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The Larmor precession of a relativistic neutral spin-1/2 particle in auniform constant magnetic field confined to the region of a one-dimensionalarbitrary potential barrier is investigated. The spin precession serves as aclock to measure the time spent by a quantum particle traversing a potentialbarrier. With the help of general spin coherent state it is explicitly shownthat the precession time is equal to the dwell time.Comment: 10 pages, 1 figure. To be published in Phys. Rev. A (01 February  2002

Larmor precession and tunneling time of a relativistic neutral spinning particle through an arbitrary potential barrier