Quadrupole Moment of Nb93 and Test of the Hyperfine Structure Formulas

概要

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The hyperfine structure (hfs) of the spectrum of Nb I was studied by means of a liquid-air-cooled hollow cathode discharge tube and a Fabry-Pérot etalon. The quadrupole moment of Nb93 was deduced to be −0.29 barn and −0.20 barn (1barn=10−24 cm2) from the levels 4d35s2 4F3⁄2 and 4d45s 6D3⁄2 respectively, in which no shielding correction is included. Assuming that the shielding correction in this case is zero, we get Q(Nb93)=−0.25±0.15 barn. The interval factors of the levels 4d35s2 4F3⁄2,5⁄2,7⁄2,9⁄2 and 4d45s 6D3⁄2,5⁄2,7⁄2,9⁄2 were measured and compared with hfs formulas, and a small but definite discrepancy was detected.
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