The Magnetic Moment of the Second Excited State in ²⁶Al

Abstract

The magnetic moment of the 3⁺ second excited state at 417 keV in ²⁶Al has been determined by a time integral perturbed angular distribution method. This level was populated by the ²⁵Mg(p, γ)²⁶Al reaction at E_p=956 keV. An external field of 34.1 kOe was applied perpendicular to the reaction plane. The Larmor precession angle Δθ was derived from the difference of rotation angles between the angular distributions of the 417 keV and the 1650 keV γ-rays emitted in the reaction. The mean life of the 417 keV level was carefully remeasured to be τ=1.72±0.02 nsec. Combining the precession angle Δθ with the mean life τ the g-factor of this level was determined to be g=0.65±0.15. This value is consistent with both the shell model and the Nilsson model calculations.