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

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


We have searched for the simplest kaonic nuclear state, K̄NN, 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.


  • Takumi Yamaga
  • S. Ajimura
  • G. Beer
  • C. Berucci
  • H. Bhang
  • M. Bragadireanu
  • P. Buehler
  • L. Busso
  • M. Cargnelli
  • S. Choi
  • C. Curceanu
  • S. Enomoto
  • D. Faso
  • H. Fujioka
  • Y. Fujiwara
  • T. Fukuda
  • C. Guaraldo
  • T. Hashimoto
  • R. S. Hayano
  • T. Hiraiwa
  • And 55 others
  • M. Iio
  • M. Iliescu
  • K. Inoue
  • Y. Ishiguro
  • T. Ishikawa
  • S. Ishimoto
  • T. Ishiwatari
  • K. Itahashi
  • M. Iwai
  • M. Iwasaki
  • K. Kanno
  • K. Kato
  • Y. Kato
  • S. Kawasaki
  • P. Kienle
  • T. Kim
  • H. Kou
  • Y. Ma
  • J. Marton
  • Y. Matsuda
  • Y. Mizoi
  • O. Morra
  • T. Nagae
  • H. Noumi
  • H. Ohnishi
  • S. Okada
  • H. Outa
  • K. Piscicchia
  • A. Romero Vidal
  • Y. Sada
  • A. Sakaguchi
  • F. Sakuma
  • M. Sato
  • A. Scordo
  • M. Sekimoto
  • H. Shi
  • K. Shirotori
  • D. Sirghi
  • F. Sirghi
  • K. Suzuki
  • S. Suzuki
  • T. Suzuki
  • K. Tanida
  • H. Tatsuno
  • M. Tokuda
  • D. Tomono
  • A. Toyoda
  • K. Tsukada
  • O. Vazquez Doce
  • E. Widmann
  • B. K. Wuenschek
  • T. Yamazaki
  • H. Yim
  • Q. Zhang
  • J. Zmeskal
External organisations
  • Seoul National University
  • “Horia Hulubei” National Institute of Physics and Nuclear Engineering
  • University of Tokyo
  • Technical University of Munich
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Title of host publicationXVIth International Conference on Hadron Spectroscopy, Hadron 2015
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735413894
StatePublished - 2016 May 25
Publication categoryResearch
Externally publishedYes
Event16th International Conference on Hadron Spectroscopy, Hadron 2015 - Newport News, United States
Duration: 2015 Sep 132015 Sep 18


Conference16th International Conference on Hadron Spectroscopy, Hadron 2015
CountryUnited States
CityNewport News