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• W2605608489 abstract "The low-lying unbound level structure of the halo nucleus $^{19}textrm{C}$ has been investigated using single-neutron knockout from $^{20}textrm{C}$ on a carbon target at 280 MeV/nucleon. The invariant mass spectrum, derived from the momenta of the forward going beam velocity $^{18}textrm{C}$ fragment and neutrons, was found to be dominated by a very narrow near threshold ($E_textrm{rel}$ = 0.036(1) MeV) peak. Two less strongly populated resonance-like features were also observed at $E_textrm{rel}$ = 0.84(4) and 2.31(3) MeV, both of which exhibit characteristics consistent with neutron $p$-shell hole states. Comparisons of the energies, measured cross sections and parallel momentum distributions to the results of shell-model and eikonal reaction calculations lead to spin-parity assignments of $5/2^+_1$ and $1/2^-_1$ for the levels at $E_x$ = 0.62(9) and 2.89(10) MeV with $S_n$ = 0.58(9) MeV. Spectroscopic factors were also deduced and found to be in reasonable accord with shell-model calculations. The valence neutron configuration of the $^{20}textrm{C}$ ground state is thus seen to include, in addition to the known $1s^2_{1/2}$ component, a significant $0d^2_{5/2}$ contribution. The level scheme of $^{19}textrm{C}$, including significantly the $1/2^-_1$ cross-shell state, is well accounted for by the YSOX shell-model interaction developed from the monopole-based universal interaction." @default.
• W2605608489 created "2017-04-28" @default.
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• W2605608489 date "2017-06-01" @default.
• W2605608489 modified "2023-10-15" @default.
• W2605608489 title "Single-neutron knockout from 20C and the structure of 19C" @default.
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