Theoretical calculations predict a complex excited state (0+) for helium-4 (4He) at the 20.21 MeV energy level. This state involves a coupling of three cluster configurations: hydrogen-3 and a proton, ...

WEST LAFAYETTE, Ind. — The international collaborators of the ALPHA-2 experiment have measured the charge of antihydrogen to be zero with the greatest precision yet, narrowing the possibilities of ...

Isaac Newton's historic work on gravity was apparently inspired by watching an apple fall to the ground from a tree. But what about an "anti-apple" made of antimatter, would it fall in the same way if ...