TY - JOUR
T1 - Isospin dependence of electromagnetic transition strengths among an isobaric triplet
AU - AGATA@GSI Collaboration
AU - Boso, A.
AU - Milne, S. A.
AU - Bentley, M. A.
AU - Recchia, F.
AU - Lenzi, S. M.
AU - Rudolph, D.
AU - Labiche, M.
AU - Pereira-Lopez, X.
AU - Afara, S.
AU - Ameil, F.
AU - Arici, T.
AU - Aydin, S.
AU - Axiotis, M.
AU - Barrientos, D.
AU - Benzoni, G.
AU - Birkenbach, B.
AU - Boston, A. J.
AU - Boston, H. C.
AU - Boutachkov, P.
AU - Bracco, A.
AU - Bruce, A. M.
AU - Bruyneel, B.
AU - Cederwall, B.
AU - Clement, E.
AU - Cortes, M. L.
AU - Cullen, D. M.
AU - Désesquelles, P.
AU - Dombràdi, Zs
AU - Domingo-Pardo, C.
AU - Eberth, J.
AU - Fahlander, C.
AU - Gelain, M.
AU - González, V.
AU - John, P. R.
AU - Gerl, J.
AU - Golubev, P.
AU - Górska, M.
AU - Gottardo, A.
AU - Grahn, T.
AU - Grassi, L.
AU - Habermann, T.
AU - Harkness-Brennan, L. J.
AU - Henry, T. W.
AU - Hess, H.
AU - Kojouharov, I.
AU - Korten, W.
AU - Lalović, N.
AU - Lettmann, M.
AU - Scruton, L. M.
AU - Uthayakumaar, S.
N1 - © 2019 The Author(s).
PY - 2019/10/10
Y1 - 2019/10/10
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85070683080&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2019.134835
DO - 10.1016/j.physletb.2019.134835
M3 - Article
AN - SCOPUS:85070683080
SN - 0370-2693
VL - 797
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
M1 - 134835
ER -