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Evidence for heavy hyperhydrogen (Λ)(6)h

Evidence for the neutron-rich hypernucleus (Λ)(6)H is presented from the FINUDA experiment at DAΦNE, Frascati, studying (π+,π-) pairs in coincidence from the K(stop)(-) + (6)Li →(Λ)(6)H + π+ production reaction followed by (Λ)(6)H → (6)He + π- weak decay. The production rate of (Λ)(6) undergoing thi...

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Published in:Physical review letters 2012-01, Vol.108 (4), p.042501-042501
Main Authors: 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
Format: Article
Language:English
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Summary:Evidence for the neutron-rich hypernucleus (Λ)(6)H is presented from the FINUDA experiment at DAΦNE, Frascati, studying (π+,π-) pairs in coincidence from the K(stop)(-) + (6)Li →(Λ)(6)H + π+ production reaction followed by (Λ)(6)H → (6)He + π- weak decay. The production rate of (Λ)(6) undergoing this two-body π- decay is determined to be (2.9 ± 2.0) × 10(-6)/K(stop)(-). Its binding energy, evaluated jointly from production and decay, is BΛ((Λ)(6)H) = (4.0 ± 1.1) MeV with respect to (5)H+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 (Λ)(6)H 0(g.s.)(+) → 1+ excitation.
ISSN:1079-7114