Structure of the low-lying positive and negative parity states in even–even 144?154Nd isotopes

摘要

The low-lying positive and negative parity states of even–even 144?154Nd isotopes are studied using the interacting boson model (IBM). The negative parity states are involved within the IBM model by adding a single angular momentum (L = 3) boson with intrinsic negative parity f-boson to s and d-bosons model space. For these nuclei, the potential energy surfaces V (β,γ), transition probability B(E1), B(E2) and B(E3) are calculated. Phase transition from the U(5) limit to the SU(3) limit is observed in the chain and the critical point has been determined for 150Nd isotope. It is found that the calculated positive and negative parity energy spectra of Nd-isotopes agree well with the experimental data.