Multiple Shape Coexistence in Cd110,112

Onset of triaxial deformation in Zn66 and properties of its first excited 0+ state studied by means of Coulomb excitation

“…However, while the energies of the 2 1 + , 2 2 + , and 4 1 + states evolve slowly and smoothly as a function of the neutron number, the 0 2 + state follows a different pattern, with a much more rapid decrease of its excitation energy from 62 Zn to 70 Zn, interrupted by a sudden jump observed for 66 Zn. The vibrational interpretation definitely fails when other electromagnetic properties are taken into account, such as transition probabilities and quadrupole moments, similar to what was found for instance in the Cd isotopes [11,12]. Quasirotational K = 0 and K = 2 bands were suggested in 64 Zn and 66 Zn, based on the enhanced in-band transitions (i.e., 6 1 + → 4 1 + → 2 1 + and 6 2 + → 4 2 + → 2 2 + ) and weak intraband transitions [13,14].…”

“…In order to disentangle their individual contributions, the subdivision of the experimental data with respect to the projectile scattering angle was performed. Eight different angular ranges could be selected thanks to the SPIDER segmentation: 123.5-127.5 The target thickness was precisely determined from the online particle spectra acquired with the SPIDER array, resulting in d = 0.616 (11) mg/cm 2 [23]. A similar result [d = 0.640(30) mg/cm 2 ] was obtained in an independent measurement performed at the INFN LABEC laboratory in Florence [24] using the Rutherford back-scattering technique.…”

Shape coexistence and multiparticle-multihole structures in Cd110,112

“…In the present work, which expands on the details given in Ref. [9], evidence is presented suggesting that 110,112 Cd have low-lying 0 + states that possess different shapes.…”

“…The newly observed transitions are indicated, and the levels are organized into sequences as proposed in Ref. [9] and are labeled as the ground-state band, the intruder band for the ∆I = 2 sequence built on the 0 + 2 level, the γ band for the ∆I = 1 sequence built on the 2 + 2 state, and the intruder γ band for the ∆I = 1 sequence built on the 2 + 4 state at 2288 keV. (We use the traditional nomenclature "intruder" and "γ" as labels for these excitations, independent of their precise natures.)…”

Emerging nuclear collectivity in 124−130Te

“…They can be compared to the Cd isotopes (Z=48) with two proton holes, which have been more extensively studied. There is an ongoing discussion on the nature of the collectivity that, in the Cd isotopes, is traditionally associated with anharmonic vibrations [1][2][3][4][5][6].…”