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The Energy Dependence of the Electric Dipole Strength in Heavy Nuclei
A. R. Junghans,R. Beyer,G. Rusev,R. Schwengner,A. Wagner,E. Grosse 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We investigate on the basis of new photon scattering measurements and photoneutron and average neutron resonance capture data how well Lorentzians adjusted to photoneutron data in the giant dipole resonances give a good description of the photon strength also below the neutron threshold. If deformation effects are properly taken into account it is verified that down to about 4 MeV for various nuclei with A > 80 the previously employed differentiation between deformed and non-deformed nuclei is no longer necessary.
Isospin properties of electric dipole excitations in <sup>48</sup>Ca
Derya, V.,Savran, D.,Endres, J.,Harakeh, M.N.,Hergert, H.,Kelley, J.H.,Papakonstantinou, P.,Pietralla, N.,Ponomarev, V.Yu.,Roth, R.,Rusev, G.,Tonchev, A.P.,Tornow, W.,Wortche, H.J.,Zilges, A. North-Holland Pub. Co 2014 Physics letters: B Vol.730 No.-
Two different experimental approaches were combined to study the electric dipole strength in the doubly-magic nucleus <SUP>48</SUP>Ca below the neutron threshold. Real-photon scattering experiments using bremsstrahlung up to 9.9 MeV and nearly mono-energetic linearly polarized photons with energies between 6.6 and 9.51 MeV provided strength distribution and parities, and an (α,α<SUP>'</SUP>γ) experiment at E<SUB>α</SUB>=136MeV gave cross sections for an isoscalar probe. The unexpected difference observed in the dipole response is compared to calculations using the first-order random-phase approximation and points to an energy-dependent isospin character. A strong isoscalar state at 7.6 MeV was identified for the first time supporting a recent theoretical prediction.