$\Sigma^- p$ emission rates in $K^-$ absorptions at rest on $^6$Li, $^7$Li, $^{9}$Be, $^{13}$C and $^{16}$O

TL;DR

This study measures the emission rates of $\, ext{Sigma}^- ext{p}$ reactions from stopped $K^-$ absorptions on various light nuclei, providing new data and insights into the absorption mechanisms and quasi-free processes.

Contribution

It provides new experimental emission rate measurements for $K^-$ absorptions on several light nuclei and analyzes the reaction spectra to explore quasi-free absorption processes.

Findings

Measured emission rates for $K^-$ absorption on different nuclei.

Observed spectra suggest quasi-free absorption by $(np)$ pairs.

Compared results with existing data, enhancing understanding of $K^-$ nuclear interactions.

Abstract

An experimental study of the $K^-_{stop}A\rightarrow \Sigma^- p A'$ reaction on $A=^6$Li, $^7$Li, $^9$Be, $^{13}$C and $^{16}$O $p$-shell nuclei is presented. The data were collected by the FINUDA spectrometer operating at the DA$\Phi$NE $\phi$-factory (LNF-INFN, Italy). Emission rates for the reaction in the mentioned nuclei are measured and compared with the few existing data. The spectra of several observables are discussed; indications of Quasi-Free absorptions by a $(np)$ pair embedded in the $A$ nucleus can be obtained from the study of the missing mass distributions.