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Isospin dependence of electromagnetic transition strengths among an isobaric triplet

Boso, A.; Milne, S.A.; Bentley, M.A.; Recchia, F.; Lenzi, S.M.; Rudolph, D.; Labiche, M.; Pereira-Lopez, X.; Afara, S.; Ameil, F.; Arici, T.; Aydin, S.; Axiotis, M.; Barrientos, D.; Benzoni, G.; Birkenbach, B.; Boston, A.J.; Boston, H.C.; Boutachkov, P.; Bracco, A.; Bruce, A.M.; Bruyneel, B.; Cederwall, B.; Clement, E.; Cortes, M.L.; Cullen, D.M.; Désesquelles, P.; Dombràdi, Zs.; Domingo-Pardo, C.; Eberth, J.; Fahlander, C.; Gelain, M.; González, V.; John, P.R.; Gerl, J.; Golubev, P.; Górska, M.; Gottardo, A.; Grahn, T.; Grassi, L.; Habermann, T.; Harkness-Brennan, L.J.; Henry, T.W.; Hess, H.; Kojouharov, I.; Korten, W.; Lalović, N.; Lettmann, M.; Lizarazo, C.; Louchart-Henning, C.; Menegazzo, R.; Mengoni, D.; Merchan, E.; Michelagnoli, C.; Million, B.; Modamio, V.; Moeller, T.; Napoli, D.R.; Nyberg, J.; Nara Singh, B.S.; Pai, H.; Pietralla, N.; Pietri, S.; Podolyak, Zs.; Perez Vidal, R.M.; Pullia, A.; Ralet, D.; Rainovski, G.; Reese, M.; Reiter, P.; Salsac, M.D.; Sanchis, E.; Sarmiento, L.G.; Schaffner, H.; Scruton, L.M.; Singh, P.P.; Stahl, C.; Uthayakumaar, S.; Valiente-Dobón, J.J.; Wieland, O. (2019) Isospin dependence of electromagnetic transition strengths among an isobaric triplet. Physics Letters B, 797. 134835 ISSN 03702693

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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.

Item Type: Article
Keywords: Nuclear physics, gamma spectroscopy, Coulomb excitation
Subjects: Ionising Radiation > Radioactivity
Divisions: Environment
Identification number/DOI: 10.1016/j.physletb.2019.134835
Last Modified: 18 Dec 2019 14:54
URI: http://eprintspublications.npl.co.uk/id/eprint/8601

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