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

• DOI: 10.1063/1.4949411
• Publication Date: 2016-05-25T13:29:15Z
• Authors: 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; 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
• Keywords: Elementary reaction

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