Isospin properties of (K-,N) reactions for the formation of deeply-bound antikaonic nuclei

The formation of deeply-bound antikaonic K-/K-bar0 nuclear states in nuclear (K-,N) reactions is investigated theoretically within a distorted-wave impulse approximation (DWIA), considering the isospin properties of the Fermi-averaged K-+N→N+K-bar elementary amplitudes. We calculate the formation cross sections of the deeply-bound K-bar states by the (K-,N) reactions on the nuclear targets, 12C and 28Si, at incident K- lab momentum pK-=1.0 GeV/c and θlab=0o, introducing a complex effective nucleon number Neff for unstable bound states in the DWIA. The results show that the deeply-bound K-bar states can be populated dominantly by the (K-,n) reaction via the total isoscalar ΔT=0 transition owing to the isospin nature of the K-+N→N+K-bar amplitudes, and that the cross sections described by ReNeff and ArgNeff enable to deduce the structure of the K-bar nuclear states; the calculated inclusive nucleon spectra for a deep K-bar-nucleus potential do not show distinct peak structure in the bound region. The few-body K-bar x[NN] and K-bar x[NNN] states formed in (K-,N) reactions on s-shell nuclear targets, 3He, 3H and 4He, are also discussed