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Phys. Rev. C 62, 034308 (2000) [12 pages]

Crossing the dripline to 11N using elastic resonance scattering

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K. Markenroth et al.
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Received 22 December 1999; published 16 August 2000

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/nucleon. 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 1.27-0.05+0.18 MeV (Γ=1.44±0.2 MeV), 2.01-0.05+0.15 MeV (Γ=0.84±0.2 MeV), and 3.75±0.05 MeV (Γ=0.60±0.05 MeV) with the spin-parity assignments Iπ=1 / 2+,1 / 2-,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-.


©2000 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.62.034308
DOI: 10.1103/PhysRevC.62.034308
PACS: 21.10.Hw, 21.10.Pc, 25.40.Ny, 27.20.+n

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