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1. New directions in hypernuclear physics

Author

Nami Saito, Masato Taki, Kazuma Nakazawa, Takehiko R. Saito, Nasser Kalantar-Nayestanaki, Abdul Muneem, Christophe Rappold, Christoph Scheidenberger, A. Kasagi, Y.K. Tanaka, Yue Ma, Xiaohong Zhou, Junya Yoshida, Vasyl Drozd, He Wang, Samuel Escrig, Hiroyuki Ekawa, Yan He, Masahiro Yoshimoto, Manami Nakagawa, Wenbou Dou, M. Kavatsyuk, Enqiang Liu, Shizu Minami, Helmholtz International Center for FAIR, RIKEN Nishina Center for Accelerator-Based Science, Gifu University, Japan Society for the Promotion of Science, and Comunidad de Madrid

Subjects
Physics, Particle physics, Strange quark, High Energy Physics::Phenomenology, Nuclear Theory, Hyperon, General Physics and Astronomy, Hypernucleus, Baryon, Nuclear force, Neutron, Subatomic particle, Nuclear Experiment, Hypertriton
Abstract

11 pags. 3 figs., 1 tab., A hypernucleus, a subatomic bound system with at least one hyperon, is a great test ground to investigate nuclear forces and general baryonic interactions with up, down and strange quarks. Hypernuclei have been extensively studied for almost seven decades in reactions involving cosmic rays and with accelerator beams. In recent years, experimental studies of hypernuclei have entered a new stage using energetic collisions of heavy-ion beams. However, these investigations have revealed two puzzling results related to the lightest three-body hypernuclear system, the so-called hypertriton, and the unexpected existence of a bound state of two neutrons with a Λ hyperon. Solving these puzzles will not only impact our understanding of the fundamental baryonic interactions with strange quarks but also of the nature of the deep interior of neutron stars. In this Perspective, we discuss approaches to solving these puzzles, including experiments with heavy-ion beams and the analysis of nuclear emulsions using state-of-the-art technologies. We summarize ongoing projects and experiments at various facilities worldwide and outline future perspectives., Discussions presented for the WASA-FRS experiment here are based on the experiment S447, which is currently scheduled in 2022 at the FRS at the GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt (Germany) in the context of FAIR Phase-0. The authors thank the accelerator departments at GSI and IMP, the FRS department at GSI and the Experiment Electronics department at GSI for the technical support. The authors thank the J-PARC E07 collaboration to provide us the nuclear emulsion data. The authors thank Luise Doersching-Steitz of GSI, Rita Krause of GSI, Yukiko Kurakata of RIKEN, Daniela Press of GSI, Miao Yang of IMP and Xiaohua Yuan of IMP for supporting the projects, including the administrative works. The authors also thank Risa Kobayashi of RIKEN and Yoko Tsuchii of Gifu University for their technical support in mining hypertriton events in the E07 nuclear emulsions. KN, JY, and MY acknowledge support by JSPS KAKENHI Grant Numbers JP23224006, JP16H02180, JP20H00155, and JP20J00682, and MEXT KAKENHI Grant Numbers JP24105002 (Grant-in-Aid for Scientific Research on Innovative Areas 2404), JP18H05403, and JP19H05147 (Grant-in-Aid for Scientific Research on Innovative Areas 6005). SE and CR are supported by the grant 2019-T1/TIC-13194 of the program "Atracción de Talento Investigador" of the Community of Madrid.

Published
2021

2. Precise measurement on the binding energy of hypertriton from the nuclear emulsion data using analysis with machine learning

Author

Ayumi Kasagi, Enqiang Liu, Manami Nakagawa, Hiroyuki Ekawa, Junya Yoshida, Wenbo Dou, Abdul Muneem, Kazuma Nakazawa, Christophe Rappold, Nami Saito, Takehiko Saito, Masato Taki, Yoshiki Tanaka, and He Wang

Subjects
Nuclear emulsion, Hypernucleus, Binding energy, Machine learning, Hypertriton
Abstract

6 pags., 3 figs., A machine learning model has been developed to search for events of production and decay of a hypertriton in nuclear emulsion data, which is used for measuring the binding energy of the hypertriton at the best precision. The developed model employs an established technique for object detection and is trained with surrogate images generated by Monte Carlo simulations and image transfer techniques. The first hypertriton event has already been detected with the developed method only with 10−4 of the total emulsion data. It implies that a sufficient number of hypertriton events will soon be detected for the precise measurement of the hypertriton binding energy.

Published
2022

3. Investigation of the neutron imaging applications using fine-grained nuclear emulsion

Author

Abdul Muneem, Junya Yoshida, Hiroyuki Ekawa, Masahiro Hino, Katsuya Hirota, Go Ichikawa, Ayumi Kasagi, Masaaki Kitaguchi, Naoto Muto, Kenji Mishima, Jameel-Un Nabi, Manami Nakagawa, Naotaka Naganawa, and Takehiko R. Saito

Subjects
Physics - Instrumentation and Detectors, General Physics and Astronomy, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Neutron imaging is a nondestructive inspection technique that has a wide range of applications. One of the important aspects of neutron imaging is achieving a micrometer-scale spatial resolution. The development of a high-resolution neutron detector is a challenging task. As one potential solution to this task, we investigate whether neutron detectors based on fine-grained nuclear emulsions are suitable for high-resolution neutron imaging applications. High track density is necessary to improve the quality of neutron imaging. However, the available track analysis methods are difficult to apply under high track density conditions. Simulated images are used to determine the required track density for neutron imaging. A track density of the order of [Formula: see text] tracks per [Formula: see text] is sufficient to utilize neutron detectors for imaging applications. Contrast resolution was also investigated for image datasets with various track densities and neutron transmission rates. Moreover, experiments were performed for the neutron imaging of gadolinium-based gratings with known geometries. The grating structures were successfully resolved. The calculated [Formula: see text] 10%–90% edge response using the grayscale optical images of the grating slit with a periodic structure of 9 [Formula: see text]m was [Formula: see text] [Formula: see text]m.

Published
2022
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4. Study on the reusability of fluorescent nuclear track detectors using optical bleaching

Author

Abdul Muneem, Junya Yoshida, Hiroyuki Ekawa, Masahiro Hino, Katsuya Hirota, Go Ichikawa, Ayumi Kasagi, Masaaki Kitaguchi, Satoshi Kodaira, Kenji Mishima, Jameel-Un Nabi, Manami Nakagawa, Michio Sakashita, Norihito Saito, Takehiko R. Saito, Satoshi Wada, and Nakahiro Yasuda

Subjects
Physics - Instrumentation and Detectors, Radiation, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Instrumentation
Abstract

Fluorescent nuclear track detectors (FNTDs) based on Al${_2}$O${_3}$:C,Mg crystals are luminescent detectors that can be used for dosimetry and detection of charged particles and neutrons. These detectors can be utilised for imaging applications where a reasonably high track density, approximately of the order of 1 $\times$ $10^4$ tracks in an area of 100 $\times$ 100 $\mu$m$^2$, is required. To investigate the reusability of FNTDs for imaging applications, we present an approach to perform optical bleaching under the required track density conditions. The reusability was assessed through seven irradiation-bleaching cycles. For the irradiation, the studied FNTD was exposed to alpha-particles from an $^{241}$Am radioactive source. The optical bleaching was performed by means of ultraviolet laser light with a wavelength of 355 nm. Three dedicated regions on a single FNTD with different accumulated track densities and bleaching conditions were investigated. After every irradiation-bleaching cycle, signal-to-noise ratio was calculated to evaluate FNTD performance. It is concluded that FNTDs can be reused at least seven times for applications where accumulation of a high track density is required.

Published
2022

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. Achieving Submicrometer Spatial Resolution for Neutron Imaging With Nuclear Emulsion

Author

Naoto Muto, Manami Nakagawa, J Yoshida, A. Kasagi, Jameel Nabi, Masaaki Kitaguchi, Katsuya Hirota, Hiroyuki Ekawa, Naotaka Naganawa, Abdul Muneem, Masahiro Hino, Go Ichikawa, Saito Takehiko, and Kenji Mishima

Subjects
Optics, Materials science, business.industry, Neutron imaging, Nuclear emulsion, business, Image resolution
Abstract

Neutron imaging is a non-destructive inspection technique with a wide range of potential applications. One of the key technical interests concerning neutron imaging is to achieve micrometer-scale spatial resolution. However, developing a neutron detector with a high spatial resolution is a challenging task. Recent efforts are focused on achieving this milestone or even submicrometer spatial resolution. Herein, we introduce our technique for neutron imaging using a fine-grained nuclear emulsion and evaluate the spatial resolution. We used the fine-grained nuclear emulsion with a gadolinium-based Siemens star test pattern and a grating with a periodic structure of 9 μm. The deduced value of the spatial resolution is less than 1 μm using the developed technique. To the best of our knowledge, the submicrometer spatial resolution that we achieved using our method is the best among all reported neutron imaging devices.

Published
2021

7. Novel method for producing very-neutron-rich hypernuclei via charge-exchange reactions with heavy ion projectiles

Author

Manami Nakagawa, Hiroyuki Ekawa, and Takehiko R. Saito

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, 010308 nuclear & particles physics, Projectile, Hadron, Hyperon, FOS: Physical sciences, 01 natural sciences, Quantum molecular dynamics, Nuclear Theory (nucl-th), Nuclear physics, 0103 physical sciences, Nuclear fusion, Neutron, Heavy ion, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Charge exchange
Abstract

We propose a novel method for producing very-neutron-rich hypernuclei and corresponding resonance states by employing charge-exchange reactions via pp($^{12}$C, $^{12}$N $K^+$)n$\Lambda$ with single-charge-exchange and ppp($^{9}$Be, $^{9}$C $K^+$)nn$\Lambda$ with double-charge-exchange, both of which produce $\Lambda K^+$ in a target nucleus. The feasibility of producing very-neutron-rich hypernuclei using the proposed method was analysed by applying an ultra-relativistic quantum molecular dynamics model to a $^6$Li+$^{12}$C reaction at 2 $A$ GeV. The yields of very-neutron-rich hypernuclei, signal-to-background ratios, and background contributions were investigated. The proposed method is a powerful tool for studying very-neutron-rich hypernuclei and resonance states with a hyperon for experiments employing the Super-FRS facility at FAIR and HFRS facility at HIAF., Comment: The published version in European Physical Journal A has the following additional three references; Phys. Rev. C 98, 024903 (2018), Phys. Rev. C 100, 034904 (2019) and Nuclear Physics A 488, 187c (1988)

Published
2021

8. Solid–liquid Interface Screening SystemーApplication to the Screening of Antibiotic and Cytotoxic Substance-producing Fungi

Author

Manami Nakagawa, Seiya Nomura, Shinobu Oda, Teppei Kawahara, Kazuo Shin-ya, and Noritaka Kagaya

Subjects
0106 biological sciences, Antifungal Agents, food.ingredient, Cell Survival, Metabolite, Antineoplastic Agents, 01 natural sciences, Applied Microbiology and Biotechnology, Jurkat cells, Agar plate, 03 medical and health sciences, chemistry.chemical_compound, food, Cell Line, Tumor, 010608 biotechnology, Phase (matter), Drug Discovery, Humans, Cytotoxic T cell, Agar, Benzopyrans, Chromatography, High Pressure Liquid, 0303 health sciences, Chromatography, 030306 microbiology, Fungi, Public Health, Environmental and Occupational Health, Biological activity, Pigments, Biological, Solvent, chemistry, Fermentation, Saccharomycetales, Solvents, Drug Screening Assays, Antitumor, Hydrophobic and Hydrophilic Interactions
Abstract

A useful tool for the screening of fungi producing biologically active secondary metabolites such as antibiotics and cytotoxic substances has been developed. An agar plate-organic solvent interface cultivation (A/S-IFC) system, which comprised a hydrophobic organic solvent (upper phase) , a fungal mat (middle phase) and an agar plate (lower phase) , was constructed. The metabolite profiles were compared among the A/S-IFC, a traditional submerged cultivation (SmC) and an extractive liquid surface immobilization (Ext-LSI) system consisted of a hydrophobic solvent (upper phase) , a fungal cells-ballooned microspheres (middle phase) and a liquid medium (lower phase) , with high-performance liquid chromatography-photodiode array detector (HPLC-PDA) . In the A/S-IFC, many hydrophobic metabolites vastly different from those in the SmC were accumulated in the organic phase as with the Ext-LSI. For example, a valuable azaphilone, sclerotiorin, was remarkably produced into the organic phase in the A/S-IFC. The A/S-IFC was applied to the screening of antibiotic-producing fungi. As a result of paper disk method, it was found that 321 isolated among 811 strains produced antifungal metabolites (hit rate, 39.6%) . Furthermore, 8, 23, and 30 strains also produced cytotoxic metabolites against SKOV-3 (human ovary adenocarcinoma) , MESO-1 (human malignant pleural mesothelioma) , and Jurkat cells (immortalized human T lymphocyte) .

Published
2019

9. 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. Observation of Coulomb-Assisted Nuclear Bound State of Ξ−–N14 System

Author

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

Subjects
Physics, Binding energy, Hyperon, General Physics and Astronomy, State (functional analysis), Coupling (probability), 01 natural sciences, 0103 physical sciences, Bound state, Coulomb, Absorption (logic), Atomic physics, 010306 general physics, Energy (signal processing)
Abstract

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 unique identification of the reaction process as Ξ^{-}+^{14}N→_{Λ}^{10}Be+_{Λ}^{5}He. For the binding energy of the Ξ^{-} hyperon in the Ξ^{-}-^{14}N system a value of 1.27±0.21 MeV was deduced. The energy level of Ξ^{-} is likely a nuclear 1p state which indicates a weak ΞN-ΛΛ coupling.

Published
2021

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

Author

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

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, Spectrum (functional analysis), General Physics and Astronomy, Sigma, Lambda, 01 natural sciences, Momentum, 0103 physical sciences, Bound state, Mass spectrum, Atomic physics, Nuclear Experiment, 010306 general physics, Energy (signal processing), Bar (unit)
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.

Published
2020

12. Unique approach for precise determination of binding energies of hypernuclei with nuclear emulsion and machine learning

Author

Manami Nakagawa, Ayumi Kasagi, Enqiang Liu, Hiroyuki Ekawa, Junya Yoshida, Wenbo Dou, Yan He, Abdul Muneem, Kazuma Nakazawa, Christophe Rappold, Nami Saito, Takehiko R. Saito, Shohei Sugimoto, Masato Taki, Yoshiki K. Tanaka, He Wang, Yiming Gao, Ayari Yanai, and Masahiro Yoshimoto

Abstract

Hypertriton is the lightest hypernucleus and a benchmark in hypernuclear physics. However, it has recently been suggested that its lifetime and binding energy values may differ from the established values. To solve this puzzle, it is necessary to measure both values with a higher precision. For the precise measurement of the binding energy, we are aiming at developing a novel technique to measure the hypertriton binding energy with unprecedented accuracy by combining nuclear emulsion data and machine learning techniques. The analysis will be based on the J-PARC E07 nuclear emulsion data. Furthermore, a machine-learning model is being developed to identify other single and double-strangeness hypernuclei.

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. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 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

25. 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

26. 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

27. 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

28. 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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29. 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

30. 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

31. The First Gamma-ray Spectroscopic Study of sd-shell Hypernucleus, \(_{\Lambda }^{19}\text{F}\)

Author

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

Subjects
Physics, Isotopes of lithium, Binding energy, Shell (structure), Gamma ray, Gamma spectroscopy, Atomic physics, Hypernucleus, Spectroscopy, Semiconductor detector
Published
2017

32. 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

33. 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

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

Author

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

Subjects
Nuclear physics, Physics, medicine.anatomical_structure, Bar (music), medicine, J-PARC, Atomic physics, Nucleus
Published
2017

35. 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

36. Study of Neutron-Rich Hypernuclei by the (π −, K +) Reaction at J-PARC

Author

K. Matsuda, Hiroyuki Sako, S. Nagamiya, R. Kiuchi, Yutaka Mizoi, T. Soyama, Koji Miwa, C. Samanta, Kazuki Yoshida, Tomokazu Fukuda, Tadamitsu Kishimoto, Shuhei Hayakawa, Atsushi Sakaguchi, S. Ajimura, Tomohiko Takahashi, H. C. Bhang, Hiroyuki Noumi, Ryosuke Ota, O. Morra, Pranab Saha, M. Endo, Kenichi Imai, D. Faso, Kotaro Shirotori, Yuji Shimizu, T. Takahashi, L. Busso, Susumu Sato, K. Matsuoka, Ryotaro Honda, Hitoshi Sugimura, Toshihisa Tanaka, Manami Nakagawa, Yudai Ichikawa, N. Ishibashi, and Shoichi Hasegawa

Subjects
Physics, High rate, Particle physics, Silicon, Detector, chemistry.chemical_element, Lambda, Atomic and Molecular Physics, and Optics, Nuclear physics, chemistry, Neutron, J-PARC, Intensity (heat transfer), Beam (structure)
Abstract

We are planning to perform an experiment at J-PARC and produce new neutron-rich Λ hypernuclei by using the (π −, K +) reaction (J-PARC E10). As the first step, we are planning to produce $${^6_{\Lambda}{\rm H}}$$ hypernuclei with a 6Li target. To conduct this experiment, we are developing new detectors, those are scintillating fiber tracker, and silicon strip detector, for high rate operation to aim at increasing beam intensity up to 107/spill. As a result of beam test in Jun 2012, we are going to use high-rate beam at least 107/spill.

Published
2013

37. Observation of Spin-Dependent Charge Symmetry Breaking inΛNInteraction: Gamma-Ray Spectroscopy ofHeΛ4

Author

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

Subjects
Physics, Excited state, Binding energy, Bound state, General Physics and Astronomy, Charge (physics), Symmetry breaking, Atomic physics, Hypernucleus, Ground state, Energy (signal processing)
Abstract

The energy spacing between the spin-doublet bound state of _{Λ}^{4}He(1^{+},0^{+}) was determined to be 1406±2±2 keV, by measuring γ rays for the 1^{+}→0^{+} transition with a high efficiency germanium detector array in coincidence with the ^{4}He(K^{-},π^{-})_{Λ}^{4}He reaction at J-PARC. In comparison to the corresponding energy spacing in the mirror hypernucleus _{Λ}^{4}H, the present result clearly indicates the existence of charge symmetry breaking (CSB) in ΛN interaction. By combining the energy spacings with the known ground-state binding energies, it is also found that the CSB effect is large in the 0^{+} ground state but is vanishingly small in the 1^{+} excited state, demonstrating that the ΛN CSB interaction has spin dependence.

Published
2015

38. Measurement of the Λ Spin-flip B(M1) Value in Hypernuclei

Author

K. Tanida, Atsushi Sakaguchi, N. Amano, Tomofumi Nagae, K. Imai, S. Suzuki, Yudai Ichikawa, Taofeng Wang, Y. Sasaki, T. Haruyama, Z. Tsamalaidze, Y. Yamamoto, Kotaro Shirotori, V. Samoilov, S. H. Hwang, Manami Nakagawa, Petr Evtoukhovitch, Yuya Akazawa, J. Y. Lee, Elena Botta, T. Shiozaki, T. Takahashi, Nobuyuki Chiga, Satoshi Sato, Hitoshi Sugimura, Y. Igarashi, H. Sako, K. Tanabe, S. Hayakawa, Katsuyu Kasami, K. Hosomi, Shunsuke Kanatsuki, H. Tamura, M. Naruki, Koji Miwa, Mifuyu Ukai, Michelangelo Agnello, Seongbae Yang, Shoichi Hasegawa, S. Nagao, R. Honda, Hiroyuki Ekawa, K. Aoki, Tokujiro Yamamoto, A. Feliciello, S. Ishimoto, Takeshi Koike, S. Marcello, and R. Iwasaki

Subjects
Physics, Magnetic moment, Hadron, Hyperon, Elementary particle, Fermion, Nuclear matter, γ ray spectroscopy, Baryon, Nuclear physics, medium effect of hadron, Hypernuclei, Spin-flip, Hypernuclei, γ ray spectroscopy, medium effect of hadron
Published
2015

39. High Statistics $\Sigma p$ Scattering Experiment Using High Intensity Pion Beams at J-PARC

Author

L. Raux, S. H. Hwang, Hitoshi Takahashi, J. L. Kim, Mifuyu Ukai, S. H. Kim, Y. Nakada, Atsushi Sakaguchi, Y. Kondo, M. Ikeda, S. Ishimoto, T. Shiozaki, Masaaki Tanaka, Manami Nakagawa, Takeshi Koike, Y. Ogura, Petr Evtoukhovitch, R. Honda, Shoichi Hasegawa, Manabu Moritsu, Koji Miwa, Kenichi Imai, Hiroyuki Sako, Koji Yoshimura, Shuhei Hayakawa, J. K. Ahn, K. Kobayashi, Kiyoshi Tanida, I. Nakamura, S. Y. Suzuki, K. Shirotori, H. Umetsu, Megumi Naruki, Nobuyuki Chiga, T. N. Takahashi, Y. Sasaki, Susumu Sato, J. W. Lee, K. Hosomi, Z. Tsamalaidze, Hirokazu Tamura, Tokujiro Yamamoto, W. S. Jung, Masaharu Ieiri, C. d. L. Taille, Y. Matsumoto, S. Callier, H. Kanda, T. Takahashi, Hitoshi Sugimura, Yuya Akazawa, T. Hayakawa, Organisation de Micro-Électronique Générale Avancée (OMEGA), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X), and École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Particle physics, Hadron, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, +Sigma+p%22">Sigma p --> Sigma p, hydrogen: liquid: target, Pion, 0103 physical sciences, +Lambda+n%22">Sigma- p --> Lambda n, Hyperon proton scattering, pi: beam, 010306 general physics, Nuclear Experiment, Boson, baryon baryon: interaction, Physics, p hyperon: elastic scattering, 010308 nuclear & particles physics, Scattering, J-PARC Lab, scattering, Fermion, magnetic spectrometer, +K+Sigma%22">pi p --> K Sigma, Pauli principle, statistics, p hyperon: inelastic scattering, $\Sigma$N interaction, J-PARC, Nucleon, Sigma: production
Abstract

International audience; In order to test theoretical frameworks of the baryon–baryon (BB) interactions and to confirm the “Pauli effect between quarks” for the first time, we have proposed an experiment (J-PARC E40) to measure low-energy hyperon–proton scattering cross sections of the Σ^+p, Σ^−p elastic scatterings and the Σ^−p → Λn inelastic scattering in the momentum range of 400 < p (MeV/c) < 700 in the laboratory system. Experimentally, we detect two successive reactions of the Σ production (π^±p → K^+Σ^±) and the Σp scattering (Σp → Σp) in the same liquid hydrogen target. The former is measured with two magnetic spectrometers, and the latter with a scattered proton detector (CATCH). By using a high intensity π beam, we estimate that more than 10,000 scattering events can be identified. In this experiment, we aim to provide good quality scattering data to test the theoretical models of the BB interaction.

Published
2015

40. Study of ΛN Interaction via the γ-ray Spectroscopy of \(_\Lambda ^4\textHe\) and \(_\Lambda ^19\textF\) (E13-1st)

Author

Elena Botta, Taofeng Wang, K. Imai, M. Naruki, J. K. Lee, S. Marcello, S. H. Hwang, Kenji Hosomi, K Tanida, S. Hayakawa, Seongbae Yang, S. Nagao, Satoshi Sato, A. Feliciello, Takeshi Koike, Shunsuke Kanatsuki, Atsushi Sakaguchi, S. Ishimoto, S. Suzuki, Y. Sasaki, Michelangelo Agnello, R. Honda, T. Haruyama, Tomofumi Nagae, Yudai Ichikawa, R. Iwasaki, K. Tanabe, V. Samoilov, Y. Igarashi, Z. Tsamalaidze, N. Chiga, Y. Yamamoto, Petr Evtoukhovitch, N. Amano, K. Miwa, J. Y. Lee, Katsuyu Kasami, Hiroyuki Ekawa, K. Aoki, Hitoshi Sugimura, H. Sako, T. Takahashi, M. Ukai, Manami Nakagawa, Tokujiro Yamamoto, Kotaro Shirotori, T. Shiozaki, Yuya Akazawa, S. Hasegawa, and H. Tamura

Subjects
Physics, Hadron, Nuclear structure, Gamma ray, Elementary particle, Lambda, Hypernucleus, Λ hypernuclei, γ-ray spectroscopy, J-PARC, Λ hypernuclei, Nuclear physics, Crystallography, J-PARC, γ-ray spectroscopy, Gamma spectroscopy, Spectroscopy
Published
2015

41. Study on 6ΛH hypernucleus by the (π-, K+) reaction at J-PARC

Author

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

Subjects
Nuclear physics, Baryon, Physics, Nuclear reaction, Pion, Meson, QC1-999, Hadron, Carbon-12, Nuclear Experiment, Lambda, Hypernucleus
Abstract

We carried out an experiment to produce the neutron-rich hypernucleus H-6(Lambda) via the (pi(-), K+) reaction on Li-6 target at the pion beam momentum of 1.2 GeV/c (J-PARC E10). In order to calibrate the scale of the missing-mass or of the Lambda binding energy of the hypernucleus, we also measured the C-12(pi(+), K+)(12)(Lambda)12, p(pi(-), K+)Sigma(-) and p(pi(+), K+)Sigma(+) reactions. The experiment was performed at the J-PARC Hadron Hall K1.8 beam line in December 2012 and January 2013. The overall collected data sample corresponds to an integrated beam intensity of 1.65 x 10(12) pions

Published
2014

42. High Precision γ-ray Spectroscopy of \(_\Lambda ^4\textHe\) and \(_\Lambda ^19\textF\) at J-PARC

Author

K. Tanida, T. Takahashi, N. Amano, Shoichi Hasegawa, Elena Botta, S. Suzuki, Mifuyu Ukai, S. H. Hwang, Takeshi Koike, J. K. Lee, Hitoshi Sugimura, Manami Nakagawa, Seongbae Yang, K. Tanabe, Kanae Aoki, K. Imai, Y. Sasaki, Hitoshi Takahashi, Y. Igarashi, Yamamoto Takeshi, T. Haruyama, T. Shiozaki, Nobuyuki Chiga, Taofeng Wang, K. Miwa, Yudai Ichikawa, K. Hosomi, V. Samoilov, Shunsuke Kanatsuki, Susumu Sato, R. Honda, Hiroyuki Sako, Hitoshi Tamura, Jihwa Lee, Hiroyuki Ekawa, Z. Tsamalaidze, Y. Yamamoto, Petr Evtoukhovitch, M. Naruki, K. Shirotori, Katsuyu Kasami, Michelangelo Agnello, Yuya Akazawa, A. Feliciello, S. Marcello, Sho Nagao, S. H. Hayakawa, S. Ishimoto, and R. Iwasaki

Subjects
Nuclear physics, Physics, J-PARC, Λ hypernuclei, γ-ray spectroscopy, Hyperball-J, J-PARC, γ-ray spectroscopy, Spectroscopy, Lambda, Λ hypernuclei, Hyperball-J
Published
2014

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