MISC

2017年

Missing-mass spectroscopy with the Li 6 (π-,K+)X reaction to search for H Λ6

Physical Review C
  • R. Honda
  • ,
  • M. Agnello
  • ,
  • J. K. Ahn
  • ,
  • S. Ajimura
  • ,
  • Y. Akazawa
  • ,
  • N. Amano
  • ,
  • K. Aoki
  • ,
  • H. C. Bhang
  • ,
  • N. Chiga
  • ,
  • M. Endo
  • ,
  • P. Evtoukhovitch
  • ,
  • A. Feliciello
  • ,
  • H. Fujioka
  • ,
  • T. Fukuda
  • ,
  • S. Hasegawa
  • ,
  • S. H. Hayakawa
  • ,
  • K. Hosomi
  • ,
  • S. H. Hwang
  • ,
  • Y. Ichikawa
  • ,
  • Y. Igarashi
  • ,
  • K. Imai
  • ,
  • N. Ishibashi
  • ,
  • R. Iwasaki
  • ,
  • C. W. Joo
  • ,
  • R. Kiuchi
  • ,
  • J. K. Lee
  • ,
  • J. Y. Lee
  • ,
  • K. Matsuda
  • ,
  • Y. Matsumoto
  • ,
  • K. Matsuoka
  • ,
  • K. Miwa
  • ,
  • Y. Mizoi
  • ,
  • M. Moritsu
  • ,
  • T. Nagae
  • ,
  • S. Nagamiya
  • ,
  • M. Nakagawa
  • ,
  • M. Naruki
  • ,
  • H. Noumi
  • ,
  • R. Ota
  • ,
  • B. J. Roy
  • ,
  • P. K. Saha
  • ,
  • A. Sakaguchi
  • ,
  • H. Sako
  • ,
  • C. Samanta
  • ,
  • V. Samoilov
  • ,
  • Y. Sasaki
  • ,
  • S. Sato
  • ,
  • M. Sekimoto
  • ,
  • Y. Shimizu
  • ,
  • T. Shiozaki
  • ,
  • K. Shirotori
  • ,
  • T. Soyama
  • ,
  • H. Sugimura
  • ,
  • T. Takahashi
  • ,
  • T. N. Takahashi
  • ,
  • H. Tamura
  • ,
  • K. Tanabe
  • ,
  • T. Tanaka
  • ,
  • K. Tanida
  • ,
  • A. O. Tokiyasu
  • ,
  • Z. Tsamalaidze
  • ,
  • M. Ukai
  • ,
  • T. O. Yamamoto
  • ,
  • Y. Yamamoto
  • ,
  • S. B. Yang
  • ,
  • K. Yoshida

96
1
DOI
10.1103/PhysRevC.96.014005

© 2017 American Physical Society. We searched for the bound state of the neutron-rich Λ-hypernucleus HΛ6, using the Li6(π-,K+)X double charge-exchange reaction at a π- beam momentum of 1.2GeV/c at J-PARC. A total of 1.4×1012π- was driven onto a Li6 target of 3.5-g/cm2 thickness. No event was observed below the bound threshold, i.e., the mass of HΛ4+2n, in the missing-mass spectrum of the Li6(π-,K+)X reaction in the 2<θπK<20 angular range. Furthermore, no event was found up to 2.8MeV/c2 above the bound threshold. We obtained the double-differential cross section spectra of the Li6(π-,K+)X reaction in the angular range of 2<θπK<14. An upper limit of 0.56 nb/sr (90% C.L.) was obtained for the production cross section of the HΛ6 hypernucleus bound state. In addition, not only the bound state region, but also the Λ continuum region and part of the Σ- quasifree production region of the Li6(π-,K+) reaction were obtained with high statistics. The present missing-mass spectrum will facilitate the investigation of the Σ - nucleus optical potential for Σ - He5 through spectrum shape analysis.

リンク情報
DOI
https://doi.org/10.1103/PhysRevC.96.014005
Scopus Url
http://www.scopus.com/inward/record.url?eid=2-s2.0-85027105526&partnerID=MN8TOARS
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85027105526&origin=inward

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