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Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 35: Hadron Structure and Spectroscopy II

HK 35.6: Vortrag

Dienstag, 17. März 2009, 18:15–18:30, H-ZO 30

recent results on mesonic weak decays of Λ-hypernuclei with FINUDA — •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

Recent results obtained by analyzing the data collected up to now by the FINUDA spectrometer at the DAFNE complex at INFN-LNF in Frascati (Italy) will be presented, in particular the results on the weak π-mesonic decay channel of p-shell Λ-Hypernuclei will be discussed.

The study is related to the spectroscopy of negative pions spectra emitted in the mesonic weak decay of Λ5He, Λ7Li, Λ9Be, Λ11B and Λ15N following the reaction: Kstop + AZΛAZ + π

Exploiting both the target thinness and the good transparency of the FINUDA apparatus, pion momenta as low as 80 MeV/c have been analyzed with a dedicated version of the FINUDA reconstruction code, allowing to investigate for the first time the very low momentum region of negative pion spectra, populated through various mesonic decay mechanisms. Many-body and, when present, also two-body mesonic decay channels have been studied and the relative amplitudes, Γπ–2body and Γπ–tot, or branching ratios have been measured and will be presented. Comparison with existing experimental data [1] and theoretical predictions [2] will be showed.

[1] S. Kameoka et al., Nucl.Phys. A754 (2005),173. J. Sasao et al., Phys. Lett. B 579 (2004), 258.

[2] T. Motoba and K. Itonaga, Prog. Theor. Phys. Suppl. 117 (1994) 477.

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