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  2. Delta ray - Wikipedia

    en.wikipedia.org/wiki/Delta_ray

    Fig. 2: A 3D representation of a delta electron knocked out by a 180 GeV muon, measured with a GridPix detector at the SPS at CERN. The colour indicates the height Otherwise called a knock-on electron, the term "delta ray" is also used in high energy physics to describe single electrons in particle accelerators that are exhibiting ...

  3. Delta baryon - Wikipedia

    en.wikipedia.org/wiki/Delta_baryon

    The Delta states discussed here are only the lowest-mass quantum excitations of the proton and neutron. At higher spins , additional higher mass Delta states appear, all defined by having constant ⁠ 3 / 2 ⁠ or ⁠ 1 / 2 ⁠ isospin (depending on charge), but with spin ⁠ 3 / 2 ⁠ , ⁠ 5 / 2 ⁠ , ⁠ 7 / 2 ⁠ , ..., ⁠ 11 / 2 ...

  4. List of common physics notations - Wikipedia

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

    Symbol Name Meaning SI unit of measure nabla dot the divergence operator often pronounced "del dot" per meter (m −1) nabla cross the curl operator often pronounced "del cross" per meter (m −1) nabla: delta (differential operator)

  5. Delta potential - Wikipedia

    en.wikipedia.org/wiki/Delta_potential

    The delta potential is the potential = (), where δ(x) is the Dirac delta function. It is called a delta potential well if λ is negative, and a delta potential barrier if λ is positive. The delta has been defined to occur at the origin for simplicity; a shift in the delta function's argument does not change any of the following results.

  6. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.

  7. Wave function - Wikipedia

    en.wikipedia.org/wiki/Wave_function

    In quantum physics, a wave function (or wavefunction) is a mathematical description of the quantum state of an isolated quantum system. The most common symbols for a wave function are the Greek letters ψ and Ψ (lower-case and capital psi, respectively). Wave functions are complex-valued. For example, a wave function might assign a complex ...

  8. Dirac delta function - Wikipedia

    en.wikipedia.org/wiki/Dirac_delta_function

    The delta function was introduced by physicist Paul Dirac, and has since been applied routinely in physics and engineering to model point masses and instantaneous impulses. It is called the delta function because it is a continuous analogue of the Kronecker delta function, which is usually defined on a discrete domain and takes values 0 and 1.

  9. Partial charge - Wikipedia

    en.wikipedia.org/wiki/Partial_charge

    In atomic physics, a partial charge (or net atomic charge) is a non-integer charge value when measured in elementary charge units. It is represented by the Greek lowercase delta (𝛿), namely 𝛿− or 𝛿+. Partial charges are created due to the asymmetric distribution of electrons in chemical bonds.