Questions tagged [particle-physics]

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Difference between Perrin's and J. J. Thomson's experiment

In J. J. Thomson's paper (Phil. Mag. S. 5. Vol. 44. No. 269. Oct. 1897) concerned with cathode rays, Thomson writes, that the experiment by Perrin that supposedly proves that cathode rays are made of ...
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1answer
546 views

How did J. J. Thomson establish the particle nature of the electron?

In its article about how the electron was discovered, Wikipedia says that Thomson and his students performed experiments which suggested that cathode rays were negatively charged "particles". But even ...
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29 views

How did J. J. Thomson establish particle nature of electron?

I've read about how the electron was discovered on Wikipedia and they have said that Thomson and his students performed experiments which suggested that cathode rays were negatively charged "particles"...
2
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1answer
140 views

Why was the idea of anti-particles having negative mass abandoned?

In Dirac's 1938 paper on classically radiating electrons, he writes: Secondly we have the idea of the positron... in which positive and negative values for the mass of an electron play symmetrical ...
7
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1answer
206 views

Who did say that anyone who discover a new particle should be fined instead of receiving a prize?

I am almost sure I read once that a famous physicist said that anyone who discover a new particle should be fined instead of receiving a prize. The context was that at the time there was more and more ...
3
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1answer
90 views

How was proton determined to be a common component of all atoms?

Based on what I know of the discovery of positive charges, Thompson measured the $e/m$ ratio of various nuclei and their $e/m$ ratio (charge-to-mass ratio) was not constant. People did not know ...
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1answer
105 views

When was the quantization of spin discovered? [duplicate]

When was the fact that a spin could only have values S = n/2 derived? I cannot find any source that says when.
3
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1answer
517 views

How was the spontaneous symmetry breaking introduced and how did it lead to the Higgs mechanism?

I'm looking for the way things were connected. It seems me to that it was like this: Spontaneous symmetry breakdown was detected in condensed matter physics. (I'm not sure of facts here) Later it ...
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1answer
456 views

How did Stern-Gerlach experiment change the concept of space quantization and electron spin?

I got confused by a question which is : "How did Stern-Gerlach experiment change the concept of space quantization and electron spin?" Its the question asked in our ...
3
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0answers
150 views

In which paper did the typical textbook diagrams of the Millikan experiment appear the first time?

There are two typical visualizations for one of the results of the Millikan oil-drop experiment to illustrate that only integer multiples of some elementary charge occur in nature. The first one is ...
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76 views

Did breaking of discrete symmetries play a role in the development of steady-state cosmology?

If you look at the original pair of 1948 papers[Bondi 1948,Hoyle 1948] that proposed the steady-state model, it's clear that they knew they were throwing out a lot of cherished principles of physics. ...
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1answer
144 views

Did classical physicists feel ill-at-ease about point charges?

The point charge concept is clearly a very useful mathematical fiction, but it is also problematic from the point of view of "physical intuition". Even a layperson would feel that an explanation is ...
5
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1answer
229 views

Where did the term “tauon” come from?

The tau particle (so named because it was the third charged lepton, behind the electron and muon) was discovered in the 1970s by Martin Perl and colleagues. In one of the SLAC papers, Perl refers to ...
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189 views

Was there a period of doubt in the history of the Higgs mechanism?

As the LHC begins its second run this year, the physics community seems to be significantly split between those who are confident that SUSY exists and those who believe it doesn't, given its failure ...
10
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1answer
500 views

Where did the naming structure of particles come from (suffix -on)?

I was looking at a list of particles, and I noticed that many of them ended in -on. Proton, electron, neutron, lepton, etc. Is there a historical (or linguistic) reason behind this naming structure?
7
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1answer
114 views

When the Superconducting Super Collider was built, was the future of the site planned for?

The Superconducting Super Collider was the greatest experiment that was never built. It was cancelled in 1993 after years of planning and effort, during which there was some construction of facilities....
9
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1answer
272 views

Why don't we name the Higgs boson a “higgson”?

We have fermions (named after Fermi) and bosons (named after Bose). Why don't we name the particle corresponding to the Higgs field a "higgson"? The superpartner particle (sparticle) of the Higgs ...
9
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1answer
156 views

What theories preceded the wave, particles and duality models of light?

Currently, the wave-particle duality model for light is the accepted model. From HyperPhysics: The evidence for the description of light as waves was well established at the turn of the century ...