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1 Introduction Theproblemofhowlongittakesparticlestotunnelthroughapotentialbarrierremainscontroversial,andavarietyofdefinitionshavebeenproposedforthetunnel ingtimeconcept[1~ 3 ].Animportantoneamongthoseisthephasetime (alsoknownasthegroupdelayintheli terat......