa, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Suzuki, Kazuki N, additional, Takahashi, Hitoshi, additional, Takahashi, Tomonori, additional, Takahashi, Toshiyuki, additional, Takenaka, Kohei, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Toyoda, Takafumi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, Umezaki, Eiichi, additional, and Yamamoto, Takeshi O, additional

Published
2020
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6. Study of Y* in Nuclei through C(K−, π+)X Spectrum at 1.8 GeV/c in the J-PARC E05 Experiment

Author

Honda, Ryotaro, primary, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonari, additional, Hosomi, Kenji, additional, Imai, Ken’ichi, additional, Ichikawa, Yudai, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kim, Shinhyung, additional, Kinbara, Sinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nagae, Tonofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sasaki, Yuki, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi O., additional

Published
2019
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7. Observation of a Ξ bound state in the 12C(K−, K+) reaction at 1.8 GeV/c

Author

Nagae, Tomofumi, primary, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonori, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Ichikawa, Yudai, additional, Imai, Ken’ichi, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kim, Shinhyung, additional, Kinbara, Sinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sasaki, Yuki, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi. O., additional

Published
2019
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8. K̄ and nucleus system studied by 12C(K−, p) spectrum

Author

Ichikawa, Yudai, primary, Yamagata-Sekihara, Junko, additional, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Bottta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonori, additional, Hirenzaki, Satoru, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Ken’ichi, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kim, Shinhyung, additional, Kinbara, Sinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nagae, Tomofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sasaki, Yuki, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi. O., additional

Published
2019
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9. An event excess observed in the deeply bound region of the 12C (K−, p) missing-mass spectrum.

Author

Ichikawa, Yudai, Yamagata-Sekihara, Junko, Ahn, Jung Keun, Akazawa, Yuya, Aoki, Kanae, Botta, Elena, Ekawa, Hiroyuki, Evtoukhovitch, Petr, Feliciello, Alessandro, Fujita, Manami, Gogami, Toshiyuki, Hasegawa, Shoichi, Hasegawa, Tomoyuki, Hayakawa, Shuhei, Hayakawa, Tomonori, Hirenzaki, Satoru, Honda, Ryotaro, Hosomi, Kenji, Imai, Ken'ichi, and Jung, Wooseung

Subjects
GREEN'S functions, QUASI-elastic scattering, KAON spectra, HYPERFRAGMENTS, FERMI energy
Abstract

We have measured, for the first time, the inclusive missing-mass spectrum of the |$^{12}$| C |$(K^-, p)$| reaction at an incident kaon momentum of 1.8 GeV/ |$c$| at the J-PARC K1.8 beamline. We observed a prominent quasi-elastic peak (⁠|$K^-p \rightarrow K^-p$|⁠) in this spectrum. In the quasi-elastic peak region, the effect of secondary interaction is apparently observed as a peak shift, and the peak exhibits a tail in the bound region. We compared the spectrum with a theoretical calculation based on the Green's function method by assuming different values of the parameters for the |$\bar{K}$| –nucleus optical potential. We found that the spectrum shape in the binding-energy region |$-300 \, \text{MeV} < B_{K} < 40$|  MeV is best reproduced with the potential depths |$V_0 = -80$|  MeV (real part) and |$W_0 = -40$|  MeV (imaginary part). On the other hand, we observed a significant event excess in the deeply bound region around |$B_{K} \sim 100$|  MeV, where the major decay channel of |$K^- NN \to \pi\Sigma N$| is energetically closed, and the non-mesonic decay modes (⁠|$K^- NN \to \Lambda N$| and |$\Sigma N$|⁠) should mainly contribute. The enhancement is fitted well by a Breit–Wigner function with a kaon-binding energy of 90 MeV and width 100 MeV. A possible interpretation is a deeply bound state of a |$Y^{*}$| -nucleus system. [ABSTRACT FROM AUTHOR]

Published
2020
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10. Spectroscopy of Nuclei with Multi-Strangeness by Using New S-2S Spectrometer at J-PARC

Author

Gogami, Toshiyuki, primary, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Amano, Nobuaki, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujioka, Hiroyuki, additional, Fujita, Manami, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonari, additional, Hirose, Erina, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Kenichi, additional, Ichikawa, Yudai, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kato, Seigo, additional, Kim, Shinhyung, additional, Kinbara, Shinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Moritsu, Manabu, additional, Nagae, Tomofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sasaki, Yuki, additional, Sato, Susumu, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Hitoshi, additional, Takahashi, Toshiyuki, additional, Takenaka, Kohei, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi O, additional

Published
2017
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11. Study of the \(\bar{K}\)-Nucleus Interaction by Using the 12C(K−, p) Reaction at J-PARC

Author

Ichikawa, Yudai, primary, Ahn, Jung Keun, additional, Akazawa, Yuya, additional, Aoki, Kanae, additional, Botta, Elena, additional, Ekawa, Hiroyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Fujita, Manami, additional, Gogami, Toshiyuki, additional, Hasegawa, Shoichi, additional, Hasegawa, Tomoyuki, additional, Hayakawa, Shuhei, additional, Hayakawa, Tomonori, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Imai, Ken’ichi, additional, Jung, Wooseung, additional, Kanatsuki, Shunsuke, additional, Kim, Shinhyung, additional, Kinbara, Shinji, additional, Kobayashi, Kazuya, additional, Lee, Jaeyong, additional, Marcello, Simonetta, additional, Miwa, Koji, additional, Moon, Taejin, additional, Nagae, Tomofumi, additional, Nakada, Yoshiyuki, additional, Nakagawa, Manami, additional, Nanamura, Takuya, additional, Naruki, Megumi, additional, Sakaguchi, Atsushi, additional, Sako, Hiroyuki, additional, Sato, Susumu, additional, Sasaki, Yuki, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Takahashi, Toshiyuki, additional, Tamura, Hirokazu, additional, Tanida, Kiyoshi, additional, Tsamalaidze, Zviadi, additional, Ukai, Mifuyu, additional, and Yamamoto, Takeshi. O., additional

Published
2017
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