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The parity-transfer $({}^{16}{\rm O},{}^{16}{\rm F}(0^-,{\rm g.s.}))$reaction is presented as a new probe for investigating isovector $0^-$ statesin nuclei. The properties of $0^-$ states provide a stringent test of thethreshold density for pion condensation in nuclear matter. Utilizing a $0^+\rightarrow 0^-$ transition in the projectile, the parity-transfer reactiontransfers an internal parity to a target nucleus, resulting in a uniquesensitivity to unnatural-parity states. Consequently, the selectivity for $0^-$states is higher than in other reactions employed to date. The probe wasapplied to a study of the $0^-$ states in ${}^{12}{\rm B}$ via the ${}^{12}{\rmC}({}^{16}{\rm O},{}^{16}{\rm F}(0^-,{\rm g.s.}))$ reaction at $247~{\rmMeV/u}$. The excitation energy spectra were deduced by detecting the${}^{15}{\rm O}+p$ pair produced in the decay of the ${}^{16}{\rm F}$ ejectile.A known $0^-$ state at $E_x = 9.3~{\rm MeV}$ was observed with anunprecedentedly high signal-to-noise ratio. The data also revealed newcandidates of $0^-$ states at $E_x=6.6 \pm 0.4$ and $14.8 \pm 0.3~{\rm MeV}$.The results demonstrate the high efficiency of $0^-$ state detection by theparity-transfer reaction.

The parity-transfer $({}^{16}{\rm O},{}^{16}{\rm F}(0^-,{\rm g.s.}))$ reaction as a probe of isovector $0^-$ states in nuclei