Three candidate events of the neutron-rich hypernucleus 6Λ H were uniquely identified in the FINUDA experiment at DANE, Frascati, by observing π + mesons from the (K − stop,π +) production reaction on 6Li targets, in coincidence with π − mesons from 6Λ H→6He+ π − weak decay. Details of the experiment and the analysis of its data are reported, leading to an estimate of (2.9 ± 2.0) · 10−6/K − stop for the 6Λ H production rate times the two-body π − weak decay branching ratio. The 6 ΛH binding energy with respect to 5H+Λwas determined jointly from production and decay to be BΛ = (4.0±1.1) MeV, assuming that 5H is unbound with respect to 3H+2n by 1.7 MeV. The binding energy determined from production is higher, in each one of the three events, than that determined from decay, with a difference of (0.98±0.74) MeV here assigned to the 0+ g.s. →1+ excitation. The consequences of this assignment to Λ hypernuclear dynamics are briefly discussed.
First observation of the hyper superheavy hydrogen 6ΛH / M., Agnello; L., Benussi; M., Bertani; H. C., Bhang; G., Bonomi; E., Botta; Bregant, Marco; T., Bressani; S., Bufalino; L., Busso; D., Calvo; Camerini, Paolo; 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; V., Lucherini; S., Marcello; N., Mirfakhrai; F., Moia; O., Morra; T., Nagae; H., Outa; A., Pantaleo; V., Paticchio; Piano, Stefano; Rui, Rinaldo; G., Simonetti; R., Wheadon; A., Zenoni; A., Gal. - In: NUCLEAR PHYSICS. A. - ISSN 0375-9474. - STAMPA. - 881:(2012), pp. 269-287. [10.1016/j.nuclphysa.2012.02.015]
First observation of the hyper superheavy hydrogen 6ΛH
BREGANT, MARCO;CAMERINI, Paolo;PIANO, STEFANO;RUI, RINALDO;
2012-01-01
Abstract
Three candidate events of the neutron-rich hypernucleus 6Λ H were uniquely identified in the FINUDA experiment at DANE, Frascati, by observing π + mesons from the (K − stop,π +) production reaction on 6Li targets, in coincidence with π − mesons from 6Λ H→6He+ π − weak decay. Details of the experiment and the analysis of its data are reported, leading to an estimate of (2.9 ± 2.0) · 10−6/K − stop for the 6Λ H production rate times the two-body π − weak decay branching ratio. The 6 ΛH binding energy with respect to 5H+Λwas determined jointly from production and decay to be BΛ = (4.0±1.1) MeV, assuming that 5H is unbound with respect to 3H+2n by 1.7 MeV. The binding energy determined from production is higher, in each one of the three events, than that determined from decay, with a difference of (0.98±0.74) MeV here assigned to the 0+ g.s. →1+ excitation. The consequences of this assignment to Λ hypernuclear dynamics are briefly discussed.Pubblicazioni consigliate
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