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118 results on '"Itahashi Kenta"'

1. Feasibility of the observation of $\eta^{\prime}$ mesic nuclei in the semi-exclusive $^{12}$C($p, dp$) reaction

Author

Ikeno, Natsumi, Higashi, Yuko, Fujioka, Hiroyuki, Itahashi, Kenta, Sekiya, Ryohei, Tanaka, Yoshiki K., Yamagata-Sekihara, Junko, Metag, Volker, Nanova, Mariana, and Hirenzaki, Satoru

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

We study theoretically the feasibility of the semi-exclusive $^{12}$C($p,dp$)$X$ reaction for the observation of $\eta^\prime$ mesic nuclei using the transport model JAM. The semi-exclusive measurements of the ($p,d$) reaction with protons from $\eta^\prime$ non-mesonic two-body absorption ($\eta^\prime NN \to NN$) are found to be critically important for the observation of the $\eta^\prime$ bound states. The Green's function method is used to calculate the momentum spectrum of forward going deuterons corresponding to the excitation energy spectrum of the $\eta^\prime \otimes {}^{11}$C system in the semi-exclusive measurement. The semi-exclusive measurements are considered to be important in general for the $\eta^\prime$ mesic nucleus formation., Comment: 7 pages, 2 figures, 1 table

Published
2024

2. Summary of the K−pp bound-state observation in E15 and future prospects

Author

Sakuma Fuminori, Ajimura Shuhei, Akaishi Takaya, Asano Hidemitsu, Bazzi Massimiliano, Beer George, Bhang Hyoungchan, Bragadireanu Mario, Buehler Paul, Busso Luigi, Cargnelli Michael, Choi Seonho, Clozza Alberto, Curceanu Catalina, Enomoto Shun, Fujioka Hiroyuki, Fujiwara Yuya, Fukuda Tomokazu, Guaraldo Carlo, Hashimoto Tadashi, Hayano Ryugo S., Hiraiwa Toshihiko, Iio Masami, Iliescu Mihai, Inoue Kentaro, Ishiguro Yosuke, Ishikawa Takashi, Ishimoto Shigeru, Itahashi Kenta, Iwasaki Masahiko, Iwai Masaaki, Kanno Koki, Kato Kazuma, Kato Yuko, Kawasaki Shingo, Kienle Paul, Kou Hiroshi, Ma Yue, Marton Johann, Matsuda Yasuyuki, Miliucci Marco, Mizoi Yutaka, Morra Ombretta, Murayama Rie, Nagae Tomofumi, Noumi Hiroyuki, Ohnishi Hiroaki, Okada Shinji, Outa Haruhiko, Ozawa Kyoichiro, Piscicchia Kristian, Sada Yuta, Sakaguchi Atsushi, Sato Masaharu, Scordo Alessandro, Sekimoto Michiko, Shi Hexi, Shirotori Kotaro, Sirghi Diana, Sirghi Florin, Suzuki Shoji, Suzuki Takatoshi, Tanida Kiyoshi, Tatsuno Hideyuki, Tokuda Makoto, Tomono Dai, Toyoda Akihisa, Tsukada Kyo, Vázquez Doce Oton, Widmann Eberhard, Yamaga Takumi, Yamazaki Toshimitsu, Yoshida Chihiro, Zhang Qi, and Zmeskal Johann

Subjects
Physics, QC1-999
Abstract

The possible existence of deeply-bound $\bar K$K¯-nuclear bound states, kaonic nuclei, has been widely discussed as products of the strongly attractive $\bar K$K¯N interaction in I = 0 channels. Investigations of those exotic states will provide us unique information of the $\bar K$K¯N interaction below the threshold, which is still not fully understood so far. Recently, we observed the simplest kaonic nuclei, $\bar K$K¯NN, having a much deeper binding energy than normal nuclei via inflight (K−, N) reactions at the J-PARC E15 experiment. For further studies, we have proposed a series of experimental programs for the systematic investigation of light kaonic nuclei, from $\bar K$K¯N (Λ(1405)) to $\bar K$K¯NNNN. We will measure the $\bar K$K¯NNN (A = 3) system at the new experiment approved as J-PARC E80, as a first step toward a comprehensive study.

Published
2022
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3. Comparison of 3ΛH/4ΛH production cross-section via (K−, π0) reaction at J-PARC

Author

Akaishi Takaya, Asano Hidemitsu, Chen Xurong, Clozza Alberto, Curceanu Catalina, Del Grande Raffaele, Guaraldo Carlo, Han Chengdong, Hashimoto Tadashi, Iliescu Mihai, Inoue Kentaro, Ishimoto Shigeru, Itahashi Kenta, Iwasaki Masahiko, Ma Yue, Murayama Rie, Miliucci Marco, Noumi Hiroyuki, Ohnishi Hiroyuki, Okada Shinji, Outa Haruhiko, Piscicchia Kristian, Sada Yuta, Sakaguchi Atsushi, Sakuma Fuminori, Sato Masaharu, Scordo Alessandro, Sirghi Diana, Sirghi Florin, Shirotori Kotaro, Suzuki Shoji, Tanida Kiyoshi, Toda Taiga, Tokuda Megumu, Tsuruta Masato, Yamaga Takumi, Yuan Xiaohua, Zhang Hongqiang, Zhang Pengming, and Zhang Yapeng

Subjects
Physics, QC1-999
Abstract

Recent heavy-ion collision experiments reported a surprisingly short lifetime for the hypertriton, which has been recognized as the hypertriton lifetime puzzle. Our J-PARC E73 experiment contributes to solve this puzzle with an independent experimental method by employing 3He(K−, π0) 3ΛH reaction. In this contribution, we will demonstrate our capability to provide 3ΛH binding energy information by deriving the production cross section ratio, σ3ΛH/σ4ΛH. The production cross section data for 3ΛH and 4ΛH are already available as the pilot run of E73 experiment and data analysis is in progress.

Published
2022
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4. Pion-nucleon sigma term $\sigma_{\pi N}$ and deeply bound pionic atoms

Author

Ikeno, Natsumi, Nishi, Takahiro, Itahashi, Kenta, Nose-Togawa, Naoko, Tani, Akari, and Hirenzaki, Satoru

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

We investigate the possibility to determine the value of the pion-nucleon sigma term $\sigma_{\pi N}$ precisely by the experimental observables of the deeply bound pionic atoms. We discuss the sensitivity of the observables to $\sigma_{\pi N}$ and take into account the typical errors of the up-to-date experiments of the deeply bound pionic atoms. We find that the gap of the binding energies and the width of the deeply bound pionic states are good observables for the $\sigma_{\pi N}$ value determination by the experimental data. We also discuss the expected difficulties for the accurate determination of the value of $\sigma_{\pi N}$ due to the correlation between the $\sigma$ term and the potential parameter in the pion-nucleus optical potential., Comment: 14 pages, 8 figures, 3 tables, v2: title changed, discussions on parameter correlations added, updates of some numerical results and figures

Published
2022

5. Chiral symmetry restoration at high matter density observed in pionic atoms

Author

Nishi, Takahiro, Itahashi, Kenta, Ahn, DeukSoon, Berg, Georg P. A., Dozono, Masanori, Etoh, Daijiro, Fujioka, Hiroyuki, Fukuda, Naoki, Fukunishi, Nobuhisa, Geissel, Hans, Haettner, Emma, Hashimoto, Tadashi, Hayano, Ryugo S., Hirenzaki, Satoru, Horii, Hiroshi, Ikeno, Natsumi, Inabe, Naoto, Iwasaki, Masahiko, Kameda, Daisuke, Kisamori, Keichi, Kiyokawa, Yu, Kubo, Toshiyuki, Kusaka, Kensuke, Matsushita, Masafumi, Michimasa, Shin'ichiro, Mishima, Go, Miya, Hiroyuki, Murai, Daichi, Nagahiro, Hideko, Niikura, Megumi, Nose-Togawa, Naoko, Ota, Shinsuke, Sakamoto, Naruhiko, Sekiguchi, Kimiko, Shiokawa, Yuta, Suzuki, Hiroshi, Suzuki, Ken, Takaki, Motonobu, Takeda, Hiroyuki, Tanaka, Yoshiki K., Uesaka, Tomohiro, Wada, Yasumori, Watanabe, Atomu, Watanabe, Yuni N., Weick, Helmut, Yamakami, Hiroki, Yanagisawa, Yoshiyuki, and Yoshida, Koichi

Subjects
Nuclear Experiment, High Energy Physics - Phenomenology, Nuclear Theory
Abstract

Modern theories of physics tell that the vacuum is not an empty space. Hidden in the vacuum is a structure of anti-quarks $\bar{q}$ and quarks $q$. The $\bar{q}$ and $q$ pair has the same quantum number as the vacuum and condensates in it since the strong interaction of the quantum chromodynamics (QCD) is too strong to leave it empty. The $\bar{q}q$ condensation breaks the chiral symmetry of the vacuum. The expectation value $<\bar{q}q>$ is an order parameter. For higher temperature or higher matter-density, $|<\bar{q}q>|$ decreases reflecting the restoration of the symmetry. In contrast to these clear-cut arguments, experimental evidence is so far limited. First of all, the $\bar{q}q$ is nothing but the vacuum itself. It is neither visible nor perceptible. In this article, we unravel this invisible existence by high precision measurement of pionic atoms, $\pi^-$-meson-nucleus bound systems. Using the $\pi^-$ as a probe, we demonstrate that $|<\bar{q}q>|$ is reduced in the nucleus at 58% of the normal nuclear density by a factor of 77 $\pm$ 2% compared with that in the vacuum. This reduction indicates that the chiral symmetry is partially restored due to the extremely high density of the nucleus. The present experimental result clearly exhibits the existence of the hidden structure, the chiral condensate, in the vacuum.

Published
2022
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6. Search for η′ mesic nuclei by missing-mass spectroscopy of the 12C(p,d) reaction

Author

Tanaka Yoshiki K., Ayyad Yassid, Benlliure Jose, Brinkmann Kai-Thomas, Friedrich Stefan, Fujioka Hiroyuki, Geissel Hans, Gellanki Jnaneswari, Guo Chenlei, Gutz Eric, Haettner Emma, Harakeh Muhsin N., Hayano Ryugo S., Higashi Yuko, Hirenzaki Satoru, Hornung Christine, Igarashi Yoichi, Ikeno Natsumi, Itahashi Kenta, Iwasaki Masahiko, Jido Daisuke, Kalantar-Nayestanaki Nasser, Kanungo Rituparna, Knoebel Ronja, Kurz Nikolaus, Metag Volker, Mukha Ivan, Nagae Tomofumi, Nagahiro Hideko, Nanova Mariana, Nishi Takahiro, Ong Hooi Jin, Pietri Stephane, Prochazka Andrej, Rappold Christophe, Reiter Moritz P., Rodríguez Sánchez Jose Luis, Scheidenberger Christoph, Simon Haik, Sitar Branislav, Strmen Peter, Sun Baohua, Suzuki Ken, Szarka Imrich, Takechi Maya, Tanihata Isao, Terashima Satoru, Watanabe Yuni N., Weick Helmut, Widmann Eberhard, Winfield John S., Xu Xiaodong, Yamakami Hiroki, and Zhao Jianwei

Subjects
Physics, QC1-999
Abstract

We performed a missing-mass spectroscopy experiment of the 12C(p, d) reaction at 2.5 GeV proton energy in order to search for η′ mesic nuclei. An excitation-energy spectrum of 11C was obtained around the η′ production threshold. As no significant peak structure was observed in the spectrum, upper limits of the formation cross section of η′ mesic nuclei have been determined. Preliminary results of the experiment as well as future prospects are given.

Published
2016
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7. Precision spectroscopy of pionic atoms and chiral symmetry in nuclei

Author

Itahashi Kenta, Ahn DeukSoon, Berg Georg P.A., Dozono Masanori, Etoh Daijiro, Fujioka Hiroyuki, Fukuda Naoki, Fukunishi Nobuhisa, Geissel Hans, Haettner Emma, Hashimoto Tadashi, Hayano Ryugo S., Hirenzaki Satoru, Horii Hiroshi, Ikeno Natsumi, Inabe Naoto, Iwasaki Masahiko, Kameda Daisuke, Kawase Shouichiro, Kisamori Keiichi, Kiyokawa Yu, Kubo Toshiyuki, Kusaka Kensuke, Matsushita Masafumi, Michimasa Shin’ichiro, Mishima Go, Miya Hiroyuki, Murai Daichi, Nagahiro Hideko, Nishi Takahiro, Ota Shinsuke, Sakamoto Naruhiko, Sekiguchi Kimiko, Suzuki Hiroshi, Suzuki Ken, Takaki Motonobu, Takeda Hiroyuki, Tanaka Yoshiki K., Uesaka Tomohiro, Wada Yasumori, Watanabe Yuni N., Weick Helmut, Yamakami Hiroki, Yanagisawa Yoshiyuki, and Yoshida Koichi

Subjects
Physics, QC1-999
Abstract

We conduct an experimental project to make spectroscopy of deeply bound pionic atoms systematically over wide range of nuclei. We aim at studying the strong interaction in the low energy region, which has close connection to spontaneous chiral symmetry breaking and its partial restoration in nuclear matter. First experimental results show improved spectral resolution and much better statistical sensitivity than previous experiments. Present status of the experiment is reported.

Published
2016
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8. Spectroscopy of η′ Mesic Nuclei via Semi-Exclusive Measurement at FAIR

Author

Fujioka Hiroyuki, Brinkmann Kai-Thomas, Friedrich Stefan, Geissel Hans, Hayano Ryugo S., Hirenzaki Satoru, Itahashi Kenta, Itoh Satoshi, Jido Daisuke, Metag Volker, Nagahiro Hideko, Nanova Mariana, Nishi Takahiro, Okochi Kota, Outa Haruhiko, Suzuki Ken, Suzuki Takatoshi, Tanaka Yoshiki K., Watanabe Yuni N., and Weick Helmut

Subjects
Physics, QC1-999
Abstract

In order to investigate a possible mass reduction of an η′ meson at finite density, a series of missing-mass spectroscopy experiments of η′-nucleus bound states with the 12C(p,d) reaction is planned at GSI and FAIR. A semi-exclusive measurement with the tagging of protons from η′ two-body absorption (η′NN → NN) will be a key feature in an experiment with Super-FRS at FAIR.

Published
2014
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9. The first precision measurement of deeply bound pionic states in 121Sn

Author

Nishi Takahiro, Berg Georg P. A., Dozono Masanori, Fujioka Hiroyuki, Fukuda Naoki, Furuno Tatsuya, Geissel Hans, Hayano Ryugo S., Inabe Naoto, Itahashi Kenta, Itoh Satoshi, Kameda Daisuke, Kubo Toshiyuki, Matsubara Hiroaki, Michimasa Shin’ichiro, Miki Kenjiro, Miya Hiroyuki, Murakami Yohei, Nakamura Masaki, Nakatsuka Noritsugu, Noji Shumpei, Okochi Kota, Ota Shinsuke, Suzuki Hiroshi, Suzuki Ken, Takaki Motonobu, Takeda Hiroyuki, Tanaka Yoshiki K., Todoroki Koichi, Tsukada Kyo, Uesaka Tomohiro, Watanabe Yuni N., Weick Helmut, Yamada Hiroyuki, and Yoshida Koichi

Subjects
Physics, QC1-999
Abstract

We performed a precision missing-mass spectroscopy experiment of the deeply bound pionic states in a 121Sn atom using the (d,3He) reaction near the π− emission threshold. The experiment serves as a pilot experiment for our new ‘pionic atom factory project’ at RIBF, which aims at precision spectroscopy of the energy spectrum of the pionic atom of isotopes and isotones. The result of the pilot experiment demonstrated the potentiality of BigRIPS and of the RIBF facilities for the project. The current status of the analysis is reported.

Published
2014
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10. Missing Mass Spectroscopy of η′ Mesic Nuclei with the (p,d) Reaction at GSI

Author

Tanaka Yoshiki K., Brinkmann Kai-Thomas, Friedrich Stefan, Fujioka Hiroyuki, Geissel Hans, Hayano Ryugo S., Hirenzaki Satoru, Itahashi Kenta, Itoh Satoshi, Jido Daisuke, Metag Volker, Nagahiro Hideko, Nanova Mariana, Nishi Takahiro, Okochi Kota, Outa Haruhiko, Suzuki Ken, Suzuki Takatoshi, Watanabe Yuni N., and Weick Helmut

Subjects
Physics, QC1-999
Abstract

We plan a missing-mass spectroscopy experiment of η′ mesic nuclei with the 12C(p,d)η′⊗11C reaction to study in-medium properties of the η′ meson. In nuclear medium, due to restoration of chiral symmetry, the mass of the η′ meson may be reduced, and η′ bound states in a nucleus may exist. The experiment will be started at GSI with a 2.5 GeV proton beam using FRS as a spectrometer and will be continued at Super-FRS at FAIR. The plan of the experiment and development of a Cherenkov detector and an optics mode are described.

Published
2014
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11. Structure of double pionic atoms

Author

Tani, Akari, Ikeno, Natsumi, Jido, Daisuke, Nagahiro, Hideko, Fujioka, Hiroyuki, Itahashi, Kenta, and Hirenzaki, Satoru

Subjects
Nuclear Theory
Abstract

We study theoretically the structure of double pionic atoms, in which two negatively charged pions ($\pi^-$) are bound in the atomic orbits. The double pionic atom is considered to be an interesting system from the point of view of the multi bosonic systems. In addition, it could be possible to deduce valuable information on the isospin $I = 2$ $\pi\pi$ interaction and the pion-nucleus strong interaction. In this paper, we take into account the $\pi\pi$ strong and electromagnetic interactions, and evaluate the effects on the binding energies by perturbation theory for the double pionic atoms in heavy nuclei. We investigate several combinations of two pionic states and find that the order of magnitude of the energy shifts due to the $\pi\pi$ interaction is around 10 keV for the strong interaction and around 100 keV for the electromagnetic interaction for the ground states., Comment: 16 pages, 6 figures, 5 tables

Published
2020
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13. Spectroscopy of η′-nucleus bound states at GSI-SIS

Author

Outa Haruhiko, Okochi Kota, Nishi Takahiro, Nanova Mariana, Nagahiro Hideko, Metag Volker, Jido Daisuke, Itoh Satoshi, Hirenzaki Satoru, Hayano Ryugo S., Geissel Hans, Itahashi Kenta, Fujioka Hiroyuki, Suzuki Ken, Suzuki Takatoshi, Tanaka Yoshiki K., and Weick Helmut

Subjects
Physics, QC1-999
Abstract

The η′ meson mass may be reduced due to partial restoration of chiral symmetry. If this is the case, an η′-nucleus system may form a nuclear bound state.We plan to carry out a missing-mass spectroscopy experiment with the 12C(p,d) reaction at GSI-SIS. Peak structures corresponding to such a bound state may be observed even in an inclusive measurement, if the decay width is narrow enough.

Published
2012
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14. First pionic atom spectroscopy at RIBF

Author

Ota Shinsuke, Noji Shumpei, Nishi Takahiro, Nakamura Masaki, Miya Hiroyuki, Miki Kenjiro, Michimasa Shinichiro, Matsubara Hiroaki, Kubo Toshiyuki, Kameda Daisuke, Itoh Satoshi, Inabe Naohito, Ikeno Natsumi, Hirenzaki Satoru, Hayano Ryugo S., Geissel Hans, Fujioka Hiroyuki, Berg Georg P.A., Itahashi Kenta, Suzuki Ken, Takeda Hiroyuki, Todoroki Koichi, Tsukada Kyo, Uesaka Tomohiro, Weick Helmut, and Yoshida Koichi

Subjects
Physics, QC1-999
Abstract

We have performed an inclusive spectroscopy of 122Sn(d, 3He) reaction near the pion emission threshold at an incident energy of Td = 250 MeV/nucleon. The first experiment aims as devloping the high precision spectroscopy of pionic atoms at the RI beam factory (RIBF) of RIKEN, which leads to a new project, pionic Atom Factory project (piAF) to measure pionic atoms for a wide range of elements. We report the analysis status of the pilot experiment.

Published
2012
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15. Extension of the J-PARC Hadron Experimental Facility - summary report -

Author

Fujioka, Hiroyuki, Hicks, Kenneth, Igarashi, Yoichi, Itahashi, Kenta, Komatsubara, Takeshi K., Miwa, Kouji, Nagae, Tomofumi, Nakamura, Satoshi N., Nanjo, Hajime, Noumi, Hiroyuki, Ohnishi, Hiroaki, Okada, Shinji, Sakaguchi, Atsushi, Sawada, Shinya, Shimizu, Suguru, Shirotori, Kotaro, Takahashi, Hitoshi, Takahashi, Toshiyuki, Tamura, Hirokazu, Tanida, Kiyoshi, and Ukai, Mifuyu

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

The committee for the study of the extension of the Hadron Experimental Facility was formed under the Hadron Hall Users' Association in August, 2015. This document is a summary of the discussions among the committee members, and documented by a part of the members listed below., Comment: 22 pages, 2 figures, Hadron Users' Association Home Page: http://www.rcnp.osaka-u.ac.jp/~jparchua/en/index.html

Published
2017

17. Search for Tetraneutron by Pion Double Charge Exchange Reaction at J-PARC

Author

Fujioka, Hiroyuki, Fukuda, Tomokazu, Harada, Toru, Hiyama, Emiko, Itahashi, Kenta, Kanatsuki, Shunsuke, Nagae, Tomofumi, Nanamura, Takuya, and Nishi, Takahiro

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Tetraneutron ($^4n$) has come back in the limelight, because of recent observation of a candidate resonant state at RIBF. We propose to investigate the pion double charge exchange (DCX) reaction, i.e. $^4\mathrm{He}({\pi}^- , {\pi}^+)$, as an alternative way to populate tetraneutron. An intense ${\pi}^-$ beam with the kinetic energy of ~850 MeV, much higher than that in past experiments at LAMPF and TRIUMF, will open up a possibility to improve the experimental sensitivity of the formation cross section, which will be much smaller than hitherto known DCX cross sections such as $^9\mathrm{Be}({\pi}^-, {\pi}^+)^9\mathrm{He}\ (g.s.)$., Comment: 4 pages, 1 figure; proceedings of the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016), Kyoto, Japan, 25-30 July 2016

Published
2016
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18. Search for the deeply bound $K^-pp$ state from the semi-inclusive forward-neutron spectrum in the in-flight $K^-$ reaction on helium-3

Author

Hashimoto, Tadashi, Ajimura, Shuhei, Beer, George, Bhang, Hyoungchan, Bragadireanu, Mario, Busso, Luigi, Cargnelli, Michael, Choi, Seonho, Curceanu, Catalina, Enomoto, Shun, Faso, Diego, Fujioka, Hiroyuki, Fujiwara, Yuya, Fukuda, Tomokazu, Guaraldo, Carlo, Hayano, Ryugo S., Hiraiwa, Toshihiko, Iio, Masami, Iliescu, Mihai, Inoue, Kentaro, Ishiguro, Yosuke, Ishikawa, Takashi, Ishimoto, Shigeru, Itahashi, Kenta, Iwai, Masaaki, Iwasaki, Masahiko, Kato, Yuko, Kawasaki, Shingo, Kienle, Paul, Kou, Hiroshi, Ma, Yue, Marton, Johann, Matsuda, Yasuyuki, Mizoi, Yutaka, Morra, Ombretta, Nagae, Tomofumi, Noumi, Hiroyuki, Ohnishi, Hiroaki, Okada, Shinji, Outa, Haruhiko, Piscicchia, Kristian, Lener, Marco Poli, Vidal, Antonio Romero, Sada, Yuta, Sakaguchi, Atsushi, Sakuma, Fuminori, Sato, Masaharu, Scordo, Alessandro, Sekimoto, Michiko, Shi, Hexi, Sirghi, Diana, Sirghi, Florin, Suzuki, Shoji, Suzuki, Takatoshi, Tanida, Kiyoshi, Tatsuno, Hideyuki, Tokuda, Makoto, Tomono, Dai, Toyoda, Akihisa, Tsukada, Kyo, Doce, Oton Vazquez, Widmann, Eberhard, Yamaga, Takumi, Yamazaki, Toshimitsu, Yim, Heejoong, Zhang, Qi, and Zmeskal, Johann

Subjects
Nuclear Experiment
Abstract

An experiment to search for the $K^-pp$ bound state was performed via the in-flight $^3$He($K^-,n)$ reaction using 5.3 $\times$ $10^9$ kaons at 1 GeV/$c$ at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at $\theta_{n}^{lab}=0^\circ$, no significant peak was observed in the region corresponding to $K^-pp$ binding energy larger than 80 MeV, where a bump structure has been reported in the $\Lambda p$ final state in different reactions. Assuming the state to be isotropically decaying into $\Lambda p$, mass-dependent upper limits on the production cross section were determined to be 30--180, 70--250, and 100--270 $\mu$b/sr, for the natural widths of 20, 60, and 100 MeV, respectively, at 95\% confidence level., Comment: 12 pages, 6 figures

Published
2014
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19. Spectroscopy of eta' mesic nuclei with (p,d) reaction

Author

Tanaka, Yoshiki K., Friedrich, Stefan, Fujioka, Hiroyuki, Geissel, Hans, Hayano, Ryugo S., Hirenzaki, Satoru, Itahashi, Kenta, Itoh, Satoshi, Jido, Daisuke, Metag, Volker, Nagahiro, Hideko, Nanova, Mariana, Nishi, Takahiro, Okochi, Kota, Outa, Haruhiko, Suzuki, Ken, Suzuki, Takatoshi, and Weick, Helmut

Subjects
Nuclear Experiment
Abstract

We are going to perform an inclusive spectroscopy experiment of eta' mesic nuclei with the 12C(p,d) reaction to study in-medium properties of the eta' meson. In nuclear medium, the eta' meson mass may be reduced due to partial restoration of chiral symmetry. In case of sufficiently large mass reduction and small absorption width of eta' at normal nuclear density, peak structures of eta' mesic states in 11C will be observed near the eta' emission threshold even in an inclusive spectrum. The experiment will be carried out at GSI with proton beam supplied by SIS using FRS as a spectrometer. The detail of the experiment is described., Comment: 4 pages, 2 figures, to appear in the proceedings of FB20 (20th International IUPAP Conference on Few-Body Problems in Physics), 20-25 August 2012, Fukuoka, Japan

Published
2012
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20. The K1.8BR spectrometer system at J-PARC

Author

Agari, Keizo, Ajimura, Shuhei, Beer, George, Bhang, Hyoungchan, Bragadireanu, Mario, Buehler, Paul, Busso, Luigi, Cargnelli, Michael, Choi, Seonho, Curceanu, Catalina, Enomoto, Shun, Faso, Diego, Fujioka, Hiroyuki, Fujiwara, Yuya, Fukuda, Tomokazu, Guaraldo, Carlo, Hashimoto, Tadashi, Hayano, Ryugo S., Hiraiwa, Toshihiko, Hirose, Erina, Ieiri, Masaharu, Iio, Masami, Iliescu, Mihai, Inoue, Kentaro, Ishiguro, Yosuke, Ishikawa, Takashi, Ishimoto, Shigeru, Ishiwatari, Tomoichi, Itahashi, Kenta, Iwai, Masaaki, Iwasaki, Masahiko, Kakiguchi, Yutaka, Katoh, Yohji, Kawasaki, Shingo, Kienle, Paul, Kou, Hiroshi, Ma, Yue, Marton, Johann, Matsuda, Yasuyuki, Minakawa, Michifumi, Mizoi, Yutaka, Morra, Ombretta, Muto, Ryotaro, Nagae, Tomofumi, Naruki, Megumi, Noumi, Hiroyuki, Ohnishi, Hiroaki, Okada, Shinji, Outa, Haruhiko, Piscicchia, Kristian, Lener, Marco Poli, Vidal, Antonio Romero, Sada, Yuta, Sakaguchi, Atsushi, Sakuma, Fuminori, Sato, Masaharu, Sato, Yoshinori, Sawada, Shin'ya, Scordo, Alessandro, Sekimoto, Michiko, Shi, Hexi, Shirakabe, Yoshihisa, Sirghi, Diana, Sirghi, Florin, Suzuki, Ken, Suzuki, Shoji, Suzuki, Takatoshi, Suzuki, Yoshihiro, Takahashi, Hitoshi, Tanaka, Kazuhiro, Tanaka, Nobuaki, Tatsuno, Hideyuki, Tokuda, Makoto, Toyoda, Akihisa, Tomono, Dai, Tsukada, Kyo, Doce, Oton Vazquez, Watanabe, Hiroaki, Widmann, Eberhard, Wunschek, Barbara K., Yamanoi, Yutaka, Yamazaki, Toshimitsu, Yim, Heejoong, and Zmeskal, Johann

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

A new spectrometer system was designed and constructed at the secondary beam line K1.8BR in the hadron hall of J-PARC to investigate $\bar K N$ interactions and $\bar K$-nuclear bound systems. The spectrometer consists of a high precision beam line spectrometer, a liquid $^3$He/$^4$He/D$_2$ target system, a Cylindrical Detector System that surrounds the target to detect the decay particles from the target region, and a neutron time-of-flight counter array located $\sim$15 m downstream from the target position. Details of the design, construction, and performance of the detector components are described., Comment: 33 pages, 25 figures

Published
2012
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21. Feasibility Study of Observing eta' Mesic Nuclei with (p,d) Reaction

Author

Itahashi, Kenta, Fujioka, Hiroyuki, Geissel, Hans, Hayano, Ryugo S., Hirenzaki, Satoru, Itoh, Satoshi, Jido, Daisuke, Metag, Volker, Nagahiro, Hideko, Nanova, Mariana, Nishi, Takahiro, Okochi, Kota, Outa, Haruhiko, Suzuki, Ken, Tanaka, Yoshiki K., and Weick, Helmut

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

A novel method is proposed to measure eta'(958) meson bound states in 11C nuclei by missing mass spectroscopy of the 12C(p,d) reaction near the eta' production threshold. It is shown that peak structures will be observed experimentally in an inclusive measurement in case that the in-medium eta' mass reduction is sufficiently large and that the decay width of eta' mesic states is narrow enough. Such a measurement will be feasible with the intense proton beam supplied by the SIS synchrotron at GSI combined with the good energy resolution of the fragment separator FRS., Comment: 12 pages, 6 figures, accepted for publication in Progress of Theoretical Physics

Published
2012
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22. Precision Spectroscopy of Deeply Bound Pionic Atoms and Partial Restoration of Chiral Symmetry in Medium

Author

Ikeno, Natsumi, Kimura, Rie, Yamagata-Sekihara, Junko, Nagahiro, Hideko, Jido, Daisuke, Itahashi, Kenta, Geng, Li Sheng, and Hirenzaki, Satoru

Subjects
Nuclear Theory
Abstract

We study theoretically the formation spectra of deeply bound pionic atoms expected to be observed by experiments with high energy resolution at RIBF/RIKEN, and we discuss in detail the possibilities to extract new information on the pion properties at finite density from the observed spectra, which may provide information on partial restoration of chiral symmetry in medium. We find that the non-yrast pionic states such as 2s are expected to be seen in the (d,3He) spectra, which will be helpful to reduce uncertainties of the theoretical calculations in the neutron wave functions in nucleus. The observation of the 2s state with the ground 1s state is also helpful to reduce the experimental uncertainties associated in the calibration of the absolute excitation energy. We find that the nuclear densities probed by atomic pions are quite stable and almost constant for various atomic states and various nuclei. Effects of the pion wave function renormalization to the formation spectra are also evaluated., Comment: 10 tables, 12 figures, 27 pages

Published
2011
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23. Measurement of Pionic 121Sn atoms at the RI beam factory

Author

Itahashi, Kenta, Berg, Georg P. A., Fujioka, Hiroyuki, Geissel, Hans, Hayano, Ryugo S., Hirenzaki, Satoru, Ikeno, Natsumi, Inabe, Naohito, Itoh, Satoshi, Kameda, Daisuke, Kubo, Toshiyuki, Matsubara, Hiroaki, Michimasa, Shinichiro, Miki, Kenjiro, Miya, Hiroyuki, Nakamura, Masaki, Nishi, Takahiro, Noji, Shumpei, Ota, Shinsuke, Suzuki, Ken, Takeda, Hiroyuki, Todoroki, Koichi, Tsukada, Kyo, Uesaka, Tomohiro, Weick, Helmut, Yoshida, Koichi, Bühler, Paul, editor, Hartmann, Olaf, editor, Marton, Johann, editor, Suzuki, Ken, editor, Widmann, Eberhard, editor, and Zmeskal, Johann, editor

Published
2012
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25. Pionic atom unveils hidden structure of QCD vacuum

Author

Nishi, Takahiro, Itahashi, Kenta, Ahn, DeukSoon, Berg, Georg P. A., Dozono, Masanori, Etoh, Daijiro, Fujioka, Hiroyuki, Fukuda, Naoki, Fukunishi, Nobuhisa, Geissel, Hans, Haettner, Emma, Hashimoto, Tadashi, Hayano, Ryugo S., Hirenzaki, Satoru, Horii, Hiroshi, Ikeno, Natsumi, Inabe, Naoto, Iwasaki, Masahiko, Kameda, Daisuke, Kisamori, Keichi, Kiyokawa, Yu, Kubo, Toshiyuki, Kusaka, Kensuke, Matsushita, Masafumi, Michimasa, Shin'ichiro, Mishima, Go, Miya, Hiroyuki, Murai, Daichi, Nagahiro, Hideko, Niikura, Megumi, Nose-Togawa, Naoko, Ota, Shinsuke, Sakamoto, Naruhiko, Sekiguchi, Kimiko, Shiokawa, Yuta, Suzuki, Hiroshi, Suzuki, Ken, Takaki, Motonobu, Takeda, Hiroyuki, Tanaka, Yoshiki K., Uesaka, Tomohiro, Wada, Yasumori, Watanabe, Atomu, Watanabe, Yuni N., Weick, Helmut, Yamakami, Hiroki, Yanagisawa, Yoshiyuki, Yoshida, Koichi, Nishi, Takahiro, Itahashi, Kenta, Ahn, DeukSoon, Berg, Georg P. A., Dozono, Masanori, Etoh, Daijiro, Fujioka, Hiroyuki, Fukuda, Naoki, Fukunishi, Nobuhisa, Geissel, Hans, Haettner, Emma, Hashimoto, Tadashi, Hayano, Ryugo S., Hirenzaki, Satoru, Horii, Hiroshi, Ikeno, Natsumi, Inabe, Naoto, Iwasaki, Masahiko, Kameda, Daisuke, Kisamori, Keichi, Kiyokawa, Yu, Kubo, Toshiyuki, Kusaka, Kensuke, Matsushita, Masafumi, Michimasa, Shin'ichiro, Mishima, Go, Miya, Hiroyuki, Murai, Daichi, Nagahiro, Hideko, Niikura, Megumi, Nose-Togawa, Naoko, Ota, Shinsuke, Sakamoto, Naruhiko, Sekiguchi, Kimiko, Shiokawa, Yuta, Suzuki, Hiroshi, Suzuki, Ken, Takaki, Motonobu, Takeda, Hiroyuki, Tanaka, Yoshiki K., Uesaka, Tomohiro, Wada, Yasumori, Watanabe, Atomu, Watanabe, Yuni N., Weick, Helmut, Yamakami, Hiroki, Yanagisawa, Yoshiyuki, and Yoshida, Koichi

Abstract

Modern theories of physics tell that the vacuum is not an empty space. Hidden in the vacuum is a structure of anti-quarks $\bar{q}$ and quarks $q$. The $\bar{q}$ and $q$ pair has the same quantum number as the vacuum and condensates in it since the strong interaction of the quantum chromodynamics (QCD) is too strong to leave it empty. The $\bar{q}q$ condensation breaks the chiral symmetry of the vacuum. The expectation value $<\bar{q}q>$ is an order parameter. For higher temperature or higher matter-density, $|<\bar{q}q>|$ decreases reflecting the restoration of the symmetry. In contrast to these clear-cut arguments, experimental evidence is so far limited. First of all, the $\bar{q}q$ is nothing but the vacuum itself. It is neither visible nor perceptible. In this article, we unravel this invisible existence by high precision measurement of pionic atoms, $\pi^-$-meson-nucleus bound systems. Using the $\pi^-$ as a probe, we demonstrate that $|<\bar{q}q>|$ is reduced in the nucleus by a factor of 58 $\pm$ 4% compared with that in the vacuum. This reduction indicates that the chiral symmetry is partially restored due to the extremely high density of the nucleus. The present experimental result clearly exhibits the existence of the hidden structure, the chiral condensate, in the vacuum.

Published
2022

26. Pion-nucleon sigma term $σ_{πN}$ and deeply bound pionic atoms

Author

Ikeno, Natsumi, Nishi, Takahiro, Itahashi, Kenta, Nose-Togawa, Naoko, Tani, Akari, and Hirenzaki, Satoru

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, FOS: Physical sciences, Physics::Atomic Physics, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We investigate the possibility to determine the value of the pion-nucleon sigma term $σ_{πN}$ precisely by the experimental observables of the deeply bound pionic atoms. We discuss the sensitivity of the observables to $σ_{πN}$ and take into account the typical errors of the up-to-date experiments of the deeply bound pionic atoms. We find that the gap of the binding energies and the width of the deeply bound pionic states are good observables for the $σ_{πN}$ value determination by the experimental data. We also discuss the expected difficulties for the accurate determination of the value of $σ_{πN}$ due to the correlation between the $σ$ term and the potential parameter in the pion-nucleus optical potential., 14 pages, 8 figures, 3 tables, v2: title changed, discussions on parameter correlations added, updates of some numerical results and figures

Published
2022
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27. Summary of theK−ppbound-state observation in E15 and future prospects

Author

Sakuma, Fuminori, primary, Ajimura, Shuhei, additional, Akaishi, Takaya, additional, Asano, Hidemitsu, additional, Bazzi, Massimiliano, additional, Beer, George, additional, Bhang, Hyoungchan, additional, Bragadireanu, Mario, additional, Buehler, Paul, additional, Busso, Luigi, additional, Cargnelli, Michael, additional, Choi, Seonho, additional, Clozza, Alberto, additional, Curceanu, Catalina, additional, Enomoto, Shun, additional, Fujioka, Hiroyuki, additional, Fujiwara, Yuya, additional, Fukuda, Tomokazu, additional, Guaraldo, Carlo, additional, Hashimoto, Tadashi, additional, Hayano, Ryugo S., additional, Hiraiwa, Toshihiko, additional, Iio, Masami, additional, Iliescu, Mihai, additional, Inoue, Kentaro, additional, Ishiguro, Yosuke, additional, Ishikawa, Takashi, additional, Ishimoto, Shigeru, additional, Itahashi, Kenta, additional, Iwasaki, Masahiko, additional, Iwai, Masaaki, additional, Kanno, Koki, additional, Kato, Kazuma, additional, Kato, Yuko, additional, Kawasaki, Shingo, additional, Kienle, Paul, additional, Kou, Hiroshi, additional, Ma, Yue, additional, Marton, Johann, additional, Matsuda, Yasuyuki, additional, Miliucci, Marco, additional, Mizoi, Yutaka, additional, Morra, Ombretta, additional, Murayama, Rie, additional, Nagae, Tomofumi, additional, Noumi, Hiroyuki, additional, Ohnishi, Hiroaki, additional, Okada, Shinji, additional, Outa, Haruhiko, additional, Ozawa, Kyoichiro, additional, Piscicchia, Kristian, additional, Sada, Yuta, additional, Sakaguchi, Atsushi, additional, Sato, Masaharu, additional, Scordo, Alessandro, additional, Sekimoto, Michiko, additional, Shi, Hexi, additional, Shirotori, Kotaro, additional, Sirghi, Diana, additional, Sirghi, Florin, additional, Suzuki, Shoji, additional, Suzuki, Takatoshi, additional, Tanida, Kiyoshi, additional, Tatsuno, Hideyuki, additional, Tokuda, Makoto, additional, Tomono, Dai, additional, Toyoda, Akihisa, additional, Tsukada, Kyo, additional, Vázquez Doce, Oton, additional, Widmann, Eberhard, additional, Yamaga, Takumi, additional, Yamazaki, Toshimitsu, additional, Yoshida, Chihiro, additional, Zhang, Qi, additional, and Zmeskal, Johann, additional

Published
2022
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28. Pion–nucleon sigma term σπN and deeply bound pionic atoms.

Author

Ikeno, Natsumi, Nishi, Takahiro, Itahashi, Kenta, Nose-Togawa, Naoko, Tani, Akari, and Hirenzaki, Satoru

Subjects
ATOMS, BINDING energy
Abstract

We investigate the possibility of determining the value of the pion–nucleon sigma term σπ N precisely by the experimental observables of deeply bound pionic atoms. We discuss the sensitivity of the observables to σπ N and take into account the typical errors of up-to-date experiments on deeply bound pionic atoms. We find that the gap in the binding energies and the width of the deeply bound pionic states are good observables for σπ N value determination with experimental data. We also discuss the expected difficulties for the accurate determination of the value of σπ N due to the correlation between the σ term and the potential parameter in the pion–nucleus optical potential. [ABSTRACT FROM AUTHOR]

Published
2023
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29. First Precision Spectroscopy of Pionic Atoms at RI Beam Factory

Author

Itahashi, Kenta, Berg, Georg P. A., Fujioka, Hiroyuki, Geissel, Hans, Hayano, Ryugo S., Hirenzaki, Satoru, Ikeno, Natsumi, Inabe, Naohito, Itoh, Satoshi, Kameda, Daisuke, Kubo, Toshiyuki, Matsubara, Hiroaki, Michimasa, Shinichiro, Miki, Kenjiro, Miya, Hiroyuki, Nakamura, Masaki, Nishi, Takahiro, Noji, Shumpei, Ota, Shinsuke, Suzuki, Ken, Takeda, Hiroyuki, Todoroki, Koichi, Tsukada, Kyo, Uesaka, Tomohiro, Weick, Helmut, and Yoshida, Koichi

Published
2013
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30. Pionic atom factory project in the RIBF: Spectroscopy of pionic atom in 122Sn (d, 3He) Nuclear Reaction

Author

Itahashi, Kenta, Itoh, Satoshi, Fukunishi, Nobuhisa, Geissel, Hans, Hayano, Ryugo S., Hirenzaki, Satoru, Iwasaki, Masahiko, Kienle, Paul, Kimura, Rie, Lindberg, Karl, Nociforo, Chiara, Ohnishi, Hiroaki, Okada, Shinji, Ono, Naoya, Outa, Haruhiko, Sato, Masaharu, Suzuki, Ken, Suzuki, Takatoshi, Tatsuno, Hideyuki, Tegnér, Per–Erik, Wakasugi, Masanori, Weick, Helmut, Yamagata–Sekihara, Junko, Yamazaki, Toshimitsu, Yano, Yasushige, and Zartova, Irina

Published
2009
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31. Chiral symmetry restoration at high matter density observed in pionic atoms

Author

Nishi, Takahiro, Itahashi, Kenta, Ahn, DeukSoon, Berg, Georg P. A., Dozono, Masanori, Etoh, Daijiro, Fujioka, Hiroyuki, Fukuda, Naoki, Fukunishi, Nobuhisa, Geissel, Hans, Haettner, Emma, Hashimoto, Tadashi, Hayano, Ryugo S., Hirenzaki, Satoru, Horii, Hiroshi, Ikeno, Natsumi, Inabe, Naoto, Iwasaki, Masahiko, Kameda, Daisuke, Kisamori, Keichi, Kiyokawa, Yu, Kubo, Toshiyuki, Kusaka, Kensuke, Matsushita, Masafumi, Michimasa, Shin’ichiro, Mishima, Go, Miya, Hiroyuki, Murai, Daichi, Nagahiro, Hideko, Niikura, Megumi, Nose-Togawa, Naoko, Ota, Shinsuke, Sakamoto, Naruhiko, Sekiguchi, Kimiko, Shiokawa, Yuta, Suzuki, Hiroshi, Suzuki, Ken, Takaki, Motonobu, Takeda, Hiroyuki, Tanaka, Yoshiki K., Uesaka, Tomohiro, Wada, Yasumori, Watanabe, Atomu, Watanabe, Yuni N., Weick, Helmut, Yamakami, Hiroki, Yanagisawa, Yoshiyuki, and Yoshida, Koichi

Abstract

According to quantum chromodynamics, vacuum is not an empty space, because it is filled with quark–antiquark pairs. The pair has the same quantum numbers as the vacuum and forms a condensate because the strong interaction of the quantum chromodynamics is too strong to leave the vacuum empty. This quark–antiquark condensation, the chiral condensate, breaks the chiral symmetry of the vacuum. The expectation value of the chiral condensate is an order parameter of the chiral symmetry, which is expected to decrease at high temperatures or high matter densities where the chiral symmetry is partially restored. Head-on collisions of nuclei at ultra-relativistic energies have explored the high-temperature regime, but experiments at high densities are rare. Here we measure the spectrum of pionic 121Sn atoms and study the interaction between the pion and the nucleus. We find that the expectation value of the chiral condensate is reduced at finite density compared to the value in vacuum. The reduction is linearly extrapolated to the nuclear saturation density and indicates that the chiral symmetry is partially restored due to the extremely high density of the nucleus.

Published
2023
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32. Pionic atom factory project in the RIBF

Author

Itahashi, Kenta, primary, Itoh, Satoshi, additional, Fukunishi, Nobuhisa, additional, Geissel, Hans, additional, Hayano, Ryugo S., additional, Hirenzaki, Satoru, additional, Iwasaki, Masahiko, additional, Kienle, Paul, additional, Kimura, Rie, additional, Lindberg, Karl, additional, Nociforo, Chiara, additional, Ohnishi, Hiroaki, additional, Okada, Shinji, additional, Ono, Naoya, additional, Outa, Haruhiko, additional, Sato, Masaharu, additional, Suzuki, Ken, additional, Suzuki, Takatoshi, additional, Tatsuno, Hideyuki, additional, Tegnér, Per–Erik, additional, Wakasugi, Masanori, additional, Weick, Helmut, additional, Yamagata–Sekihara, Junko, additional, Yamazaki, Toshimitsu, additional, Yano, Yasushige, additional, and Zartova, Irina, additional

Published
2009
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33. Structure of double pionic atoms

Author

Tani, Akari, primary, Ikeno, Natsumi, additional, Jido, Daisuke, additional, Nagahiro, Hideko, additional, Fujioka, Hiroyuki, additional, Itahashi, Kenta, additional, and Hirenzaki, Satoru, additional

Published
2021
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34. \(\bar{K}\)-Nuclear Bound State at J-PARC

Author

Sakuma, Fuminori, primary, Ajimura, Shuhei, additional, Asano, Hidemitsu, additional, Beer, George, additional, Berucci, Carolina, additional, Bhang, Hyoungchan, additional, Bragadireanu, Mario, additional, Buehler, Paul, additional, Busso, Luigi, additional, Cargnelli, Michael, additional, Choi, Seonho, additional, Curceanu, Catalina, additional, Enomoto, Shun, additional, Fujioka, Hiroyuki, additional, Fujiwara, Yuya, additional, Fukuda, Tomokazu, additional, Guaraldo, Carlo, additional, Hashimoto, Tadashi, additional, Hayano, Ryugo S., additional, Hiraiwa, Toshihiko, additional, Iio, Masami, additional, Iliescu, Mihai, additional, Inoue, Kentaro, additional, Ishiguro, Yosuke, additional, Ishikawa, Takashi, additional, Ishimoto, Shigeru, additional, Itahashi, Kenta, additional, Iwasaki, Masahiko, additional, Kanno, Koki, additional, Kato, Kazuma, additional, Kato, Yuko, additional, Kawasaki, Shingo, additional, Kienle, Paul, additional, Kou, Hiroshi, additional, Ma, Yue, additional, Marton, Johann, additional, Matsuda, Yasuyuki, additional, Mizoi, Yutaka, additional, Morra, Ombretta, additional, Nagae, Tomofumi, additional, Noumi, Hiroyuki, additional, Ohnishi, Hiroaki, additional, Okada, Shinji, additional, Outa, Haruhiko, additional, Piscicchia, Kristian, additional, Sada, Yuta, additional, Sakaguchi, Atsushi, additional, Sato, Masaharu, additional, Scordo, Alessandro, additional, Sekimoto, Michiko, additional, Shi, Hexi, additional, Shirotori, Kotaro, additional, Sirghi, Diana, additional, Sirghi, Florin, additional, Suzuki, Ken, additional, Suzuki, Shoji, additional, Suzuki, Takatoshi, additional, Tanida, Kiyoshi, additional, Tatsuno, Hideyuki, additional, Tokuda, Makoto, additional, Tomono, Dai, additional, Toyoda, Akihisa, additional, Tsukada, Kyo, additional, Vázquez Doce, Oton, additional, Widmann, Eberhard, additional, Yamaga, Takumi, additional, Yamazaki, Toshimitsu, additional, Zhang, Qi, additional, and Zmeskal, Johannes, additional

Published
2020
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35. Comparison of 3ΛH/4ΛH production cross-section via (K−, π0) reaction at J-PARC.

Author

Akaishi, Takaya, Asano, Hidemitsu, Chen, Xurong, Clozza, Alberto, Curceanu, Catalina, Del Grande, Raffaele, Guaraldo, Carlo, Han, Chengdong, Hashimoto, Tadashi, Iliescu, Mihai, Inoue, Kentaro, Ishimoto, Shigeru, Itahashi, Kenta, Iwasaki, Masahiko, Ma, Yue, Murayama, Rie, Miliucci, Marco, Noumi, Hiroyuki, Ohnishi, Hiroyuki, and Okada, Shinji

Subjects
NUCLEAR cross sections, HEAVY ion collisions, HYPERTRITONS, BINDING energy, NUCLEAR reactions
Abstract

Recent heavy-ion collision experiments reported a surprisingly short lifetime for the hypertriton, which has been recognized as the hypertriton lifetime puzzle. Our J-PARC E73 experiment contributes to solve this puzzle with an independent experimental method by employing 3He(K−, π0) 3ΛH reaction. In this contribution, we will demonstrate our capability to provide 3ΛH binding energy information by deriving the production cross section ratio, σ3ΛH/σ4ΛH. The production cross section data for 3ΛH and 4ΛH are already available as the pilot run of E73 experiment and data analysis is in progress. [ABSTRACT FROM AUTHOR]

Published
2022
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37. Pionic Atoms Spectroscopy at RCNP with the (p,2He) Reaction

Author

Sakaue, Akane, primary, Adachi, Satoshi, additional, Fujikawa, Yuki, additional, Fujioka, Hiroyuki, additional, Furuno, Tatsuya, additional, Inaba, Kento, additional, Itahashi, Kenta, additional, Kawabata, Takahiro, additional, Kobayashi, Nobuyuki, additional, Murata, Motoki, additional, Tamii, Atsushi, additional, and Watanabe, Yuni N., additional

Published
2020
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38. K− pp bound system at J-PARC

Author

Sakuma, Fuminori, primary, Ajimura, Shuhei, additional, Asano, Hidemitsu, additional, Beer, George, additional, Berucci, Carolina, additional, Bhang, Hyoungchan, additional, Bragadireanu, Mario, additional, Buehler, Paul, additional, Busso, Luigi, additional, Cargnelli, Michael, additional, Choi, Seonho, additional, Curceanu, Catalina, additional, Enomoto, Shun, additional, Fujioka, Hiroyuki, additional, Fujiwara, Yuya, additional, Fukuda, Tomokazu, additional, Guaraldo, Carlo, additional, Hashimoto, Tadashi, additional, Hayano, Ryugo S., additional, Hiraiwa, Toshihiko, additional, Iio, Masami, additional, Iliescu, Mihai, additional, Inoue, Kentaro, additional, Ishiguro, Yosuke, additional, Ishikawa, Takashi, additional, Ishimoto, Shigeru, additional, Itahashi, Kenta, additional, Iwasaki, Masahiko, additional, Kanno, Koki, additional, Kato, Kazuma, additional, Kato, Yuko, additional, Kawasaki, Shingo, additional, Kienle, Paul, additional, Kou, Hiroshi, additional, Ma, Yue, additional, Marton, Johann, additional, Matsuda, Yasuyuki, additional, Mizoi, Yutaka, additional, Morra, Ombretta, additional, Nagae, Tomofumi, additional, Noumi, Hiroyuki, additional, Ohnishi, Hiroaki, additional, Okada, Shinji, additional, Outa, Haruhiko, additional, Piscicchia, Kristian, additional, Sada, Yuta, additional, Sakaguchi, Atsushi, additional, Sato, Masaharu, additional, Scordo, Alessandro, additional, Sekimoto, Michiko, additional, Shi, Hexi, additional, Shirotori, Kotaro, additional, Sirghi, Diana, additional, Sirghi, Florin, additional, Suzuki, Ken, additional, Suzuki, Shoji, additional, Suzuki, Takatoshi, additional, Tanida, Kiyoshi, additional, Tatsuno, Hideyuki, additional, Tokuda, Makoto, additional, Tomono, Dai, additional, Toyoda, Akihisa, additional, Tsukada, Kyo, additional, Doce, Oton Vázquez, additional, Widmann, Eberhard, additional, Yamaga, Takumi, additional, Yamazaki, Toshimitsu, additional, Zhang, Qi, additional, and Zmeskal, Johannes, additional

Published
2020
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39. Λ(1405) Spectroscopy via the In-flight d(K−, n) Reaction at the J-PARC K1.8BR

Author

Kawasaki, Shingo, primary, Aikawa, Shu, additional, Ajimura, Shuhei, additional, Akaishi, Takaya, additional, Asano, Hidemitsu, additional, Beer, George, additional, Berruci, Carolina, additional, Bragadireanu, Mario, additional, Buehler, Paul, additional, Busso, Luigi, additional, Cargnelli, Michael, additional, Choi, Seonho, additional, Curceanu, Catalina, additional, Enomoto, Shun, additional, Fujioka, Hiroyuki, additional, Fujiwara, Yuya, additional, Fukuda, Tomokazu, additional, Guaraldo, Carlo, additional, Hashimoto, Tadashi, additional, Hayano, Ryugo S., additional, Hiraiwa, Toshihiko, additional, Iio, Masami, additional, Iliescu, Mihai, additional, Inoue, Kentaro, additional, Ishiguro, Yosuke, additional, Ishikawa, Takashi, additional, Ishimoto, Shigeru, additional, Itahashi, Kenta, additional, Iwai, Masaaki, additional, Iwasaki, Masahiko, additional, Kanno, Koki, additional, Kato, Kazuma, additional, Kato, Yuko, additional, Kienle, Paul, additional, Komatsu, Yusuke, additional, Kou, Hirofumi, additional, Ma, Yue, additional, Marton, Johann, additional, Matsuda, Yasuyuki, additional, Mizoi, Yutaka, additional, Morra, Ombretta, additional, Nagae, Tomofumi, additional, Noumi, Hiroyuki, additional, Ohnishi, Hiroaki, additional, Okada, Shinji, additional, Omar, Zhadyra, additional, Outa, Haruhiko, additional, Piscicchia, Kristian, additional, Sada, Yuta, additional, Sakaguchi, Atsushi, additional, Sakuma, Fuminori, additional, Sato, Masaharu, additional, Scordo, Alessandro, additional, Sekimoto, Michiko, additional, Shi, Hexi, additional, Shirotori, Kotaro, additional, Sirghi, Diana, additional, Sirghi, Florin, additional, Suzuki, Ken, additional, Suzuki, Shoji, additional, Suzuki, Takatoshi, additional, Tanida, Kiyoshi, additional, Tatsuno, Hideyuki, additional, Tokiyasu, Atsushi O., additional, Tokuda, Makoto, additional, Tomono, Dai, additional, Toyoda, Akihisa, additional, Tsukada, Kyo, additional, Vazquez Doce, Oton, additional, Widmann, Eberhard, additional, Yamaga, Takumi, additional, Yamazaki, Toshimitsu, additional, Yim, Heejoong, additional, Zhang, Qi, additional, and Zmeskal, Johann, additional

Published
2019
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40. Results of \(\bar{K}NN\) Search via the (K−, n) Reaction at J-PARC

Author

Yamaga, Takumi, primary, Ajimura, Shuhei, additional, Asano, Hidemitsu, additional, Beer, George, additional, Berucci, Carolina, additional, Bhang, Hyeongchan, additional, Bragadireanu, Mario, additional, Buehler, Paul, additional, Busso, Luigi, additional, Cargnelli, Michael, additional, Choi, Seonho, additional, Curceanu, Catalina, additional, Enomoto, Shun, additional, Fujioka, Hiroyuki, additional, Fujiwara, Yuya, additional, Fukuda, Tomokazu, additional, Guaraldo, Carlo, additional, Hashimoto, Tadashi, additional, Hayano, Ryugo S., additional, Hiraiwa, Toshihiko, additional, Iio, Masami, additional, Iliescu, Mihai, additional, Inoue, Kentaro, additional, Ishiguro, Yosuke, additional, Ishikawa, Takashi, additional, Ishimoto, Shigeru, additional, Itahashi, Kenta, additional, Iwasaki, Masahiko, additional, Kanno, Koki, additional, Kato, Kazuma, additional, Kato, Yuko, additional, Kawasaki, Shingo, additional, Kienle, Paul, additional, Kou, Hirofumi, additional, Ma, Yue, additional, Marton, Johann, additional, Matsuda, Yasuyuki, additional, Mizoi, Yutaka, additional, Morra, Ombretta, additional, Nagae, Tomofumi, additional, Noumi, Hiroyuki, additional, Ohnishi, Hiroaki, additional, Okada, Shinji, additional, Outa, Haruhiko, additional, Piscicchia, Kristian, additional, Sada, Yuta, additional, Sakaguchi, Atsushi, additional, Sakuma, Fuminori, additional, Sato, Masaharu, additional, Scordo, Alessandro, additional, Sekimoto, Michiko, additional, Shi, Hexi, additional, Shirotori, Kotaro, additional, Sirghi, Diana, additional, Sirghi, Florin, additional, Suzuki, Ken, additional, Suzuki, Shoji, additional, Suzuki, Takatoshi, additional, Tanida, Kiyoshi, additional, Tatsuno, Hideyuki, additional, Tokuda, Makoto, additional, Tomono, Dai, additional, Toyoda, Akihisa, additional, Tsukada, Kyo, additional, Vazquez Doce, Oton, additional, Widmann, Eberhard, additional, Yamazaki, Toshimitsu, additional, Zhang, Qi, additional, and Zmeskal, Johann, additional

Published
2019
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41. Extension of the J-PARC Hadron Experimental Facility - summary report

Author

Hiroyuki Fujioka, Hicks, Kenneth, Igarashi, Yoichi, Itahashi, Kenta, Komatsubara, Takeshi K., Miwa, Kouji, Nagae, Tomofumi, Nakamura, Satoshi N., Nanjo, Hajime, Noumi, Hiroyuki, Ohnishi, Hiroaki, Okada, Shinji, Sakaguchi, Atsushi, Sawada, Shinya, Shimizu, Suguru, Shirotori, Kotaro, Takahashi, Hitoshi, Takahashi, Toshiyuki, Tamura, Hirokazu, Tanida, Kiyoshi, and Ukai, Mifuyu

Subjects
High Energy Physics - Experiment (hep-ex), GeneralLiterature_INTRODUCTORYANDSURVEY, FOS: Physical sciences, Nuclear Experiment (nucl-ex), GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), Nuclear Experiment, High Energy Physics - Experiment
Abstract

The committee for the study of the extension of the Hadron Experimental Facility was formed under the Hadron Hall Users' Association in August, 2015. This document is a summary of the discussions among the committee members, and documented by a part of the members listed below., 22 pages, 2 figures, Hadron Users' Association Home Page: http://www.rcnp.osaka-u.ac.jp/~jparchua/en/index.html

Published
2017

42. Spectroscopy of Pionic Atoms Via (p, 2He) Reaction

Author

Watanabe, Yuni N., primary, Adachi, Satoshi, additional, Aoi, Nori, additional, Ashikaga, Sakiko, additional, Fujioka, Hiroyuki, additional, Furuno, Tatsuya, additional, Geissel, Hans, additional, Guillaume, Gey, additional, Hashimoto, Takashi, additional, Hatanaka, Kichiji, additional, Hayano, Ryugo S., additional, Heguri, Katsuyoshi, additional, Inaba, Kento, additional, Inoue, Azusa, additional, Itahashi, Kenta, additional, Iwamoto, Chihiro, additional, Kawabata, Takahiro, additional, Matsuda, Yohei, additional, Matsumoto, Shota, additional, Morimoto, Takahiro, additional, Murata, Motoki, additional, Nishi, Takahiro, additional, Noji, Shunpei, additional, Ong, Hooi J., additional, Sakaue, Akane, additional, Takahashi, Yu, additional, Tamii, Atsushi, additional, Tanaka, Yoshiki K., additional, Tang, Tsz L., additional, Terashima, Satoru, additional, Tsumura, Miho, additional, and Watanabe, Ken, additional

Published
2017
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44. \(\eta \)n Scattering Length from the \(\gamma \)d \( \to \) p\(\eta \)n Reaction at \(E_{\gamma } \sim 0.9\) GeV

Author

Ishikawa, Takatsugu, primary, Fujioka, Hiroyuki, additional, Honda, Yuki, additional, Hotta, Tomoaki, additional, Inoue, Yosuke, additional, Itahashi, Kenta, additional, Kanda, Hiroki, additional, Kawai, Hideyuki, additional, Maeda, Kazushige, additional, Miyabe, Manabu, additional, Miyata, Seiya, additional, Matsumura, Yuji, additional, Muramatsu, Norihito, additional, Ohnishi, Hiroaki, additional, Ozawa, Kyoichiro, additional, Sasagawa, Mizuki, additional, Shimizu, Hajime, additional, Shiraishi, Ken’ichiro, additional, Tabata, Makoto, additional, Tokiyasu, Atsushi O, additional, and Tsuchikawa, Yusuke, additional

Published
2017
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45. Excitation Spectra of Carbon Nuclei near \(\eta '\) Emission Threshold

Author

Itahashi, Kenta, primary, Ayyad, Yassid, additional, Benlliure, Jose, additional, Brinkmann, Kai-Thomas, additional, Friedrich, Stefan, additional, Fujioka, Hiroyuki, additional, Geissel, Hans, additional, Gellanki, Jnaneswari, additional, Guo, Chenlei, additional, Gutz, Eric, additional, Haettner, Emma, additional, Harakeh, Muhsin N., additional, Hayano, Ryugo S., additional, Higashi, Yuko, additional, Hirenzaki, Satoru, additional, Hornung, Christine, additional, Igarashi, Yoichi, additional, Ikeno, Natsumi, additional, Iwasaki, Masahiko, additional, Jido, Daisuke, additional, Kalantar-Nayestanaki, Nasser, additional, Kanungo, Rituparna, additional, Knoebel, Ronja, additional, Kurz, Nikolaus, additional, Metag, Volker, additional, Mukha, Ivan, additional, Nagae, Tomofumi, additional, Nagahiro, Hideko, additional, Nanova, Mariana, additional, Nishi, Takahiro, additional, Ong, Hooi Jin, additional, Pietri, Stephane, additional, Prochazka, Andrej, additional, Rappold, Christophe, additional, Reiter, Moritz P., additional, Rodríguez-Sánchez, José L., additional, Scheidenberger, Christoph, additional, Simon, Haik, additional, Sitar, Branislav, additional, Strmen, Peter, additional, Sun, Baohua, additional, Suzuki, Ken, additional, Szarka, Imrich, additional, Takechi, Maya, additional, Tanaka, Yoshiki K., additional, Tanihata, Isao, additional, Terashima, Satoru, additional, Watanabe, Yuni N., additional, Weick, Helmut, additional, Widmann, Eberhard, additional, Winfield, John S., additional, Xu, Xiaodong, additional, Yamakami, Hiroki, additional, and Zhao, Jianwei, additional

Published
2017
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46. Missing Mass Spectroscopy of $\eta'$ Mesic Nuclei with the $(p,d)$ Reaction at GSI

Author

Tanaka, Yoshiki K., Brinkmann, Kai-Thomas, Friedrich, Stefan, Fujioka, Hiroyuki, Geissel, Hans, Hayano, Ryugo S., Hirenzaki, Satoru, Itahashi, Kenta, Itoh, Satoshi, Jido, Daisuke, Metag, Volker, Nagahiro, Hideko, Nanova, Mariana, Nishi, Takahiro, Okochi, Kota, Outa, Haruhiko, Suzuki, Ken, Suzuki, Takatoshi, Watanabe, Yuni N., and Weick, Helmut

Subjects
eta(958): bound state, mass [eta(958)], chiral [symmetry], carbon, nucleus, p: beam, meson, optics, beam [p], symmetry: chiral, Cherenkov counter, eta(958): mass, nuclear matter, ddc:530, spectrometer, Darmstadt GSI FAIR, missing-mass, bound state [eta(958)]
Abstract

25th International Nuclear Physics Conference, Florence, Italy, 2 Jun 2013 - 7 Jun 2013; The European physical journal / Web of Conferences Web of Conferences : proceedings proceedings 66, 09019 (2014). doi:10.1051/epjconf/20146609019, Published by EDP Sciences, Les Ulis

Published
2014
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47. Spectroscopy of $\eta$′ Mesic Nuclei via Semi-Exclusive Measurement at FAIR

Author

Lunardi, S., Brinkmann, Kai-Thomas, Friedrich, Stefan, Geissel, Hans, Hayano, Ryugo S., Hirenzaki, Satoru, Itahashi, Kenta, Itoh, Satoshi, Jido, Daisuke, Metag, Volker, Nagahiro, Hideko, Nanova, Mariana, Nishi, Takahiro, Okochi, Kota, Outa, Haruhiko, Suzuki, Ken, Suzuki, Takatoshi, Tanaka, Yoshiki K., Watanabe, Yuni N., and Weick, Helmut

Subjects
ddc:530
Abstract

INPC 2013 – International Nuclear Physics Conference International Nuclear Physics Conference, INPC 2013, Firenze, Italy, 2 Jun 2013 - 7 Jun 2013; Les Ulis : EDP Sciences (2014). doi:10.1051/epjconf/20146609006, Published by EDP Sciences, Les Ulis

Published
2014
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48. $\eta '$ mesic nucleus spectroscopy with $(p,d)$ reaction at GSI

Author

Tanaka, Yoshiki K., Ayyad, Yassid, Haettner, Emma, Harakeh, Muhsin N., Hayano, Ryugo S., Higashi, Yuko, Hirenzaki, Satoru, Hornung, Christine, Igarashi, Yoichi, Ikeno, Natsumi, Itahashi, Kenta, Iwasaki, Masahiko, Benlliure, Jose, Jido, Daisuke, Kalantar-Nayestanaki, Nasser, Kanungo, Rituparna, Knoebel, Ronja, Kurz, Nikolaus, Metag, Volker, Mukha, Ivan, Nagae, Tomofumi, Nagahiro, Hideko, Nanova, Mariana, Brinkmann, Kai-Thomas, Nishi, Takahiro, Ong, Hooi Jin, Pietri, Stephane, Prochazka, Andrej, Rappold, Christophe, Reiter, Moritz P., Sanchez, Jose Luis Rodriguez, Scheidenberger, Christoph, Simon, Haik, Sitar, Branislav, Friedrich, Stefan, Strmen, Peter, Sun, Baohua, Suzuki, Ken, Szarka, Imrich, Takechi, Maya, Tanihata, Isao, Terashima, Satoru, Watanabe, Yuni N., Weick, Helmut, Widmann, Eberhard, Fujioka, Hiroyuki, Winfield, John S., Xu, Xiaodong, Yamakami, Hiroki, Zhao, Jianwei, Geissel, Hans, Gellanki, Jnaneswari, Guo, Chenlei, Gutz, Eric, and Research unit Nuclear & Hadron Physics

Subjects
eta(958), Physics, nucleus, particle separator, threshold, 2.5 GeV, Nuclear Experiment, missing-mass, Darmstadt Lab, experimental results
Abstract

Contribution to Proceedings, Proc. of PANIC 2014, 286 - 289; DESY-PROC-2014-02; ISSN 1435-8077

Published
2014
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49. Search forη′ mesic nuclei by missing-mass spectroscopy of the12C(p,d) reaction

Author

Tanaka, Yoshiki K., primary, Ayyad, Yassid, additional, Benlliure, Jose, additional, Brinkmann, Kai-Thomas, additional, Friedrich, Stefan, additional, Fujioka, Hiroyuki, additional, Geissel, Hans, additional, Gellanki, Jnaneswari, additional, Guo, Chenlei, additional, Gutz, Eric, additional, Haettner, Emma, additional, Harakeh, Muhsin N., additional, Hayano, Ryugo S., additional, Higashi, Yuko, additional, Hirenzaki, Satoru, additional, Hornung, Christine, additional, Igarashi, Yoichi, additional, Ikeno, Natsumi, additional, Itahashi, Kenta, additional, Iwasaki, Masahiko, additional, Jido, Daisuke, additional, Kalantar-Nayestanaki, Nasser, additional, Kanungo, Rituparna, additional, Knoebel, Ronja, additional, Kurz, Nikolaus, additional, Metag, Volker, additional, Mukha, Ivan, additional, Nagae, Tomofumi, additional, Nagahiro, Hideko, additional, Nanova, Mariana, additional, Nishi, Takahiro, additional, Ong, Hooi Jin, additional, Pietri, Stephane, additional, Prochazka, Andrej, additional, Rappold, Christophe, additional, Reiter, Moritz P., additional, Rodríguez Sánchez, Jose Luis, additional, Scheidenberger, Christoph, additional, Simon, Haik, additional, Sitar, Branislav, additional, Strmen, Peter, additional, Sun, Baohua, additional, Suzuki, Ken, additional, Szarka, Imrich, additional, Takechi, Maya, additional, Tanihata, Isao, additional, Terashima, Satoru, additional, Watanabe, Yuni N., additional, Weick, Helmut, additional, Widmann, Eberhard, additional, Winfield, John S., additional, Xu, Xiaodong, additional, Yamakami, Hiroki, additional, and Zhao, Jianwei, additional

Published
2016
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50. Spectroscopy of $\eta '$ mesic nuclei using $(p,d)$ reaction

Author

Suzuki, Ken, primary, Brinkmann, Kai-Thomas, additional, Friedrich, Stephan, additional, Metag, Volker, additional, Nanova, Mariana, additional, Fujioka, Hiroyuki, additional, Nagae, Tomofumi, additional, Yamakami, Hiroki, additional, Geissel, Hans, additional, Weick, H., additional, Hayano, Ryugo S., additional, Nishi, Takahiro, additional, Suzuki, Takatoshi, additional, Tanaka, Yoshiki K., additional, Watanabe, Yuni N, additional, Igarashi, Y., additional, Higashi, Yuko, additional, Hirenzaki, Satoru, additional, Ikeno, Natsumi, additional, Nagahiro, Hideko, additional, Itahashi, Kenta, additional, Iwasaki, Masako, additional, Outa, Haruhiko, additional, and Jido, Daisuke, additional

Published
2014
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