Formation of $A = 12$ $Σ^{-}$ Hypernucleus from $K^{-}$ Absorption at Rest; Observation of a $Σ^{-}$ Spin-Orbit Doublet of Narrow Widths

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14 January 1985

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 54 (2) , 102-105
https://doi.org/10.1103/physrevlett.54.102

Abstract

High-resolution spectroscopy of

π^{+}

from

K^{-}

absorption at rest has been used for the first time to identify

Σ^{-}

hypernuclear states. The observed spectrum from a

{(CH)}_{n}

target has revealed a

p_{\frac{3}{2}} - p_{\frac{1}{2}}

doublet of

{}_{Σ^{-}}^{12}{Be}

with narrow widths. The spin-orbit splitting of

Σ^{-}

is deduced to be 5 MeV, 0.8 times that for nucleons.

Keywords

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