Nuclear structure of N18 and the neighboring N=11 isotones

M. Wiedeking, P. Fallon, A. O. Macchiavelli, L. A. Bernstein, J. Gibelin, L. Phair, J. T. Harke, D. L. Bleuel, R. M. Clark, M-A. Deleplanque, S. Gros, R. Hatarik, H. B. Jeppesen, I-Y. Lee, B. F. Lyles, M. A. McMahan, L. G. Moretto, J. Pavan, E. Rodriguez-Vieitez, and A. Volya
Phys. Rev. C 77, 054305 – Published 5 May 2008

Abstract

The fusion-evaporation reaction Be9(B11,2p) was used to populate excited states in N18. New gamma-ray transitions were added to the N18 level scheme. The mean lifetime of the first excited state was measured to be 582(165) ps and its transition rate to the ground state was determined to be B(M1)=0.036(10) W.u. Shell model calculations in the full psd model space were used to investigate the low-lying configurations in N18 and in the N=11 isotones C17 and O19. It was found that the role of the proton-neutron interaction is important in determining the ground state and low-lying excited state properties. The ground state spin inversion in these isotones is attributed to the increased importance of the quadrupole relative to the pairing interaction and is discussed within the framework of a schematic pairing + quadrupole model.

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  • Received 29 June 2007

DOI:https://doi.org/10.1103/PhysRevC.77.054305

©2008 American Physical Society

Authors & Affiliations

M. Wiedeking1, P. Fallon1, A. O. Macchiavelli1, L. A. Bernstein2, J. Gibelin1, L. Phair1, J. T. Harke2, D. L. Bleuel2, R. M. Clark1, M-A. Deleplanque1, S. Gros1, R. Hatarik3, H. B. Jeppesen1, I-Y. Lee1, B. F. Lyles2,4, M. A. McMahan1, L. G. Moretto1,5, J. Pavan1, E. Rodriguez-Vieitez1,4, and A. Volya6

  • 1Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 3Rutgers University, Department of Physics and Astronomy, Piscataway, New Jersey 08854, USA
  • 4Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA
  • 5Department of Chemistry, University of California, Berkeley, California 94720, USA
  • 6Florida State University, Department of Physics, Tallahassee, Florida 32306, USA

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Vol. 77, Iss. 5 — May 2008

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