https://doi.org/10.1140/epja/s10050-022-00749-z
Regular Article - Theoretical Physics
Pygmy and isovector giant dipole resonance in 
Lu
Sakarya Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, 54050, Sakarya, Turkey
Received:
2
February
2022
Accepted:
13
May
2022
Published online:
2
June
2022
The isovector electric giant dipole (E1) resonance (IVGDR) in well-deformed odd-proton Lu is investigated using the Translational and Galilean Invariant-Quasiparticle Phonon Nuclear Model (TGI-QPNM) for the first time. E1 transition probabilities, radiation widths, photoabsorption cross-sections, and integrated moments (
, 
, 
, 
and 
) have been calculated up to 25 MeV using this model. The photoabsorption cross-section results show that 
K = 0 and K 
1 modes split in Lu due to large quadrupole deformation (prolate). Thus, a two-peak shape occurs, which is consistent with the available experimental data. The centroid energies and the widths of these peaks are also reproduced well. Besides, special attention is paid to the low-energy tail of GDR, particularly around the neutron separation energy, where an enhancement of electric dipole strength has been observed for many nuclei in recent years.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022
