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Sommerfeld parameter : ウィキペディア英語版
Sommerfeld parameter
The Sommerfeld parameter is a dimensionless quantity used in nuclear astrophysics in the calculation of reaction rates between two nuclei and also appears in the definition of the astrophysical S-factor. It is defined as
: \eta = \frac ,
where is the elementary charge, and are the atomic numbers of two interacting nuclides, and is the magnitude of the relative incident velocity.
One of its best-known applications is in the exponent of the Gamow factor ,
: P = \exp(-2 \pi \eta) ,
which is the probability of an s-wave proton to penetrate the Coulomb barrier.
One of the first articles in which the Sommerfeld parameter appeared was published in 1967.
== References ==



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