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Crossing the Dripline to 11N Using Elastic Resonance Scattering

K. Markenroth, L. Axelsson, S. Baxter, M. J. G. Borge, C. Donzaud, S. Fayans, H. O. U. Fynbo, V. Z. Goldberg, S. Grevy, D. Guillemaud-Mueller, B. Jonson, K. -M. Kallman, S. Leenhardt, M. Lewitowicz, T. Lonnroth, P. Manngard, I. Martel, A. C. Mueller, I. Mukha, T. Nilsson, G. Nyman, N. A. Orr, K. Riisager, G. V. Rogachev, M. -G. Saint-Laurent, I. N. Serikov, N. B. Shul'gina, O. Sorlin, M. Steiner, O. Tengblad, M. Thoennessen, E. Tryggestad, W. H. Trzaska, F. Wenander, J. S. Winfield, R. Wolski

nucl-exarXiv:nucl-ex/0006011

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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