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Crossing the Dripline to 11N Using Elastic Resonance Scattering

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arxiv nucl-ex/0006011 v1 pith:KNNJKB63 submitted 2000-06-21 nucl-ex

K. Markenroth , L. Axelsson , S. Baxter , M. J. G. Borge , C. Donzaud , S. Fayans , H. O. U. Fynbo , V. Z. Goldberg
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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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keywords resonancegammabeenelasticexcitationfunctionscatteringspectrometer
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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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