Thursday, January 19, 2017

Spring 2017 CHEM 312: Lecture 2 Nuclear Properties

A discussion on systematics of nuclear properties are presented.  Mass, mass excess, and mass distribution within the nucleus is presented.   Mass excess data are used to calculate energies in decays.  Equations for determining nuclear radii are provided.  Models that are used to describe the stability of nuclei are introduced.  Nuclear shapes and structures are introduced. The lecture time is 47 minutes. The supplemental lecture on the Q value calculator is around 3 minutes.  The lectures are available in Powerpoint audio and MP4 format from the CHEM 312 youtube channel.  The lecture is assigned: 19-Jan-17 and PDF Quiz 2 is due 29-Jan-17.
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39 comments:

  1. UnknownJanuary 20, 2017 at 4:04 PM

    i try to do the question 2.5 and 2.7 about positron decay. Positron decay of 91Nb: Q=91Nb -(91Zr +1.022) MeV, i got Q= -8.66377-(-8.78911+1.022)= -0.897MeV. it is right? it is a negative number?

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  2. Ken CzerwinskiJanuary 21, 2017 at 9:07 AM

    I am not sure about the numbers you are using. The mass excess values I find from http://www.nndc.bnl.gov/nudat2/indx_sigma.jsp are:

    Isotope Δ(MeV)
    91Nb -86.6393
    91Zr -87.8973

    You can also find the Q-value from http://www.nndc.bnl.gov/qcalc/

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    Replies
    1. UnknownJanuary 25, 2017 at 8:46 PM

      Thanks, i get it. And i send the quiz 2 by email.

      Delete
  3. UnknownJanuary 21, 2017 at 7:44 PM

    I completed the lecture and emailed you my quiz, thank you!

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  4. Ken CzerwinskiJanuary 21, 2017 at 9:26 PM

    For question 3, you should refer to page 28 of the lecture titled Nuclear Shapes: Radii. There is an equation for calculating radii. The range will be based on ro~1.1 to 1.6 fm.

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  5. UnknownJanuary 24, 2017 at 1:22 PM

    I have just completed the lecture and finished the quiz. taking notes in tandem with the video lecture helps quite a bit

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  6. UnknownJanuary 24, 2017 at 1:24 PM

    I also have one other question, would you be able to post the material for the next lecture early? for reasons as to study ahead?

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    Replies
    1. Ken CzerwinskiJanuary 26, 2017 at 9:04 AM

      I will do my best. The lectures are present, but they may be updated. In the future I will try to get ahead. I will send out an email to the class when the updated lectures are posted.

      Delete
  7. UnknownJanuary 25, 2017 at 6:59 PM

    Lecture 2 and quiz completed. Supplemental video on using the Q Calculator was a lifesaver.

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  8. UnknownJanuary 27, 2017 at 11:06 PM

    Hello!
    I initially had trouble connecting to both of the Q calculator websites, but I was able to get the nndc website running to check my work. I've completed the lecture and emailed you a copy of my completed PDF Quiz 2.
    Thanks!
    Halli

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  9. UnknownJanuary 28, 2017 at 3:36 PM

    I used the second link for the Q-value calculator because the first wouldn't even open on my computer. When I tried to do the positron decays, the calculator told me it was a negative value for both but did not give me an actual number so I looked up the values elsewhere.

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    1. UnknownJanuary 28, 2017 at 6:51 PM

      Just use the link
      http://www.nndc.bnl.gov/qcalc/

      Remove the qcalcr.jsp at the end of the link and it should work. That's what I did.

      Delete
  10. UnknownJanuary 28, 2017 at 6:48 PM

    I emailed you my PDF Quiz as an attachment.

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  11. Josephine LiberoJanuary 28, 2017 at 9:29 PM

    Pdf Quiz sent. Had issues with the links from the pdf quiz for some reason but the link for values from the power point worked
    Thank you

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  12. Emeri QuiamjotJanuary 28, 2017 at 11:35 PM

    Liquid Drop Binding/Drop model was a little confusing but the rest of the lectures was straight forward. Thank you for the calculator link. I e-mailed you my quiz_2.

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  13. UnknownJanuary 29, 2017 at 12:23 AM

    Hi! Just submitted my quiz! Thanks for doing that supplementary video; it was a big help! :)

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  14. UnknownJanuary 29, 2017 at 1:24 AM

    Finished the lecture, and submitted my quiz!!

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  15. UnknownJanuary 29, 2017 at 7:43 AM

    I've finished and submitted my quiz. Thank you!

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  16. Paul FerlazzoJanuary 29, 2017 at 1:07 PM

    Quiz sent. Also the first link doesn't work. Also for 2.5 and 2.7 the Q value is negative which apparently means that there is no decay. Hope that is an acceptable answer on the quiz.

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    Replies
    1. Ken CzerwinskiJanuary 30, 2017 at 11:08 PM

      While you can get a negative Q value, 64Cu does decay via positron emission. Qβ+ is positron decay (652 keV), while Qp is proton emission (-7200 keV). The quiz was received.

      Delete
  17. UnknownJanuary 29, 2017 at 2:00 PM

    I've viewed the lecture and emailed the quiz.

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  18. UnknownJanuary 29, 2017 at 9:57 PM

    Lecture 2 and quiz completed. Thanks!

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  19. UnknownJanuary 29, 2017 at 10:14 PM

    Just completed lecture 2 and submitted the quiz.

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  20. UnknownJanuary 29, 2017 at 10:35 PM

    Submitted the quiz. Thank you for the links!

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  21. UnknownJanuary 29, 2017 at 11:09 PM

    I have submitted quiz 2 via email

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  22. Riyadh RollinsJanuary 30, 2017 at 5:56 PM

    I have finished the lecture and emailed quiz 2. Thanks again!

    ReplyDelete
  23. UnknownFebruary 1, 2017 at 7:36 PM

    I have submitted my pdf quiz 2

    ReplyDelete

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