|
|||||
|
|
Coulomb excitation of radioactive 20, 21Na |
|
| Authors: | 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 Demand M 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 |
| Institution: | 1. Department of Physics, University of Guelph, N1G 2W1, Guelph, Ontario, Canada 2. Department of Physics and Astronomy, University of Rochester, 14627, Rochester, NY, USA 3. TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, British Columbia, Canada 4. Lawrence Livermore National Laboratory, 94551, Livermore, CA, USA 5. Department of Astronomy and Physics, Saint Mary’s University, B3H 3C3, Halifax, Nova Scotia, Canada 6. Department of Physics, University of Liverpool, L69 7ZE, Liverpool, UK 7. Department of Chemistry, Simon Fraser University, V5A 1S6, Burnaby, British Columbia, Canada 8. Department of Physics, North Carolina State University, 27695, Raleigh, NC, USA 9. Department of Physics, University of Toronto, M5S 1A7, Toronto, Ontario, Canada 10. Department of Physics, University of Arizona, 85721, Tucson, AZ, USA 11. Département de physique, Université de Montréal, Montréal, H3C 3J7, Québec, Canada 12. Département de physique de génie physique et d’optique, Université de Laval, Laval, G1V 0A6, Québec, Canada 13. Department of Physics and Astronomy, University of British Columbia, V6T 1Z1, British Columbia, Canada 14. Department of Physics, University of Surrey, GU2 7XH, Guildford, UK 15. Department of Physics and Astronomy, University of Kentucky, 40506-0055, Lexington, KY, USA 16. Physics Department, Colorado School of Mines, 80401, Golden, CO, USA 17. Department of Physics, McMaster University, L8S 4L8, Hamilton, Ontario, Canada |
| Abstract: | 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/cm^2 natTi target. Two TIGRESS HPGe clover detectors perpendicular to the beam axis were used for $ \gamma$ -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 ( $ \lambda$ L) values were determined using the 2+ $ \rightarrow$ 0+ de-excitation in 48Ti as a reference. The resulting B(E2) ↓ value for 21Na is 137±9 e^2fm^4, while the resulting B( $ \lambda$ L) ↓ values for 20Na are 55±6 e^2fm^4 for the 3+ $ \rightarrow$ 2+ , 35.7±5.7 e^2 fm^4 for the 4+ $ \rightarrow$ 2+ , and 0.154±0.030 μ_N^2 for the 4+ $ \rightarrow$ 3+ transitions. This analysis significantly improves the measurement of the 21Na B(E2) value, and provides the first experimental determination of B( $ \lambda$ L) values for the proton dripline nucleus 20Na .-1 |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |