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) / Agnello, Michelangelo; L., Benussi; M., Bertani; H. C., Bhang; G., Bonomi; E., Botta; M., Bregant; T., Bressani; Bufalino, Stefania; 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]

First observation of the hyper superheavy hydrogen H-6(Lambda)

AGNELLO, MICHELANGELO;BUFALINO, STEFANIA;
2012

Abstract

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2497935
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