%0 Journal Article
%T Isospin dependence of electromagnetic transition strengths among an isobaric triplet
%A Boso, A. et al
%A Domingo-Pardo, C.
%A Perez-Vidal, R. M.
%J Physics Letters B
%D 2019
%V 797
%I Elsevier
%@ 0370-2693
%G English
%F Boso_etal2019
%O WOS:000488071200023
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4158), last updated on Wed, 10 Apr 2024 12:49:25 +0000
%X Electric quadrupole matrix elements, M-p, for the J(pi) = 2(+) -> 0(+), Delta T = 0, T = 1 transitions across the A = 46 isobaric multiplet Cr-46-V-46-Ti-46 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 M-p with respect to T-z. Pairs of nuclei in the T = 1 triplet were studied using identical reaction mechanisms in order to control systematic errors. The M-p values were obtained with two different methodologies: (i) a relativistic Coulomb excitation experiment was performed for Cr-46 and Ti-46; (ii) a "stretched target" technique was adopted here, for the first time, for lifetime measurements in V-46 and Ti-46. A constant value of M-p across the triplet has been observed. Shell-model calculations performed within the fp 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.
%R 10.1016/j.physletb.2019.134835
%U https://doi.org/10.1016/j.physletb.2019.134835
%P 134835-6pp