Evidence for Heavy HyperhydrogenHΛ6

M. Agnello, L. Benussi, M. Bertani, H. C. Bhang, G. Bonomi, E. Botta, M. Bregant, T. Bressani, S. Bufalino, L. Busso, D. Calvo, P. Camerini (+27 others)
2012 Physical Review Letters  
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
more » ... values derived separately from decay and from production is tentatively assigned to the 6ΛH 0+g.s. → 1+ excitation.
doi:10.1103/physrevlett.108.042501 pmid:22400828 fatcat:xcoigzxixnalxmluzhryhfwrfa