Band structures in doubly-odd120I nucleus

Abstract

Two new collective bands have been identified in 12~ nucleus from the cross-bombardment results of wsPd (~60,p3n) and ll4Cd (IB,5n) nuclei. Such staggered and non-staggered collective bands have been established in the well-deformed odd-odd Cs [5] and La [6] nuclei. To further explore such staggered bands in nuclei in the vicinity of Z=50 closure, the high spin structures in odd-odd '2~ nucleus have been investigated.Excited states in 12~ were populated through the ~~ and n4Cd(nB,5n) reactions at 84 and 60 MeV respectively. The ion beams were delivered by the 16UD pelletron accelerator at Nuclear Science Centre, New Delhi. Isotopically enriched foils of ~~ (lmg/cm 2) and 114Cd (3mg/cm=) rolled on thick Pb backing were used as targets. Coincident ),-rays were detected with the GDA set-up comprising of eight Compton suppressed Ge detectors along with the multiplicity ball of fourteen BGO crystals. A total of 75 and 100 million Ge-Ge-BGO coincidences were recorded in these experiments respectively.The level scheme inferred from the present work is shown in figure 1. The placement of y-transitions is 2 (2t -) 12~l (16-)

High-Spin Level Scheme of 120 I

“…1. It is noted that the ordering of the 159 and 199 keV transitions below band G has been exchanged as compared with the result of Kaur et al [8,9] Band I1 is the most strongly populated band in our experiment. It was originally interpreted as being built on the 𝜋𝑔 7/2 ⊗ 𝜈ℎ 11/2 configuration.…”

“…Similar controversial assignment also exists in other odd-odd iodine nuclei [11] including 122 I, for which our conclusion [7] agrees with that of Moon et al Likewise, for the present case of 120 I, the 𝜋ℎ 11/2 ⊗ 𝜈ℎ 11/2 configuration assignment is again considered to be reasonable. Band I1 was reported by Kaur et al [8,9] up to the state de-excited by the 506 keV transition shown in Fig. 1.…”

“…In Refs. [8,9], Kaur et al reported three band structures from the same experiment. However, as stated in Ref.…”

“…It was originally interpreted as being built on the 𝜋𝑔 7/2 ⊗ 𝜈ℎ 11/2 configuration. [8,9] However, the later study by Moon et al [11,12] assigned it to the 𝜋ℎ 11/2 ⊗ 𝜈ℎ 11/2 configuration. Similar controversial assignment also exists in other odd-odd iodine nuclei [11] including 122 I, for which our conclusion [7] agrees with that of Moon et al Likewise, for the present case of 120 I, the 𝜋ℎ 11/2 ⊗ 𝜈ℎ 11/2 configuration assignment is again considered to be reasonable.…”

“…A 1052 keV transition was placed on the top of band I2 in Ref. [8]. However, it was in the later publication [9] of the same authors.…”