Formation of A = 12. sigma. /sup -/ hypernucleus from K/sup -/ absorption at rest; Observation of a. sigma. /sup -/ spin-orbit doublet of narrow widths
1985
High-resolution spectroscopy of ..pi../sup +/ from K/sup -/ absorption at rest has been used for the first time to identify ..sigma../sup -/ hypernuclear states. The observed spectrum from a (CH)/sub n/ target has revealed a p/sub 3/2/-p/sub 1/2/ doublet of /sup 12/Be with narrow widths. The spin-orbit splitting of ..sigma../sup -/ is deduced to be 5 MeV, 0.8 times that for nucleons.
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