학술논문
Deformation dependence of the isovector giant dipole resonance: The neodymium isotopic chain revisited
Document Type
article
Author
L.M. Donaldson; C.A. Bertulani; J. Carter; V.O. Nesterenko; P. von Neumann-Cosel; R. Neveling; V.Yu. Ponomarev; P.-G. Reinhard; I.T. Usman; P. Adsley; J.W. Brummer; E.Z. Buthelezi; G.R.J. Cooper; R.W. Fearick; S.V. Förtsch; H. Fujita; Y. Fujita; M. Jingo; W. Kleinig; C.O. Kureba; J. Kvasil; M. Latif; K.C.W. Li; J.P. Mira; F. Nemulodi; P. Papka; L. Pellegri; N. Pietralla; A. Richter; E. Sideras-Haddad; F.D. Smit; G.F. Steyn; J.A. Swartz; A. Tamii
Source
Physics Letters B, Vol 776, Iss C, Pp 133-138 (2018)
Subject
Language
English
ISSN
0370-2693
1873-2445
1873-2445
Abstract
Proton inelastic scattering experiments at energy Ep=200 MeV and a spectrometer scattering angle of 0° were performed on 144,146,148,150Nd and 152Sm exciting the IsoVector Giant Dipole Resonance (IVGDR). Comparison with results from photo-absorption experiments reveals a shift of resonance maxima towards higher energies for vibrational and transitional nuclei. The extracted photo-absorption cross sections in the most deformed nuclei, 150Nd and 152Sm, exhibit a pronounced asymmetry rather than a distinct double-hump structure expected as a signature of K-splitting. This behaviour may be related to the proximity of these nuclei to the critical point of the phase shape transition from vibrators to rotors with a soft quadrupole deformation potential. Self-consistent random-phase approximation (RPA) calculations using the SLy6 Skyrme force provide a relevant description of the IVGDR shapes deduced from the present data.