Definition

1. Noun:
   • A nuclear reaction in which a heavy atomic nucleus splits into two or more lighter nuclei, accompanied by the release of a significant amount of energy. This process is fundamental to nuclear power generation and atomic weapons.

Usage

• The term "nuclear fission" is used to describe the specific physical process that occurs within nuclear reactors and fission bombs.
• It is typically discussed in scientific, engineering, and energy policy contexts.

Examples

• Noun:
  • The reactor generates power through controlled nuclear fission.
  • The discovery of nuclear fission in 1938 was a pivotal moment in physics.
  • Energy is released during nuclear fission when uranium-235 nuclei split.

Advanced Usage

• "to undergo fission": This phrase describes the nucleus itself performing the action.
  • When a uranium-235 atom absorbs a neutron, it becomes unstable and undergoes fission.
• "fission reaction": A common collocation referring to the process or chain of events.
  • Controlling the rate of the fission reaction is critical for reactor safety.
• "spontaneous fission": A type of fission that occurs without an external trigger like a neutron.
  • Some heavy elements, like californium-252, decay via spontaneous fission.

Variants and Related Words

• Fission (n): The general act of splitting or breaking apart. In biology, it refers to cell division (e.g., binary fission). The term "nuclear fission" specifies the atomic process.
• Fissionable (adj): Describing a material capable of undergoing nuclear fission (e.g., uranium-235 is a fissionable isotope).
• Fissile (adj): Often used synonymously with "fissionable," but sometimes more specifically denotes materials that can sustain a chain reaction.
• Nuclear fusion (n): The opposite nuclear reaction, where light nuclei combine to form a heavier nucleus, releasing energy.

Synonyms

• Atomic fission: A less common but synonymous term.
• Nuclear splitting: A descriptive, non-technical synonym.

Related Phrases

• Chain reaction: A series of fission events where neutrons from one split nucleus trigger subsequent fissions.
  • A sustained nuclear chain reaction is necessary for a nuclear power plant to operate.
• Critical mass: The minimum amount of fissile material needed to maintain a nuclear chain reaction.
  • The scientists calculated the critical mass required for the fission experiment.
• Fission products: The lighter atomic fragments resulting from the split nucleus, which are often radioactive.
  • The safe containment of fission products is a major challenge in nuclear waste management.

Noun

1. a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy