Formation of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>A</mi><mo>=</mo><mn>12</mn><mn></mn></math> <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>Σ</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> Hypernucleus from <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> Absorption at Rest; Observation of a <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>Σ</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> Spin-Orbit Doublet of Narrow Widths

T. Yamazaki; T. Ishikawa; K. H. Tanaka; Y. Akiba; M. Iwasaki; S. Ohtake; H. Tamura; M. Nakajima; T. Yamanaka; I. Arai; T. Suzuki; F. Naito; R. S. Hayano

doi:10.1103/PhysRevLett.54.102

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

T. Yamazaki, T. Ishikawa, K. H. Tanaka, Y. Akiba, M. Iwasaki, S. Ohtake, H. Tamura, M. Nakajima, T. Yamanaka, I. Arai, T. Suzuki, F. Naito, and R. S. Hayano

Phys. Rev. Lett. 54, 102 – Published 14 January 1985

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.