Identification of a new low-lying state in the proton drip line nucleus Na

C. Angulo, G. Tabacaru, M. Couder, M. Gaelens, P. Leleux, A. Ninane, F. Vanderbist, T. Davinson, P.J. Woods, J.S. Schweitzer, N.L. Achouri, J.C. Angélique, E. Berthoumieux, F. De Oliveira Santos, P. Himpe, P. Descouvemont

Research output: Contribution to journalArticlepeer-review

Abstract

The second excited state (J = 1/2,, l = 0) of the proton-rich nucleus Na has been observed for the first time using the elastic scattering reaction H(Ne, H) Ne. An intense (4 × 10 pps) Ne radioactive beam was produced at the CRC-RIB facility at Louvain-la-Neuve to bombard a polyethylene target. The recoil protons were detected at 20 different angles in the LEDA segmented silicon detector. The resulting elastic scattering cross sections have been analyzed using a global R-matrix. fit. We find that the second excited state in Na lies at the center-of-mass energy E = 1.066±0.003 MeV with respect to the Ne+p threshold, and has a proton width Γ = 101±3 keV. The Coulomb shift between the 1/2 mirror levels in O and Na is 0.73 MeV, among the largest values currently observed in light exotic nuclei.
Original languageEnglish
Pages (from-to)143081-143084
Number of pages4
JournalPhysical Review C
Volume67
Issue number1
Publication statusPublished - 1 Jan 2003

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