Abstract
We report on the luminescence induced by positive muons implanted (with 4 MeV) into KBr crystal, which evidences a long-lived (lifetime=13.3 μs excited state produced by muon radiolysis. The temperature dependence of the luminescence yield has a strong correlation with the amplitude of an “anomalous” muonium center: both are observed only below ∼50 K. This correlation strongly suggests that the muonium center is perturbed by the muon-induced excitons to cause the anomalous hyperfine structure. Moreover, the luminescence energy and decay time indicate that the observed luminescence is not associated with the intrinsic or impurity-related self-trapped excitons, but with a relaxed excited state specific to the muon(ium)-KBr system.
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Kadono, R., Matsushita, A., Nishiyama, K. et al. Relaxed excited states and anomalous hyperfine structure of muonium centers in KBr. Hyperfine Interact 84, 271–277 (1994). https://doi.org/10.1007/BF02060674
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DOI: https://doi.org/10.1007/BF02060674