Fr.: énergie de parité
In nuclear physics, the extra binding energy associated with pairs of nucleons of the same kind. This quantity expresses the fact that nuclei with odd numbers of neutrons and protons have less energy and are less stable than those with even numbers of neutrons and protons.
pulsational pair-instability supernova
abar-now-axtar-e nâpâydâri-ye tapeši-ye joft
Fr.: supernova à instabilité pulsationnelle de paires
A → supernova resulting from the → pair instability that generates several successive explosions. According to models, a first pulse ejects many solar masses of hydrogen layers as a shell. After the first explosion, the remaining core contracts and searches for a stable burning state. When the next explosion occurs a few years later, several solar masses of material are again ejected, which collide with the earlier ejecta. This collision can radiate 1050 erg of light, about a factor of ten more than an ordinary → core-collapse supernova. After each pulse, the remaining core contracts, radiates neutrinos and light, and searches again for a stable burning state. Later ejections have lower mass, but have higher energy. They quickly catch up with the first shell, where the collision dissipates most of their kinetic energy as radiation. The first SNe from → Population III stars are likely due to pulsational pair instability (Woosley et al. 2007, Nature 450, 390). See also → pair-instability supernova.
1) darpinidan; 2) darpineš
Fr.: 1) réparer; 2) réparation
1) To restore or renew by any process of making good, strengthening, etc.
M.E. repairen, from O.Fr. reparer "repair, mend," from L. reparare "restore, put back in order," from → re- "again" + parare "make ready, prepare;" from PIE root *pere- "to produce."
Darpinidan, literally "patch up, mend," from (Dehxodâ) darpin "patch, bit, rag," variants darpi, darpé, piné "patch."
Fr.: air saturé