Hyperfine interaction of 25Al in α-Al2O3 and its quadrupole moment
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Abstract
The electric quadrupole (Q) moment of short-lived nucleus 25Al \((I^{\pi} = 5/2^{+}, T_{1/2} = 7.18~{\rm s})\) has been measured for the first time, by means of the β-NQR technique. The spin polarization of 25Al was produced in heavy ion collisions and was kept in a α-Al2O3 single crystal for as long as 2 s and the quadrupole coupling frequency was obtained as ∣ eqQ / h(25Al in Al2O3) ∣ = (4.05 ±0.30) MHz. From the result, the Q moment was determined as ∣ Q(25Al)∣ = (240 ±20) mb. The present Q moment is larger by 30% than the shell model value of 184 mb, calculated by OXBASH code, which may show additional deformation of the nucleus.
Keywords
Nuclear moment β-NMR 25Al Al2O3 Relaxation timePreview
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