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  2. Decay theory - Wikipedia

    en.wikipedia.org/wiki/Decay_theory

    The Decay theory is a theory that proposes that memory fades due to the mere passage of time. Information is therefore less available for later retrieval as time passes and memory, as well as memory strength, wears away. [1] When an individual learns something new, a neurochemical "memory trace" is created.

  3. Fermi's interaction - Wikipedia

    en.wikipedia.org/wiki/Fermi's_interaction

    Fermi's Theory was the first theoretical effort in describing nuclear decay rates for β decay. The interaction could also explain muon decay via a coupling of a muon, electron-antineutrino, muon-neutrino and electron, with the same fundamental strength of the interaction. This hypothesis was put forward by Gershtein and Zeldovich and is known ...

  4. Societal collapse - Wikipedia

    en.wikipedia.org/wiki/Societal_collapse

    Societal collapse. Societal collapse (also known as civilizational collapse or systems collapse) is the fall of a complex human society characterized by the loss of cultural identity and of social complexity as an adaptive system, the downfall of government, and the rise of violence. [1] Possible causes of a societal collapse include natural ...

  5. Weak interaction - Wikipedia

    en.wikipedia.org/wiki/Weak_interaction

    In nuclear physics and particle physics, the weak interaction, also called the weak force is one of the four known fundamental interactions, with the others being electromagnetism, the strong interaction, and gravitation. It is the mechanism of interaction between subatomic particles that is responsible for the radioactive decay of atoms: The ...

  6. Alpha decay - Wikipedia

    en.wikipedia.org/wiki/Alpha_decay

    t. e. Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle ( helium nucleus) and thereby transforms or "decays" into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two. An alpha particle is identical to the nucleus of a helium-4 ...

  7. Radioactive decay - Wikipedia

    en.wikipedia.org/wiki/Radioactive_decay

    t. e. Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha, beta, and gamma decay.

  8. Beta decay - Wikipedia

    en.wikipedia.org/wiki/Beta_decay

    In nuclear physics, beta decay (β-decay) is a type of radioactive decay in which an atomic nucleus emits a beta particle (fast energetic electron or positron ), transforming into an isobar of that nuclide. For example, beta decay of a neutron transforms it into a proton by the emission of an electron accompanied by an antineutrino; or ...

  9. Particle decay - Wikipedia

    en.wikipedia.org/wiki/Particle_decay

    Particle decay. In particle physics, particle decay is the spontaneous process of one unstable subatomic particle transforming into multiple other particles. The particles created in this process (the final state) must each be less massive than the original, although the total mass of the system must be conserved.