Shape Changes in the Mirror Nuclei ^{70}Kr and ^{70}Se

• Published in: Physical review letters Vol. 126; no. 7; p. 072501
• Main Authors: Wimmer, K, Korten, W, Doornenbal, P, Arici, T, Aguilera, P, Algora, A, Ando, T, Baba, H, Blank, B, Boso, A, Chen, S, Corsi, A, Davies, P, de Angelis, G, de France, G, Delaroche, J-P, Doherty, D T, Gerl, J, Gernhäuser, R, Girod, M, Jenkins, D, Koyama, S, Motobayashi, T, Nagamine, S, Niikura, M, Obertelli, A, Libert, J, Lubos, D, Rodríguez, T R, Rubio, B, Sahin, E, Saito, T Y, Sakurai, H, Sinclair, L, Steppenbeck, D, Taniuchi, R, Wadsworth, R, Zielinska, M
• Format: Journal Article
• Language: English
• Published: United States American Physical Society 19-02-2021
• Subjects: Nuclear Experiment; Nuclear Theory; Physics; Nuclear Physics
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.126.072501

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.