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ENAM 98 Exotic Nuclei and Atomic Masses, Bellaire : États-Unis (1998)
Visualizing $^{11}$N by resonance reactions
L. Axelsson, K. Markenroth, M.J.G. Borge, S. Fayans, V.Z. Goldberg, S. Grevy1, D. Guillemaud-Mueller1, B. Jonson, K.M. Kallman, T. Lonnroth, M. Lewitowicz2, P. Mangard, I. Martel, A.C. Mueller1, I. Mukha, T. Nilsson, G. Nyman, N.A. Orr3, K. Riisager, G.V. Rogatchev, M.G. Saint-Laurent2, I.N. Serikov, O. Sorlin1, O. Tengblad, F. Wenander, J.S. Winfield3, R. Wolski

The proton-rich, unbound nucleus 11N has been studied using the technique of elastic resonance scattering in inverse geometry. The spins and parities of the three lowest resonance levels have been determined as 1/2+, 1/2− and 5/2+, resulting from the orbitals 1s1/2, 0p1/2 and 0d5/2, respectively. This level ordering is the same as the one found in the mirror nucleus of 11N, namely the one-neutron halo nucleus 11Be. Especially, the in 11Be well known level inversion, where the ground state is a 1/2+ intruder state below the from a naive shell model expected ground state 1/2−, is also found in 11N.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  GANIL - Grand Accélérateur National d'Ions Lourds
3 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
structure nucléaire
Physique/Physique Nucléaire Expérimentale