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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..
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0003-1771-2656
Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
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.

Place, publisher, year, edition, pages
ELSEVIER , 2019. Vol. 797, article id UNSP 134835
National Category
Physical Sciences
Research subject
Physics, Nuclear Engineering
Identifiers
URN: urn:nbn:se:kth:diva-262774DOI: 10.1016/j.physletb.2019.134835ISI: 000488071200023Scopus ID: 2-s2.0-85070683080OAI: oai:DiVA.org:kth-262774DiVA, id: diva2:1363044
Note

QC 20191022

Available from: 2019-10-22 Created: 2019-10-22 Last updated: 2019-11-26Bibliographically approved

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