https://doi.org/10.1140/epjc/s10052-019-6694-7
Regular Article - Experimental Physics
multi-nucleon absorption cross sections and branching ratios in 
and 
final states
1
CENTRO FERMI, Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, 00184, Rome, Italy
2
INFN - Laboratori Nazionali di Frascati, Via Enrico Fermi 40, 00044, Frascati, Italy
3
Excellence Cluster “Origin and Structure of the Universe”, 85748, Garching, Germany
4
Physik Department E12, Technische Universität München, 85748, Garching, Germany
5
Stefan-Meyer-Institut für Subatomare Physik, 1090, Wien, Austria
6
Institute of Physics, Jagiellonian University, 30-348, Cracow, Poland
7
Departament de Fisica Quantica i Astrofisica and Institut de Ciencies del Cosmos, Universitat de Barcelona, Marti i Franques 1, 08028, Barcelona, Spain
8
National Centre for Nuclear Research, 00681, Warsaw, Poland
9
INFN Sezione di Roma Tor Vergata, Roma, Italy
10
Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali dell’Università di Messina, Messina, Italy
11
INFN Sezione di Catania, Catania, Italy
12
Dipartimento di Scienze e Tecnologie applicate, Università “Guglielmo Marconi”, Roma, Italy
13
Dipartimento di Matematica e Fisica dell’Università “Roma Tre”, Roma, Italy
14
INFN Sezione di Roma Tre, Roma, Italy
* e-mail: raffaele.delgrande@lnf.infn.it
Received:
24
September
2018
Accepted:
18
February
2019
Published online:
4
March
2019
The determination of low-energy cross sections and branching ratios of the 
multi-nucleon absorption processes in and final states performed by the AMADEUS collaboration is presented. Low momentum (
) produced at the 
collider are impinged on a Carbon target within the KLOE detector and the two and three nucleon absorption processes are disentangled by comparing the experimental data to phenomenological calculations. The spectra are interpreted in terms of multi-nucleon absorption processes; the possible contribution of a 
bound state is demonstrated to overlap with the two nucleon capture process, its absolute yield thus resulting indistinguishable.
© The Author(s), 2019
