High-spin states in the odd-proton I119,121 isotopes have been studied following heavy-ion fusion-evaporation reactions using boron and carbon beams. Both prolate (=0°) and oblate (=-60°) collective bands have been observed built on low-lying positive- and negative-parity proton states, namely, h11/2, g9/2, g7/2, and d5/2 orbitals. At the highest spins (39/2) the collective behavior of the h11/2 yrast band is seen to break down when noncollective oblate states become yrast, resulting in the observation of band termination. The terminating state involves the h11/2[g7/2]2[h11/2]2 configuration at =+60°.
ASJC Scopus subject areas
- Nuclear and High Energy Physics