Tony Hyun Kim (Partner: Connor McEntee) 10/17/2008 8.13 MW2-5 Prof. Roland.

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Presentation transcript:

Tony Hyun Kim (Partner: Connor McEntee) 10/17/ MW2-5 Prof. Roland

1. Introduction 1. Historical context 2. Atomic structure and differential cross-section 2. Experimental setup 3. Analysis and results 1. Interpretation of MCA histogram 2. Angular spread of the α-particle beam 3. Rutherford vs. Thomson model 4. Sources of error 5. Conclusion 1. Verification of the Rutherford hypothesis

 Discovery of the electron. Properties:  Negatively charged  Subatomic mass  Question: What is the structure of the compensating positive charge?  Prominent diffuse-charge model by Thomson  Idea: Use scattering experiments to probe the atomic structure.

Thomson scattering Rutherford scattering

Vacuum (< 80 microns) MCA provides counts over energy

A range of “valid-channels” constructed by looking at two std. deviations from the mean.

 At any howitzer angle, range of scattering angles possible.

Model for angular imprecision:

 Can dramatically improve expt. by increasing the accuracy of howitzer angle.

 Performed α-particle scattering from gold foils.  Excellent agreement to Rutherford cross section.  Obtained (χ²/dof = 0.95)  χ² prob. =  26 instances of back-scattering at 145 degrees.  Thomson model is completely rejected.  Obtained (χ²/dof = 99)  χ² prob. = 0! Verification of the nuclear hypothesis

 Thomson scattering (slide 4): astr.gsu.edu/hbase/Nuclear/rutsca3.htmlhttp://hyperphysics.phy- astr.gsu.edu/hbase/Nuclear/rutsca3.html  Rutherford scattering (slide 4): e.jpghttp:// e.jpg  Apparatus (slide 5):  PC Icon (slide 5):