Deformation dependence of the isovector giant dipole resonance: Theneodymium isotopic chain revisited
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Author list: Donaldson LM, Bertulani CA, Carter J, Nesterenko VO, von Neumann-Cosel P, Neveling R, Ponomarev VY, Reinhard PG, Usman IT, Adsley P, Brummer JW, Buthelezib EZ, Cooper GRJ, Fearick RW, Fortsch SV, Fujita H, Fujita Y, Jingo M, Kleinig W, Kureba CO, Kvasil J, Latif M, Li KCW, Mira JP, Nemulodi F, Papka P, Pellegri L, Pietralla N, Richter A, Sideras-Haddad E, Smit FD, Steyn GF, Swartz JA, Tamii A
Publisher: Elsevier
Place: AMSTERDAM
Publication year: 2018
Journal: Physics Letters B (0370-2693)
Journal acronym: PHYS LETT B
Volume number: 776
Start page: 133
End page: 138
Number of pages: 6
ISSN: 0370-2693
eISSN: 1873-2445
Languages: English-Great Britain (EN-GB)
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Abstract
Proton inelastic scattering experiments at energy E-p = 200MeVand a spectrometer scattering angle of 0 degrees were performed on Nd-144,Nd-146,Nd-148,Nd-150 and Sm-152 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, Nd-150 and Sm-152, 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. (C) 2017 The Authors. Published by Elsevier B.V.
Keywords
0(lab)=0 degrees, Comparison with photo-absorption results, E-p=200MeV, Nd-144,Nd-146,Nd-148,Nd-150, Sm-152(p, p '), Relativistic Coulomb excitation of the IVGDR, Transition from spherical to deformed nuclei
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