Triaxial nuclei and analytical solutions of the conformable fractional Bohr Hamiltonian with some exponential-type potentials

Abstract

New approximate analytical solutions have been obtained for the conformable fractional collective Bohr Hamiltonian suitable for triaxial nuclei, with the harmonic oscillator in γ-part of the collective potential and different exponential-type potentials (namely Morse, Tietz-Hua, and multi-parameter exponential-type potential) in β-part. The conformable fractional Nikiforov-Uvarov approach is used to derive closed analytical formulas for energy spectra and wave functions. The relation between the conformable fractional spectra of the three potentials and the Z(5) spectrum has been studied. The evolution of the energy spectra as a function of the potential parameters has been investigated for the three potentials. The normalized B(E2) transition rates and spectra have been calculated and compared with the experimental data and theoretical predictions of Kratzer potential. The predictions can describe well the experimental results for 114,116Pd, 126,128Xe, and 192,194Pt isotopes.