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Isospin dependence of electromagnetic transition strengths among an isobaric triplet

Boso, A.; Milne, S. A.; Bentley, M. A.; Recchia, F.; Lenzi, S. M.; Rudolph, D. LU ; Labiche, M.; Pereira-Lopez, X.; Afara, S. and Ameil, F., et al. (2019) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 797.
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... (More)

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.

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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
797
pages
6 pages
publisher
Elsevier
external identifiers
  • scopus:85070683080
ISSN
0370-2693
DOI
10.1016/j.physletb.2019.134835
language
English
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yes
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cbad1ab1-6e58-4389-9913-2af8121e65b7
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2019-09-01 16:20:27
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2019-09-17 04:59:43
@article{cbad1ab1-6e58-4389-9913-2af8121e65b7,
  abstract     = {<p>Electric quadrupole matrix elements, <i>M<sub>p</sub></i>, for the J<sup>π</sup>=2<sup>+</sup>→0<sup>+</sup>, <i>ΔT</i>=0, <i>T</i>=1 transitions across the <i>A</i>=46 isobaric multiplet <sup>46</sup>Cr-<sup>46</sup>V-<sup>46</sup>Ti 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 <i>M<sub>p</sub></i> with respect to <i>T<sub>z</sub></i>. Pairs of nuclei in the <i>T</i>=1 triplet were studied using identical reaction mechanisms in order to control systematic errors. The <i>M<sub>p</sub></i> values were obtained with two different methodologies: (i) a relativistic Coulomb excitation experiment was performed for <sup>46</sup>Cr and <sup>46</sup>Ti; (ii) a “stretched target” technique was adopted here, for the first time, for lifetime measurements in <sup>46</sup>V and <sup>46</sup>Ti. A constant value of <i>M<sub>p</sub></i> across the triplet has been observed. Shell-model calculations performed within the <i>fp</i> 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 <i>sd</i> shell. A test of the linearity rule for all published data on complete <i>T</i>=1 isospin triplets is presented.</p>},
  articleno    = {134835},
  author       = {Boso, A. and Milne, S. A. and Bentley, M. A. and Recchia, F. and Lenzi, S. M. and Rudolph, D. and Labiche, M. and Pereira-Lopez, X. and Afara, S. and Ameil, F. and Arici, T. and Aydin, S. and Axiotis, M. and Barrientos, D. and Benzoni, G. and Birkenbach, B. and Boston, A. J. and Boston, H. C. and Boutachkov, P. and Bracco, A. and Bruce, A. M. and Bruyneel, B. and Cederwall, B. and Clement, E. and Cortes, M. L. and Cullen, D. M. and Désesquelles, P. and Dombràdi, Zs and Domingo-Pardo, C. and Eberth, J. and Fahlander, C. and Gelain, M. and González, V. and John, P. R. and Gerl, J. and Golubev, P. and Górska, M. and Gottardo, A. and Grahn, T. and Grassi, L. and Habermann, T. and Harkness-Brennan, L. J. and Henry, T. W. and Hess, H. and Kojouharov, I. and Korten, W. and Lalović, N. and Lettmann, M. and Lizarazo, C. and Louchart-Henning, C. and Menegazzo, R. and Mengoni, D. and Merchan, E. and Michelagnoli, C. and Million, B. and Modamio, V. and Moeller, Th. and Napoli, D. R. and Nyberg, J. and Nara Singh, B. S. and Pai, H. and Pietralla, N. and Pietri, S. and Podolyak, Zs and Perez Vidal, R. M. and Pullia, A. and Ralet, D. and Rainovski, G. and Reese, M. and Reiter, P. and Salsac, M. D. and Sanchis, E. and Sarmiento, L. G. and Schaffner, H. and Scruton, L. M. and Singh, P.P. and Stahl, C. and Uthayakumaar, S. and Valiente-Dobón, J. J. and Wieland, O.},
  issn         = {0370-2693},
  language     = {eng},
  month        = {10},
  pages        = {6},
  publisher    = {Elsevier},
  series       = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {Isospin dependence of electromagnetic transition strengths among an isobaric triplet},
  url          = {http://dx.doi.org/10.1016/j.physletb.2019.134835},
  volume       = {797},
  year         = {2019},
}