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  2. Alpha particle - Wikipedia

    en.wikipedia.org/wiki/Alpha_particle

    Secondly, he found the charge-to-mass ratio of alpha particles to be half that of the hydrogen ion. Rutherford proposed three explanations: 1) an alpha particle is a hydrogen molecule (H 2) with a charge of 1 e; 2) an alpha particle is an atom of helium with a charge of 2 e; 3) an alpha particle is half a helium atom with a charge of 1 e.

  3. List of common physics notations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_physics...

    Meaning SI unit of measure alpha: alpha particle: angular acceleration: radian per second squared (rad/s 2) fine-structure constant: unitless beta: velocity in terms of the speed of light c: unitless beta particle: gamma: Lorentz factor: unitless photon: gamma ray: shear strain: radian

  4. Alpha decay - Wikipedia

    en.wikipedia.org/wiki/Alpha_decay

    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.

  5. Nuclear chemistry - Wikipedia

    en.wikipedia.org/wiki/Nuclear_chemistry

    Alpha decay is one type of radioactive decay, in which an atomic nucleus emits an alpha particle, and thereby transforms (or "decays") into an atom with a mass number decreased by 4 and atomic number decreased by 2.

  6. Fine-structure constant - Wikipedia

    en.wikipedia.org/wiki/Fine-structure_constant

    In physics, the fine-structure constant, also known as the Sommerfeld constant, commonly denoted by α (the Greek letter alpha), is a fundamental physical constant that quantifies the strength of the electromagnetic interaction between elementary charged particles.

  7. Helion (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Helion_(chemistry)

    The nucleus of the other (and far more common) stable isotope of helium, helium-4, consisting of two protons and two neutrons, is called an alpha particle or an alpha for short. This particle is the daughter product in the beta-minus decay of tritium, an isotope of hydrogen: [citation needed]

  8. Alpha-particle spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Alpha-particle_spectroscopy

    Alpha spectrometry (also known as alpha(-particle) spectroscopy) is the quantitative study of the energy of alpha particles emitted by a radioactive nuclide that is an alpha emitter. As emitted alpha particles are mono-energetic (i.e. not emitted with a spectrum of energies, such as beta decay ) with energies often distinct to the decay they ...

  9. Soft error - Wikipedia

    en.wikipedia.org/wiki/Soft_error

    Many of these bit-flips would probably be attributable to hardware problems, but some could be attributed to alpha particles. [1] These bit-flip errors may be taken advantage of by malicious actors in the form of bitsquatting. Isaac Asimov received a letter congratulating him on an accidental prediction of alpha-particle RAM errors in a 1950s ...