]> Michel Dumontier 2.0 Dumontier Lab 2007-10-01 application/rdf+xml An ontology of pertaining to particle physics and their processes. Physics Ontology (primitive) en centrifugal force A force directed away from the centre of rotation. An influence that may cause a physical entity to accelerate. force frictional force A force that opposes the relative motion or tendency of such motion of two contacting surfaces. The force of attraction through bodies with mass. gravitational force An attractive or repulsive force that arises from the movement of electrical charge. magnetic force A radioactive decay in which the nucleus emits a smaller nucleus that is larger than an alpha particle. cluster decay A radioactive decay in which a nucleus emits two electrons and two antineutrinos. double beta decay double electron capture A radioactive decay in which a nucleus absorbs two orbital electrons and emits two neutrinos in which the daughter nucleus is left in an excited and unstable state. A radioactive decay in which a nucleus emits two positrons and two neutrinos. double positron emission double proton emission A radioactive decay in which two protons are simultaneously ejected from the nucleus. electron capture A radioactive decay in which a nucleus absorbs one orbital electron, emits one positron and two neutrinos. A reaction in which two nuclei join to form a heavier one. fission reaction A form of radioactive decay in which a nucleus, spontaneously or after absorbing additional light particles (usually neutrons), splits into two or sometimes three pieces. fusion reaction A radioactive decay in which only photons were involved in creating and destroying states of nuclear excitation. gamma decay internal conversion A radioactive decay in which an excited nucleus transfers energy to an orbital electron and it is ejected from the atom. neutron emission A radioactive decay in which a neutron is ejected from a nucleus. nuclear reaction A reaction in which atoms of one element are converted into atoms of another element. A radioactive decay in which a proton is ejected from a nucleus. proton emission radioactive decay A process in which an unstable atomic nucleus loses energy by emitting radiation in the form of particles or electromagnetic waves. spallation reaction A radioactive decay in which a nucleus is hit by a particle with sufficient energy and momentum to knock out several small fragments or, smash it into many fragments.