1. Narrowing of the neutron shell gap in 29Na
- Author
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Hurst, A.M., Wu, C.Y., Becker, J.A., Stoyer, M.A., Pearson, C.J., Hackman, G., Schumaker, M.A., Svensson, C.E., Austin, R.A.E., Ball, G.C., Bandyopadhyay, D., Barton, C.J., Boston, A.J., Boston, H.C., Churchman, R., Cline, D., Colosimo, S.J., Cross, D.S., Demand, G., and Djongolov, M.
- Subjects
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NUCLEAR shell theory , *SODIUM ions , *WAVE functions , *ELECTROMAGNETISM , *COULOMB excitation , *ION bombardment , *PARTICLE beams , *GAMMA ray spectrometer , *MONTE Carlo method - Abstract
Abstract: The wave-function composition for the low-lying states in 29Na was explored by measuring their electromagnetic properties using the Coulomb-excitation technique. A beam of 29Na ions, postaccelerated to 70 MeV, bombarded a 110Pd target with a rate of up to 600 particles per second at the recently commissioned ISAC-II facility at TRIUMF. Six segmented HPGe clover detectors of the TIGRESS γ-ray spectrometer were used to detect deexcitation γ rays in coincidence with scattered or recoiling charged particles in the segmented silicon detector, BAMBINO. The reduced transition matrix element in 29Na was derived to be 0.237(21) e b from the measured γ-ray yields for both projectile and target. This first-time measured value is consistent with the most recent Monte Carlo shell-model calculation, indicating a significant admixture of both sd and pf components in the wave function, and also providing evidence for the narrowing of the neutron shell gap from for stable nuclei to for 29Na. [Copyright &y& Elsevier]
- Published
- 2009
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