onsdag 17. desember 2014

Number 16&17...

Again I didn´t manage to make the calendar blogpost yesterday - and again I´m very sorry :/ Again I give you two for the price of one - to make it up ;)

Again there are cross-section graphs in the calendar - cross-sections are really important <3 (Later, maybe I should do a blogpost about these nuclear cross-sections;  what they really mean...)

Today there are two different cross-sections, for two different uranium isotopes (different "versions" of uranium). Both pictures show the cross-section/probability that the nucleus will fission (in blue) or capture (in red), when hit by a neutron.
Both graphs show the cross-section on the y-axis, and the energy of the neutron hitting the nucleus on the x-axis.


Uranium-238 is not a fissile nucleus; the probability that it will a capture a neutron is much bigger than the probability (cross-section) that it will fission...:(


Luckily the situation is different for the uranium-235 nucleus; the probability that this nucleus will fission when hit by a neutron is bigger than the probability that it will capture (and "eat") the neutron <3 *smiling*





2 kommentarer:

  1. Elsker graf-julekalenderen din! Skulle bare ønske du hadde den i fjor i stedet, da jeg hadde eksamen i kjerne- og strålingsfysikk :p Det burde vært mer julepynt på figurer i artikler og lærebøker, altså!

    SvarSlett
    Svar
    1. Aaaaw, så kos å høre <3
      Helt enig i at det burde være mer pynt på grafer - vurderer sterkt om det er mulig å snike inn litt (men betydelig mindre enn her, altså ;) ) pynt på grafer når jeg holder foredrag fremover...

      Slett

Related Posts Plugin for WordPress, Blogger...