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: K_stop⁻ + ^AZ → _Λ^AZ + 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, Γ_π⁻–2body and Γ_π⁻–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.