We explored a distinct mechanism for matter creation via electron-positron pair production during bound-bound transitions in the deexcitation of muonic atoms.For ions with nuclear charges Z≥24,transitions from low-ly...We explored a distinct mechanism for matter creation via electron-positron pair production during bound-bound transitions in the deexcitation of muonic atoms.For ions with nuclear charges Z≥24,transitions from low-lying excited states to the 1s-muon state can lead to the production of electron-positron pairs.We show that the Breit interaction determines the transition probabilities for states with nonzero orbital momentum.We show that the pair production arises mainly from the decay of the 2p states.Thus,the Breit interaction governs electron-positron pair production in bound-bound muon transitions.This process offers a unique opportunity to explore quantum electrodynamics in strong fields,as well as a class of nonradiative transitions involving electron-positron pair production.展开更多
Carbon-based single-atom nanozymes(C-SANzymes),characterized by M-N_(x)active sites,have garnered significant attention as promising enzyme mimics[1].A critical approach for enhancing the catalytic performance of thes...Carbon-based single-atom nanozymes(C-SANzymes),characterized by M-N_(x)active sites,have garnered significant attention as promising enzyme mimics[1].A critical approach for enhancing the catalytic performance of these nanozymes involves the precise regulation of the coordination environment surrounding the metal atoms.For instance,introducing alternative elements to replace coordination N and create asymmetric coordination centers has been demonstrated to improve catalytic performance[2,3].展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2022YFA1602501)the National Natural Science Foundation of China(Grant No.12011530060)+1 种基金supported solely by the Russian Science Foundation(Grant No.22-12-00043)supported by the Chinese Academy of Sciences(CAS)Presidents International Fellowship Initiative(PIFI)(Grant Nos.2018VMB0016 and 2022VMC0002),respectively。
文摘We explored a distinct mechanism for matter creation via electron-positron pair production during bound-bound transitions in the deexcitation of muonic atoms.For ions with nuclear charges Z≥24,transitions from low-lying excited states to the 1s-muon state can lead to the production of electron-positron pairs.We show that the Breit interaction determines the transition probabilities for states with nonzero orbital momentum.We show that the pair production arises mainly from the decay of the 2p states.Thus,the Breit interaction governs electron-positron pair production in bound-bound muon transitions.This process offers a unique opportunity to explore quantum electrodynamics in strong fields,as well as a class of nonradiative transitions involving electron-positron pair production.
基金supported by the National Natural Science Foundation of China(52472284,52225406,12374253,and 12374174)。
文摘Carbon-based single-atom nanozymes(C-SANzymes),characterized by M-N_(x)active sites,have garnered significant attention as promising enzyme mimics[1].A critical approach for enhancing the catalytic performance of these nanozymes involves the precise regulation of the coordination environment surrounding the metal atoms.For instance,introducing alternative elements to replace coordination N and create asymmetric coordination centers has been demonstrated to improve catalytic performance[2,3].
