Theoretical investigation of giant dipole resonance in 146−152Nd isotopes with QRPA

Abstract

We investigate the electric dipole ([Formula: see text]) structure properties of the deformed [Formula: see text]Nd nuclei in the giant dipole resonance (GDR) region within the framework of the quasiparticle random-phase approximation (QRPA). Translational and Galilean invariance (TGI) QRPA with separable isovector dipole–dipole residual interaction have been employed for the calculations. We have computed the photoabsorption cross-section and then we have compared with the experimental data. Our calculations revealed that while the photoabsorption cross-section shows a Lorentzian line in the neighborhood of spherical geometry, it starts to shift to an asymmetric shape by increasing deformation in [Formula: see text]Nd isotopes by increasing neutron number. In addition to this, we have also observed that the splitting of the [Formula: see text] strength distribution and the separation between [Formula: see text] and [Formula: see text] branches are increasing. We have calculated the contribution of the electric and magnetic parts of total dipole strength up to 20[Formula: see text]MeV for the nuclei of interest. This calculation shows that the electric part dominates the total dipole strength and [Formula: see text] excitation dominates the electric part.

Study of the high lying electric dipole excitations in Odd-A 153–159Eu isotopes

“…In particular, the GDR mode has been observed in many even-even and odd-mass nuclei using (γ;xn), (γ;sn), (γ;γ′), (p;p'), and other reactions [6][7][8][9][10][11][12][13][14][15][16]. On the other hand, the GDR mode has been theoretically studied with Quasiparticle Phonon Model (QPM), Quasiparticle Random Phase Approximation (QRPA) and Relativistic Random Phase Approximation (RRPA), QRPA based on Gogny force, self-consistent QRPA, and Interaction Boson Model (IBM) in an even-even spherical, deformed, semi-magic, double magic nuclei [17][18][19][20][21][22][23][24][25]. Unlike with even-even nuclei, there has been the limited theoretical investigation of the GDR mode in odd-mass deformed nuclei [26].…”

Theoretical description of pygmy and giant dipole resonances in 237Np

“…Microscopic approximations play an essential role in satisfactorily describing the dipole excitations in the different energy regions mentioned above [36][37][38][39][40][41][42][43][44][45][46][47]. Random Phase Approximation (RPA) and Quasiparticle-RPA (QRPA) have been widely used to explain the properties of low-lying states and pygmy/giant dipole resonances.…”