Pavel Golubev
Senior lecturer
Isospin dependence of electromagnetic transition strengths among an isobaric triplet
Author
Summary, in English
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.
Department/s
- Nuclear physics
Publishing year
2019-10-10
Language
English
Publication/Series
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume
797
Full text
- Available as PDF - 446 kB
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Document type
Journal article
Publisher
Elsevier
Topic
- Subatomic Physics
Status
Published
Project
- Nuclear Structure at the Limits: Isotope-selective Spectroscopy
- FAIR-NUSTAR: HISPEC-DESPEC experiment & Super-FRS contributions
ISBN/ISSN/Other
- ISSN: 0370-2693