Isospin dependence of electromagnetic transition strengths among an isobaric triplet

A. Boso, S. A. Milne, M. A. Bentley, F. Recchia, S. M. Lenzi, D. Rudolph, M. Labiche, X. Pereira-Lopez, S. Afara, F. Ameil, T. Arici, S. Aydin, M. Axiotis, D. Barrientos, G. Benzoni, B. Birkenbach, A. J. Boston, H. C. Boston, P. Boutachkov, A. BraccoA. M. Bruce, B. Bruyneel, B. Cederwall, E. Clement, M. L. Cortes, D. M. Cullen, P. Désesquelles, Zs Dombràdi, C. Domingo-Pardo, J. Eberth, C. Fahlander, M. Gelain, V. González, P. R. John, J. Gerl, P. Golubev, M. Górska, A. Gottardo, T. Grahn, L. Grassi, T. Habermann, L. J. Harkness-Brennan, T. W. Henry, H. Hess, I. Kojouharov, W. Korten, N. Lalović, M. Lettmann, C. Lizarazo, C. Louchart-Henning, R. Menegazzo, D. Mengoni, E. Merchan, C. Michelagnoli, B. Million, V. Modamio, T. Moeller, D. R. Napoli, J. Nyberg, B. S. Nara Singh, H. Pai, N. Pietralla, S. Pietri, Zs Podolyak, R. M. Perez Vidal, A. Pullia, D. Ralet, G. Rainovski, M. Reese, P. Reiter, M. D. Salsac, E. Sanchis, L. G. Sarmiento, H. Schaffner, L. M. Scruton, P. P. Singh, C. Stahl, S. Uthayakumaar, J. J. Valiente-Dobón, O. Wieland

    Research output: Contribution to journalArticlepeer-review


    Electric quadrupole matrix elements, Mp, for the Jπ=2+→0+, ΔT=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 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.

    Original languageEnglish
    Article number134835
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Publication statusPublished - 13 Aug 2019

    Bibliographical note

    © 2019 TheAuthor(s). Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAPU3.


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