With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sunrise created a co-production with a design studio formed by Hayao Miyazaki.
text_B: The Sommerfeld parameter , named after Arnold Sommerfeld , 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 .. Arnold Sommerfeld. Arnold Sommerfeld. nuclear astrophysics. nuclear astrophysics. nuclei. Atomic nucleus. S-factor. S-factor. It is defined as. where is the elementary charge , and are the atomic numbers of two interacting nuclides , is the magnitude of the relative incident velocity in the center-of-mass frame , is the unitless fine-structure constant , is the speed of light , and is the reduced mass of the two nuclides of interest .. elementary charge. elementary charge. velocity. velocity. fine-structure constant. fine-structure constant. reduced mass. reduced mass. One of its best-known applications is in the exponent of the Gamow factor -LRB- also known as the penetrability factor -RRB- ,. Gamow factor. Gamow factor. which is the probability of an s-wave nuclide to penetrate the Coulomb barrier , according to the WKB approximation .. s-wave. s-wave. Coulomb barrier. Coulomb barrier. This factor is particularly helpful in characterizing the nuclear contribution to low-energy nucleon-scattering cross-sections - namely , through the astrophysical S-factor .. S-factor. S-factor. One of the first articles in which the Sommerfeld parameter appeared was published in 1967 .
not_related.