TY - JOUR A1 - Derya, Vera A1 - Savran, Deniz A1 - Endres, Janis A1 - Harakeh, Muhsin N. A1 - Hergert, Heiko A1 - Kelley, John A1 - Papakonstantinou, Panagiota A1 - Pietralla, Norbert A1 - Ponomarev, Vladimir Yu. A1 - Roth, Robert A1 - Rusev, Gencho Y. A1 - Tonchev, Anton P. A1 - Tornow, Werner A1 - Wörtche, Heinrich A1 - Zilges, Andreas T1 - Isospin properties of electric dipole excitations in ⁴⁸Ca T2 - Physics Letters B N2 - Two different experimental approaches were combined to study the electric dipole strength in the doubly-magic nucleus 48Ca 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' γ) experiment at Eα = 136 MeV 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. KW - Low-lying electric dipole excitations KW - 48Ca KW - Isospin character Y1 - 2014 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/77044 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-770449 SN - 0370-2693 VL - 730 SP - 288 EP - 292 PB - Elsevier CY - Amsterdam ER -