Isolated attosecond <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>-ray pulse generation with transverse orbital angular momentum using intense spatiotemporal optical vortex lasers

Isolated attosecond \ensuremath{\gamma}-ray pulses carrying transverse orbital angular momentum (TOAM) are pivotal for research in nuclear physics and quantum electrodynamics, but their production is challenging. This study uses a single spatiotemporal-optical-vortex laser to select and accelerate a 300-attosecond electron slice with TOAM, which collides with a reflected laser front to trigger nonlinear Compton scattering, producing a collimated, ultrabrilliant isolated \ensuremath{\gamma}-ray pulse. Such isolated pulses with TOAM will enable time-resolved nuclear detection, angular-momentum-sensitive photonuclear reactions, and multiple analyses in nuclear physics.