Neutronin

Neutronin is not an established particle in the standard model of particle physics. The term is used primarily in speculative discussions and in science fiction to denote a hypothetical neutral particle with some similarities to the neutron but with different properties. Because there is no agreed-upon definition, the characteristics attributed to a neutronin vary widely between theories and narratives, and no experimental evidence currently confirms its existence.

In speculative contexts, a neutronin is often described as a neutral, possibly baryon‑like particle. Its mass may be close to that of a neutron or heavier, and its interactions are typically framed as weak or gravity-dominated, with uncertain or model-dependent participation in strong interactions. Some proposals treat it as a stable or long‑lived state, while others allow rapid decay into known particles. The concept is sometimes invoked to explore ideas about neutron-rich matter, hidden or dark sectors, or exotic nuclear processes, but these ideas remain conjectural without experimental verification.

Outside physics literature, neutronin also appears as a fictional element or device in science fiction, where it may serve as a fuel, energy carrier, or a means of enabling new technologies. In such uses, the properties of a neutronin are defined by the needs of the story rather than by empirical constraints.

In summary, neutronin is a peripheral, non‑established term. If encountered, it should be treated as speculative or fictional unless supported by peer‑reviewed research or credible sources. See also neutron, neutrino, and hypothetical particles.