Coulomb excitation of the proton-dripline nucleus Na20

M. A. Schumaker, D. Cline, G. Hackman, C. J. 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. P. 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

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Abstract

The low-energy structure of the proton dripline nucleus Na20 has been studied using Coulomb excitation at the TRIUMF-ISAC radioactive ion beam facility. A 1.7-MeV/nucleon Na20 beam of ~5×106 ions/s was Coulomb excited by a 0.5-mg/cm2 natTi target. Scattered beam and target particles were detected by the BAMBINO segmented Si detector while γ rays were detected by two TIGRESS HPGe clover detectors set perpendicular to the beam axis. Coulomb excitation from the 2+ ground state to the first excited 3+ and 4+ states was observed, and B(λL) values were determined using the 2+→0+ de-excitation in Ti48 as a reference. The resulting B(λL) values are B(E2;3+→2+)=55±6 e2fm4 (17.0±1.9 W.u.), B(E2;4+→2+)=35. 7±5.7 e2fm4 (11.1±1.8 W.u.), and B(M1;4+→3+)=0.154±0. 030 μN2 (0.086±0.017 W.u.). These measurements provide the first experimental determination of B(λL) values for this proton dripline nucleus of astrophysical interest.

Original languageEnglish
Article number044325
JournalPhysical Review C - Nuclear Physics
Volume80
Issue number4
DOIs
StatePublished - Oct 22 2009

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