EXAM 1
is now available
is now available
Exam 1 answers will be posted.
Assigned: 19-Jan-17
1st Due Date: 24-Jan-17
2nd Due Date: 27-Jan-17
The first iteration of the exam is due 24-Jan-17. The answers will be posted on 25-Jan-17. Any incorrect answers can be resubmitted by 27-Jan-17. Changed answers will be worth 50 % of the original grade. For the 2nd resubmission the work related to the changes must be shown. Please post all questions to the blog.
There will be an in class meeting on Monday 23 January. This quiz covers:
Lecture 1: Introduction, Chart of the Nuclides
Lecture 2: Nuclear Properties
Lecture 3: Decay Kinetics
Lecture 4: Alpha Decay
Lecture 5: Beta Decay
Use lecture notes, textbooks, Chart of the Nuclides, Table of the Isotopes, and web pages. Use the chart of the nuclides as your primary dataset for isotope half-life. Show your work or references on a separate page and save electronically. Please use 3 significant digits for your answers.
I was wondering what we are supposed to put in the table for question 3? There is an open space to type at the top of the table and I'm not sure if it wants an equation, constants, or something else.
ReplyDeleteThere is nothing to put into the top of the first table in Question 3. You can leave it blank. I will upload a new version of the quiz without this space. Thanks for the note.
ReplyDeleteA new copy of the quiz has been uploaded. Question 3 has the blank space eliminated. Question 6.2 now has the isotopes 227Ac, 227Th, 223Ra, and 219Ra in the table instead of 227Ac, 135Ce, 135La, and 135Ba.
ReplyDeleteI am confused on question 6 of the exam. Are we supposed to somehow incorporate the flux value into the equation for finding atoms & activity? I can't seem to find that information in my notes.
ReplyDeleteThe equation is on slide 17 of lecture 3, part 2. The number of produced 227Ra atoms (N1) is based on the number of 226Ra atoms (N0) the cross section, the flux, the decay constant (using the 227Ra half-life), and the time t.
DeleteCould you explain in picking the transition type from spin and parity change for 7.2? Since there is no parity change and the spin change is 1 (Gamow-Teller), I am thinking "allowed" and "second forbidden".
ReplyDeleteThis is very close. Since A is low the transition is Fermi. This is a spin change with no parity change, 2nd forbidden. The logft=9 is within 1st forbidden according to the table.
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ReplyDeleteThe answers to Exam 1 are now available. You can review the answers and make changes to your exam. The result in the answers may vary slightly from your calculations. As an example, different cross sections can be found for neutron capture of 226Ra. The result will vary with the cross section used, with difference on the order of a few percent. If you have values in your exam that are slightly off, they will likely be counted as correct. If your values differ greatly, then you should resubmit. Please use your 1st exam for the submission. Include all answers, not just the changed answers. With your submission indicate the question changed and provide the work or reasoning for the change. The resubmission is due 27 January 2017. Please post all questions to the blog.
ReplyDeleteFor number 1, I put 2.4E14 for the density of a neutron star (got it from the first row of the table on the linked website). Would that be considered incorrect?
DeleteI put the same
DeleteThat will work. I am looking for a comparison between the two calculations. The goal is to show that a neutron star as similar density to nuclear matter.
DeleteIs there a way to calculate the answers for question 6.2 (specifically the 2nd-4th columns) without the ERG program? I'm unable to download it onto my laptop and I can't figure out how to get the correct answers otherwise.
ReplyDeleteYou can use the Bateman equation as discussed in the lecture notes. This will work but is tedious. If you wish I can send out output files from the ERG program.
DeleteExam 1 resubmission has been submitted via email (with attachments)
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