Boso, A.Milne, S. A.Bentley, M. A.Recchia, F.Lenzi, S. M.Rudolph, D.Labiche, M.Aydın, Sezgin2019-10-162019-10-1620190013-4835https://dx.doi.org/10.1016/j.physletb.2019.134835https://hdl.handle.net/20.500.12451/6854*Aydın, Sezgin ( Aksaray, Yazar )Electric quadrupole matrix elements, Mp, for the J? = 2+ ? 0+, T = 0, T = 1 transitions across the A = 46 isobaric multiplet 46Cr-46V-46Ti have been measured at GSI with the FRS-LYCCA-AGATA setup. This allows direct insight into the isospin purity of the states of interest by testing the linearity of Mp with respect to Tz . Pairs of nuclei in the T = 1 triplet were studied using identical reaction mechanisms in order to control systematic errors. The Mp values were obtained with two different methodologies: (i) a relativistic Coulomb excitation experiment was performed for 46Cr and 46Ti; (ii) a “stretched target” technique was adopted here, for the first time, for lifetime measurements in 46V and 46Ti. A constant value of Mp across the triplet has been observed. Shell-model calculations performed within the f p shell fail to reproduce this unexpected trend, pointing towards the need of a wider valence space. This result is confirmed by the good agreement with experimental data achieved with an interaction which allows excitations from the underlying sd shell. A test of the linearity rule for all published data on complete T = 1 isospin triplets is presented....eninfo:eu-repo/semantics/openAccessIsospin DependenceElectromagnetic Transition StrengthsArticle797-2610.1016/j.physletb.2019.134835N/AN/A