Three candidate events of the neutron-rich hypernucleus H-6(Lambda) were uniquely identified in the FINUDA experiment at DA Phi NE, Frascati, by observing pi(+) mesons from the (K-stop(-), pi(+)) production reaction on Li-6 targets, in coincidence with pi(-) mesons from H-6(Lambda) -> He-6 + pi(-) 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 H-6(Lambda) production rate times the two-body pi(-) weak decay branching ratio. The H-6(Lambda) binding energy with respect to H-5+ Lambda was determined jointly from production and decay to be B-Lambda = (4.0 +/- 1.1) MeV, assuming that H-5 is unbound with respect to H-3 + 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.)(+) -> I+ excitation. The consequences of this assignment to Lambda hypernuclear dynamics are briefly discussed.
First observation of the hyper superheavy hydrogen H-6(Lambda) / 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; 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; S. Piano; R. Rui; 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]
Titolo: | First observation of the hyper superheavy hydrogen H-6(Lambda) | |
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Data di pubblicazione: | 2012 | |
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Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.nuclphysa.2012.02.015 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/11583/2497935