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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
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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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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. 2000-06-21. Crossing the Dripline to 11N Using Elastic Resonance Scattering. https://doi.org/10.1103/physrevc.62.034308

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