Evidence for core excitation in single-particle states of Na-19

M. G. Pellegriti, N. L. Achouri, C. Angulo, J. -C. Anglique, Alex Murphy, E Berhoumieux, E Casarejos, M Couder, Thomas Davinson, C. Ghag, N Orr, I Ray, I Stefan, P Descouvemont

Research output: Contribution to journalArticlepeer-review

Abstract

We present an experimental study of Na-19 states in the excitation energy range between 2 and 3 MeV. The presence of Na-19 single-particle levels at these energies was first predicted by a microscopic cluster model and then experimentally confirmed by measuring the elastic and inelastic scattering of a 66 MeV Ne-18 radioactive beam on a (CH2)(n) target. The H(Ne-18, p)Ne-18(g.s.) and H(Ne-18, p')Ne-18*(2(+), 1.887 MeV) cross sections have been obtained in the laboratory angular range theta(lab) = 6.1 degrees-18.4 degrees and analyzed by using the R-matrix method. Two new states in Na-19 have been observed at centre-of-mass energies E-c.m. = 2.78 +/- 0.01 MeV and 3.09 +/- 0.05 MeV. Both resonances exhibit large widths in the Ne-18(2(+)) + p channel, and low branching ratios into the elastic channel. The reduced proton widths confirm the single-particle nature of these states, with a Ne-18(2(+)) + p structure. (C) 2007 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)864-869
Number of pages6
JournalPhysics Letters B
Volume659
Issue number5
DOIs
Publication statusPublished - 7 Feb 2008

Keywords

  • elastic scattering
  • inelastic scattering
  • single-particle states
  • NUCLEI
  • MODEL

Cite this