A general overview of nuclear fission is presented. The probability of fission is described based on developed models including the liquid drop model and shell corrections. Discussion on spontaneous fission and fissioning isomers is given. The transition nucleus and fission product distributions are discussed. The total kinetic energy, mass distribution, and charge distribution during fission are presented. Changes in fission product distribution with parent properties are introduced. Delayed neutrons from fission and their role in reactors are given. Proton induced fission is introduced.
I have finished the lecture and submitted the quiz. I used 132Sn as a fission product for the estimation of Pu fission barrier. Is this fine?
ReplyDelete132 is doubly magic and is a fine fission product to use!
DeleteI finished the quiz, but I wasn't sure how to predict the fission barrier in question 1. I looked at the course reading for Plutonium Chemistry but maybe I missed it in the lecture. Were we supposed to use an averaging method?
ReplyDeleteFor predicting the fission barrier get the Q value for the neutron capture of 239Pu (which fissions) and neutron capture of 240Pu (which does not fission). The fission barrier is between the Q value of these two isotopes. This is explained on slide 4 of the lecture.
DeleteI just submitted the quiz. I had the same question as Catherine, and assumed it was somewhere in between the two isotopes of Pu in 1.1 and 1.2. Was that okay?
ReplyDeletethat is correct!
DeleteI just submitted the quiz. I also estimated that the fission barrier for question 1 was somewhere between the two values in the previous parts of the question.
ReplyDeletethat is correct, and that is a good estimate.
DeleteSubmitted the quiz. Like others, I put a value for the fission barrier that was between the two.
ReplyDeletethat is right!
DeleteFinished the lecture and quiz
ReplyDeletethanks for the pdf quiz
DeleteJust finished the lecture and have submitted my quiz. As others, I was unsure about 1.3 and which isotope of Pu we were to estimate the fission barrier for.
ReplyDeletefission barrier is greater than the Q value for neutron capture on 240Pu (it does not fission) but less than the Q value for neutron capture on 239Pu (which does fission).
DeleteQuiz submitted and lecture complete
ReplyDeletethanks!
DeleteI finished the quiz and the lecture over the weekend but I'm turning it in now. I had a question on one of the quiz questions. It was the estimate the fission barrier for Pu. I wasn't really sure what to do so I gave a general number it would fall around by solving a random fission problem for 240Pu.
ReplyDeleteI had trouble with this one as well. I assumed that the fission barrier is higher than the Q value for the non-fissile reaction and not greater than the Q value for the fissile one which left all values in between.
Deletethat is correct!
Delete