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1. Experimental study of in-medium spectral change of vector mesons at J-PARC

Author

Kazuya Aoki, Daichi Arimizu, Sakiko Ashikaga, Wen-Chen Chang, Tatsuya Chujo, Kengo Ebata, Hideto En'yo, Shinichi Esumi, Hideki Hamagaki, Ryotaro Honda, Masaya Ichikawa, Shunsuke Kajikawa, Koki Kanno, Yuta Kimura, Akio Kiyomichi, Takehito Kondo, Shono Kyan, Che-Sheng Lin, Chih-Hsun Lin, Yuhei Morino, Hikari Murakami, Tomoki Murakami, Ryotaro Muto, Shunnosuke Nagafusa, Wataru Nakai, Satomi Nakasuga, Megumi Naruki, Toshihiro Nonaka, Hiroyuki Noumi, Shuta Ochiai, Kyoichiro Ozawa, Takao Sakaguchi, Hiroyuki Sako, Fuminori Sakuma, Susumu Sato, Shinya Sawada, Michiko Sekimoto, Kenta Shigaki, Kotaro Shirotori, Hitoshi Sugimura, Tomonori Takahashi, Yudai Takaura, Ryohei Tatsumi, Kosuke Tsukui, Po-Hung Wang, Kanta Yahiro, Kanako Yamaguchi, and Satoshi Yokkaichi

Abstract

Chiral symmetry and its spontaneous breaking is an essential property of the QCD vacuum and is closely related to the generation of hadron mass. J-PARC E16 experiment measures dielectron spectra in p+A collisions at 30~GeV to study the in-medium spectral change of vector mesons that signals the partial restoration of the broken symmetry. The experiment uses the primary proton beam available at the high-momentum beam line of the J-PARC hadron experimental facility.We performed three proton-beam runs intended for beamline and detector commissioning. We are preparing for the next commissioning run in 2023 and the first physics run. We present the experimental setup, some of the expected results, preparation status, and some findings in the commissioning runs.

Published
2023

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

Author

Yudai Ichikawa, Toshiyuki Gogami, C. d. L. Taille, Z. Tsamalaidze, Manami Nakagawa, Mifuyu Ukai, S. H. Kim, S. Ishimoto, J. K. Ahn, Kazuhiro Suzuki, T. Shiozaki, Hitoshi Tamura, L. Raux, Hiroyuki Ekawa, Hitoshi Takahashi, S. Hoshino, S. Nagao, S. Callier, T. Nanamura, K. Miwa, Takeshi Koike, Y. Nakada, T. Harada, Masaharu Ieiri, T. Aramaki, M. Ikeda, H. Kawai, K. Tanida, M. Ichikawa, B. M. Kang, Kotaro Shirotori, Shoichi Hasegawa, R. Nagatomi, Kenichi Imai, Makoto Tabata, Masaaki Tanaka, S. Wada, Ryotaro Honda, Hiroyuki Sako, S. W. Choi, H. Umetsu, K. Matsuda, Petr Evtoukhovitch, Yuya Akazawa, Toshiyuki Takahashi, S. Ozawa, T. G. Rogers, H. Kanda, N. Fujioka, H. Kanauchi, S. Y. Suzuki, T. Kitaoka, Takashi Yamamoto, T. Takahashi, Y. Matsumoto, Junya Yoshida, Megumi Naruki, Atsushi Sakaguchi, Manami Fujita, Koji Yoshimura, T. Sakao, S. Ashikaga, S. H. Hayakawa, Kensuke Kobayashi, Yoshikazu Ishikawa, Nobuyuki Chiga, S. Kajikawa, Susumu Sato, I. Nakamura, Kenji Hosomi, and W. S. Jung

Subjects
Nuclear physics, Elastic scattering, Physics, Range (particle radiation), Momentum (technical analysis), 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, Differential (mathematics)
Published
2021

6. Commissioning of the electron identification system for Dilepton measurement in pA collisions at J-PARC

Author

Satomi Nakasuga, Kazuya Aoki, Yoki Aramaki, Daichi Arimizu, Sakiko Ashikaga, Kengo Ebata, Ryotaro Honda, Masaya Ichikawa, Shunsuke Kajikawa, Koki Kanno, Yuta Kimura, Takehito Kondo, Shono Kyan, Yuhei Morino, Hikari Murakami, Tomoki Murakami, Wataru Nakai, Megumi Naruki, Toshihiro Nonaka, Hiroyuki Noumi, Naoki Ogata, Kyoichiro Ozawa, Hiroyuki Sako, Susumu Sato, Michiko Sekimoto, Kotaro Shirotori, Tomonori Takahashi, Yudai Takaura, Ryohei Tatsumi, Kosuke Tsukui, Kanta Yahiro, and Satoshi Yokkaichi

Subjects
Nuclear and High Energy Physics, Instrumentation
Published
2022

7. Trigger Merging Module for the J-PARC E16 Experiment

Author

M. Ichikawa, Megumi Naruki, H. Sendai, K. N. Suzuki, Kanae Aoki, Masahiro Ikeno, Y. Igarashi, T. Takahashi, S. Yokkaichi, D. Kawama, Manobu Tanaka, T. Uchida, Kyoichiro Ozawa, S. Ashikaga, Eitaro Hamada, and Ryotaro Honda

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Meson, 010308 nuclear & particles physics, business.industry, Computer science, Serial communication, Detector, FOS: Physical sciences, Linearity, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Multiplexer, Nuclear Energy and Engineering, 0103 physical sciences, Invariant mass, J-PARC, Electrical and Electronic Engineering, Transceiver, business, Computer hardware
Abstract

An experiment to measure an invariant mass of {\phi} mesons in nuclear medium is planned as the J-PARC E16 experiment. A trigger merging module (TRG-MRG) has been developed to detect leading-edges from 256 channels of discriminator-output signals and transmit those serialized hit data to trigger decision module with four optical links. The result of the test shows enough performance of the TRG-MRG as 1 ns TDC and data multiplexer with four 6.25 Gbps transceivers., Comment: 6 pages, 17 figures, conference record for the 21st IEEE Real Time Conference

Published
2019

8. J-PARC E07: Systematic Study of Double Strangeness System with Hybrid Emulsion Method

Author

Megumi Naruki, R. Kiuchi, Kazuya Watanabe, S. H. Hwang, A. Koshikawa, Y. Sasaki, J. W. Lee, K. Ito, A. Iskendir, Yuki Sato, A. N. L. Nyaw, T. Nanamura, T. Takeda, Shoichi Hasegawa, S. Y. Matsumoto, Junya Yoshida, Yuki Fujikawa, M. Ichikawa, Masahiro Yoshimoto, Manabu Moritsu, Takayoshi Kawai, Hiroki Ito, K. Miwa, Hitoshi Takahashi, Y. Ogura, Hiroyuki Ekawa, C. S. Yoon, K. Imai, K. Inaba, D. H. Zhang, H. Kanauchi, W. S. Jung, Yoshiro Takahashi, Hitoshi Sugimura, Kazuma Nakazawa, T. Hashimoto, Manami Fujita, J. Y. Sohn, Jihwa Lee, Shunsuke Kanatsuki, K. Tanida, H. Sako, T. L. Ma, T. Hayakawa, A. T. Moe, M. Hirose, S. Kinbara, D. Nakashima, M. H. Kim, K. Oue, Y. Nakada, T. J. Moon, M. Minakawa, Myint Kyaw Soe, T. Takahashi, K. Agari, E. Umezaki, Toyoki Watabe, Seongbae Yang, S. Ashikaga, Y. C. Han, Yoshikazu Ishikawa, Mifuyu Ukai, M. Ohashi, Masaharu Ieiri, Kazuhiro Suzuki, Aye Moh Moh Theint, Kensuke Kobayashi, M. M. Soe, K. Hosomi, Manami Nakagawa, K. Hicks, S. Hoshino, Kotaro Shirotori, Yuya Akazawa, S. Y. Ryu, S. H. Kim, E. Hayata, B. Bassalleck, A. Kasagi, Z. Zhang, J. K. Ahn, J. Pochodzalla, Khin Than Tint, Shuhei Hayakawa, T. O. Yamamoto, Takeshi Koike, Y. Toyama, S. Sato, S. Ozawa, N. Fujioka, Ryotaro Honda, Yoko Endo, Y. Ichikawa, T. Akaishi, K. Hoshino, Erina Hirose, S. Bleser, Y. Nagase, Hitoshi Tamura, F. Schupp, Hidetaka Kobayashi, and R. Goto

Subjects
Nuclear physics, Physics, Emulsion, J-PARC, Strangeness
Published
2021

10. J-PARC hadron experimental facility extension project *

Author

Fuminori Sakuma, Kazuya Aoki, Hiroyuki Fujioka, Toshiyuki Gogami, Yoshimasa Hidaka, Emiko Hiyama, Ryotaro Honda, Atsushi Hosaka, Yudai Ichikawa, Masaharu Ieiri, Masahiro Isaka, Noriyoshi Ishii, Takatsugu Ishikawa, Yusuke Komatsu, Takeshi Komatsubara, GeiYoub Lim, Koji Miwa, Yuhei Morino, Tomofumi Nagae, Sho Nagao, Satoshi N. Nakamura, Hajime Nanjo, Megumi Naruki, Hidekatsu Nemura, Tadashi Nomura, Hiroyuki Noumi, Hiroaki Ohnishi, Kyoichiro Ozawa, Shinya Sawada, Takayasu Sekihara, Sang-In Shim, Koji Shiomi, Kotaro Shirotori, Yasuhisa Tajima, Hitoshi Takahashi, Toshiyuki Takahashi, Sachiko Takeuchi, Makoto Takizawa, Hirokazu Tamura, Kiyoshi Tanida, Mifuyu Ukai, Takeshi O. Yamamoto, and Yasuo Yamamoto

Abstract

The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through experiments with intense particle beams. In the past decade, many results from particle and nuclear physics experiments have been obtained at the present facility. To expand the physics programs to as yet unexplored regions, the extension project of the Hadron Experimental Facility has been extensively discussed. This contribution presents the physics of the extension of the Hadron Experimental Facility to resolve issues related to strangeness nuclear physics, hadron physics, and flavor physics.

Published
2022

11. Results of analysis of Σ+p scattering events in J-PARC E40 experiment: differential cross sections and phase shifts of 3S1 and 1P1 states

Author

Takuya Nanamura, Koji Miwa, Shuhei H. Hayakawa, Ryotaro Honda, Yoshiyuki Nakada, Toshiyuki Takahashi, Mifuyu Ukai, and Takeshi O. Yamamoto

Abstract

We performed a novel Σ+p scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 Σ+p scattering events were identified by a kinematical consistency check for the recoil proton. The differential cross sections of the Σ+p elastic scattering were derived with better precision than in previous experiments. By exploiting high-quality differential cross section data and the simple representation of Σ+p interaction in the SU(3) flavor symmetry, we performed a phase-shift analysis on hyperon-nucleon scattering data for the first time. The absolute value of the phase shift of the 3S1 channel, where a large repulsive force was predicted due to the Pauli exclusive effect between quarks, was evaluated. These results indicate that the interaction of the 3S1 channel in the Σ+p channel is moderately repulsive, as the Nijmegen extended-soft-core models predicted.

Published
2022

12. Λ polarization measurement of the π−p → K0Λ reaction in J-PARC E40 experiment

Author

Tamao Sakao, Ryotaro Honda, Koji Miwa, Yoshiyuki Nakada, Takuya Nanamura, Toshiyuki Takahashi, Mifuyu Ukai, and Takeshi Yamamoto

Abstract

We performed the J-PARC E40 experiment to measure the Σp scattering cross sections from 2018 to 2020. Together with the π−p → K+Σ− data, the π−p → K0Λ data were accumulated as a byproduct. The analysis confirmed that Λ could be identified with an S/N ratio of ∼ 2.67. The polarization of Λ(PΛ) was preliminarily derived as 1.009 ± 0.049 for the K0 angular range of 0.7 < cos θK0, CM < 0.8. It is more accurate than the past data [1]. The high polarization enables us to measure not only the differential cross section but also spin observables of the Λp scattering in the future J-PARC experiment.

Published
2022

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

Author

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

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

14. The Ξ− Atom X-ray Spectroscopy at J-PARC

Author

H. Kanauchi, Manami Fujita, Yuji Ishikawa, Ryotaro Honda, Mifuyu Ukai, Kenji Hosomi, Hirokazu Tamura, Takeshi O. Yamamoto, and Takeshi Koike

Subjects
Physics, Crystallography, X-ray spectroscopy, Atom (order theory), J-PARC
Published
2019

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

Author

Kazuya Kobayashi, Elena Botta, Shoichi Hasegawa, Kiyoshi Tanida, Manami Fujita, Tonofumi Nagae, Y. Nakada, S. Kinbara, Toshiyuki Gogami, Atsushi Sakaguchi, Shin Hyung Kim, Mifuyu Ukai, Susumu Sato, Petr Evtoukhovitch, Toshiyuki Takahashi, S. Marcello, Megumi Naruki, Koji Miwa, Shunsuke Kanatsuki, Y. Sasaki, Tomonari Hayakawa, Kenji Hosomi, Takeshi O. Yamamoto, W. S. Jung, S. H. Hayakawa, Kenichi Imai, Jung Keun Ahn, Hirokazu Tamura, Jae-Yong Lee, Kanae Aoki, Kotaro Shirotori, Hiroyuki Sako, Yuya Akazawa, T. Nanamura, Alessandro Feliciello, T. J. Moon, Ryotaro Honda, Hitoshi Sugimura, Hiroyuki Ekawa, Manami Nakagawa, Yudai Ichikawa, and Z. Tsamalaidze

Subjects
Nuclear physics, Physics, Baryon, medicine.anatomical_structure, Spectrum (functional analysis), medicine, J-PARC, Nucleus, Spectral line, Interpretation (model theory)
Abstract

We measured the (K^−, π^+) reaction spectra at 1.8 GeV/c for the graphite and the polyethylene targets in the J-PARC E05 pilot experiment. By comparing the spectra for these two targets, it was found that Σ^*−(1385) in the ^11B nucleus is quite broadened. Furthermore, we also compared broadness of Σ^*−(1385) with K^*(892) obtained in the (K^−, p) spectrum. Σ^*−(1385) seems to be much more broadened in nuclei than K^*(892). We gave a possible interpretation, which is related to compositeness of decuplet baryons, for this situation.

Published
2019

16. Measurement of Vector Meson Mass in Nuclear Matter at J-PARC

Author

Michiko Sekimoto, Hitoshi Sugimura, K. N. Suzuki, Ryotaro Muto, Akio Kiyomichi, Takao Sakaguchi, Yuhei Morino, Hiroyuki Sako, Koki Kanno, Hikari Murakami, S. Miyata, H. En'yo, Kazuya Aoki, Yosuke Watanabe, S. Sawada, Fuminori Sakuma, S. Ashikaga, Tatsuya Chujo, Kenta Shigaki, Wataru Nakai, Ryohei Fujii, Ryotaro Honda, S. Yokkaichi, ShinIchi Esumi, Kyoichiro Ozawa, T. Takahashi, Hideki Hamagaki, M. Ichikawa, Hiroyuki Noumi, Susumu Sato, Megumi Naruki, Yusuke Komatsu, and T. Murakami

Subjects
Quantum chromodynamics, Physics, Particle physics, Meson, Nuclear Theory, Hadron, High Energy Physics::Experiment, Elementary particle, Vector meson, Nuclear Experiment, Nuclear matter, Lepton, Boson
Abstract

An experiment at J-PARC, E16 experiment, which aims to measure the spectral modification of vector meson in nuclear matter is planned. The experiment will measure light vector mesons (ρ/ω/ϕ mesons) generated in nuclear target through the 30 GeV p+A reactions. The mass spectra can be reconstructed with e^+e^− pairs originating from their decays. The spectral modification in finite baryon density is studied systematically. The detail of the experimental plan and expected results are presented with a particular focus on first physics run.

Published
2019

17. First γ-Ray Spectroscopy of an sd-Shell Hypernucleus, \({}_{\Lambda \ }^{19}\text{F}\)

Author

Koji Miwa, Hirokazu Tamura, Takeshi Koike, Tomonari Hayakawa, Kenji Hosomi, Kanae Aoki, Susumu Sato, Petr Evtoukhovitch, Takeshi O. Yamamoto, Jae-Yong Lee, Ryotaro Honda, Toshiyuki Takahashi, Shin Hyung Kim, Yuichi Togawa, Seongbae Yang, Mifuyu Ukai, Yudai Ichikawa, Tomofumi Nagae, Taofeng Wang, Z. Tsamalaidze, S. H. Hwang, T. J. Moon, N. Ichige, Hitoshi Sugimura, Kazuya Kobayashi, Hiroyuki Sako, Atsushi Sakaguchi, M. Ikeda, Shunsuke Kanatsuki, Shoichi Hasegawa, Manami Fujita, Kiyoshi Tanida, Nobuyuki Chiga, Kenichi Imai, Shinji Kinbara, Y. Ogura, Y. Sasaki, S. Suto, Kotaro Shirotori, Yuya Akazawa, Jung Keun Ahn, Shuhei Hayakawa, Hiroyuki Ekawa, Shoji Suzuki, Alessandro Feliciello, Manami Nakagawa, Shigeru Ishimoto, and Y. Nakada

Subjects
Physics, Shell (structure), Atomic physics, Lambda, Hypernucleus, Spectroscopy
Published
2019

18. Experimental Study of Di-quark Correlation by Charmed Baryon Spectroscopy at J-PARC High-Momentum Secondary Beam Line

Author

Y. Miyachi, Takatsugu Ishikawa, J. K. Ahn, W. C. Chang, T. Akaishi, Fuminori Sakuma, Kotaro Shirotori, Kazuya Aoki, Takashi Nakano, Ryotaro Honda, S. Ajimura, Koji Miwa, T. Sawada, H. Asano, Yudai Ichikawa, Yorihito Sugaya, Tomonori Takahashi, Yuhei Morino, Kei Nagai, Kyoichiro Ozawa, Yusuke Komatsu, T. Yamaga, Kiyoshi Tanida, Seongbae Yang, Yue Ma, N. Tomida, Hiroyuki Noumi, and Megumi Naruki

Subjects
Baryon, Quark, Nuclear physics, Physics, Beamline, Excited state, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, J-PARC, Spectroscopy, High momentum
Abstract

A di-quark correlation has been proposed to describe the internal structure of hadrons, especially those of exotic ones. Nevertheless it lacks a conclusive experimental evidence. The J-PARC E50 experiment performs charmed baryon spectroscopy at J-PARC high-momentum beam line to investigate the role of di-quark correlations in baryons. The energy levels of the excited sates are measured by a missing-mass technique for the first time, and the production rates and decay branching ratios are also measured.

Published
2019

19. Search for Excited State of \(_{\Sigma }^{4}\text{He}\) Hypernucleus in the J-PARC E13 Experiment

Author

S. Marcello, S. Suto, Manami Nakagawa, Sho Nagao, Manami Fujita, N. Amano, Ryotaro Honda, Hiroyuki Ekawa, Toshiyuki Gogami, Hirokazu Tamura, Shin Hyung Kim, Shoichi Hasegawa, Shinji Kinbara, Hitoshi Sugimura, Y. Ogura, Kiyoshi Tanida, Tomofumi Nagae, Yudai Ichikawa, T. Shiozaki, Y. Sasaki, Alessandro Feliciello, Michihiko Ikeda, Z. Tsamalaidze, Yasutaka Yamamoto, Shunsuke Kanatsuki, Sanghoon Hwang, Susumu Sato, Petr Evtoukhovitch, Takeshi O. Yamamoto, Shoji Suzuki, N. Ichige, M. H. Kim, T. J. Moon, Michelangelo Agnello, Jae-Yong Lee, Kotaro Shirotori, Yuya Akazawa, Takeshi Koike, Shuhei Hayakawa, Kanae Aoki, Elena Botta, Kenichi Imai, Mifuyu Ukai, Y. Nakada, Kosuke Tanabe, Hiroyuki Sako, Shigeru Ishimoto, Seongbae Yang, Nobuyuki Chiga, Atsushi Sakaguchi, Koji Miwa, Tomonari Hayakawa, Kenji Hosomi, and Toshiyuki Takahashi

Subjects
Nuclear physics, Physics, Excited state, Sigma, J-PARC, Hypernucleus
Published
2019

20. Establishment of a modern experimental technique of a \(\Sigma p\) scattering experiment at J-PARC

Author

Y. Matsumoto, H. Umetsu, K. Tanida, H. Kanauchi, Toshiyuki Gogami, C. d. L. Taille, Atsushi Sakaguchi, Mifuyu Ukai, L. Raux, Megumi Naruki, Kazuhiro Suzuki, Makoto Tabata, S. Hoshino, Manami Fujita, Nobuyuki Chiga, Koji Yoshimura, S. Kajikawa, Masaharu Ieiri, M. Ikeda, S. Callier, Satoshi Sato, T. Shiozaki, Ryotaro Honda, H. Kawai, Kotaro Shirotori, T. G. Rogers, T. Aramaki, T. Harada, S. H. Hayakawa, Hiroyuki Ekawa, Takashi Yamamoto, Yuya Akazawa, Hiroyuki Sako, I. Nakamura, T. Nanamura, Junya Yoshida, R. Nagatomi, Yudai Ichikawa, K. Matsuda, Petr Evtoukhovitch, Kenichi Imai, Shoichi Hasegawa, Kenji Hosomi, S. Ozawa, Y. Nakada, N. Fujioka, M. Ichikawa, B. M. Kang, S. Y. Suzuki, Hitoshi Takahashi, Hitoshi Tamura, S. Ishimoto, Masaaki Tanaka, H. Kanda, T. Sakao, T. Takahashi, S. Ashikaga, Yoshikazu Ishikawa, Kensuke Kobayashi, J. K. Ahn, W. S. Jung, S. H. Kim, Manami Nakagawa, Z. Tsamalaidze, K. Miwa, T. N. Takahashi, Takeshi Koike, S. Nagao, S. W. Choi, Organisation de Micro-Électronique Générale Avancée (OMEGA), and École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Scattering cross-section, Physics, Particle physics, Scattering, Sigma-: production, J-PARC Lab, p Sigma: scattering, Sigma, differential cross section, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Production (computer science), J-PARC, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], talk, Analysis method
Abstract

International audience; A part of the experiment was performed in 2018 and 2019 in J-PARC. As a result of analyzing the collected data, the \(\Sigma ^{ - }\) production and the \(\Sigma ^{ - }p\) scattering reaction have been identified. It means that our new measurement and analysis method are successfully working well. Analysis for deriving the differential cross section of the \(\Sigma p\) scattering is on going.

Published
2019

21. Study of \(\Lambda \) Identification Method by the \(\pi ^{ - }p \to K^{0}\Lambda \) Reaction for a \(\Lambda p\) Scattering Experiment at J-PARC

Author

S. Callier, H. Kawai, Kotaro Shirotori, Yudai Ichikawa, Megumi Naruki, Yuya Akazawa, H. Kanauchi, Y. Nakada, M. Ichikawa, B. M. Kang, Manami Fujita, Koji Yoshimura, T. Nanamura, Masaaki Tanaka, T. Harada, H. Umetsu, Hitoshi Tamura, T. Aramaki, Manami Nakagawa, S. Ishimoto, T. Sakao, K. Matsuda, Petr Evtoukhovitch, Y. Matsumoto, S. Ashikaga, Yoshikazu Ishikawa, Takashi Yamamoto, Z. Tsamalaidze, Junya Yoshida, T. G. Rogers, Shoichi Hasegawa, Toshiyuki Gogami, C. d. L. Taille, R. Nagatomi, Kensuke Kobayashi, K. Tanida, Makoto Tabata, L. Raux, Kenichi Imai, Satoshi Sato, Ryotaro Honda, S. Hoshino, S. W. Choi, W. S. Jung, Atsushi Sakaguchi, Mifuyu Ukai, Kazuhiro Suzuki, K. Miwa, Hitoshi Takahashi, Kenji Hosomi, S. H. Hayakawa, I. Nakamura, S. Kajikawa, S. Nagao, H. Kanda, T. Takahashi, Tadayuki Takahashi, S. H. Kim, J. K. Ahn, Hiroyuki Sako, S. Ozawa, N. Fujioka, S. Y. Suzuki, M. Ikeda, Organisation de Micro-Électronique Générale Avancée (OMEGA), and École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
p Lambda: scattering, momentum: missing-energy, Particle physics, Proton, Hypernuclear Physics, Lambda, Momentum, mass spectrum, p: target, +K0+Lambda%22">pi- p --> K0 Lambda, Pi, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Spectroscopy, cluster, Particle Physics, Physics, Scattering, J-PARC Lab, Strangeness, K0: decay, magnetic spectrometer, J-PARC, Mass spectrum, missing-mass, talk
Abstract

International audience; The \(\pi ^{ - }p \to K^{0}\Lambda \) reaction is an important elementary process to produce \(\Lambda \) from a proton target and is a key for a \(\Lambda p\) scattering experiment where the momentum of \(\Lambda \) should be tagged from the missing momentum of the \((\pi ^{ - },K^{0})\) reaction. However, the \((\pi ^{ - },K^{0})\) spectroscopy method has not been established yet due to the difficulty of the K^0 detection. Therefore, we have proposed a new K^0 detection method where \(\pi ^{ + }\) and \(i^{ - }\) from the K^0 decay are measured by a forward magnetic spectrometer and a detector cluster surrounding the target, respectively. The feasibility of the K^0 detection method was confirmed by analyzing the J-PARC E40 data taken with such a detector system. In the analysis, \(\Lambda \)’s were successfully identified in the missing mass spectrum of the \(\pi ^{ - }p \to K^{0}X\) reaction.

Published
2019

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

Author

Y. Sasaki, Tomoyuki Hasegawa, Shoichi Hasegawa, Kazuya Kobayashi, Kiyoshi Tanida, Satoru Hirenzaki, Shin Hyung Kim, W. S. Jung, J. Yamagata-Sekihara, Megumi Naruki, Y. Nakada, Alessandro Feliciello, Kotaro Shirotori, Jae-Yong Lee, T. Nanamura, Hiroyuki Ekawa, Koji Miwa, Elena Bottta, S. Kinbara, T. J. Moon, Kenji Hosomi, Hitoshi Sugimura, Yuya Akazawa, Susumu Sato, Petr Evtoukhovitch, Takeshi O. Yamamoto, Manami Fujita, Toshiyuki Takahashi, T. Hayakawa, Toshiyuki Gogami, Jung Keun Ahn, Atsushi Sakaguchi, Kanae Aoki, Shuhei Hayakawa, Manami Nakagawa, Ryotaro Honda, Yudai Ichikawa, S. Marcello, Z. Tsamalaidze, Hiroyuki Sako, Hirokazu Tamura, Shunsuke Kanatsuki, Kenichi Imai, Tomofumi Nagae, and Mifuyu Ukai

Subjects
Physics, Momentum, medicine.anatomical_structure, Imaginary part, Nuclear Theory, Binding energy, Spectrum (functional analysis), medicine, Atomic physics, Nuclear Experiment, Optical potential, Nucleus
Abstract

We have measured an inclusive missing-mass spectrum of the 12 C(K−, p) reaction over wide energy region at the kaon incident momentum of 1.8 GeV/c at J-PARC K1.8 beam line. This measurement was carried out as a by-product of a pilot run of J-PARC E05 experiment, which searched for the Ξ-hypernuclei via 12C(K−, K+) reaction. We have compared the observed missing-mass spectrum with a DWIA calculation to study the K-nucleus interaction. In this comparison, we have changed the depth of both real and imaginary parts of the optical potential between the K and nucleus. It is found that the observed spectrum is best reproduced by the calculation of the potential depth of V0 ∼ −80 MeV (real part) and W0 ∼ −40 MeV (imaginary part). On the other hand, we have observed a definitive excess around the deeply bound region BK ≳ 100 MeV. The excess cannot be explained by the any optical potential and quasi-free background reaction. It is well fitted with a Breit-Wigner function with a binding energy of 90 MeV and a width of 100 MeV, which can be interpreted as a deeply bound Λ(1405) nucleus.

Published
2019

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

Author

S. Marcello, Hirokazu Tamura, Jae-Yong Lee, Shin Hyung Kim, W. S. Jung, Manami Fujita, T. Nanamura, Toshiyuki Gogami, Kazuya Kobayashi, Kenichi Imai, Takeshi O. Yamamoto, Kanae Aoki, Y. Nakada, Y. Sasaki, Tomoyuki Hasegawa, Tomofumi Nagae, Elena Botta, Manami Nakagawa, Yudai Ichikawa, Shoichi Hasegawa, Jung Keun Ahn, Koji Miwa, Shunsuke Kanatsuki, Susumu Sato, Z. Tsamalaidze, Petr Evtoukhovitch, Mifuyu Ukai, Kiyoshi Tanida, Ryotaro Honda, Megumi Naruki, T. J. Moon, Kenji Hosomi, Hitoshi Sugimura, Toshiyuki Takahashi, Shuhei Hayakawa, T. Hayakawa, Hiroyuki Sako, Kotaro Shirotori, Alessandro Feliciello, Hiroyuki Ekawa, Yuya Akazawa, S. Kinbara, and Atsushi Sakaguchi

Subjects
Physics, Spectrum (functional analysis), Bound state, Bond energy, Atomic physics, Nuclear Experiment
Abstract

For the full understanding of baryon-baryon interactions in flavor SU(3), the ΞN interaction is the last missing piece of information. So far, we have revealed the ΛN interaction to be attractive (UΛ ≈ 30 MeV), and ΣN interaction to be repulsive in the medium to heavy mass-number region. The ΛΛ bonding energy is weakly attractive. While we have a few experimental observations suggesting the ΞN interaction would be attractive, there still exist large theoretical ambiguities weather it is attractive or not. Experimental determinations on the existence of bound states of Ξ hypernuclei by observing bound-state peaks are strongly awaited. In this report, a new preliminary result on the missing-mass spectrum of a 12C(K−, K+) reaction, which strongly suggests the existence of Ξ-hypernuclear bound states, is presented.For the full understanding of baryon-baryon interactions in flavor SU(3), the ΞN interaction is the last missing piece of information. So far, we have revealed the ΛN interaction to be attractive (UΛ ≈ 30 MeV), and ΣN interaction to be repulsive in the medium to heavy mass-number region. The ΛΛ bonding energy is weakly attractive. While we have a few experimental observations suggesting the ΞN interaction would be attractive, there still exist large theoretical ambiguities weather it is attractive or not. Experimental determinations on the existence of bound states of Ξ hypernuclei by observing bound-state peaks are strongly awaited. In this report, a new preliminary result on the missing-mass spectrum of a 12C(K−, K+) reaction, which strongly suggests the existence of Ξ-hypernuclear bound states, is presented.

Published
2019

24. Gamma-ray spectroscopy of single Λ-hypernuclei at J-PARC: Results and perspective

Author

S. H. Hwang, Y. Nakada, Kanae Aoki, Shunsuke Kanatsuki, Hiroyuki Ekawa, Manami Fujita, Tadayuki Takahashi, Hitoshi Sugimura, Shoichi Hasegawa, Seongbae Yang, K. Tanida, Hiroyuki Sako, Tomofumi Nagae, T. Hayakawa, S. H. Kim, Takeshi O. Yamamoto, Atsushi Sakaguchi, Michelangelo Agnello, Yudai Ichikawa, Y. Sasaki, J. K. Ahn, Hirokazu Tamura, T. F. Wang, Jihwa Lee, S. Kinbara, Nobuyuki Chiga, T. Shiozaki, S. Y. Suzuki, Z. Tsamalaidze, Takeshi Koike, Satoshi Sato, Shuhei Hayakawa, N. Amano, Ryotaro Honda, Mifuyu Ukai, N. Ichige, Manami Nakagawa, M. H. Kim, Kensuke Kobayashi, T. J. Moon, M. Ikeda, Petr Evtoukhovitch, Elena Botta, Y. Togawa, Koji Miwa, Kenji Hosomi, Kotaro Shirotori, Yuya Akazawa, Kenichi Imai, A. Feliciello, S. Ishimoto, Shozo Suto, K. Tanabe, Toshiyuki Gogami, S. Marcello, Sho Nagao, and Y. Ogura

Subjects
Physics, Nuclear physics, Formalism (philosophy of mathematics), Gamma ray, Gamma spectroscopy, J-PARC, Symmetry breaking, Ground state, Spectroscopy, Hypernucleus
Abstract

Experimental results from the J-PARC E13 experiments are summarized. A new experimental set up of E13 has established a platform for the future γ-ray hypernuclear spectroscopy at J-PARC using kaon beams. New γ rays are identified in HeΛ4 and FΛ19. The energy of 1.406 MeV for the HeΛ4(1+→0+) transition confirmed a sizable effect of Charge Symmetry Breaking (CSB) in ΛN interaction in the A=4 hypernuclear system. The identification of four γ rays in FΛ19 is made for the first time in sd shell hypernuclei. Especially, energy spacing of the ground state doublet is found to be 315.5 keV. A good agreement with two theoretical calculations suggests that the theoretical formalism used in p shell hypernuclei is also applicable to heavier hypernuclei. Lastly, an overview of the future J-PARC E63 experiment is given.

Published
2019

25. Status of J-PARC E07: Systematic study of double strangeness nuclei with hybrid emulsion method

Author

Myint Kyaw Soe, Hidetaka Kobayashi, Shunsuke Kanatsuki, Kazuyua Ito, Ryotaro Honda, Masaharu Ieiri, Koji Miwa, M. H. Kim, Shin Hyung Kim, Takeshi Koike, Michiko Sekimoto, Tomonari Hayakawa, Kenji Hosomi, Myeong Jae Lee, E. Umezaki, Yu Takahashi, Khin Than Tint, Mifuyu Ukai, Kazuya Kobayashi, Shuhei Hayakawa, Hiroyuki Ekawa, Yuji Ishikawa, Aye Moh Moh Theint, Zhi Zhang, R. Goto, R. Kiuchi, Hitoshi Sugimura, Koutarou Shiratori, Y. Nakada, Shoichi Hasegawa, Wonji Choi, Tomoya Takeda, Y. Sasaki, May Sweet, Manabu Moritsu, Donhai Zhang, Tianli Ma, Kiyoshi Tanida, T. Hashimoto, Josef Pochodzalla, Shota Matsumoto, Yoshinori Sato, Keizo Agari, Kenichi Imai, K. N. Suzuki, Masahiro Yoshimoto, Yuya Akazawa, Yuki Fujikawa, Tae Jin Moon, M. Ichikawa, Erina Hirose, Masaki Ohashi, H. Kanauchi, Jae-Yong Lee, Hiroki Ito, Toshiyuki Takahashi, Y. C. Han, Jung Keun Ahn, Young Jun Kim, A. N. L. Nyaw, T. Nanamura, Woo Seung Chung, K. Inaba, Kazuma Nakazawa, S. Ashikaga, Michifumi Minakawa, Sung Hyun Kim, Shinji Kinbara, Min Min Soe, S. H. Hwang, Y. Ogura, Manami Nakagawa, S. Ozawa, N. Fujioka, E. Hayata, Hirokazu Tamura, Yoko Endo, Hiroyuki Sako, B. Bassalleck, T. Akaishi, A. Kasagi, Toshihide Kawai, Takeshi Yamamoto, Kenichiro Oue, Seong Bae Yang, Jong Yoon Sohn, Yuichi Nagase, S. Y. Ryu, Yudai Ichikawa, Falk Schupp, K. Hicks, S. Hoshino, Sebastian Bleser, Y. Toyama, Jong Won Lee, Aung Thu Moe, Junya Yoshida, K. Hoshino, Ken Watanabe, Abzal Iskendir, M. Hirose, Megumi Naruki, Hitoshi Takahashi, Manami Fujita, D. Nakashima, Toyoki Watabe, Ami S. Koshikawa, C. S. Yoon, and Susumu Sato

Subjects
Physics, Nuclear physics, Beamline, Hadron, Emulsion, Nuclear emulsion, J-PARC, Strangeness, Hypernucleus, Beam (structure)
Abstract

J-PARC E07 is the most complex emulsion experiment to date investigating double hypernuclei with a hybrid emulsion method. This experiment aims to detect 104 Ξ− stop events, ten times more events than the past experiments. Thus, an unequivocal identification of several new double hypernuclei is expected. The beam exposure has been completed at the K1.8 beam line of the J-PARC hadron facility in June 2017. The photographic development of all emulsion sheets has also been completed in February 2018. The emulsion sheets are presently being analyzed with dedicated optical microscopes. Current statistics is comparable to that of E373 and so far 10 events of 3-vertices topology have been detected. A typical event of double Λ hypernucleus and a twin Λ hypernucleus are introduced. We plan to complete the main part of the emulsion scanning within a year.

Published
2019

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

Author

Takeshi Harada, Tomoyuki Hasegawa, Takeshi O. Yamamoto, Zviadi Tsamalaidze, Shinji Kinbara, Jae-Yong Lee, Shin Hyung Kim, Toshiyuki Gogami, Takafumi Toyoda, Hitoshi Sugimura, E. Umezaki, Hiroyuki Fujioka, Susumu Sato, Petr Evtoukhovitch, Hirokazu Tamura, Koji Miwa, Manabu Moritsu, Hitoshi Takahashi, W. S. Jung, T. Nanamura, Erina Hirose, Jung Keun Ahn, Seigo Kato, Kenichi Imai, K. N. Suzuki, Yudai Ichikawa, Y. Nakada, Megumi Naruki, Kenji Hosomi, Mifuyu Ukai, Kanae Aoki, Kohei Takenaka, Tomofumi Nagae, Tomonori Takahashi, Kotaro Shirotori, Manami Fujita, Atsushi Sakaguchi, S. H. Hayakawa, Manami Nakagawa, Shoichi Hasegawa, Ryotaro Honda, Kiyoshi Tanida, S. Marcello, Hiroyuki Ekawa, Shunsuke Kanatsuki, Tsubasa Ohashi, Yuya Akazawa, Kazuki Katayama, Toshiyuki Takahashi, Elena Botta, Hiroyuki Sako, T. J. Moon, and Alessandro Feliciello

Subjects
Physics, Baryon, Nuclear physics, History, Spectroscopy, Computer Science Applications, Education
Published
2020

27. Study of ∑N interaction from the ∑p scattering experiment at J-PARC

Author

Kenji Hosomi, T. Aramaki, H. Kanauchi, Shoichi Hasegawa, Manami Nakagawa, S. Ozawa, Y. Matsumoto, Hitoshi Takahashi, Makoto Tabata, N. Fujioka, Z. Tsamalaidze, Tadayuki Takahashi, T. Nanamura, S. Y. Suzuki, S. Callier, Satoshi Sato, Ryotaro Honda, R. Nagatomi, T. Shiozaki, T. G. Rogers, L. Raux, H. Kawai, Kotaro Shirotori, Hiroyuki Ekawa, S. H. Kim, Toshiyuki Gogami, C. d. L. Taille, S. Hoshino, S. H. Hayakawa, Yuya Akazawa, Yudai Ichikawa, S. Ishimoto, M. Ichikawa, B. M. Kang, J. K. Ahn, H. Kanda, K. Miwa, Y. Nakada, H. Umetsu, T. Takahashi, T. Harada, Kenichi Imai, W. S. Jung, Masaharu Ieiri, S. W. Choi, M. Ikeda, Takeshi Koike, Hiroyuki Sako, Masaaki Tanaka, T. Sakao, S. Ashikaga, Yoshikazu Ishikawa, Junya Yoshida, Hitoshi Tamura, Mifuyu Ukai, Kazuhiro Suzuki, Takashi Yamamoto, Kensuke Kobayashi, S. Nagao, Manami Fujita, Koji Yoshimura, K. Matsuda, Petr Evtoukhovitch, Megumi Naruki, Nobuyuki Chiga, S. Kajikawa, I. Nakamura, K. Tanida, and Atsushi Sakaguchi

Subjects
Nuclear physics, Physics, History, 010308 nuclear & particles physics, Scattering, 0103 physical sciences, J-PARC, 010306 general physics, 01 natural sciences, Computer Science Applications, Education
Abstract

A high statistics ∑p scattering experiment has been performed at the K1.8 beamline in the J-PARC Hadron Experimental Facility. Data for momentum-tagged ∑− beam running in a liquid hydrogen target were accumulated by detecting the π − p → K + ∑ − reaction with a high intensity π− beam of 20 M/spill. The number of the Σ− beam was about 1.7 × 107 in total. The ∑−ρ elastic scattering and the ∑−p → Λn inelastic scattering events were successfully observed with about 100 times larger statistics than that in past experiments.

Published
2020

28. Operation of Multi-MPPC System for Cylindrical Scintillation Fiber Tracker

Author

Takeshi O. Yamamoto, R. Nagatomi, Shoichi Hasegawa, T. Shiozaki, S. Suzuki, Mifuyu Ukai, J. K. Ahn, I. Nakamura, Shuhei Hayakawa, Manami Nakagawa, T. Nanamura, T. Aramaki, S. Ozawa, T. N. Takahashi, Y. Nakada, Koji Miwa, M. Ichikawa, B. M. Kang, S. Ishimoto, Kenji Hosomi, N. Fujioka, Takeshi Koike, Hirokazu Tamura, Atsushi Sakaguchi, Hitoshi Takahashi, Hiroyuki Ekawa, Hideyuki Kawai, H. Umetsu, H. Kanda, Kensuke Kobayashi, T. Takahashi, M. Ikeda, Nobuyuki Chiga, Makoto Tabata, Kenichi Imai, K. N. Suzuki, Satoshi Sato, S. W. Choi, Masaharu Ieiri, Ryotaro Honda, S. Ashikaga, C. d. L. Taille, Yoshikazu Ishikawa, Hiroyuki Sako, Y. Matsumoto, S. H. Kim, S. Callier, Kotaro Shirotori, Yuya Akazawa, H. Kanauchi, Yudai Ichikawa, Z. Tsamalaidze, L. Raux, S. Hoshino, Manami Fujita, Koji Yoshimura, Megumi Naruki, K. Matsuda, Petr Evtoukhovitch, W. S. Jung, Organisation de Micro-Électronique Générale Avancée (OMEGA), and École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Scintillation, Optics, 010308 nuclear & particles physics, business.industry, 0103 physical sciences, Fiber, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, business, 01 natural sciences
Abstract

International audience; Although more detailed analysis for deriving the cross section of \(\Sigma p\) scattering is necessary to derive the cross section of \(\Sigma p\) scattering, we have confirmed that CFT has enough angular resolution of tracking and energy resolution in order for the identification of the scattering events and particles.

Published
2018

29. A $\Sigma p$ scattering Experiment at J-PARC and the Analysis Status

Author

Hirokazu Tamura, Yudai Ichikawa, H. Kanauchi, H. Kanda, Kumpei Matsuda, Christophe de La Taille, Z. Tsamalaidze, Woo Seung Jung, Seong Bae Yang, Nobuyuki Chiga, Hideyuki Kawai, H. Umetsu, S. Ashikaga, Megumi Naruki, Kenichi Imai, K. N. Suzuki, Koji Miwa, Shuhei Hayakawa, Shin Hyung Kim, Manami Nakagawa, Takeshi Koike, Kazuya Kobayashi, Ryohei Nagatomi, Hiroyuki Ekawa, S. Hoshino, Masaharu Ieiri, Kenji Hosomi, Manami Fujita, Shigeru Ishimoto, Isamu Nakamura, Shoji Suzuki, Jung Keun Ahn, Shoichi Hasegawa, Koji Yoshimura, T. Aramaki, Yuji Ishikawa, Byung Min Kang, Makoto Tabata, Michihiko Ikeda, Hitoshi Takahashi, T. Shiozaki, Atsushi Sakaguchi, Kotaro Shirotori, M. Ichikawa, Kiyoshi Tanida, Sung Wook Choi, Y. Matsumoto, Mifuyu Ukai, Ryotaro Honda, Stephane Callier, Tomonori Takahashi, Y. Nakada, Manobu Tanaka, Toshiyuki Takahashi, Yuya Akazawa, Takeshi O. Yamamoto, T. Nanamura, Ludovic Raux, Susumu Sato, Petr Evtoukhovitch, Hiroyuki Sako, S. Ozawa, N. Fujioka, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Strangeness, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, pi p: elastic scattering, Nuclear physics, mass spectrum, Recoil, strangeness, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], +Lambda+n%22">Sigma- p --> Lambda n, p: recoil, 010306 general physics, $\Sigma$N scattering, Physics, Elastic scattering, 010308 nuclear & particles physics, Scattering, J-PARC Lab, p Sigma: scattering, Sigma, scintillating fiber tracker, J-PARC, Spring (device), differential cross section, Mass spectrum, missing-mass, experimental results
Abstract

International audience; J-PARC E40 aims to measure the differential cross sections of the Σ^±p elastic scatterings and the Σ^−p → Λn conversion. A clear peak of Σ^− was observed in a missing mass spectrum of the π^−p → K^+X reaction and recoil protons from the πp elastic scattering were successfully observed in the data taken in the summer 2018. The rest of data taking is coming in the spring 2019.

Published
2018

30. First Determination of the Level Structure of an sd -Shell Hypernucleus, FΛ19

Author

Manami Fujita, Manami Nakagawa, S. H. Hwang, Hitoshi Sugimura, T. Hayakawa, N. Ichige, T. J. Moon, K. Tanida, K. Miwa, S. Y. Suzuki, Atsushi Sakaguchi, Shunsuke Kanatsuki, Satoshi Sato, Ryotaro Honda, Takeshi Koike, Tokujiro Yamamoto, Y. Ogura, Hiroyuki Sako, Nobuyuki Chiga, Kanae Aoki, Petr Evtoukhovitch, Kensuke Kobayashi, Hiroyuki Ekawa, T. Takahashi, S. Kinbara, Mifuyu Ukai, Kenji Hosomi, Seongbae Yang, Kotaro Shirotori, Shuhei Hayakawa, S. Suto, Hitoshi Tamura, M. Ikeda, Kenichi Imai, A. Feliciello, Jihwa Lee, Yudai Ichikawa, Yuya Akazawa, Y. Sasaki, Z. Tsamalaidze, S. Ishimoto, S. H. Kim, J. K. Ahn, Y. Togawa, Shoichi Hasegawa, Tomofumi Nagae, Y. Nakada, and Taofeng Wang

Subjects
Physics, 010308 nuclear & particles physics, Theoretical models, Shell (structure), General Physics and Astronomy, Hypernucleus, 01 natural sciences, 0103 physical sciences, Level structure, Atomic physics, 010306 general physics, Ground state, Energy (signal processing), Excitation
Abstract

We report on the first observation of γ rays emitted from an sd-shell hypernucleus, _{Λ}^{19}F. The energy spacing between the ground state doublet, 1/2^{+} and 3/2^{+} states, of _{Λ}^{19}F is determined to be 315.5±0.4(stat)_{-0.5}^{+0.6}(syst) keV by measuring the γ-ray energy of the M1(3/2^{+}→1/2^{+}) transition. In addition, three γ-ray peaks are observed and assigned as E2(5/2^{+}→1/2^{+}), E1(1/2^{-}→1/2^{+}), and E1(1/2^{-}→3/2^{+}) transitions. The excitation energies of the 5/2^{+} and 1/2^{-} states are determined to be 895.2±0.3(stat)±0.5(syst) and 1265.6±1.2(stat)_{-0.5}^{+0.7}(syst) keV, respectively. It is found that the ground state doublet spacing is well described by theoretical models based on existing s- and p-shell hypernuclear data.

Published
2018

31. Repulsion and absorption of the Σ -nucleus potential for Σ−−He5 in the Li6(π−,K+) reaction

Author

Ryotaro Honda, Yoshiharu Hirabayashi, and Toru Harada

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences, Nuclear theory, Spectral line
Abstract

We study phenomenologically inclusive spectra of the $^{6}\mathrm{Li}({\ensuremath{\pi}}^{\ensuremath{-}},\phantom{\rule{0.16em}{0ex}}{K}^{+})$ reaction at 1.2 GeV/$c$ within a distorted-wave impulse approximation with the optimal Fermi-averaging ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{K}^{+}{\mathrm{\ensuremath{\Sigma}}}^{\ensuremath{-}}\phantom{\rule{0.16em}{0ex}}t$ matrix. We attempt to clarify the property of a $\mathrm{\ensuremath{\Sigma}}$-nucleus potential for ${\mathrm{\ensuremath{\Sigma}}}^{\ensuremath{-}}\text{\ensuremath{-}}^{5}\mathrm{He}$ by comparing the calculated spectra with the data of the J-PARC E10 experiment. The result shows that the repulsive and absorptive components of the ${\mathrm{\ensuremath{\Sigma}}}^{\ensuremath{-}}\text{\ensuremath{-}}^{5}\mathrm{He}$ potential provide the ability to explain the data of the continuum spectra in $\mathrm{\ensuremath{\Sigma}}$ and $\mathrm{\ensuremath{\Lambda}}$ regions; the strengths of ${V}_{\mathrm{\ensuremath{\Sigma}}}=+30\ifmmode\pm\else\textpm\fi{}10$ MeV and ${W}_{\mathrm{\ensuremath{\Sigma}}}=\ensuremath{-}26\ifmmode\pm\else\textpm\fi{}2$ MeV are favored within the Woods-Saxon potential, consistent with analyses for heavier nuclei. Effects of the size and potential range for ${\mathrm{\ensuremath{\Sigma}}}^{\ensuremath{-}}\text{\ensuremath{-}}^{5}\mathrm{He}$ in the neutron excess of $(N\ensuremath{-}Z)/(N+Z)=$ 0.2 are also discussed.

Published
2018

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

Author

D. H. Zhang, M. Hirose, Hitoshi Takahashi, Takeshi Koike, Shoichi Hasegawa, W. S. Jung, Megumi Naruki, R. Kiuchi, Yuki Fujikawa, M. Ichikawa, E. Umezaki, H. Kanauchi, S. Ashikaga, A. T. Moe, Jae-Yong Lee, Hiroki Ito, Kazuma Nakazawa, Yuji Ishikawa, T. L. Ma, Kiyoshi Tanida, Myint Kyaw Soe, Manami Fujita, S. H. Hwang, Y. Toyama, K. Inaba, Yoko Endo, Shin Hyung Kim, M. Minakawa, Mifuyu Ukai, Y. C. Han, Seongbae Yang, Tadayuki Takahashi, Yoshiro Takahashi, D. Nakashima, Ryotaro Honda, Takeshi O. Yamamoto, K. Oue, Y. Nagase, M. H. Kim, Toyoki Watabe, Khin Than Tint, Hiroyuki Sako, Shuhei Hayakawa, S. Y. Ryu, S. Y. Matsumoto, Shunsuke Kanatsuki, Hidetaka Kobayashi, Manami Nakagawa, T. Akaishi, C. S. Yoon, Masaharu Ieiri, Kotaro Shirotori, K. Ito, Takayoshi Kawai, Susumu Sato, A. Koshikawa, Yuya Akazawa, R. Goto, Z. Zhang, S. Kinbara, K. Watanabe, Y. Ogura, S. Ozawa, Aye Moh Moh Theint, Junya Yoshida, N. Fujioka, J. K. Ahn, A. Iskendir, S. Bleser, A. N. L. Nyaw, T. Nanamura, T. Hashimoto, K. Hoshino, J. Y. Sohn, Manabu Moritsu, Kenichi Imai, K. N. Suzuki, K. Hicks, S. Hoshino, T. Takeda, Y. Sasaki, J. W. Lee, Yudai Ichikawa, M. Ohashi, E. Hayata, Yoshihiro Sato, Hirokazu Tamura, M. M. Soe, Koji Miwa, B. Bassalleck, A. Kasagi, Kenji Hosomi, T. J. Moon, Hitoshi Sugimura, T. Hayakawa, Masahiro Yoshimoto, Hiroyuki Ekawa, Y. Nakada, K. Agari, Josef Pochodzalla, Erina Hirose, Kazuya Kobayashi, and F. Schupp

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Binding energy, Nuclear Theory, Hyperon, General Physics and Astronomy, FOS: Physical sciences, Hypernucleus, Lambda, 01 natural sciences, 0103 physical sciences, Production (computer science), ddc:530, J-PARC, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

A double-$\Lambda$ hypernucleus, ${}_{\Lambda\Lambda}\mathrm{Be}$, was observed by the J-PARC E07 collaboration in nuclear emulsions tagged by the $(K^{-},K^{+})$ reaction. This event was interpreted as a production and decay of $ {}_{\Lambda\Lambda}^{\;10}\mathrm{Be}$, ${}_{\Lambda\Lambda}^{\;11}\mathrm{Be}$, or ${}_{\Lambda\Lambda}^{\;12}\mathrm{Be}^{*}$ via $\Xi^{-}$ capture in ${}^{16}\mathrm{O}$. By assuming the capture in the atomic 3D state, the binding energy of two $\Lambda$ hyperons$\,$($B_{\Lambda\Lambda}$) of these double-$\Lambda$ hypernuclei are obtained to be $15.05 \pm 0.11\,\mathrm{MeV}$, $19.07 \pm 0.11\,\mathrm{MeV}$, and $13.68 \pm 0.11\,\mathrm{MeV}$, respectively. Based on the kinematic fitting, ${}_{\Lambda\Lambda}^{\;11}\mathrm{Be}$ is the most likely explanation for the observed event., Comment: 11 pages, 3 figures

Published
2018
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33. Development of a cylindrical tracking detector with multichannel scintillation fibers and pixelated photon detector readout

Author

Ryotaro Honda, Koji Miwa, T. Shiozaki, Nobuyuki Chiga, and Yuya Akazawa

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Scintillation, Photon, Physics::Instrumentation and Detectors, business.industry, Detector, Tracking (particle physics), Particle identification, Optics, Silicon photomultiplier, Fiber, business, Instrumentation
Abstract

We are developing a cylindrical tracking detector for a Σp scattering experiment in J-PARC with scintillation fibers and the Pixelated Photon Detector (PPD) readout, which is called as cylindrical fiber tracker (CFT), in order to reconstruct trajectories of charged particles emitted inside CFT. CFT works not only as a tracking detector but also a particle identification detector from energy deposits. A prototype CFT consisting of two straight layers and one spiral layer was constructed. About 1100 scintillation fibers with a diameter of 0.75 mm (Kuraray SCSF-78 M) were used. Each fiber signal was read by Multi-Pixel Photon Counter (MPPC, HPK S10362-11-050P, 1×1 mm 2 , 400 pixels) fiber by fiber. MPPCs were handled with Extended Analogue Silicon Photomultipliers Integrated ReadOut Chip (EASIROC) boards, which were developed for the readout of a large number of MPPCs. The energy resolution of one layer was 28% for a 70 MeV proton where the energy deposit in fibers was 0.7 MeV.

Published
2015

34. A beam position fiber counter with scintillation fibers and multi-pixel photon counter for high intensity beam operation

Author

Shoichi Hasegawa, Nobuyuki Chiga, Y. Matsumoto, Ryotaro Honda, Koji Miwa, and Kenichi Imai

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Spectrometer, Physics::Instrumentation and Detectors, business.industry, Resolution (electron density), Signal, Silicon photomultiplier, Optics, Beamline, Physics::Accelerator Physics, Fiber, business, Instrumentation, Beam (structure)
Abstract

A beam position fiber counter consisting of the scintillation fiber (Kuraray SCSF-78 M) and a multi-pixel photon counter (HPK S10362-11-100P) was developed in order to handle a 10 MHz secondary pion beam in the J-PARC E40 experiment. This counter was installed at the entrance of the beam line spectrometer at the K1.8 experimental area in J-PARC and used for the momentum reconstruction. In order to suppress the accidental background and reconstruct the beam momentum, a good timing resolution better than 0.8 ns (σ) and a good position resolution better than 200 μ m were simultaneously required for the counter. These requirements were well achieved by reading the 320 fibers with a diameter of 1 mm, which were arranged in a staggered position, with MPPC fiber by fiber. The signal induced from each MPPC was handled with an Extended Analogue SiPM Integrated ReadOut Chip (EASIROC) developed by Omega/IN2P3 in France. In addition, the timing of the discriminated signals from EASIROC was measured by a FPGA-based multi-hit TDC implemented into Spartan-6. Finally, we obtained the timing resolution of 0.68 ns (σ) and the position resolution of 190 μ m (σ) under the 9 MHz beam condition using a pion beam.

Published
2015

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

Author

Y. Nakada, T. J. Moon, Hitoshi Sugimura, N. Amano, Jae-Yong Lee, Shin Hyung Kim, Ryotaro Honda, Yudai Ichikawa, Kohei Takenaka, Manami Nakagawa, Hiroyuki Ekawa, Z. Tsamalaidze, T. Nanamura, Shunsuke Kanatsuki, Tomofumi Nagae, Mifuyu Ukai, Shoichi Hasegawa, Toshiyuki Takahashi, Kiyoshi Tanida, Shuhei Hayakawa, Susumu Sato, Hitoshi Takahashi, Seigo Kato, Atsushi Sakaguchi, Megumi Naruki, Takeshi O. Yamamoto, Hiroyuki Fujioka, Elena Botta, Manami Fujita, Toshiyuki Gogami, Koji Miwa, Tomonari Hayakawa, Kenji Hosomi, Hiroyuki Sako, S. Marcello, Petr Evtoukhovitch, Alessandro Feliciello, Y. Sasaki, Tomoyuki Hasegawa, Manabu Moritsu, Kenichi Imai, Jung Keun Ahn, Erina Hirose, Kazuya Kobayashi, Kotaro Shirotori, Yuya Akazawa, Hirokazu Tamura, Shinji Kinbara, Kanae Aoki, and W. S. Jung

Subjects
Nuclear physics, Physics, Spectrometer, Strangeness production, J-PARC, Strangeness, Mass spectrometry, Spectroscopy, Particle detector, Hybrid mass spectrometer
Published
2017

36. Missing-mass spectroscopy with the Li6(π−,K+)X reaction to search for HΛ6

Author

Michelangelo Agnello, Ryotaro Honda, Nobuyuki Chiga, M. Endo, A. Feliciello, H. Fujioka, Tsuneo Fukuda, H. C. Bhang, Kanae Aoki, S. Ajimura, J. K. Ahn, Petr Evtoukhovitch, Yuya Akazawa, and N. Amano

Subjects
Physics, 010308 nuclear & particles physics, Sigma, Hypernucleus, Lambda, 01 natural sciences, Spectral line, Particle identification, 0103 physical sciences, Bound state, Pi, Gamma spectroscopy, Atomic physics, 010306 general physics
Abstract

We searched for the bound state of the neutron-rich Lambda-hypernucleus H-6(Lambda), using the Li-6(pi(-), K+)X double charge-exchange reaction at a pi-beam momentum of 1.2 GeV/c at J-PARC. A total of 1.4 x 10(12) pi(-) was driven onto a Li-6 target of 3.5-g/cm(2) thickness. No event was observed below the bound threshold, i.e., the mass of H-4(Lambda) + 2n, in the missing-mass spectrum of the Li-6(pi(-), K+) X reaction in the 2 degrees < theta(pi K) < 20 degrees angular range. Furthermore, no event was found up to 2.8 MeV/c(2) above the bound threshold. We obtained the double-differential cross section spectra of the Li-6(pi(-), K+)X reaction in the angular range of 2 degrees < theta(pi K) < 14 degrees. An upper limit of 0.56 nb/sr (90% C.L.) was obtained for the production cross section of the H-6(Lambda) hypernucleus bound state. In addition, not only the bound state region, but also the Lambda continuum region and part of the Sigma(-) quasifree production region of the Li-6(pi(-), K+) reaction were obtained with high statistics. The present missing-mass spectrum will facilitate the investigation of the Sigma(-) -nucleus optical potential for Sigma(-) -He-5 through spectrum shape analysis.

Published
2017

37. Scattered Proton Detection System for Σp Scattering Experiment with the Cylindrical Scintillating Fiber Tracker and BGO Calorimeters

Author

Atsushi Sakaguchi, Y. Nakada, Koji Miwa, Shoichi Hasegawa, Yuya Akazawa, Shuhei Hayakawa, Ryotaro Honda, and M. Ikeda

Subjects
Physics, Optics, Scintillating fiber, Proton, law, business.industry, Scattering, Cyclotron, Resolution (electron density), business, law.invention
Abstract

The scattered proton detection system CATCH is under construction for the Σp scattering experiment at J-PARC (J-PARC E40). CATCH is composed of a cylindrical scintillating fiber tracker (CFT) and BGO calorimeters. We performed a test experiment at the Cyclotron and Radioisotope Center in Tohoku University to evaluate the CFT performance. We obtained an energy resolution of scintillating fibers as (14.29 ± 0.14)% at an energy deposit of 1.5 MeV and proton-hit detection efficiency of CFT as (97.30 ± 0.02) and (87.63 ± 0.04)% for UV and Φ layer, respectively.

Published
2017

38. Gamma-ray Spectroscopy of Hypernuclei — Recent Results and Prospect at J-PARC

Author

Hiroyuki Sako, Kenichi Imai, A. Feliciello, K. Tanabe, S. Suto, S. H. Hwang, Toshiyuki Gogami, Koji Miwa, Y. Sasaki, M. Ikeda, Hirokazu Tamura, Yuya Akazawa, Kenji Hosomi, Jihwa Lee, S. Kinbara, Shunsuke Kanatsuki, S. Marcello, Y. Ogura, S. Y. Suzuki, T. Shiozaki, Petr Evtoukhovitch, Sho Nagao, Mifuyu Ukai, S. H. Kim, K. Shirotori, Michelangelo Agnello, Ryotaro Honda, Shoichi Hasegawa, Manami Fujita, Takeshi O. Yamamoto, N. Ichige, M. H. Kim, Kiyoshi Tanida, T. J. Moon, Tomofumi Nagae, T. Takahashi, Atsushi Sakaguchi, Elena Botta, Shuhei Hayakawa, Nobuyuki Chiga, Shigeru Ishimoto, Susumu Sato, Y. Nakada, Takeshi Koike, N. Amano, Hiroyuki Ekawa, Kanae Aoki, Hitoshi Sugimura, T. Hayakawa, Yudai Ichikawa, Z. Tsamalaidze, and Manami Nakagawa

Subjects
Physics, Nuclear physics, Gamma spectroscopy, J-PARC
Published
2017

39. The Recent Results of Strangeness Photoproduction in the Threshold Region at ELPH-Tohoku

Author

Osamu Hashimoto, S. Kiyokawa, Tadaaki Tamae, T. Fujibayashi, A. Iguchi, Koji Miwa, Takashi Nishizawa, Takeshi Koike, Hiroki Kanda, Tie-Shan Wang, Y. Kaneko, Kenji Hosomi, Mifuyu Ukai, Toshiyuki Gogami, Kazushige Maeda, Kenta Futatsukawa, A. Okuyama, P. Bydžovský, Takatsugu Ishikawa, N. Maruyama, Sho Nagao, Hirohito Yamazaki, F. Yamamoto, Hirokazu Tamura, Yu Fujii, Ryotaro Honda, Nobu Terada, Brian Beckford, Yuma Kasai, M. Sotona, Takeshi O. Yamamoto, Satoshi Nakamura, T. Kawasaki, C. Kimura, Y. C. Han, Kentaro Hirose, Kyo Tsukada, T. Fujii, M. Matsubara, Masashi Kaneta, and Y. Miyagi

Subjects
Physics, Nuclear physics, Scattering cross-section, biology, Elph, Strangeness, Photon energy, biology.organism_classification
Published
2017

40. Search for Excited State of Σ Hypernucleus in the J-PARC E13 Experiment

Author

T. Moon, Kenichi Imai, A. Feliciello, Seongbae Yang, Manami Nakagawa, Y. Nakada, Mifuyu Ukai, S. H. Kim, Yudai Ichikawa, E. Botta, Shoichi Hasegawa, S. Suto, T. Shiozaki, M. Ikeda, S. H. Hwang, S. Marcello, Ryotaro Honda, Kiyoshi Tanida, S. Ishimoto, K. Tanabe, Z. Tsamalaidze, N. Amano, N. Chiga, Hirokazu Tamura, Tomofumi Nagae, Sho Nagao, T. Koike, Jihwa Lee, Manami Fujita, Hiroyuki Sako, Kotaro Shirotori, S. Y. Suzuki, Yuya Akazawa, Petr Evtoukhovitch, Kanae Aoki, Susumu Sato, Y. Yamamoto, N. Ichige, M. H. Kim, T. Takahashi, Atsushi Sakaguchi, Toshiyuki Gogami, S. Kinbara, Koji Miwa, Kenji Hosomi, Michelangelo Agnello, Hiroyuki Ekawa, Hitoshi Sugimura, Shuhei Hayakawa, T. Hayakawa, S. Kanatsuki, Y. Sasaki, and Y. Ogura

Subjects
Physics, Baryon, Nuclear physics, Nuclear reaction, Particle physics, Isospin, Excited state, Hadron, Hyperon, J-PARC, Hypernucleus
Published
2017

41. Search For A Ξ Bound State In The 12C(K-,K+)X Reaction At 1.8 Gev/c

Author

W. S. Jung, T. Takahashi, Hirokazu Tamura, S. Marcello, K. Shirotori, Megumi Naruki, Kenichi Imai, A. Feliciello, Koji Miwa, Shoichi Hasegawa, Mifuyu Ukai, Kiyoshi Tanida, Manami Fujita, Ryotaro Honda, Kanae Aoki, Tomofumi Nagae, Manami Nakagawa, Y. Nakada, Kenji Hosomi, Hiroyuki Sako, Shunsuke Kanatsuki, Yudai Ichikawa, Kensuke Kobayashi, S. Kimbara, Jihwa Lee, Takeshi O. Yamamoto, Petr Evtoukhovitch, Z. Tsamalaidze, Elena Botta, Takehisa Hasegawa, Susumu Sato, Aya Sakaguchi, Toshiyuki Gogami, S. H. Hayakawa, Yuya Akazawa, T. J. Moon, S. H. Kim, J. K. Ahn, Hitoshi Sugimura, T. Hayakawa, Hiroyuki Ekawa, T. Nanamura, and Y. Sasaki

Subjects
Physics, Nuclear physics, Full width at half maximum, Spectrometer, Resolution (electron density), Bound state, Hadron, Intensity (heat transfer), Energy (signal processing), Beam (structure)
Abstract

We have carried out a pilot data taking of the J-PARC E05 experiment to search for the bound state peaks of $^{12}_\Xi$Be in the $^{12}$C$(K^-, K^+)X$ reaction at 1.8 GeV/$c$. The measurement was performed at the K1.8 beam line of the J-PARC hadron experimental hall with a typical $K^-$ beam intensity of $6\times 10^{5}$ every six seconds. So far the best energy resolution of about 6 MeV$_{FWHM}$ was achieved with the existing SKS spectrometer. With a reasonable statistics, we have succeeded to observe peak structures in the bound region, which seems to suggest that the potential depth of $\Xi$ would be deeper than 14 MeV estimated in the previous measurements.

Published
2017

42. Measurement of the Vector Meson Spectral Modification in the Nuclear Medium at J-PARC

Author

Tomonori Takahashi, Wataru Nakai, Hideki Hamagaki, Koki Kanno, Hikari Murakami, Megumi Naruki, Kazuya Aoki, Tatsuya Chujo, Y. Obara, Yuhei Morino, S. Sawada, Michiko Sekimoto, Hitoshi Sugimura, Hiroyuki Sako, Y. Komatsu, Yosuke Watanabe, Fuminori Sakuma, H. En'yo, S. Ashikaga, Takuya Shibukawa, Akio Kiyomichi, Kenta Shigaki, Hiroyuki Noumi, S. Miyata, Susumu Sato, Ryotaro Honda, S. Yokkaichi, Shunichi Esumi, Takao Sakaguchi, K. Ozawa, and Ryotaro Muto

Subjects
Physics, Quark, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Elementary particle, Nuclear matter, 01 natural sciences, Spectral line, 0103 physical sciences, J-PARC, Vector meson, 010306 general physics
Published
2017

43. Development of a silicon micro-strip detector for tracking high intensity secondary beams

Author

R. Kiuchi, Yudai Ichikawa, Satoshi Sato, Ryotaro Honda, Toyoki Watabe, Shoichi Hasegawa, Kiyoshi Tanida, H. Asano, C. Joo, Hiroyuki Sako, Kenichi Imai, Hitoshi Sugimura, Kotaro Shirotori, and Kazuma Nakazawa

Subjects
Physics, Nuclear and High Energy Physics, Electron mobility, Meson, Silicon, Physics::Instrumentation and Detectors, business.industry, Detector, Resolution (electron density), chemistry.chemical_element, Tracking (particle physics), Optics, Data acquisition, chemistry, High Energy Physics::Experiment, business, Instrumentation, Beam (structure)
Abstract

A single-sided silicon micro-strip detector (SSD) has been developed as a tracking detector for hadron experiments at J-PARC where secondary meson beams with intensities of up to 10 8 Hz are available. The performance of the detector has been investigated and verified in a series of test beam experiments in the years 2009–2011. The hole mobility was deduced from the analysis of cluster events. The beam rate dependence was measured in terms of timing resolution, signal-to-noise ratio, and hit efficiency. This paper describes the detector with its read-out system, details of the test experiments, and discusses the performance achieved.

Published
2014

44. Search for HΛ6 hypernucleus by the Li6(π−,K+) reaction at pπ−=1.2 GeV/c

Author

A. O. Tokiyasu, Y. Shimizu, R. Kiuchi, N. Ishibashi, Michelangelo Agnello, Mifuyu Ukai, K. Shirotori, Megumi Naruki, C. W. Joo, K. Hosomi, T. Soyama, T. Shiozaki, Hiroyuki Tamura, Hiroyuki Noumi, Ryotaro Honda, Susumu Sato, Petr Evtoukhovitch, M. Sekimoto, B. J. Roy, Shuhei Hayakawa, P. K. Saha, K. Matsuoka, Ryosuke Ota, Atsushi Sakaguchi, R. Iwasaki, T. O. Yamamoto, H. C. Bhang, T. Takahashi, Y. Igarashi, Kenichi Imai, Chhanda Samanta, Koji Miwa, Seongbae Yang, A. Feliciello, S. Ajimura, Koichi Matsuda, K. Yoshida, Tomokazu Fukuda, Yutaka Mizoi, H. Fujioka, Hiroyuki Sako, J. K. Lee, Masaki Endo, Shoichi Hasegawa, Jae-Yong Lee, Kiyoshi Tanida, Nobuyuki Chiga, J. K. Ahn, Kanae Aoki, K. Tanabe, Y. Yamamoto, M. Moritsu, Hitoshi Sugimura, Takahiro Tanaka, Tomofumi Nagae, S. Nagamiya, Y. Sasaki, Manami Nakagawa, Y. Matsumoto, V. Samoilov, Toshiyuki Takahashi, Yudai Ichikawa, Z. Tsamalaidze, N. Amano, S. H. Hwang, and Yuya Akazawa

Subjects
Nuclear physics, Baryon, Physics, Nuclear and High Energy Physics, Particle decay, Meson, Isotopes of lithium, Hadron, Neutron, Atomic physics, Nucleon, Hypernucleus
Abstract

We have carried out an experiment to search for a neutron-rich hypernucleus, 6 H, by the 6 Li(π − , K + ) reaction at pπ− =1.2 GeV/c. The obtained missing-mass spectrum with an estimated energy resolution of 3.2 MeV (FWHM) showed no peak structure corresponding to the 6 H hypernucleus neither below nor above the 4 H+2n particle decay threshold. An upper limit of the production cross section for the bound 6 H hypernucleus was estimated to be 1.2 nb/sr at 90% confidence level.

Published
2014

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

Author

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

Subjects
BINDING energy, ENERGY function, WASTE products
Abstract

We have measured an inclusive missing-mass spectrum of the 12 C(K−, p) reaction over wide energy region at the kaon incident momentum of 1.8 GeV/c at J-PARC K1.8 beam line. This measurement was carried out as a by-product of a pilot run of J-PARC E05 experiment, which searched for the Ξ-hypernuclei via 12C(K−, K+) reaction. We have compared the observed missing-mass spectrum with a DWIA calculation to study the K̄-nucleus interaction. In this comparison, we have changed the depth of both real and imaginary parts of the optical potential between the K̄ and nucleus. It is found that the observed spectrum is best reproduced by the calculation of the potential depth of V0 ∼ −80 MeV (real part) and W0 ∼ −40 MeV (imaginary part). On the other hand, we have observed a definitive excess around the deeply bound region BK ≳ 100 MeV. The excess cannot be explained by the any optical potential and quasi-free background reaction. It is well fitted with a Breit-Wigner function with a binding energy of 90 MeV and a width of 100 MeV, which can be interpreted as a deeply bound Λ(1405) nucleus. [ABSTRACT FROM AUTHOR]

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

Author

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

Subjects
BARYONS, BOUND states, FLAVOR, AMBIGUITY, WEATHER
Abstract

For the full understanding of baryon-baryon interactions in flavor SU(3), the ΞN interaction is the last missing piece of information. So far, we have revealed the ΛN interaction to be attractive (UΛ ≈ 30 MeV), and ΣN interaction to be repulsive in the medium to heavy mass-number region. The ΛΛ bonding energy is weakly attractive. While we have a few experimental observations suggesting the ΞN interaction would be attractive, there still exist large theoretical ambiguities weather it is attractive or not. Experimental determinations on the existence of bound states of Ξ hypernuclei by observing bound-state peaks are strongly awaited. In this report, a new preliminary result on the missing-mass spectrum of a 12C(K−, K+) reaction, which strongly suggests the existence of Ξ-hypernuclear bound states, is presented. [ABSTRACT FROM AUTHOR]

Published
2019
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47. The investigation of strangeness photoproduction in the threshold region at ELPH-Tohoku

Author

Y. Kaneko, S. Kiyokawa, Tadaaki Tamae, Yuma Kasai, T. Fujibayashi, Kazushige Maeda, M. Sotona, T. Kawasaki, Ryotaro Honda, Takeshi Koike, Hiromichi Yamazaki, Brian Beckford, Osamu Hashimoto, Hirokazu Tamura, N. Terada, Koji Miwa, C. Kimura, P. Bydžovský, T. Ishikawa, Hiroki Kanda, Masashi Kaneta, Kenta Futatsukawa, Y. C. Han, M. Matsubara, A. Okuyama, T. Fujii, Y. Miyagi, Kentaro Hirose, N. Maruyama, T. O. Yamamoto, K. Hosomi, A. Iguchi, Toshiyuki Gogami, Sho Nagao, Kyo Tsukada, Satoshi Nakamura, T. Wang, Y. Fujii, and F. Yamamoto

Subjects
Nuclear physics, Nuclear reaction, Physics, Baryon, Nuclear and High Energy Physics, Meson, Hadron, Neutron, Strangeness, Atomic physics, Nucleon, Sigma baryon
Abstract

The strangeness photoproduction processes near the threshold have been intensively studied by measuring K + in reactions such as γ + p → K + + Λ ( Σ 0 ) . There has been no reliable data on the neutron and as a consequence theoretical investigation suffered seriously from the lack of the data. We have an effort to measure the γ + d → K 0 ( Λ ) + X reaction in the π + π − ( p π − ) decay channel of K S 0 (Λ) using a liquid D2 target and internally-tagged photon beams ( E γ = 0.80 – 1.08 GeV ) at Research Center for Electron Photon Science (ELPH), Tohoku University. We have renewed the spectrometer (NKS2) and took data with a liquid D2 target in 2005–2007. More recently, we took data in 2010 after a detector upgrade in the vertex region to substantially increase the acceptance. The results of Λ single measurements on a deuterium target were obtained for differential cross-section as a function of momentum, as a function of angle, and integrated cross-section as a function of beam energy. The results are compared with recent theoretical studies: Isobar models (Kaon-MAID and Saclay-Lyon A) and a Regge-plus-Resonance model.

Published
2013

48. Gamma-ray spectroscopy of hypernuclei — present and future

Author

K. Shirotori, Kiyoshi Tanida, Petr Evtoukhovitch, Mifuyu Ukai, Seongbae Yang, T. O. Yamamoto, Ryotaro Honda, A. Sasaki, Hirokazu Tamura, Nobuyuki Chiga, Koji Miwa, Z. Tsamalaidze, Takeshi Koike, Alessandro Feliciello, S. Bufalino, Y. Sasaki, K. Hosomi, and Yue Ma

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Impurity, Gamma spectroscopy, Hypernucleus, Spectroscopy, Measure (mathematics)
Abstract

Recent results and future directions of the γ-ray spectroscopy of Λ hypernuclei are discussed. A further analysis of the last KEK experiment (E566) has revealed a new γ transition in 12ΛC at 6048 keV (preliminary), which is ascribed to the M 1 ( 1 3 − → 1 1 − ) transition. At J-PARC, studies will be extended from p-shell to s-shell and sd-shell hypernuclei. In the first part of the J-PARC E13 experiment, we will measure the 4ΛHe( 1 + → 0 + ) transition to study charge-symmetry breaking in the ΛN interaction and investigate the 19ΛF hypernucleus to study ΛN spin–spin interaction further using one of the sd-shell hypernuclei. In the second part of E13, we will precisely measure the spin-flip B ( M 1 ) value for the 7ΛLi( 3 / 2 + → 1 / 2 + ) transition. Beyond E13, we plan to study impurity effects by observing possible changes in nuclear deformation caused by the presence of a Λ in sd-shell hypernuclei, as well as to investigate various heavier Λ hypernuclei in order to precisely determine the energies of Λ single-particle orbits.

Published
2013

49. Study of Strangeness Photoproduction on the Neutron in the Threshold Region

Author

S. Kiyokawa, Tadaaki Tamae, A. Iguchi, T. Fujibayashi, Hiroki Kanda, Toshiyuki Gogami, Kenta Futatsukawa, C. Kimura, Tie Shang Wang, Brian Beckford, T. Kawasaki, D. Kawama, Yu Fujii, M. Matsubara, N. Maruyama, Yuma Kasai, Masashi Kaneta, Y. Miyagi, Sho Nagao, Kenji Hosomi, Kentaro Hirose, T. Fujii, Kotaku Suzuki, Ryotaro Honda, Kazushige Maeda, Hirokazu Tamura, Y. Kaneko, T. O. Yamamoto, N. Terada, Satoshi Nakamura, Kyo Tsukada, Koji Miwa, Osamu Hashimoto, Y. C. Han, Tomofumi Maruta, Hirohito Yamazaki, Takeshi Koike, A. Okuyama, Takatsugu Ishikawa, and F. Yamamoto

Subjects
Physics, Meson, Nuclear Theory, Hyperon, Strangeness production, Photon energy, Strangeness, Atomic and Molecular Physics, and Optics, Charged particle, Nuclear physics, Cross section (physics), High Energy Physics::Experiment, Neutron, Atomic physics, Nuclear Experiment
Abstract

Photoproduction of the neutral kaon on the deuteron has been investigated at the Research Center for Electron Photon Science, Tohoku University. We constructed the Neutral Kaon Spectrometer-2 for the detection of charged particles from the decay of the neutral kaon and the hyperon. We obtained a momentum distribution of K 0 with the inclusive measurement. It was consistent with the previous measurement. The total cross section of γ + d → K 0 + Λ + p was estimated from the measured integral cross section of γ + d → Λ + X. The total cross section with respect to the photon energy was compared with the theoretical calculations. It favored the Saclay-Lyon A model calculation with the ratio of the neutral to charged coupling constants of the axial-vector meson, K 1, as ~ −1.5. The energy dependence and the magnitude of the total cross section were similar to the total cross section of γ + p → K + Λ.

Published
2013

50. Study of γ d → π + π − d Reaction in an Energy Region of 0.67 ≤ E γ ≤ 1.08 GeV

Author

C. Kimura, T. Fujii, Osamu Hashimoto, T. Ishikawa, Koji Miwa, Brian Beckford, N. Matsubara, Yuma Kasai, Y. C. Han, Y. Kaneko, T. Fujibayashi, K. Hosomi, Kenta Futatsukawa, T. Kawasaki, Hirohito Yamazaki, N. Terada, Takeshi Koike, Hajime Shimizu, Masashi Kaneta, Yu Fujii, Hitoshi Tamura, Kazushige Maeda, T. O. Yamamoto, Y. Miyagi, A. Okuyama, Kentaro Hirose, Hiroki Kanda, S. Kiyokawa, Tadaaki Tamae, Ryotaro Honda, Kyo Tsukada, A. Iguchi, Toshiyuki Gogami, F. Yamamoto, Sho Nagao, and Satoshi Nakamura

Subjects
Physics, Range (particle radiation), Photon, Nuclear Theory, Electron, Photon energy, Atomic and Molecular Physics, and Optics, Charged particle, Nuclear physics, Pion, Deuterium, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Energy (signal processing)
Abstract

Double charged pion photoproductions from the deuteron have been studied at Research Center for Electron Photon Science (ELPH), Tohoku University. Tagged photon beams in an energy range of 0.67 ≤ E γ ≤ 1.08 GeV were impinged on the liquid deuteron target. Produced charged particles were observed with the Neutral Kaon Spectrometer2 (NKS2). The γ d → π + π − d process was clearly separated among the three charged tracks. We obtained the photon energy dependence of the normalized yields of this process.

Published
2013

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