In a thermal reactor, 241Am captures a neutron to become americium-242, which quickly becomes curium-242 (or, 17.3% of the time, 242Pu) via beta decay.
In the context of a thermal reactor, 241Am absorbs a neutron to become americium-242, which then rapidly undergoes decay into either curium-242 or plutonium-242, depending on the specific circumstances.