Low energy kaon-nuclei interaction studies at DAΦNE

¹ Centro Ricerche Enrico Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, 00184 Rome, Italy
² INFN - Laboratori Nazionali di Frascati, 00044 Frascati, Italy
³ Stefan-Meyer-Institut für Subatomare Physik, 1030 Wien, Austria
⁴ Physik Department E12, Technische Universität München, 85748 Garching, Germany
⁵ Excellence Cluster “Origin and Structure of the Universe”, 85748 Garching, Germany
⁶ Institute of Physics, Jagiellonian University, 30-348 Cracow, Poland
⁷ National Centre for Nuclear Research, 02-093 Warsaw, Poland
⁸ INFN Sezione di Roma Tre, Roma, Italy
⁹ Dipartimento di Fisica dell’Università “Sapienza”, Roma, Italy
¹⁰ INFN Sezione di Roma, Roma, Italy
¹¹ Dipartimento di Matematica e Fisica dell’Università “Roma Tre”, Roma, Italy
¹² ENEA, Department of Fusion and Technology for Nuclear Safety and Security, Frascati (RM), Italy
¹³ Dipartimento di Scienze e Tecnologie applicate, Università “Guglielmo Marconi”, Roma, Italy

^* e-mail: kristian.piscicchia@cref.it

Published online: 27 April 2022

Abstract

The aim of the AMADEUS experiment is to investigate the lowenergy antikaon interaction with nucleons and nuclei, exploiting the unique lowmomentum beam of kaons produced by the DAΦNE collider at LNF-INFN, to constrain hadronic nuclear physics models in the strangeness -1 sector. As a first step the data collected in 2004/2005 by the KLOE collaboration, consisting in a complex of K⁻ absorptions in H, ⁴He, ⁹Be and ¹²C, was analyzed, leading to the first invariant mass spectroscopic study with very low momentum (about 100 MeV) in-flight K⁻ captures. A dedicated pure Carbon target was also implemented in the central region of the KLOE detector, providing a high statistic reference sample of pure at-rest K⁻ nuclear interaction. The first measurement of the non-resonant transition amplitude $\left| {{T_{{K^ - }n \to \Lambda {\pi ^ - }}}} \right|$$\left|T_{K^{-}n\to \Lambda {\pi }^{-}}\right|$ at $\sqrt s = 33$$\sqrt{s}=33$ MeV below the ${\text{\bar KN}}$$\overline{\text{K}}\text{N}$ threshold is presented, in relation with the Λ(1405) properties studies.