Shape changes in the mirror nuclei $^{70}$Kr and $^{70}$Se

K Wimmer, W Korten, P Doornenbal, T Arici, P Aguilera, A Algora, T Ando, H Baba, B Blank, A Boso, S Chen, A Corsi, P Davies, G de Angelis, G de France, J-P Delaroche, D T Doherty, J Gerl, R Gernhäuser, M GirodD Jenkins, S Koyama, T Motobayashi, S Nagamine, M Niikura, A Obertelli, J Libert, D Lubos, T R Rodríguez, B Rubio, E Sahin, T Y Saito, H Sakurai, L Sinclair, D Steppenbeck, R Taniuchi, R Wadsworth, M Zielinska

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We studied the proton-rich T_{z}=-1 nucleus ^{70}Kr through inelastic scattering at intermediate energies in order to extract the reduced transition probability, B(E2;0^{+}→2^{+}). Comparison with the other members of the A=70 isospin triplet, ^{70}Br and ^{70}Se, studied in the same experiment, shows a 3σ deviation from the expected linearity of the electromagnetic matrix elements as a function of T_{z}. At present, no established nuclear structure theory can describe this observed deviation quantitatively. This is the first violation of isospin symmetry at this level observed in the transition matrix elements. A heuristic approach may explain the anomaly by a shape change between the mirror nuclei ^{70}Kr and ^{70}Se contrary to the model predictions.

Original languageEnglish
Pages (from-to)072501
JournalPhysical Review Letters
Issue number7
Publication statusPublished - 19 Feb 2021

Bibliographical note

accepted PRL


  • nucl-ex
  • nucl-th

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