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Crossing the dripline to N-11 using elastic resonance scattering

Karin Markenroth (Institutionen för experimentell fysik, Subatomär fysik) ; Leif Axelsson (Institutionen för experimentell fysik, Subatomär fysik) ; S. Baxter ; M. J. G. Borge ; C. Donzaud ; S. Fayans ; H. O. U. Fynbo ; V. Z. Goldberg ; S. Grevy ; D. Guillemaud-Mueller ; Björn Jonson (Institutionen för experimentell fysik, Subatomär fysik) ; K. M. Kallman ; S. Leenhardt ; M. Lewitowicz ; T. Lonnroth ; P. Manngard ; I. Martel ; A. C. Mueller ; I. Mukha ; Thomas Nilsson ; Göran Nyman (Institutionen för experimentell fysik, Subatomär fysik) ; 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 ; Fredrik Wenander ; J. S. Winfield ; R. Wolski
Physical Review C (0556-2813). Vol. 6203 (2000), 3,
[Artikel, refereegranskad vetenskaplig]

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-.

Nyckelord: alpha-cluster states, unbound nucleus n-11, one-neutron halo, low-lying levels, light-nuclei, be-11, spectroscopy, energies, widths, li-11

Denna post skapades 2010-10-21. Senast ändrad 2014-09-02.
CPL Pubid: 127919


Institutioner (Chalmers)

Institutionen för experimentell fysik, Subatomär fysik (1900-2005)



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