Gamma-ray spectroscopy of 126Ba

Competition between collective and noncollective excitation modes at high spin inBa124

“…8, shows an irregularity at ω = 0.63 MeV with an alignment gain of 2.5 , which is not seen in Band 1. In the yrast bands of the neighboring even-even nuclei 126 Ba [11] and 128 Ba [13] a similar behavior with alignment gains of ≈ 2 and ≈ 4 , respectively, has been observed. The alignment of a pair of protons of g 7/2 origin was suggested for the crossing around ω = 0.6 MeV in 126 Ba [11], whereas an alignment of a second pair of h 11/2 neutrons was proposed for the crossing at this frequency in 128 Ba [13].…”

“…It was suggested [10] that Band 3 (the favored signature) corresponds to the quasiproton eb configuration and Band 4 (the unfavored signature) to ea or ec. The πh 11/2 g 7/2 and π(h 11/2 d 5/2 ) ⊗ νh 4 11/2 configurations were also assigned to similar bands in the neighboring even-even nuclei 126 Ba [11] and 128 Ba [13], respectively. It was suggested [30,32,43] that those bands have a two-quasiproton structure mixed with the octupole vibrational band which accounts for the large signature splitting at low spins.…”

“…K tot = K 1 + λ K λ denotes the total K-value of the configuration. The values for the intrinsic g factors for the different orbitals, g λ , as well as the quadrupole moment, Q • = 3.9 b, have been taken from [11]. The shape parameter γ was set to zero.…”

Nuclear wobbling motion and electromagnetic transitions

“…Next we study the high-spin continuation of the γ band in 126 Ba. 37) This nucleus is also relatively γ-soft at low spins, while the first band crossing is caused by the low-Ω (πh 11/2 ) 2 in contrast to the isotone 124 Xe studied above. See Fig.6 of Ref.…”

Band structures inBa132

“…6128, Montreal, Quebec, Canada H3C 3J7. lower S band is attributed to the proton h»&2 configuration [12,13]. In the heavier Ba isotopes with decreasing quadrupole deformation and more negative y deformation, the neutron S band becomes favored.…”