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Crossing the dripline to $^{11}$N using elastic resonance scattering

Abstract : The level structure of the unbound nucleus 11N has been studied by 10C+p elastic resonance scattering in inverse geometry with the LISE3 spectrometer at GANIL, using a 10C beam with an energy of 9.0 MeV/u. An additional measurement was done at the A1200 spectrometer at MSU. The excitation function above the 10C+p threshold has been determined up to 5 MeV. A potential-model analysis revealed three resonance states at energies 1.27 (+0.18-0.05) MeV (Gamma=1.44 +-0.2 MeV), 2.01(+0.15-0.05) MeV, (Gamma=0.84 +-$0.2 MeV) and 3.75(+-0.05) MeV, (Gamma=0.60 +-0.05 MeV) with the spin-parity assignments I(pi) =1/2+, 1/2- and 5/2+, respectively. Hence, 11N is shown to have a ground state parity inversion completely analogous to its mirror partner, 11Be. A narrow resonance in the excitation function at 4.33 (+-0.05) MeV was also observed and assigned spin-parity 3/2-.
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Soumis le : mercredi 4 octobre 2000 - 11:11:13
Dernière modification le : mardi 19 février 2019 - 11:13:18

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K. Markenroth, L. Axelsson, S. Baxter, M.J.G. Borge, C. Donzaud, et al.. Crossing the dripline to $^{11}$N using elastic resonance scattering. Physical Review C, American Physical Society, 2000, 62, pp.034308-1-034308-12. ⟨10.1103/PhysRevC.62.034308⟩. ⟨in2p3-00006402⟩

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