학술논문
Shape changes in the mirror nuclei $^{70}$Kr and $^{70}$Se
Document Type
Working Paper
Author
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.
Source
Subject
Language
Abstract
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, $B(E2;\;0^+ \rightarrow 2^+)$. Comparison with the other members of the $A=70$ isospin triplet, $^{70}$Br and $^{70}$Se, studied in the same experiment, shows a $3\sigma$ 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.
Comment: accepted PRL
Comment: accepted PRL