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The coherent production of the nP states of the $\pi^+\pi^-$ atoms($A_{2\pi}$) in relativistic nucleus-nucleus collisions is considered as apossible source of the $A_{2\pi}(nP)$ beam for the pionium Lamb-shiftmeasurement. A general expression for estimation of the $A_{2\pi}(nP)$ yield isderived in the framework of the equivalent photon approximation.

Coherent production of the long-lived pionium nP states in relativistic nucleus-nucleus collisions