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Isospin properties of electric dipole excitations in 48Ca

Abstract : 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 (\alpha,\alpha'\gamma) experiment at E_{\alpha}=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.
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Contributor : Michel Lion <>
Submitted on : Tuesday, February 4, 2014 - 9:33:46 AM
Last modification on : Thursday, February 1, 2018 - 1:26:59 AM

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V. Derya, D. Savran, J. Endres, M.N. Harakeh, H. Hergert, et al.. Isospin properties of electric dipole excitations in 48Ca. Physics Letters B, Elsevier, 2014, 730, pp.288-292. ⟨10.1016/j.physletb.2014.01.050⟩. ⟨in2p3-00941569⟩



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