Study of the isospin character of 1-states using hadronic probes at intermediate energies

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Derya V. ; Endres J. ; Harakeh M.N. ; Savran D. ; Spieker M. ; Wörtche H.J. ; Zilges A. (2015)

The complementary (γ, γ′) and (α, α′γ) reactions were used to study the isospin properties of low-lying E1 excitations in the doubly-magic nucleus 48Ca. In contrast to heavier nuclei, a state-to-state change in isospin character was revealed in 48Ca and a dominant isoscalar excitation was found which is interpreted as an isoscalar oscillation. Recently, protons at 80 MeV were used as an additional hadronic probe in a p-γ coincidence experiment on 140Ce for the first time. Results of the experiments on 48Ca and first results of the 140Ce will be presented in this contribution. © Owned by the authors, published by EDP Sciences, 2015