New results on mesonic weak decay of p-shell Λ-hypernuclei

• DOI: 10.1016/j.physletb.2009.09.061
• Publication Date: 2009-09-30T09:26:28Z
• Authors: M. Agnello; A. Andronenkov; G. Beer; L. Benussi; M. Bertani; H.C. Bhang; G. Bonomi; E. Botta; M. Bregant; T. Bressani; S. Bufalino; L. Busso; D. Calvo; P. Camerini; B. Dalena; F. De Mori; G. D'Erasmo; F.L. Fabbri; A. Feliciello; A. Filippi; E.M. Fiore; A. Fontana; H. Fujioka; P. Genova; P. Gianotti; N. Grion; O. Hartmann; B. Kang; V. Lenti; V. Lucherini; S. Marcello; T. Maruta; N. Mirfakhrai; P. Montagna; O. Morra; T. Nagae; D. Nakajima; H. Outa; E. Pace; M. Palomba; A. Pantaleo; A. Panzarasa; V. Paticchio; S. Piano; F. Pompili; R. Rui; A. Sanchez Lorente; M. Sekimoto; G. Simonetti; A. Toyoda; R. Wheadon; A. Zenoni; A. Gal
• Keywords: Hypernucleus; Parity (physics); Branching fraction

The FINUDA experiment performed a systematic study of the charged mesonic weak decay channel $p$-shell $Λ$-hypernuclei. Negatively pion spectra from were measured with magnetic analysis for first time ${^{7}_ΛLi}$, ${^{9}_ΛBe}$, ${^{11}_ΛB}$ and ${^{15}_ΛN}$. shape $π^{-}$ was interpreted through comparison distorted wave calculations that take into account structure both hypernucleus daughter nucleus. Branching ratios $Γ_{π^{-}}/Γ_{tot}$ derived converted to rates $Γ_{π^{-}}$ by means known or extrapolated total widths $Γ_{tot}$ Based on these measurements, spin-parity assignment $1/2^+$ ${^{7}_ΛLi}$ $5/2^+$ ground-state are confirmed $3/2^+$ ${^{15}_ΛN}$ is assigned time.