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1. K - Pp bound system at J-PARC

Author

Eberhard Widmann, M. Iliescu, Haruhiko Outa, Hiroaki Ohnishi, K. Inoue, Yasuyuki Matsuda, Hiroyuki Noumi, Takashi Ishikawa, Makoto Tokuda, Masahiko Iwasaki, H. Tatsuno, Akihisa Toyoda, Toshimitsu Yamazaki, D. Tomono, M. Sato, Paul Kienle, Ken Suzuki, Michael Cargnelli, Kotaro Shirotori, Florin Sirghi, Hiroyuki Fujioka, Atsushi Sakaguchi, G. Beer, Oton Vazquez Doce, Shun Enomoto, Shinji Okada, Yue Ma, Hyoungchan Bhang, Mario Bragadireanu, Paul Buehler, K. Kato, Alessandro Scordo, T. Hashimoto, H. Kou, O. Morra, Johann Marton, Catalina Curceanu, Johannes Zmeskal, Y. Kato, Carolina Berucci, S. Kawasaki, Takatoshi Suzuki, Seonho Choi, L. Busso, S. Ajimura, Tomofumi Nagae, Masami Iio, Fuminori Sakuma, Y. Ishiguro, Qi Zhang, Y. Sada, Tomokazu Fukuda, Y. Fujiwara, Yutaka Mizoi, Kyo Tsukada, C. Guaraldo, Ryugo S. Hayano, H. Asano, Toshihiko Hiraiwa, Shigeru Ishimoto, Koki Kanno, Shoji Suzuki, Kristian Piscicchia, T. Yamaga, Kiyoshi Tanida, Hexi Shi, Diana Sirghi, Michiko Sekimoto, and Kenta Itahashi

Subjects
Physics, Binding energy, Bound state, J-PARC, State (functional analysis), Atomic physics
Abstract

The K¯NN bound system, symbolically denoted as “K−pp”, is the simplest K¯-nuclear bound system which has been widely discussed as a consequence of the strongly attractive K¯N interaction in I = 0 channels. Many theoretical works have pointed out the existence of the “K−pp” bound system, but the calculated properties such as the binding energy and the width spread out due to the uncertainty of the K¯N interaction below the K¯+N mass threshold. Experimentally, there are several reports on observation of a “K−pp” candidate with the binding energy of around 100 MeV, however, no definitive evidence was available so far. At J-PARC, we conducted a experimental search for the “K−pp” bound system using K− + 3He reaction at 1.0 GeV/c where the “K−pp” is expected to be directly produced via the (K−, n) reaction. We finally observed a bound state below the K− +p+p mass threshold in the Λpn final state, which can be interpreted as the “K− pp” bound state. The possible existence of the “K− pp” state is discussed from both aspects of production and decay.

Published
2020

2. Spectroscopic study of the Λ(1405) resonance via the d(K−, n) reaction at J-PARC

Author

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

Subjects
Nuclear physics, Momentum, Physics, Deuterium, Scattering, Isospin, Spectrum (functional analysis), Hyperon, J-PARC, Resonance (particle physics)
Abstract

The structure of the Λ(1405) hyperon is an important and long-standing issue related to the K-nucleus interaction. The J-PARC E31 experiment has been performed to investigate the Λ(1405) spectrum shape. Because it is hard to form the Λ(1405) directly by a KN scattering in free space, E31 uses the d(K-, n) reaction with an incident kaon momentum of 1 GeV/c. We will identify three final states - ς-π+, ς+π-, ς0π0-so that the isospin structure of hyperon resonance states produced can be decomposed. The first physics run of the E31 experiment was performed in 2016. To enhance the statistics of the data set, we have performed the second physics run in the beginning of 2018. During the second run of E31, around 3.9×1010 kaons impacted on the deuteron target.

Published
2019

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. Precision spectroscopy of kaonic helium-3 and helium-4 3d→ 2p X-rays

Author

T. Ishiwatari, M. Bazzi, H. Bhang, G. Beer, L. Bombelli, A. M. Bragadireanu, M. Cargnelli, S. Choi, G. Corradi, C. Curceanu, A. d’Uffizi, S. Enomoto, C. Fiorini, T. Frizzi, H. Fujioka, Y. Fujiwara, F. Ghio, B. Girolami, C. Guaraldo, T. Hashimoto, R. S. Hayano, T. Hiraiwa, M. Iio, M. Iliescu, S. Ishimoto, K. Itahashi, M. Iwasaki, P. Kienle, H. Kou, P. Levi Sandri, A. Longoni, V. Lucherini, J. Marton, Y. Matsuda, H. Noumi, H. Ohnishi, S. Okada, H. Outa, D. Pietreanu, T. Ponta, A. Rizzo, A. Romero Vidal, F. Sakuma, M. Sato, A. Scordo, M. Sekimoto, H. Shi, D. L. Sirghi, F. Sirghi, T. Suzuki, K. Tanida, H. Tatsuno, M. Tokuda, D. Tomono, A. Toyoda, K. Tsukada, A. Tudorache, V. Tudorache, O. Vazquez Doce, E. Widmann, B. Wünschek, T. Yamazaki, J. Zmeskal, Volker Crede, Paul Eugenio, and A. Ostrovidov

Subjects
Physics, Elastic scattering, Meson, sezele, chemistry.chemical_element, Nuclear physics, Helium-4, chemistry, Isospin, Helium-3, Atomic physics, Isotopes of helium, Helium, Exotic atom
Abstract

Recently, the shift of the kaonic helium-4 2p state was precisely determined by the E570 and SIDDHARTA experiments. Prior to the experiment by E570, the average of three earlier experimental results showed - 43±8 eV, while most of the theoretical calculations give ∼ 0 eV. This five-sigma discrepancy between theory and experiment was known as the "kaonic helium puzzle". A recent theoretical model showed a possible resonance-like shift of maximum 10 eV for a certain value of a deep antikaon-nucleon interaction potential, which is different in helium 3 and helium 4. The E570 experiment determined the shift of the kaonic helium-4 2p state as +2±2 (stat)±2 (sys) eV in 2007. The SIDDHARTA experiment determined the shift as 0±6 (stat)±2 (sys) eV in 2009. The results of these experiments resolved the long-standing puzzle. A new experiment of the kaonic helium-3 X-ray measurement is being prepared by the J-PARC E17 collaborators, and the kaonic helium-3 X-ray data taken very recently by the SIDDHARTA experiment are on the way to be analyzed. The results of the E570, E17 and SIDDHARTA experiments examine the strong interaction for light nuclei with different isospin, and test furthermore recent theoretical predictions. © 2010 American Institute of Physics.

Published
2010

5. Precision spectroscopy of kaonic helium-3 X-rays at J-PARC

Author

T. Hashimoto, H. Bhang, M. Cargnelli, Seonho Choi, C. Curceanu, S. Enomoto, H. Fujioka, Y. Fujiwara, C. Guaraldo, R. S. Hayano, T. Hiraiwa, M. Iio, K. Inoue, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwasaki, H. Kou, P. Kienle, J. Marton, Y. Matsuda, H. Noumi, H. Ohnishi, S. Okada, H. Outa, A. Romero Vidal, F. Sakuma, M. Sato, M. Sekimoto, H. Shi, D. Sirghi, F. Sirghi, T. Suzuki, K. Tanida, H. Tatsuno, M. Tokuda, D. Tomono, A. Toyoda, K. Tsukada, O. Vazquez Doce, E. Widmann, B. K. Wünschek, T. Yamazaki, J. Zmeskal, Atsushi Hosaka, Kanchan Khemchandani, Hideko Nagahiro, and Kanabu Nawa

Subjects
Physics, History, Particle physics, Silicon drift detector, Meson, Precision spectroscopy, Nuclear Theory, Hadron, Strong interaction, Measure (physics), Particle detector, Computer Science Applications, Education, Nuclear physics, Helium-4, Helium-3, J-PARC, Nuclear Experiment, Isotopes of helium
Abstract

We will measure the x‐rays from kaonic 3He and 4He 3d→2p transition by using silicon drift detectors. Our precision goal is set to 1 eV to provide crucial information on the kaon‐nucleus strong interaction in the low energy limit. The experiment is to be performed as one of the first experiment in the J‐PARC hadron facility (J‐PARC E17). An overview and the present status of the experiment are presented.

Published
2011

6. Spectroscopic study of Λ(1405) via the in-flight (K-,n) reaction on deuteron

Author

S. Enomoto, S. Ajimura, G. Beer, H. Bhang, M. Bragadireanu, P. Buehler, L. Busso, M. Cargnelli, S. Choi, C. Curceanu, D. Faso, H. Fujioka, Y. Fujiwara, T. Fukuda, C. Guaraldo, T. Hashimoto, R. Hayano, T. Hiraiwa, M. Iio, K. Inoue, N. Ishibashi, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwai, M. Iwasaki, S. Kawasaki, P. Kienle, H. Kou, J. Marton, Y. Matsuda, Y. Mizoi, O. Morra, T. Nagae, H. Noumi, H. Ohnishi, S. Okada, H. Outa, Y. Sada, A. Sakaguchi, F. Sakuma, M. Sato, M. Sekimoto, H. Shi, D. Sirghi, F. Sirghi, S. Suzuki, T. Suzuki, H. Tatsuno, M. Tokuda, D. Tomono, A. Toyoda, K. Tsukada, E. Widmann, T. Yamazaki, H. Yim, K. Yoshida, J. Zmeskal, Atsushi Hosaka, Kanchan Khemchandani, Hideko Nagahiro, and Kanabu Nawa

Subjects
Physics, Nuclear physics, Nuclear reaction, Pion, Deuterium, Isospin, Hadron, Hyperon, Nucleon, Lambda baryon
Abstract

We present an experimental study of Λ(1405) via the in‐flight (K−,n) reaction on the deuteron target (J‐PARC E31). We will measure all Σ+π−, Σ−π+ and Σ0π0 final states so that the isospin structure of the produced hyperon resonance state can be decomposed. In this report, we present an overview of the experiment and preparation status.

Published
2011

7. Precision spectroscopy of kaonic3He X-rays at J-PARC

Author

M. Sato, H. Bhang, M. Cargnelli, Seonho Choi, C. Curceanu, S. Enomoto, H. Fujioka, Y. Fujiwara, C. Guaraldo, T. Hashimoto, R. S. Hayano, T. Hiraiwa, M. Iio, K. Inoue, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwasaki, H. Kou, P. Kienle, J. Marton, Y. Matsuda, H. Noumi, H. Ohnishi, S. Okada, H. Outa, A. Romero Vidal, F. Sakuma, M. Sekimoto, H. Shi, D. Sirghi, F. Sirghi, T. Suzuki, K. Tanida, H. Tatsuno, M. Tokuda, D. Tomono, A. Toyoda, K. Tsukada, O. Vazquez Doce, E. Widmann, B. Wünschek, T. Yamazaki, J. Zmeskal, David Armstrong, Volker Burkert, Jian-Ping Chen, Will Detmold, Jo Dudek, Wally Melnitchouk, and David Richards

Subjects
Physics, Nuclear physics, Light nucleus, Particle physics, Silicon drift detector, Meson, Precision spectroscopy, Strong interaction, Hadron, Elementary particle, J-PARC
Abstract

We will measure the X‐rays from kaonic 3He 3d → 2p transition with a precision below 2 eV. It can provide crucial information on the kaon‐nucleus strong interaction. The experiment (J‐PARC E17) will be performed as Day‐1, which is one of the first experiments in the J‐PARC hadron facility in the year 2011. An overview and the present status of the J‐PARC E17 experiment are described.

Published
2011

8. A search for deeply bound kaonic nuclear states at J-PARC

Author

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

Subjects
Physics, Nuclear reaction, Nuclear physics, Particle decay, Particle physics, Pion, Meson, Bound state, Invariant mass, Neutron, J-PARC, Nucleon, Atomic and Molecular Physics, and Optics
Abstract

The J-PARC E15 experiment has the aims to search for the simplest kaonic nuclear bound state, K − pp, by the in-flight 3He(K −,n) reaction. The exclusive measurement is performed by a simultaneous measurement of the missing mass using the knocked out neutron and the invariant mass via the expected decay, K − pp → Λ p → pπ− p. In this paper, an overview of the experiment and current data analysis of the engineering runs performed in February and June 2012 are presented.

Published
2010

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