Σ hypernuclear bound state observed in stopped K- reaction on4He

R. S. Hayano, T. Ishikawa, M. Iwasaki, H. Outa, E. Takada, H. Tamura, A. Sakaguchi, M. Aoki, T. Yamazaki

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28 Citations (Scopus)

Abstract

Results are presented of inclusive measurements of π± momentum spectra from K- absorption at rest in liquid helium. We found a peak in the π- spectrum at ΔM≡M ( Σ 4 He)-M(4He)=267.7±0.3 (statistical) -0.1 +1.1 (systematic) MeV (B Σ +=3.2 MeV). The width of the peak was deduced to be 4.6±0.5 (statistical) -1.3 +1.6 (systematic) MeV. The (K-, π+) spectrum does not exhibit a clear peak in the Σ- bound region. Comparison of these two spectra suggests that the peak in the π- spectrum is due to the formation of the S=0, I=1/2 ground state of Σ 4 He.

Original languageEnglish
Pages (from-to)437-444
Number of pages8
JournalIl Nuovo Cimento A Series 11
Volume102
Issue number2
DOIs
Publication statusPublished - 1989 Aug
Externally publishedYes

Keywords

  • 13.75.Ev - Hyperon-nucleon interactions (energy ≤ 10 GeV)
  • 21.80 - Hypernuclei
  • 25.80.Nv - Kaon-induced reactions and scattering

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics

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