LXX International conference "NUCLEUS – 2020. Nuclear physics and elementary particle physics. Nuclear physics technologies"

Investigating the kaonic atoms and K− nuclear absorption at low-energy: SIDDHARTA-2 and AMADEUS

16 Oct 2020, 18:00

25m

Online

Oral report Section 1. Experimental and theoretical studies of the properties of atomic nuclei. Section 1. Experimental and theoretical studies of the properties of atomic nuclei

Speaker

Dr Raffaele Del Grande (INFN - Laboratori Nazionali di Frascati)

Description

The SIDDHARTA-2 and AMADEUS collaborations aim to provide experimental information on the low-energy strong interaction between antikaons and nucleons. The investigation of the antikaons dynamics in nuclear medium is fundamental for understanding the non-perturbative QCD in the strangeness sector, with implications going from the domain of nuclear physics to astrophysics. The DA$\mathrm{\Phi }$NE collider provides a unique source of monochromatic low-momentum kaons ($p_{\mathrm{K}}\sim 127\mathrm{MeV}/\mathrm{c}$) from the $\varphi$-meson decay nearly at-rest, ideal to explore the interactions of the kaons at low-energy or to stop them in the targets. SIDDHARTA-2, which is the upgraded experiment of SIDDHARTA, studies the physics of kaonic atoms. The goal is to measure the X-rays emitted in the atomic transitions of the kaonic deuterium, the energy shift and the width of the 1s level will allow to extract for the first time the isospin dependence of the KbarN scattering amplitude at the energy threshold. AMADEUS explores the absorptions of the K${}^{-}$ in light nuclei (H, ${}^4$He, ${}^9$Be and ${}^{12}$C) in order to extract information about the possible existence of kaonic bound states with nucleons and the properties of hyperon resonances in the nuclear environment. As a first step, the hadronic interactions of the negatively charged kaons with the materials of the KLOE detector, used as an active target, are investigated by reconstructing hyperon-nucleon/nuclei (YN) and hyperon-pion (Y$\pi$) pairs emitted in the final state.