Identification of a new low-lying state in the proton drip line nucleus Na-19
(2003) Physical Review C (Nuclear Physics) — Vol. 67, n° 1 (2003)
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- The second excited state (J(pi)=1/2(+), l=0) of the proton-rich nucleus Na-19 has been observed for the first time using the elastic scattering reaction H-1(Ne-18,H-1)Ne-18. An intense (4x10(6) pps) Ne-18 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-19 lies at the center-of-mass energy E-c.m.=1.066+/-0.003 MeV with respect to the Ne-18+p threshold, and has a proton width Gamma(p)=101+/-3 keV. The Coulomb shift between the 1/2(+) mirror levels in O-19 and Na-19 is 0.73 MeV, among the largest values currently observed in light exotic nuclei.
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Angulo, C., Tabacaru, G., Couder, M., Gaelens, M., Leleux, P., Ninane, A., Vanderbist, F., Davinson, T., Woods, PJ., Schweitzer, J., Achouri, N. L., Angelique, JC., Berthoumieux, E., Santos, F., Himpe, P., & Descouvemont, P. (2003). Identification of a new low-lying state in the proton drip line nucleus Na-19. Physical Review C (Nuclear Physics), 67(1). https://doi.org/10.1103/PhysRevC.67.014308 (Original work published 2003)