Abstract
Background: The Cd isotopes are well studied, but experimental data for the rare isotopes are sparse. At energies above the Coulomb barrier, higher states become accessible.
Purpose: Remeasure and supplement existing lifetimes and magnetic moments of low-lying states in 106Cd. Methods: In an inverse kinematics reaction, a 106Cd beam impinging on a 12C target was used to Coulomb excite the projectiles. The high recoil velocities provide a unique opportunity to measure g factors with the transient-field technique and to determine lifetimes from lineshapes by using the Doppler-shift-attenuation method. Large-scale shell-model calculations were carried out for 106Cd.
Results: The g factors of the 2+1 and 4+1 states in 106Cd were measured to be g(2+1 ) = +0.398(22) and g(4+1 ) = +0.23(5). A lineshape analysis yielded lifetimes in disagreement with published values. The new results are τ (106 Cd; 2+1 ) = 7.0(3) ps and τ (106 Cd; 4+1 ) = 2.5(2) ps. The mean life τ (106 Cd; 2+2 ) = 0.28(2) ps was determined from the fully-Doppler-shifted γ line. Mean lives of τ (106 Cd; 4+3 ) = 1.1(1) ps and τ (106 Cd; 3−1 ) = 0.16(1) ps were determined for the first time.
Conclusions: The newly measured g(4+1 ) of 106Cd is found to be only 59% of the g(2+1 ). This difference cannot be explained by either shell-model or collective-model calculations.
