2011/01/24 by M. Agnello, Agnello, M., L. Benussi +80
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex
paper · pdf · doi:10.48550/arxiv.1101.4481
10 pages, 3 figures
arxiv created 2011/01/24 · openalex publication_date 2011/01/24 · arxiv updated 2011/01/25 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
The decay of Λ-hypernuclei without pion emission, known as Non Mesonic Weak Decay (NMWD), gives an effective tool to investigate ΔS=1 four-baryon interactions. It was theoretically suggested that the two-nucleon induced mechanism could play a substantial role in reproducing the observed NMWD decay rates and nucleon spectra, but at present no direct evidence of such a mechanism has been obtained. The FINUDA experiment, exploiting the possibility to detect both charged and neutral particles coming from the hypernucleus decay, has allowed us to deduce the relative weight of the two nucleon induced decay rate to the total NMWD rate. The value of Γ2N/ΓNMWD=0.24±0.03stat^+0.03sys_-0.02sys has been deduced, with an error reduced by a factor more than two compared with the previous assessment.