Isospin dependence of electromagnetic transition strengths among an isobaric triplet

Abstract : Electric quadrupole matrix elements, Mp , for the Jπ=2+→0+ , ΔT=0 , T=1 transitions across the A=46 isobaric multiplet 46 Cr- 46 V- 46 Ti 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 46 Cr and 46 Ti; (ii) a “stretched target” technique was adopted here, for the first time, for lifetime measurements in 46 V and 46 Ti. A constant value of Mp 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.
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Submitted on : Wednesday, November 6, 2019 - 7:28:56 AM
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A. Boso, S.A. Milne, M.A. Bentley, F. Recchia, S.M. Lenzi, et al.. Isospin dependence of electromagnetic transition strengths among an isobaric triplet. Phys.Lett.B, 2019, 797, pp.134835. ⟨10.1016/j.physletb.2019.134835⟩. ⟨hal-02350394⟩

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