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Isospin dependence of electromagnetic transition strengths among an isobaric triplet
Univ Padua, Dipartimento Fis & Astron Galileo Galilei, I-35131 Padua, Italy;Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy;Natl Phys Lab, Hampton Rd, Teddington TW11 0LW, Middx, England.
Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England.
Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England.
Univ Padua, Dipartimento Fis & Astron Galileo Galilei, I-35131 Padua, Italy;Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.
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2019 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 797, article id UNSP 134835Article in journal (Refereed) Published
Abstract [en]

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. (C) 2019 The Author(s). Published by Elsevier B.V.

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ELSEVIER , 2019. Vol. 797, article id UNSP 134835
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Subatomic Physics
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URN: urn:nbn:se:uu:diva-395716DOI: 10.1016/j.physletb.2019.134835ISI: 000488071200023OAI: oai:DiVA.org:uu-395716DiVA, id: diva2:1365500
Funder
EU, FP7, Seventh Framework Programme, 262010Swedish Research Council, 2010-147Swedish Research Council, 2011-5253Swedish Research Council, 2011-6127Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved

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