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Within the neutron-proton interacting boson model we study the population of mixed-symmetry states via α transfer processes. Closed expressions are deduced in the case of the limiting Uπ+ν(5) and SUπ+ν(3). We find that the population of the lowest mixed-symmetry 2+ state, vanishing along the Nπ=Nν line, depends on the number of active bosons and is normally smaller than that of the lowest full symmetric 2+ state. In particular, for deformed nuclei where the number of bosons is normally large, the relative population of the mixed-symmetry 2+ state is of the order of a few percent. More favorable cases can be found near shell closures, as in the case of α transfer leading to 140Ba.MEC FIS2005-0110

physical review c

Population of mixed-symmetry states via<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>α</mml:mi></mml:mrow></mml:math>transfer reactions

Population of mixed-symmetry states viaαtransfer reactions