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Liu, J. J.; Xu, X. X.; Sun, L. J.; Yuan, C. X.; Kaneko, K.; Sun, Y.; Liang, P. F.; Wu, H. Y.; Shi, G. Z.; Lin, C. J.; Lee, J.; Wang, S. M.; Qi, C.; Li, J. G.; Li, H. H.; Xayavong, Latsamy; Li, Z. H.; Li, P. J.; Yang, Y. Y.; Jian, H.; Gao, Y. F.; Fan, R.; Zha, S. X.; Dai, F. C.; Zhu, H. F.; Li, J. H.; Chang, Z. F.; Qin, S. L.; Zhang, Z. Z.; Cai, B. S.; Chen, R. F.; Wang, J. S.; Wang, D. X.; Wang, K.; Duan, F. F.; Lam, Y. H.; Ma, P.; Gao, Z. H.; Hu, Q.; Bai, Z.; Ma, J. B.; Wang, J. G.; Wu, C. G.; Luo, D. W.; Jiang, Y.; Liu, Y.; Hou, D. S.; Li, R.; Ma, N. R.; Ma, W. H.; Yu, G. M.; Patel, D.; Jin, S. Y.; Wang, Y. F.; Yu, Y. C.; Hu, L. Y.; Wang, X.; Zang, H. L.; Wang, K. L.; Ding, B.; Zhao, Q. Q.; Yang, L.; Wen, P. W.; Yang, F.; Jia, H. M.; Zhang, G. L.; Pan, M.; Wang, X. Y.; Sun, H. H.; Xu, H. S.; Zhou, X. H.; Zhang, Y. H.; Hu, Z. G.; Wang, M.; Liu, M. L.; Ong, H. J.; Yang, W. Q.
Physical review letters, 12/2022, Volume: 129, Issue: 24Journal Article
beta decay of proton-rich nuclei plays an important role in exploring isospin mixing. The beta decay of P-26 at the proton drip line is studied using double-sided silicon strip detectors operating in conjunction with high-purity germanium detectors. The T = 2 isobaric analog state (IAS) at 13 055 keV and two new high-lying states at 13 380 and 11 912 keV in Si-26 are unambiguously identified through beta-delayed two-proton emission (beta 2p). Angular correlations of two protons emitted from Si-26 excited states populated by P-26 beta decay are measured, which suggests that the two protons are emitted mainly sequentially. We report the first observation of a strongly isospin-mixed doublet that deexcites mainly via two-proton decay. The isospin mixing matrix element between the Si-26 IAS and the nearby 13 380-keV state is determined to be 130(21) keV, and this result represents the strongest mixing, highest excitation energy, and largest level spacing of a doublet ever observed in beta-decay experiments.
