Coulomb excitation of radioactive 20, 21Na

M. A. Schumaker, D. Cline, G. Hackman, C. Pearson, C. E. Svensson, C. Y. Wu, A. Andreyev, R. A.E. Austin, G. C. Ball, D. Bandyopadhyay, J. A. Becker, A. J. Boston, H. C. Boston, L. Buchmann, R. Churchman, F. Cifarelli, R. J. Cooper, D. S. Cross, D. Dashdorj, G. A. DemandM. R. Dimmock, T. E. Drake, P. Finlay, A. T. Gallant, P. E. Garrett, K. L. Green, A. N. Grint, G. F. Grinyer, L. J. Harkness, A. B. Hayes, R. Kanungo, A. F. Lisetskiy, K. G. Leach, G. Lee, R. Maharaj, J. Martin, F. Moisan, A. C. Morton, S. Mythili, L. Nelson, O. Newman, P. J. Nolan, J. N. Orce, E. Padilla-Rodal, A. A. Phillips, M. Porter-Peden, J. J. Ressler, R. Roy, C. Ruiz, F. Sarazin, D. P. Scraggs, J. C. Waddington, J. M. Wan, A. Whitbeck, S. J. Williams, J. Wong

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The low-energy structures of the radioactive nuclei 20, 21Na have been examined using Coulomb excitation at the TRIUMF-ISAC radioactive ion beam facility. Beams of ~ 5×106 ions/s were accelerated to 1. 7MeV/A and Coulomb excited in a 0. 5mg/cm2natTi target. Two TIGRESS HPGe clover detectors perpendicular to the beam axis were used for γ-ray detection, while scattered nuclei were observed by the Si detector BAMBINO. For 21Na, Coulomb excitation from the 3/2+ ground state to the first excited 5/2+ state was observed, while for 20Na, Coulomb excitation was observed from the 2+ ground state to the first excited 3+ and 4+ states. For both beams, B (λL) values were determined using the 2+0 de-excitation in 48Ti as a reference. The resulting B(E2) ↓ value for 21Na is 137±9 e22fm4, while the resulting B(λL) ↓ values for 20Na are 55±6 e2fm4 for the 3+ → 2+, 35.7±5. 7 e2fm4 for the 4+ → 2+, and 0. 154±0. 030 μN2 for the 4+ → 3+ transitions. This analysis significantly improves the measurement of the 21Na B(E2) value, and provides the first experimental determination of B(λL) values for the proton dripline nucleus 20Na.-1

Original languageEnglish
Article number477
Pages (from-to)477-484
Number of pages8
JournalEuropean Physical Journal A
Issue number3
StatePublished - Dec 2009


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