Marín-Lámbarri, Daniel JoséMukwevho, Ndinannyi JusticePesudo, VicenteRebeiro, BernadetteTriambak, Smarajit2026-05-272026-05-272026Pellegri, L., Jivan, H., Krugmann, A., Von Neumann-Cosel, P., Pietralla, N., Tamii, A., Adsley, P., Aoi, N., Bahini, A., Bertulani, C.A. and Brummer, J.W., 2026. Identification of the pygmy dipole resonance in a well deformed nucleus by combined isoscalar and isovector probes. Physics Letters B, p.140360.https://doi.org/10.1016/j.physletb.2026.140360https://hdl.handle.net/10566/22909The low-energy electric dipole response in the axially deformed 154Sm nucleus was investigated for the first time using complementary probes. The isoscalar (IS) response was extracted from an ( α, α ′ γ ) coincidence experiment and the isovector (IV) response from polarization observables measured with the (p→,p→′) reaction at 0∘. Both the IS and IV responses exhibit a resonance-like structure at excitation energies 5.5-6 MeV identified as the pygmy dipole resonance. Its evolution with deformation is investigated by comparison to the spherical isotope 144Sm. The low-energy IV strength in 154Sm departs from the K -splitting picture that characterizes the IV giant dipole resonance in this nucleus. This finding is further supported by the absence of significant IS strength above 7 MeV.en154SmDeformationIsospin characterLow-energy electric dipole excitationsPygmy dipole resonanceArticle