Tuesday, February 2, 2016
CHEM 418 Nuclear Chemistry, Winter 2016: Lecture 9 Nuclear reactions
The lecture on nuclear reactions is presented in two parts. Nuclear reaction notation is introduced. The role of energetics in nuclear reactions is discussed and evaluated, including Q value, reaction barriers, and threshold energy. Center of mass and laboratory frames are discussed. The different processes involved in the formation of isotopes is provided including photonuclear processes. Reaction energetics, mechanisms and types are described. Nuclear reaction cross sections are described, with a presentation on values and limits given. This includes role of angular momentum in cross section values. The stellar production of elements is presented in terms of nuclear reactions. These provide the basis for understanding the formation of isotopes in stars.
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Quiz submitted through email. Thank you!
ReplyDeleteI sent the lecture 9 pdf quiz as an attachment through email.
ReplyDeleteThere is no recording on slide 26 and 27( Natural Element Production and Formation of Element)
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Emailed Quiz 9. Had trouble viewing part 2 of lecture 9.
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-Faruq
The PDF Quiz 9 is sent through Canvas in the second email. I also could not get the second half of the lecture to work in either form. Has it already been switched over to a YouTube channel?
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ReplyDeleteI have emailed you my PDF quiz 9.
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ReplyDeleteLecture slides viewed and PDF quiz 9 sent by email!
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ReplyDeleteI have a question, from slide 5 of this lecture. You describe the Center of Mass framework as where the products and reactants are hitting each other. How exactly would that work?
You were comparing this to the laboratory framework, where a moving projectile collides with a (assumed) stationary target and then continues to keep moving after collision too.
With center of mass, you assume a reaction occurs at the center of mass of the objects. In this way equations use to describe the reactions are normalized. As you stated, in the laboratory the conditions the stationary target obtains energy from the projectile, which cannot go into the reaction process.
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ReplyDelete-Faruq