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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.