Various Isomers in Doubly Odd I Isotopes

Abstract

Isomeric states (Isomers) in odd-odd120I,122I, and124I nuclei have been investigated using in- beam gamma-ray spectroscopy with the118Sn(6Li,4n),120Sn(7Li,5n), and122Sn(7Li,5n) reactions at Elab = 48, 58, and 54 MeV, respectively. Several isomers with half-lives ranging from a few nanoseconds to tens of microseconds have been identified for the first time and the absolute excited energies have been established by linking the low- and high-spin levels through the feeding and decay of the isomers in these nuclei. The properties of the isomers have been discussed in terms of spin traps and high-K isomerism based on two-quasiparticle configurations. The systematics for the absolute excitation energies of the Jπ = 7- and 8- high-K isomers based on the πg9/2⊗vh11/2 configuration are presented for116I to124I and compared with the 9/2+ states in the neighboring odd-A I isotopes. Show more