Assigned 11-Sep-17
Due 18-Sep-17
2nd due date 21-Sep-17
Use the PDF sheet to record your answers. Save the PDF sheet to your computer. Record any work on separate pages.
Lecture 1: Chart of the nuclides
Use the chart of the nuclides, the readings on the chart of the nuclides, table of the isotopes, and web links to answer the following questions. Questions on the quiz can be posted to the blog.
Due 18-Sep-17
2nd due date 21-Sep-17
Use the PDF sheet to record your answers. Save the PDF sheet to your computer. Record any work on separate pages.
Lecture 1: Chart of the nuclides
Use the chart of the nuclides, the readings on the chart of the nuclides, table of the isotopes, and web links to answer the following questions. Questions on the quiz can be posted to the blog.
I am struggling to understand why the lower A group will be fission products from U-235 at the lowest A and then fission from Pu-239 at the larger A's in the 90<A<105 group. While there will be roughly equal fission yields for the larger A group.
ReplyDeletethe high A fission products are driven by doubly magic 132Sn; 82 neutrons and 50 protons. This is centered around A=135 for 235U and 239Pu. The lower A fission products are then based on the remaining nucleons that are not in the high A fission product. Since 239Pu has more nucleon than 235U, the lower A fission products will center at a higher mass for 239Pu. From the chart of the nuclides the lower A fission product peaks are:
DeleteIsotope lower A peak
235U 95 (6.5 %)
239Pu 100 (6.8 %)
I sent in the quiz yesterday.
ReplyDeletethanks for the quiz!
Delete