First observation of the hyper superheavy hydrogen 6ΛH

Abstract

Three candidate events of the neutron-rich hypernucleus 6ΛH were uniquely identified in the FINUDA experiment at DAΦNE, Frascati, by observing π+ mesons from the (K-stop,π+) production reaction on 6Li targets, in coincidence with π-mesons from 6ΛH \rightarrow 6He+π- weak decay. Details of the experiment and the analysis of its data are reported, leading to an estimate of (2.9\pm2.0)\cdot10-6/K- stop for the 6ΛH production rate times the two-body π- weak decay branching ratio. The 6ΛH binding energy with respect to 5H + Λ was determined jointly from production and decay to be BΛ = (4.0 \pm 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 \pm 0.74) MeV here assigned to the 0+g.s. \rightarrow 1+ excitation. The consequences of this assignment to Λ hypernuclear dynamics are briefly discussed.

20 pages, 8 figures, version matching published Nuclear Physics A manuscript

References in corpus (6)

• On tadpoles and vacuum redefinitions in String Theory
• Evidence for 6ΛH
• Hypernuclear spectroscopy with K${}^{-}$ at rest on ${}^7$Li, ${}^9$Be, ${}^{13}$C and ${}^{16}$O
• New results on Mesonic Weak Decay of $p$-shell $\Lambda$-Hypernuclei
• Proton spectra from Non-Mesonic Weak Decay of p-shell Lambda-Hypernuclei and evidence for the two-nucleon induced process
• Production of ${}_{\Lambda }^6$H and ${}_{\Lambda }^7$H with the (K${}_{stop}^{-}$,${\pi }^{+}$) reaction

Cited by in corpus (13)

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• Induced Hyperon-Nucleon-Nucleon Interactions and the Hyperon Puzzle
• Neutron-rich hypernuclei: Lambda-6H and beyond
• Hypernuclear No-Core Shell Model
• Four-body structure of neutron-rich hypernucleus ${}_{\Lambda }^6$H
• Production of hypernuclei in peripheral relativistic ion collisions
• Similarity renormalization group evolution of hypernuclear Hamiltonians
• Search for the neutron-rich hypernucleus 9ΛHe
• Experimental nuclear astrophysics in Italy
• SU(3) Approach to Hypernuclear Interactions and Spectroscopy
• Neutron Rich Hypernuclei in Chiral Soliton Model