9 Quadrupole Moments of Neutron - Deficient 20 , 21
نویسندگان
چکیده
The electric-quadrupole coupling constant of the ground states of the proton drip line nucleus 20Na(Iπ = 2+, T1/2 = 447.9 ms) and the neutron-deficient nucleus 21Na(Iπ = 3/2+, T1/2 = 22.49 s) in a hexagonal ZnO single crystal were precisely measured to be |eqQ/h| = 690 ± 12 kHz and 939 ± 14 kHz, respectively, using the multi-frequency β-ray detecting nuclear magnetic resonance technique under presence of an electric-quadrupole interaction. A electric-quadrupole coupling constant of 27Na in the ZnO crystal was also measured to be |eqQ/h| = 48.4± 3.8 kHz. The electric-quadrupole moments were extracted as |Q(20Na)| = 10.3 ± 0.8 e fm2 and |Q(21Na)| = 14.0 ± 1.1 e fm2, using the electric-coupling constant of 27Na and the known quadrupole moment of this nucleus as references. The present results are well explained by shell-model calculations in the full sd-shell model space. Preprint submitted to Elsevier 8 January 2009
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