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We study the quantum speed limit time (QSLT) of a coupled system consisting of a central spin and its surrounding environment, and the environment is described by a general XY spin-chain model. For initial pure state, we find that the local anomalous enhancement of the QSLT occurs near the critical point. In addition, we investigate the QSLT for arbitrary(More)
The combined analysis of the final event set of data on neutrino interactions inside the detector, upward going stopping muons and horizontal muons recorded in the Fr6jus experiment is presented. The absolute atmospheric neutrino spectra in the energy range 320 MeV < E~ < 30 GeV for electron neutrinos and 250 MeV< E,, < 10 TeV for muon neutrinos are(More)
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