The $A(K_{stop}^{-},{\pi }^{\pm }{\Sigma }^{\mp })A^{\prime }$ reaction on p-shell nuclei

Abstract

This letter is concerned with the study of the $K_{stop}^{-}A\to {\pi }^{\pm }{\Sigma }^{\mp }{A}^{\prime }$ reaction in p-shell nuclei, i.e., ${}^{6,7}Li$, ${}^{9}Be$, ${}^{13}C$ and ${}^{16}O$. The ${\pi }^{\pm }{\Sigma }^{\mp }/K_{stop}^{-}$ emission rates are reported as a function of $A$. These rates are discussed in comparison with previous findings. The ratio ${\pi }^{-}{\Sigma }^{+}/{\pi }^{+}{\Sigma }^{-}$ in p-shell nuclei is found to depart largely from that on hydrogen, which provides support for large in-medium effects possibly generated by the sub-threshold $\Lambda (1405)$. The continuum momentum spectra of prompt pions and free sigmas are also discussed as well as the ${\pi }^{\pm }{\Sigma }^{\mp }$ missing mass behavior and the link with the reaction mechanism. The apparatus used for the investigation is the FINUDA spectrometer operating at the DA$\Phi$NE $\varphi$-factory (LNF-INFN, Italy).

14 pages, 5 figures, accepted for publication in Phys. Lett. B

References in corpus (5)

• In-medium nuclear interactions of low-energy hadrons
• New results on Mesonic Weak Decay of $p$-shell $\Lambda$-Hypernuclei
• Strangeness nuclear physics - 2010
• Kaon induced Lambda(1405) production on a deuteron target at DAFNE
• Constraints on the threshold K- nuclear potential from FINUDA (stopped K-, pi-) hypernuclear spectra

Cited by in corpus (5)

• Strangeness in nuclear physics
• Evidence for 6ΛH
• Branching ratios of mesonic and nonmesonic antikaon absorptions in nuclear medium
• ${\Sigma }^{-}p$ emission rates in $K^{-}$ absorptions at rest on ${}^6$Li, ${}^7$Li, ${}^9$Be, ${}^{13}$C and ${}^{16}$O
• Mesonic and non-mesonic branching ratios of K^- absorption in the nuclear medium