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New results on mesonic weak decay of <i>p</i>-shell <i>Λ</i>-hypernuclei
Agnello, M.,Andronenkov, A.,Beer, G.,Benussi, L.,Bertani, M.,Bhang, H.C.,Bonomi, G.,Botta, E.,Bregant, M.,Bressani, T.,Bufalino, S.,Busso, L.,Calvo, D.,Camerini, P.,Dalena, B.,De Mori, F.,D'Erasmo, G. Elsevier 2009 Physics letters: B Vol.681 No.2
<P><B>Abstract</B></P><P>The FINUDA experiment performed a systematic study of the charged mesonic weak decay channel of <I>p</I>-shell <I>Λ</I>-hypernuclei. Negatively charged pion spectra from mesonic decay were measured with magnetic analysis for the first time for <SUP>7</SUP><SUB><I>Λ</I></SUB>Li, <SUP>9</SUP><SUB><I>Λ</I></SUB>Be, <SUP>11</SUP><SUB><I>Λ</I></SUB>B and <SUP>15</SUP><SUB><I>Λ</I></SUB>N. The shape of the <SUP>π−</SUP> 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 <SUB>Γ<SUP>π−</SUP></SUB>/<SUB>Γtot</SUB> were derived from the measured spectra and converted to <SUP>π−</SUP> decay rates <SUB>Γ<SUP>π−</SUP></SUB> by means of known or extrapolated total decay widths <SUB>Γtot</SUB> of <I>p</I>-shell <I>Λ</I>-hypernuclei. Based on these measurements, the spin-parity assignment 1/<SUP>2+</SUP> for <SUP>7</SUP><SUB><I>Λ</I></SUB>Li and 5/<SUP>2+</SUP> for <SUP>11</SUP><SUB><I>Λ</I></SUB>B ground-state are confirmed and a spin-parity 3/<SUP>2+</SUP> for <SUP>15</SUP><SUB><I>Λ</I></SUB>N ground-state is assigned for the first time.</P>
Correlated Λt pairs from the absorption of K<sup>-</sup> at rest in light nuclei
FINUDA Collaboration,Agnello, M.,Andronenkov, A.,Beer, G.,Benussi, L.,Bertani, M.,Bhang, H.C.,Bonomi, G.,Botta, E.,Bregant, M.,Bressani, T.,Bufalino, S.,Busso, L.,Calvo, D.,Camerini, P.,Caponero, M.,D North-Holland Pub. Co 2008 Physics letters: B Vol.669 No.3
Novel data from the K<SUB>stop</SUB><SUP>-</SUP>A absorption reaction in light nuclei <SUP>6,7</SUP>Li and <SUP>9</SUP>Be are presented. The study aimed at finding Λt correlations. Regardless of A, the Λt pairs are preferentially emitted in opposite directions. Reaction modeling predominantly assigns to the K<SUB>stop</SUB><SUP>-</SUP>A->Λt(N)A<SUP>'</SUP> direct reactions the emission of the Λt pairs whose yield is found to range from 10<SUP>-3</SUP> to 10<SUP>-4</SUP>/K<SUB>stop</SUB><SUP>-</SUP>. The experiment was performed with the FINUDA spectrometer at DAΦNE (LNF).