Friday, January 13, 2017

CHEM 418 Nuclear Chemistry, Winter 2017: Lecture 4 Alpha Decay

This lecture discusses alpha decay in radionuclides.  Theories on alpha decay are presented. Systematics and energetics involved in alpha decay are presented.  The correlation between Q value and decay energy is described.  The Geiger Nuttall relationship is provided, described, and utilized in a model for alpha decay. Tunneling is also exploited to described alpha decay, coupling energy and half-life.  Gamow calculations are shown to reflect the Geiger Nuttall relationship. Hindered alpha decay is discussed. Hindered alpha decay is employed to described nuclear properties. Hinderance factors are described, along with how they are calculated and where they can be found. Proton and other charged particle emission are presented. The lecture time is 50 minutes.  The lecture is assigned on Friday 13 January 2017 and due Wednesday 18 January 2017. 
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13 comments:

  1. Ken CzerwinskiJanuary 17, 2017 at 2:14 PM

    thanks for the submitted PDF quiz 4.

    ReplyDelete
  2. AnonymousJanuary 17, 2017 at 11:49 PM

    For quiz 4, I found there are two 244Cm on question 1.

    ReplyDelete
  3. Ken CzerwinskiJanuary 18, 2017 at 12:18 AM

    Thanks. I will review and correct question 1.

    ReplyDelete
  4. Ken CzerwinskiJanuary 18, 2017 at 7:30 AM

    Note on question 1. The isotope 244Cm appears twice. This does not impact the correct answer in the PDF quiz.

    ReplyDelete
  5. Paul SimJanuary 18, 2017 at 4:17 PM

    Lecture viewed and pdf quiz 4 submitted via e-mail.

    ReplyDelete
    Replies
    1. UnknownJanuary 18, 2017 at 4:20 PM

      thanks for your reply. Please see my e-mail response.

      Delete
  6. AnonymousJanuary 18, 2017 at 8:13 PM

    Lecture 4 has been reviewed and the PDF quiz 4 has been submitted.

    ReplyDelete
  7. AnonymousJanuary 18, 2017 at 8:35 PM

    Lecture and quiz 4 viewed and submitted

    ReplyDelete
  8. AnonymousJanuary 21, 2017 at 3:44 PM

    Lecture was viewed and Quiz 4 submitted. I apologize for the late submission.

    Could you expand on obtaining the "lower" kinetic energy of emitted alpha particle and using it to determine velocity of alpha particle in the nucleus?

    ReplyDelete
    Replies
    1. Ken CzerwinskiJanuary 22, 2017 at 12:05 AM

      The alpha particle velocity is 1/2mv^2. The kinetic energy of the emitted alpha particle can be used to calculate the particle velocity. Depending upon the specific isotope, the alpha decay may have different energies. This velocity, combined with information on the nuclear radius, can be used to calculate how often the particle traverses the nucleus prior to emission.

      Delete

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