Free neutron decay: a review of the contemporary situation

Experimental data on neutron decay parameters are reviewed. These are the neutron lifetime and various angular correlations between spin and momenta of the particles involved in neutron decay. The restrictions on scalar and tensor terms in the weak Hamiltonian, as well as possible admixtures by V+A currents, resulting from neutron decay experiments, are discussed. Reasonable agreement with the predictions of the V−A theory can be certified.