Abstract
A systematic study of ground state spectrum with the triaxial deformation γ for odd-A Iodine isotopes 109−117I is carried out with the nonadiabatic quasiparticle approach. The rotation-particle coupling is accomplished microscopically such that the matrix elements of a particle-plus-rotor system are written in terms of the rotor energies. The 5/2+ state is confirmed as ground state for odd-A 111−117I and also coming out as lowest in energy for 109I.
Highlights
Iodine with Z = 53 lies in the transitional region between near-spherical Sn (Z = 50) and deformed Ce (Z = 58) nuclei
Ground state structure of odd-A Iodine isotopes (109−117I) from the proton drip line to the region near the β-stability line are analysed in this work with the microscopic nonadiabatic quasiparticle approach
Study of Iodine chain is important to see the effect of a successive increment of neutron numbers on the shape of the isotopes. 109I is a ground state proton emitter and well studied in Refs. [1, 2]
Summary
Iodine with Z = 53 lies in the transitional region between near-spherical Sn (Z = 50) and deformed Ce (Z = 58) nuclei. The transitional nuclei exhibit many interesting phenomena like shape coexistence, triaxiality, rapid variation in shape with changing proton and neutron number, band crossing, etc. Ground state structure of odd-A Iodine isotopes (109−117I) from the proton drip line to the region near the β-stability line are analysed in this work with the microscopic nonadiabatic quasiparticle approach. The deformed shell model predicts that the odd proton lies in the d5/2 and g7/2 orbitals near the Fermi level [3]. These states are coupled to the states of the corresponding even-even core to study the rotational bands
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