Total branching ratio of the K⁻ two-nucleon absorption in ¹²C

Abstract

This work is a critical re-analysis of the results obtained by the AMADEUS collaboration, concerning the measurement of the K− multi-nucleon absorption reactions, on a 12C target, in the Λp final state (Del Grande et al 2019 Eur. Phys. J. C 79, 190). We show that a good estimate of the K− two-nucleon absorption total branching ratio can be extracted, given that the measured final state interactions and conversion reactions contain information on almost all the remaining hyperon-nucleon final state combinations. The main contribution to the total branching ratio of the K− two-nucleon absorption in Carbon is extracted from the measured ratios and is found to be , which is in agreement with recent theoretical predictions. The missing contribution, from those few channels for which a Λp pair could not be detected in the final state of the interaction, is also estimated combining both the measured branching ratios and the available theoretical information, and amounts to . All together the total branching ratio of the K− two-nucleon absorption in Carbon is found to be

A review of the low-energy K−-nucleus/nuclei interactions with light nuclei AMADEUS investigations

“…+5 −6 (syst.)) % aligns with the K − multi-nucleon absorption BRs measured in bubble chamber experiments [49,50]. Combining the experimental BRs for processes leading to Λp pair production (16.1 ± 2.9(stat.)…”

On the $$\hbox {K}^{-}$$ Absorptions in Light Nuclei by AMADEUS

“…In Ref. [45] it is demonstrated that the sum of the K − 2NA BRs measured in Ref. [34] (also reported in Fig.…”

“…2 top panel) gives an estimate of the total BR of the K − 2NA process in 12 C. This is motivated by the fact that almost all the hyperon-nucleon combinations emerging as primary products of the K − 2NA process contribute to the FSI and / conversion reactions in the measured p final state (see Ref. [45] for the details). The sum of the K − 2NA BRs measured in Ref.…”

On the Importance of Future, Precise, X-ray Measurements in Kaonic Atoms

“…Finally, we add a contribution to a non-mesic capture which contributes only to absorptive potential, denoted by NN. An experimental finding [31] is that it contributes 12% of all captures in Helium (see also [32]). The non-mesic interaction is expected to contribute a negligible shift, typical of large final phase space.…”