A team of scientists has for the first time measured the elusive weak interaction between protons and neutrons in the nucleus of an atom. They had chosen the simplest nucleus consisting of one neutron ...

Fifth force experiment: the cold neutron guide hall at NIST’s Center for Neutron Research in Maryland. (Courtesy: NIST/Yiming Qiu) An improved search for a potential fifth force of nature is one of a ...

An experiment to test a popular theory of dark energy has found no evidence of new forces, placing strong constraints on related theories. An experiment to test a popular theory of dark energy has ...

An atomic force microscope can be used as a single-electron current meter, according to new experiments by researchers at IBM. The technique, which measures the energy levels of single molecules on ...