학술논문
Isospin dependence of electromagnetic transition strengths among an isobaric triplet
Document Type
Author
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, Th.; 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.
Source
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 797
Subject
Language
English
ISSN
0370-2693
Abstract
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.