1. Magnetic moment and lifetime measurements of Coulomb-excited states in Cd106
- Author
-
Benczer-Koller, N, Kumbartzki, GJ, Speidel, K-H, Torres, DA, Robinson, SJQ, Sharon, YY, Allmond, JM, Fallon, P, Abramovic, I, Bernstein, LA, Bevins, JE, Crawford, HL, Guevara, ZE, Hurst, AM, Kirsch, L, Laplace, TA, Lo, A, Matthews, EF, Mayers, I, Phair, LW, Ramirez, F, and Wiens, A
- Subjects
Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Nuclear & Particles Physics - 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 Cd106. Methods: In an inverse kinematics reaction, a Cd106 beam impinging on a C12 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 Cd106. Results: The g factors of the 21+ and 41+ states in Cd106 were measured to be g(21+)=+0.398(22) and g(41+)=+0.23(5). A lineshape analysis yielded lifetimes in disagreement with published values. The new results are τ(Cd106;21+)=7.0(3)ps and τ(Cd106;41+)=2.5(2)ps. The mean life τ(Cd106;22+)=0.28(2)ps was determined from the fully-Doppler-shifted γ line. Mean lives of τ(Cd106;43+)=1.1(1)ps and τ(Cd106;31-)=0.16(1)ps were determined for the first time. Conclusions: The newly measured g(41+) of Cd106 is found to be only 59% of the g(21+). This difference cannot be explained by either shell-model or collective-model calculations.
- Published
- 2016