g-factor measurement of positive parity yrast band of ¹⁰⁸Cd

Background: The interplay between the collective rotation and the quasi-particle alignment is a significant feature of nuclear structure at high spins. The g-factors of intra-band high spin states of the ground rotational band can provide direct and unique information on quasi-particle alignment since the g-factors of the high-j proton and the high-j neutron are positively large and negatively small, respectively.

Purpose: The present work was motivated to measure g-factors of the rotational states of the positive parity yrast band in ¹⁰⁸Cd and to study the quasi-particle alignment.

Methods: High spin states of ¹⁰⁸Cd were populated by the fusion-evaporation reaction ⁷⁶Ge(³⁷Cl,1p4n)¹⁰⁸Cd at beam energy of 135 MeV from the HI-13 tandem accelerator at China Institute of Atomic Energy, and the g-factors were determined by the transient-magnetic filed-ion implantation perturbed angular distribution (TMF-IMPAD) method.

Results: The measured g-factors of 2⁺, 4⁺ state are 0.33(11), 0.18(6), respectively. The h_11/2 neutrons align at the 10⁺ state, which leads to the decrement of the g-factors. And the g_7/2 neutrons align gradually from 10⁺ to 16⁺, which makes the g-factors increase.

Conclusion: The g-factor of the bend head of the anti-magnetic rotation band, 16⁺ state, was measured and the value is -0.09(3).