New high-spin structure and possible chirality in In 109

The high-spin structure of In109 has been investigated with the Mo100(N14, 5n)In109 reaction at a beam energy of 78 MeV using the in-beam γ spectroscopic method. The level scheme of In109 has been modified considerably and extended by 46 new γ rays to the highest excited state at 8.980 MeV and Jπ=(45/2+). The new level scheme consists of eight bands, six of which are identified as dipole bands. The configurations have been tentatively assigned with the help of the systematics of neighboring odd-A indium isotopes and the experimental aligned angular momenta. The dipole bands are then compared with the titled axis cranking calculation in the framework of covariant density function theory. The results of theoretical calculations based on the configurations, which involve one proton hole at the g9/2 orbital and two or four unpaired neutrons at the g7/2, d5/2, and h11/2 orbitals, show that the shape of In109 undergoes an evolution on both β and γ deformations, and possible chirality is suggested in In109.