Creation of Electron-Positron Pairs in Photon-Photon Collisions Driven by 10-PW Laser Pulses

A novel approach is proposed to demonstrate the two-photon Breit-Wheeler process by using collimated and wide-bandwidth gamma-ray pulses driven by 10-PW lasers. Theoretical calculations suggest that more than 3.2 x 10(8) electron-positron pairs with a divergence angle of 7 degrees can be created per shot, and the signal-to-noise ratio is higher than 10(3). The positron signal, which is roughly 100 times higher than the detection limit, can be measured by using the existing spectrometers. This approach, which could demonstrate the e(-)e(+) pair creation process from two photons, would provide important tests for two-photon physics and other fundamental physical theories.