Discussion Overview
The discussion centers on the behavior of high-speed electrons when they collide with gold foil, drawing parallels to Rutherford's experiments with alpha particles. Participants explore the implications of such collisions for understanding the size and properties of electrons, as well as the energy levels at which electrons might rebound from targets like gold or protons.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant questions whether high-speed electrons, similar to alpha particles, would rebound directly back when fired at gold foil and seeks to understand the extent of the electron's field in such experiments.
- Another participant mentions the HERA accelerator, which has been used for electron-proton collisions, suggesting that there are existing experiments involving high-energy electrons.
- A participant emphasizes that Rutherford's findings are not solely based on backward scattering but also on the angular distribution of scattering, indicating the size of the gold nucleus relative to earlier models.
- It is noted that firing electrons at gold or protons does not measure the electron's size due to the larger size of the targets, and that electron-electron scattering supports the idea of electrons as point charges.
- One participant cites a specific upper limit on the electron radius, referencing a source that discusses high-energy scattering experiments and their implications for the electron's point-like nature.
- Another participant mentions Hans Dehmelt's Nobel Prize-winning work, which provides a smaller upper limit for the electron radius and supports the point-like model of electrons.
Areas of Agreement / Disagreement
Participants express differing views on the implications of electron scattering experiments, particularly regarding the measurement of electron size and the relevance of various scattering experiments. No consensus is reached on the specific outcomes of firing electrons at gold foil.
Contextual Notes
Participants acknowledge limitations in measuring the electron size due to the relative sizes of the targets used in experiments. The discussion includes references to specific upper limits on the electron radius and the conditions under which electrons are considered point-like.
Who May Find This Useful
This discussion may be of interest to those studying particle physics, experimental methods in high-energy physics, or the properties of fundamental particles like electrons.