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1. Spectroscopic Study of Hyperon Resonace Below \(\bar{K}\)N Threshold via the d(K−, n) Reaction

Author

C. Guaraldo, Johann Marton, M. Sekimoto, O. Morra, Shun Enomoto, M. Poli Lener, Ryugo S. Hayano, J. Zmeskal, Michael Cargnelli, A. Scorde, Haruhiko Outa, B. K. Wuenschek, P. Kienle, Makoto Tokuda, Mario Bragadireanu, K. Inoue, Florin Sirghi, Shinji Okada, M. Iwasaki, Aya Sakaguchi, Akihiro Toyoda, T. Hashimoto, H. Yim, Hiroyuki Noumi, Hiroaki Ohnishi, T. Yamazaki, Paul Buehler, K. Piscicchia, M. Iliescu, S. Ishimoto, H. Kou, Y. Kato, Y. Mizoi, Toshihiko Hiraiwa, Catalina Curceanu, E. Widmann, O. Vazquez Doce, Yasuhiro H. Matsuda, D. Faso, Tomokazu Fukuda, Y. Sada, Y. Fujiwara, K. Tanida, K. Shirotori, S. Ajimura, Masami Iio, Ken Suzuki, D. Tomono, K. Itahashi, Tomofumi Nagae, H. C. Bhang, G. A. Beer, Yue Ma, Fuminori Sakuma, L. Busso, Y. Ishiguro, S. Y. Suzuki, Q. Zhang, T. Suzuki, Hexi Shi, M. Iwai, Masatoshi Sato, T. Ishiwatari, H. Tatsuno, S. Choi, T. Yamaga, T. Ishikawa, Diana Sirghi, A. Romero Vidal, K. Tsukada, S. Kawasaki, and H. Fujioka

Subjects
Physics, 010308 nuclear & particles physics, 0103 physical sciences, Hyperon, Analytical chemistry, 010306 general physics, 01 natural sciences, Bar (unit)
Published
2017

2. A search for deeply-bound kaonic nuclear states by in-flight 3He(K-, N) reaction at J-PARC

Author

Hiroaki Ohnishi, Catalina Curceanu, Diana Sirghi, Michael Cargnelli, J. Zmeskal, T. Ishiwatari, Makoto Tokuda, Toshihiko Hiraiwa, Hexi Shi, Tomofumi Nagae, K. Piscicchia, O. Morra, Masatoshi Sato, Mario Bragadireanu, S. Kawasaki, K. Tsukada, D. Faso, Fuminori Sakuma, M. Poli Lener, H. Tatsuno, T. Hashimoto, Paul Buehler, Ryugo S. Hayano, L. Busso, T. Yamaga, Kiyoshi Tanida, Y. Kato, O. Vazquez Doce, Akihiro Toyoda, S. Choi, Kenta Itahashi, Paul Kienle, C. Guaraldo, Q. Zhang, Alessandro Scordo, H. Yim, M. Iliescu, Y. Sada, A. Romero Vidal, Shun Enomoto, M. Sekimoto, Yasuyuki Matsuda, Ken Suzuki, Johann Marton, B. K. Wuenschek, T. Ishikawa, Eberhard Widmann, S. Ishimoto, G. A. Beer, Masahiko Iwasaki, Hiroyuki Fujioka, Florin Sirghi, S. Ajimura, Masami Iio, Tomokazu Fukuda, Y. Fujiwara, Hyoungchan Bhang, H. Kou, Haruhiko Outa, Atsushi Sakaguchi, Yutaka Mizoi, K. Inoue, Hiroyuki Noumi, M. Iwai, D. Tomono, Shinji Okada, Yue Ma, T. Yamazaki, Y. Ishiguro, T. Suzuki, and S. Y. Suzuki

Subjects
Nuclear physics, Physics, General Physics and Astronomy, J-PARC
Published
2014

3. Study of the elementary (K-, n) reactions to search for the K NN bound state via the3He (K-, n) reaction at J-PARC

Author

A. Romero Vidal, S. Kawasaki, H. Fujioka, H. Kou, K. Itahashi, Koki Kanno, Fuminori Sakuma, Shinji Okada, D. Faso, Florin Sirghi, Tomofumi Nagae, Hiroaki Ohnishi, T. Yamazaki, T. Kim, D. Sirghi, Y. Kato, Y. Ishiguro, C. Guaraldo, Yue Ma, G. A. Beer, K. Inoue, H. Outa, Alessandro Scordo, Catalina Curceanu, T. Hashimoto, Michael Cargnelli, Hiroyuki Noumi, M. Sekimoto, T. Suzuki, J. Marton, Shigeru Ishimoto, T. Ishiwatari, Y. Sada, M. Iwai, Akihiro Toyoda, L. Busso, S. Y. Suzuki, S. Ajimura, Masami Iio, D. Tomono, Atsushi Sakaguchi, H. Tatsuno, M. Iliescu, Makoto Tokuda, Ken Suzuki, Paul Buehler, K. Kato, M. Bragadireanu, O. Vazquez Doce, Tomokazu Fukuda, Y. Fujiwara, H. C. Bhang, Yutaka Mizoi, Carolina Berucci, H. Yim, Toshihiko Hiraiwa, Hexi Shi, Ryugo S. Hayano, Kotaro Shirotori, M. Iwasaki, S. Choi, Q. Zhang, M. Sato, T. Yamaga, Kiyoshi Tanida, Shun Enomoto, E. Widmann, T. Ishikawa, Johann Zmeskal, B. K. Wuenschek, K. Tsukada, O. Morra, K. Piscicchia, Yasuhiro H. Matsuda, and Paul Kienle

Subjects
Physics, Deuterium, Hydrogen, chemistry, Yield (chemistry), Hadron, Bound state, Elementary reaction, Physical chemistry, chemistry.chemical_element, Neutron, Atomic physics, Helium
Abstract

We have searched for the simplest kaonic nuclear state, KNN, using the in-flight 3He (K-, n) reaction at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at θnlab=0°, an excess of yield was observed just below the K- pp mass-threshold, which cannot be explained by any elementary reactions [PTEP 2015, 061D01]. To understand the missing-mass spectrum of 3He (K-, n) X, we investigated the elementary (K-, n) reactions using hydrogen and deuterium targets. The p (K-, n) X missing-mass spectrum was well described by the charge-exchange reaction. However, in the d (K-, n) X spectrum, we observed an excess of yield just below the K- p mass-threshold, which was similar to that in the 3He (K-, n) X spectrum. (Less)

Published
2016

4. Spectroscopic Study of Hyperon Resonances below \(\bar{K}N\) Threshold via the \(\left( K^{ - },n \right)\) Reaction on Deuteron

Author

Mario Bragadireanu, Johann Marton, O. Morra, T. Suzuki, K. Tsukada, S. Kawasaki, M. Poli Lener, S. Choi, H. Fujioka, M. Iwai, T. Yamaga, K. Shirotori, Toshihiko Hiraiwa, Shinji Okada, Ken Suzuki, S. Ishimoto, Haruhiko Outa, M. Iwasaki, Y. Mizoi, T. Yamazaki, Michael Cargnelli, K. Inoue, C. Guaraldo, Hiroaki Ohnishi, M. Sekimoto, A. Romero Vidal, Hexi Shi, T. Ishikawa, Tomokazu Fukuda, Hiroyuki Noumi, L. Busso, H. Kou, M. Iliescu, H. C. Bhang, E. Widmann, Y. Fujiwara, T. Hashimoto, J. Zmeskal, Makoto Tokuda, G. A. Beer, Masatoshi Sato, Ryugo S. Hayano, Y. Ishiguro, D. Tomono, S. Ajimura, Masami Iio, S. Y. Suzuki, Florin Sirghi, T. Tanida, Tomofumi Nagae, Q. Zhang, Paul Buehler, Yue Ma, D. Faso, Y. Sada, Y. Kato, P. Kienle, O. Vazquez Doce, Aya Sakaguchi, Akihiro Toyoda, H. Yim, Fuminori Sakuma, Al Scordo, K. Itahashi, Catalina Curceanu, Diana Sirghi, T. Ishiwatari, K. Piscicchia, Yasuhiro H. Matsuda, H. Tatsuno, B. K. Wuenschek, and Shun Enomoto

Subjects
Physics, Nuclear physics, Nuclear magnetic resonance, Deuterium, Bar (music), Hyperon
Published
2015

5. A search for the K-pp bound state in the 3He(K- in-flight, n) reaction at J-PARC

Author

Ken Suzuki, S. Ishimoto, Michael Cargnelli, Mario Bragadireanu, Ryugo S. Hayano, H. Kou, S. Y. Suzuki, C. Guaraldo, K. Inoue, Johann Marton, G. A. Beer, L. Busso, S. Kawasaki, K. Piscicchia, T. Hashimoto, Paul Kienle, Hiroyuki Fujioka, Q. Zhang, S. Choi, Catalina Curceanu, Makoto Tokuda, D. Tomono, Florin Sirghi, M. Iliescu, Kyo Tsukada, J. Zmeska, Atsushi Sakaguchi, S. Ajimura, Masami Iio, Y. Kato, Hyoungchan Bhang, K. Itahashi, Paul Buehler, Yuuki Fujiwara, Shun Enomoto, O. Morra, Toshihiko Hiraiwa, D. Faso, Yasuyuki Matsuda, Tomofumi Nagae, O. Vazquez Doce, M. Poli Lener, Yue Ma, A. Romero Vida, B. K. Wuenschek, Eberhard Widmann, Tomokazu Fukuda, H. Yim, Haruhiko Outa, Shinji Okada, Masahiko Iwasaki, T. Yamazaki, Hiroyuki Noumi, Y. Sada, Yutaka Mizoi, Akihiro Toyoda, Y. Ishiguro, Fuminori Sakuma, T. Suzuki, Hiroaki Ohnishi, H. Tatsuno, Alessandro Scordo, Michiko Sekimoto, T. Ishikawa, T. Ishiwatari, T. Yamaga, Kiyoshi Tanida, Hexi Shi, Masatoshi Sato, M. Iwai, and Diana Sirghi

Subjects
Physics, Nuclear physics, Spectrometer, QC1-999, Bound state, Neutron, Statistical physics, J-PARC
Abstract

We have collected the first physics data of an experimental search for the simplest kaonic nuclear bound state, “ K − pp”, by the 3He( K − n) reaction at J-PARC. We confirmed that our spectrometer system works as designed and observed clear peak structure composed of the quasi-elastic K − “ n ” → K − n and the charge-exchange K − “ p ” → ¯ K 0 n reactions in the forward neutron spectrum.

Published
2014

6. Structure near the K- + p + p threshold in the in-flight 3He(K-, Λp)n reaction

Author

A. Romero Vidal, Shun Enomoto, Florin Sirghi, S. Ishimoto, Diana Sirghi, Haruhiko Outa, M. Iwasaki, Paul Buehler, Shinji Okada, B. K. Wuenschek, K. Itahashi, Mario Bragadireanu, Tomokazu Fukuda, Hexi Shi, Tomofumi Nagae, S. Kawasaki, K. Inoue, Y. Fujiwara, Hiroyuki Fujioka, Johann Marton, T. Yamazaki, T. Hashimoto, Masatoshi Sato, K. Piscicchia, O. Vazquez Doce, T. Ishiwatari, M. Iwai, Catalina Curceanu, Yasuhiro H. Matsuda, H. C. Bhang, Y. Kato, G. A. Beer, H. Tatsuno, Yutaka Mizoi, Q. Zhang, Akihiro Toyoda, S. Choi, Michael Cargnelli, Hiroyuki Noumi, T. Yamaga, C. Guaraldo, Ken Suzuki, J. Zmeskal, Makoto Tokuda, K. Tanida, H. Kou, Y. Sada, D. Faso, O. Morra, K. Tsukada, P. Kienle, M. Sekimoto, Atsushi Sakaguchi, M. Iliescu, E. Widmann, T. Ishikawa, S. Y. Suzuki, H. Yim, S. Ajimura, Masami Iio, L. Busso, M. Bazzi, D. Tomono, Yue Ma, Toshihiko Hiraiwa, Hiroaki Ohnishi, Ryugo S. Hayano, Y. Ishiguro, Fuminori Sakuma, Alessandro Scordo, and T. Suzuki

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Form factor (quantum field theory), General Physics and Astronomy, Dalitz plot, Order (ring theory), Lambda, Kinetic energy, 01 natural sciences, 0103 physical sciences, High Energy Physics::Experiment, Absorption (logic), Nuclear Experiment, 010306 general physics, Nucleon, Energy (signal processing)
Abstract

To search for an S= -1 di-baryonic state which decays to $\Lambda p$, the $ {\rm{}^3He}(K^-,\Lambda p)n_{missing}$ reaction was studied at 1.0 GeV/$c$. Unobserved neutrons were kinematically identified from the missing mass $M_X$ of the $ {\rm{}^3He}(K^-,\Lambda p)X$ reaction in order to have a large acceptance for the $\Lambda pn$ final state. The observed $\Lambda p n$ events, distributed widely over the kinematically allowed region of the Dalitz plot, establish that the major component comes from a three nucleon absorption process. A concentration of events at a specific neutron kinetic energy was observed in a region of low momentum transfer to the $\Lambda p$. To account for the observed peak structure, the simplest S-wave pole was assumed to exist in the reaction channel, having Breit-Wigner form in energy and with a Gaussian form-factor. A minimum $\chi^2$ method was applied to deduce its mass $M_X\ =$ 2355 $ ^{+ 6}_{ - 8}$ (stat.) $ \pm 12$ (syst.) MeV/c$^2$, and decay-width $\Gamma_X\ = $ 110 $ ^{+ 19}_{ - 17}$ (stat.) $ \pm 27$ (syst.) MeV/c$^2$, respectively. The form factor parameter $Q_X \sim$ 400 MeV/$c$ implies that the range of interaction is about 0.5

Published
2016

7. Search for the K-pp bound state via the 3He(K-, n) reaction at 1 GeV/c

Author

Michael Cargnelli, S. Choi, T. Yamaga, Kiyoshi Tanida, Hexi Shi, Masatoshi Sato, Tomofumi Nagae, K. Itahashi, M. Iliescu, Hyoungchan Bhang, H. Yim, D. Faso, J. Zmeskal, C. Guaraldo, Atsushi Sakaguchi, Makoto Tokuda, E. Widmann, T. Suzuki, Y. Sada, M. Sekimoto, Akihiro Toyoda, D. Tomono, Tomokazu Fukuda, S. Kawasaki, Y. Fujiwara, O. Morra, T. Ishiwatari, Ken Suzuki, Paul Buehler, Fuminori Sakuma, L. Busso, M. Poli Lener, Yutaka Mizoi, O. Vazquez Doce, T. Ishikawa, Hiroaki Ohnishi, S. Ajimura, Yue Ma, Diana Sirghi, T. Hashimoto, Mario Bragadireanu, Y. Ishiguro, Masami Iio, Haruhiko Outa, Paul Kienle, Y. Kato, K. Inoue, S. Ishimoto, Hiroyuki Fujioka, Shinji Okada, Catalina Curceanu, A. Romero Vidal, H. Tatsuno, T. Yamazaki, Hiroyuki Noumi, Johann Marton, H. Kou, Alessandro Scordo, Q. Zhang, S. Y. Suzuki, B. K. Wuenschek, Kyo Tsukada, G. A. Beer, Masahiko Iwasaki, Ryugo S. Hayano, Florin Sirghi, Shun Enomoto, Toshihiko Hiraiwa, K. Piscicchia, Yasuhiro H. Matsuda, and M. Iwai

Subjects
Physics, Nuclear physics, History, Particle physics, Hadron, Spectrum (functional analysis), Bound state, Computer Science Applications, Education
Abstract

The J-PARC E15 experiment searches for the simplest kaonic nuclear bound state, K−pp, via the 3He(K−,n) reaction at the K1.8BR beam-line in the J-PARC hadron experimental facility. We performed the first data-taking in May, 2013, with 5 × 109 incident kaons on the 3He target. The preliminary results are reported focusing on the forward-neutron spectrum, which shows a clear peak structure composed of the quasi-elastic K−"n" → K−n and the charge-exchange K−"p" → 0n reactions as expected.

Published
2014

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