25 April is reserved to Wolfgang Pauli
Today is the birthday of physicist Wolfgang Pauli, born in Vienna, Austria in 1900. His brilliance showed early, as he published a paper on the then-new theory of relativity at age 18. He received his doctorate from the University of Munich in 1921, just as quantum mechanics was being developed.
In 1925 Pauli proposed his famous exclusion principle, which states that no two electrons in an atom can be in the same state at the same time. In each electron-holding orbital, if one electron has spin +1/2, the other must have spin -1/2. The exclusion principle applies not only to electrons but to all fermions, which include protons and neutrons. Pauli later proposed the existence of electrically neutral particles called neutrinos; the particles were discovered in 1956, two years before his death. Pauli received the Nobel Prize in 1945 for his discovery of the exclusion principle.
Bio:
http://www.nobelprize.org/nobel_prizes/physics/laureates/1945/pauli-facts.html
#history #physics #neutrinos #Pauli
Il titille l'oreille qu'un "Principe d'exclusion" soit de "pas au lit" -- pourvu de ne pas prononcer la liaison.
ReplyDeleteCorina Marinescu, the history of quantum theory development is among my favorite topics. Pauli and Dirac where post-docs and Heisenberg had yet to receive his Ph.D. when they invented the 'kid physics' of quantum mechanics. They were all friends. Dirac was an atheist, and Pauli famously quipped, 'there is no God, and Dirac is his profit.'
ReplyDeleteDirac visto come Satana? Ha,ha,ha poverino, lo scherzo di Pauli era pesante.
ReplyDeleteBoris Borcic immagina due elettroni legati assieme dalla forza di gravità, il loro centro di massa sta percorrendo l'orbita attorno al nucleo, la gravitá è dovuta principalmente al loro moto di rotazione (velocità relativistiche) essendo opposto spin, la curvatura al loro interno (nel centro di massa) è maggiore della curvatura al loro esterno, ció vince la forza di repulsione elettrica. Se non fosse cosi un elettrone cadrebbe nel nucleo e l'altro verrebbe espulso ottenendo un atomo instabile. Quindi spin opposto è attrazione non repulsione. un pó come soffiare in mezzo a due strisce di carta.
ReplyDeleteVincenzo Sicari Dirac era ateo e quindi penso che non gli importava.....Do you speak both Italian and French?
ReplyDeleteErik Brown Ho studiato alla scuola media il francese, la lingua inglese alle scuole superiori.
ReplyDeleteAucune idée de ce que Satan vient faire là-dedans.
ReplyDeleteBoris Borcic ne vous inquiétez pas, sans doute est pas donné de connaître. 😄
ReplyDeleteJe m'attends au pire:)
ReplyDeletele pire il n'y a pas de fin! Boris Borcic
ReplyDeleteErik Brown tu sei un cuoco che fa il fisico o un matematico che viaggiando fa il cuoco? Sei di origini italiane e vivi in america, o sei un italiano prestato agli USA?
ReplyDeleteVincenzo Sicari Ha ha. I am not Italian, but my children are. I used to visit Itally quite often
ReplyDeleteErik Brown I understand But you did not answer: you are a cook who works as a physicist or a mathematician who traveling do cook?
ReplyDeleteVincenzo Sicari Yes, now I see. I'm a physicist for work and cooking for pleasure. However, both are the pleasure :)
ReplyDeleteVincenzo Sicari La fin du mot fin est négociable. Je "m'attendais au pire" ainsi qu'il "Satan au pire".
ReplyDeleteLe pire, quand à lui, n'est jamais certain,
...enfin, bien sûr, la mortalité fournit un au-delà dont il est permis de douter.
Boris Borcic La fin du mot fin il est non négociable! Il est n. La mortalité? Je ne suis pas d'accord tout dépend du médecin des la compétences scientifiques du docteur.
ReplyDeleteVincenzo Sicari La fin de tout mot que ce soit, est en définitive négociable. Mais passons.
ReplyDelete