Spectroscopy of hypernuclei with stopped kaons - recent result of KEK experiment

H. Tamura, W. Brückner, H. Döbbeling, R. S. Hayano, T. Ishikawa, M. Iwasaki, T. Motoki, H. Outa, S. Paul, B. Povh, A. Sakaguchi, R. Schüssler, E. Takada, K. H. Tanaka, T. Yamazaki

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Abstract

Pion momentum spectra from K- absorption at rest on various nuclear targets were measured by means of a magnetic spectrometer with wide momentum range (100 ∼ 300 MeV/c). The ground state of Σ- hypernucleus, if well bound with a narrow width, is expected to be populated in 12C(stopped K-, π+) inclusive (untagged) spectrum, but such a peak was not observed. The spectrum is compared with the DWIA calculations by Morimatsu and Yazaki, indicating that the depth of the nuclear potential of Σ- is shallower than 12 MeV, and that its imaginary part is larger than 5 MeV if the potential depth is about 10 MeV. In the 12C(stopped K-, π-) spectrum, the ground state (( p3 2)n-1 ( s1 2)Λ) and the excited states (( p3 2)n-1(p)Λ) of Λ12C were observed, and their formation probabilities were roughly in agreement with the results of DWIA calculations. In the π- spectra on 12C, 9Be, and 7Li targets a distinct peak was observed at 132.1±0.7 MeV/c. It is ascribed to π- from the mesic decay of Λ4H; Λ4H → 4He π-. The formation probability of Λ4H on C, Be, or Li target is much larger than those of the discrete states of Λ12C via the direct (stopped K-, π-) reaction.

Original languageEnglish
Pages (from-to)161-174
Number of pages14
JournalNuclear Physics, Section A
Volume479
Issue numberC
DOIs
Publication statusPublished - 1988
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Tamura, H., Brückner, W., Döbbeling, H., Hayano, R. S., Ishikawa, T., Iwasaki, M., Motoki, T., Outa, H., Paul, S., Povh, B., Sakaguchi, A., Schüssler, R., Takada, E., Tanaka, K. H., & Yamazaki, T. (1988). Spectroscopy of hypernuclei with stopped kaons - recent result of KEK experiment. Nuclear Physics, Section A, 479(C), 161-174. https://doi.org/10.1016/0375-9474(88)90435-6