The $\Delta I$=2 bands in ${}^{109}$In: possible antimagnetic rotation

Abstract

The high-spin structure of ${}^{109}$In was investigated with the ${}^{100}$Mo(${}^{14}$N, 5$n$)${}^{109}$In fusion-evaporation reaction at CIAE, Beijing. Eleven new $\gamma$-rays of ${}^{109}$In were identified, by which the bandheads of the $\Delta I$=2 rotational bands were confirmed. The configurations were assigned with the help of the systematic discussion. Furthermore, the rotational bands are compared with the tilted-axis cranking calculations based on a relativistic mean-field approach. The rotational bands involving the $1p1h$ excitation to the $\pi$$d_{5/2}$ and $\pi$$g_{7/2}$ orbitals are suggested as candidates for antimagnetic rotation based on the theoretical results.

10 pages, 9 figures,