Evidence for 6ΛH
Agnello, M. · 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. · Fabbri, F. L. · Feliciello, A. · Filippi, A. · Fiore, E. M. · Fontana, A. · Fujioka, H. · Genova, P. · Gianotti, P. · Grion, N. · Lucherini, V. · Marcello, S. · Mirfakhrai, N. · Moia, F. · Morra, O. · Nagae, T. · Outa, H. · Pantaleo, A. · Paticchio, V. · Piano, S. · Rui, R. · Simonetti, G. · Wheadon, R. · Zenoni, A. · Gal, A.
Original · EN
Evidence for the neutron-rich hypernucleus 6ΛH is presented from the FINUDA experiment at DAΦNE, Frascati, studying (π+, π-) pairs in coincidence from the K- +6Li → 6 H+π+ production reaction followed by 6ΛH → 6He + π- weak decay. The production rate of 6ΛH undergoing this two-body π- decay is determined to be (2.9±2.0)·10-6/K-. Its binding energy, evaluated jointly from production and decay, is BΛ(6ΛH) = (4.0±1.1) MeV with respect to 5H+Λ. A systematic difference of (0.98 ± 0.74) MeV between BΛ values derived separately from decay and from production is tentatively assigned to the 6ΛH 0+g.s. → 1+ excitation.
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