Jagbir Singh

High spin states in116Te

The high spin states in116Te were populated in the Ru(19F,p4n) reaction at Elab=90MeV and the subsequent deexcitation was studied using the γ-ray spectroscopic techniques. Ninteen new transitions have been added to extend the level scheme. A ΔI=2 rotational band is identified for the first time in an even-A Tellurium nucleus.

High spin structures in119Te

The high spin states of119Te, populated in110Pd(13C,4n) and110Pd(12C,3n) reactions, have been studied through γ-ray spectroscopy. The level scheme has been established upto a spin of 55/2. Three-quasiparticle states, based on πg27/2⊗νh11/2 and πg7/2d5/2⊗νh11/2 configurations, have been identified. The 35/2 and 39/2 states are suggested to be the fully aligned states constituted by five valence νh11/23, μg7/2, πd5/2 quasiparticles.

A new band in doubly-odd118I

High spin states in118I, populated through105Pd(16O,p2n) and106Pd(16O,p3n) reactions, have been investigated through γ-ray spectroscopy. A new rotational-like structure, showing energy staggering in odd-even spin states, has been identified. This band, probably based on πg7/2⊗ vh11/2 configuration, exhibits competing noncollective behaviour above I=20 state. Recent assignment of this band to118Cs has been ruled out.

High spin states in121Te

High spin states of121Te, populated in the114Cd(11B,p3n) reaction, have been studied throughγ-ray spectroscopy. The level scheme has been established up toJπ=51/2−. Three-quasiparticle states, based on the πg7/22⊗νh11/2 andπg7/2d5/2⊗νh11/2 configurations, have been identified. A favoured 39/2− state is suggested to be the fully aligned [πg7/22]6+⊗[νh11/2327/2− yrast non-collective oblate configuration. This assignment is supported by Total Routhian Surface (TRS) calculations which also suggest a similar oblate assignment to the states atJπ=21/2− and 23/2−. A higher 47/2− state is also found and is suggested to be the fully aligned [πg7/22]6+⊗[νh11/25]35/2− configuration.

Band structures in doubly-odd120I nucleus

Two new collective bands have been identified in120I nucleus from the cross-bombardment results of108Pd(16O,p3n) and114Cd(11B,5n) reactions. Of these, a strongly coupled band, based on πg7/2 ⊗ υh11/2 quasiparticles, exhibits energy staggering in odd even spin states. The other band, based on πh11/2 ⊗ υg7/2 configuration, is decoupled in nature and shows a band-crossing at ħω=0.39 MeV due to alignment of an h11/2 quasineutron pair.