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28 March 2024
 
  » arxiv » 0905.0623

 Article overview


New results on Mesonic Weak Decay of $p$-shell $Lambda$-Hypernuclei
FINUDA Collaboration ; 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 ;
Date 5 May 2009
AbstractThe FINUDA experiment performed a systematic study of the charged mesonic weak decay channel of $p$-shell $Lambda$-hypernuclei. Negatively charged pion spectra from mesonic decay were measured with magnetic analysis for the first time for ${^{7}_{Lambda}Li}$, ${^{9}_{Lambda}Be}$, ${^{11}_{Lambda}B}$ and ${^{15}_{Lambda}N}$. The shape of the $pi^{-}$ spectra was interpreted through a comparison with pion distorted wave calculations that take into account the structure of both hypernucleus and daughter nucleus. Branching ratios $Gamma_{pi^{-}}/Gamma_{tot}$ were derived from the measured spectra and converted to $pi^{-}$ decay rates $Gamma_{pi^{-}}$ by means of known or extrapolated total decay widths $Gamma_{tot}$ of $p$-shell $Lambda$-hypernuclei. Based on these measurements, the spin-parity assignment $5/2^+$ for ${^{11}_{Lambda}B}$ ground-state is firmly confirmed and a spin-parity $3/2^+$ for ${^{15}_{Lambda}N}$ ground-state is determined for the first time.
Source arXiv, 0905.0623
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