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HK: Fachverband Hadronen und Kerne
HK 35: Hadron Structure and Spectroscopy II
HK 35.7: Vortrag
Dienstag, 17. März 2009, 18:30–18:45, H-ZO 30
study of non mesonic weak decay of Λ– hypernuclei:recent results from FINUDA experiment — •stefania bufalino — INFN Sez. di Torino, via P. Giuria 1, Torino, Italy — Dip. di Fisica Sperimentale, Università di Torino, via P. Giuria, 1 Torino, Italy
In free space, a Λ particle decays dominantly as Λ → Nπ. In the case of Λ bound in a nucleus, a Λ hypernucleus, Λ is also able to couple with a nucleon as Λ N → nN (non-mesonic weak decay, NMWD). The FINUDA experiment is installed at one of the interaction regions of the DAFNE Φ-factory in Frascati and it is mostly dedicated to the high resolution spectroscopy of Λ hypernuclei and to the study of their weak decays. The aim of this work is to present the recent experimental results obtained from the study of the NMWD of Λ5He, Λ7Li, Λ9Be, Λ11B, Λ12C, Λ13C, Λ15N and Λ16O. Thanks to the excellent capabilities of the FINUDA detector (measurement of the proton spectra with magnetic analysis and production from very thin targets) the spectra feature a precision and low energy threshold (15 MeV) never reached in previous experiments. The measured spectra are quite different from the ones previously reported [1] as well as form the theoretical predictions [2](Λ5He and Λ12C). Also the contribution of the Final State Interaction and/or two nucleon absorption processes [3] has been evaluated.
[1] S. Okada et al., PLB 597 (2004), 249. [2] G. Garbarino et al., PRC 69 (2004) 054603. [3] W.M. Alberico and G. Garbarino, Phys. Rep. 369 (2002), 1.