NEUTRON-ANTINEUTRON OSCILLATION

The aim of this talk is to review the current status of and the future prospects for an experimental neutron-antineutron transition search. Traditional and new experimental techniques are discussed. In the n -- > (n) over bar search in experiments at existing reactors, it would be possible to increase the discovery potential up to four orders of mag nitude for vacuum n --> (n) over bar transitions relative to the exist ing experimental level or to achieve the limit of tau(<n(n)over bar>) greater than or equal to 10(10) s. With dedicated future reactors and ultimate experimental layout, it might be possible to reach the limit of 10(11)s. The progress in an intranuclear transition search expected to be made in the next decade by the SuperKamiokande and Icarus detec tors can be matched in an approach where long-lived isotopes in deep-m ined ores are searched.