Crossing the dripline to N-11 using elastic resonance scattering

K Markenroth, L Axelsson, S Baxter, Borge MJG, C Donzaud, S Fayans, Fynbo HOU, VZ Goldberg, S Grevy, D Guillemaud-Mueller, B Jonson, Kjell-Mikael Källman, S Leenhardt, M Lewitowicz, T Lonnroth, P Manngard, I Martel, AC Mueller, I Mukha, T NilssonG Nyman, NA Orr, K Riisager, GV Rogachev, MG Saint-Laurent, IN Serikov, NB Shul'gina, O Sorlin, M Steiner, O Tengblad, M Thoennessen, E Tryggestad, WH Trzaska, F Wenander, JS Winfield, R Wolski

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The level structure of the unbound nucleus N-11 has been studied by C-10+p elastic resonance scattering in inverse geometry with the LISE3 spectrometer at GANIL, using a C-10 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 C-10+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 (Gamma = 1.44 +/- 0.2 MeV), 2.01(-0.05)(+0.15) 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,-,5/2+, respectively. Hence, N-11 is shown to have a ground state parity inversion completely analogous to its mirror partner Be-11. A narrow resonance in the excitation function at 4.33 +/- 0.05 MeV was also observed and assigned spin parity 3/2-.
Original languageUndefined/Unknown
Pages (from-to)
Number of pages12
JournalPhysical Review C
Issue number3
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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