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Nuclear Physics Study. 2009/08/01 Grass. From CERN, Summer Student Program 2005. Do you recognize me?. Do you recognize me?. http://www.lbl.gov/abc/wallchart/index.html. Strong v.s . Electromagnetic. Radioactivity. b - decay: n p + e - + n - PowerPoint PPT Presentation
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Nuclear Physics Study
2009/08/01Grass
From CERN, Summer Student Program 2005
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Do you recognize me?
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Do you recognize me?
4http://www.lbl.gov/abc/wallchart/index.html
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Strong v.s. Electromagnetic
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Radioactivityb- decay: n p + e- + n
b+ decay: p n + e+ + n (e.g., 14O8 14N7 + e+ + n)
a decay: (e.g., 238U8 234Th90 + 4He2 )
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3a reaction : a+a+a 12Cap process : 14O+a 17F+p 18Ne 18Ne+a ...
Capture Process
Proton capture Neutron
capture
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The Liquid Drop ModelTheir interior densities are the sameTheir heats of vaporization are proportional to their masses.
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Magic number
See the movie…
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Shell Model
Including a spin-orbit interaction Predicted magic numbers
1st Shell: 2 states (n = 0, j = 1/2). 2=22nd Shell: 6 states (n = 1, j = 1/2 or 3/2). 8 = 2+63rd shell: 12 states (n = 2, j = 1/2, 3/2 or 5/2). 20 = 2+6+124th shell: 8 states (n = 3, j = 7/2). 28 = 2+6+12+85th shell: 22 states (n = 3, j = 1/2, 3/2 or 5/2; n = 4, j = 9/2). 50 = 2+6+12+8+22 6th shell: 32 states (n = 4, j = 1/2, 3/2, 5/2 or 7/2; n = 5, j = 11/2). 82 = 2+6+12+8+22+32 7th shell: 44 states (n = 5, j = 1/2, 3/2, 5/2, 7/2 or 9/2; n = 6, j = 13/2). 126 =
2+6+12+8+22+32+448th shell: 58 states (n = 6, j = 1/2, 3/2, 5/2, 7/2, 9/2 or 11/2; n = 7, j = 15/2).
184 = 2+6+12+8+22+32+44+58
the nuclear shell model is a model of the atomic nucleus which uses the Pauli exclusion principle to describe the structure of the nucleus in terms of energy levels.
Sup
er-n
ova
X-r
ay B
urst
er
Nucleosynthesis Paths
The End
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The S-process acting in the range from Ag to Sb.
http://en.wikipedia.org/wiki/S-process
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