Strong Nuclear Force

Mar 2019
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cosmos
Why must neutron take part in nuclei (except Hydrogen)? If there is really a strong force in nature, it seems that Lord needs not to do that. He wil just use the strong force to overwhelm the electromagnetic force and cosmos seems to be simpler.
If you are Lord, what will you do?
 

topsquark

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Apr 2008
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On the dance floor, baby!
Why must neutron take part in nuclei (except Hydrogen)? If there is really a strong force in nature, it seems that Lord needs not to do that. He wil just use the strong force to overwhelm the electromagnetic force and cosmos seems to be simpler.
If you are Lord, what will you do?
Ummmm.... Religion is a not a topic that we encourage here. It just causes problems.

As to the neutrons, the strong force acts on both neutrons and protons. We need more neutrons in the nucleus as we go up the Periodic Table so that the strong force can balance the electromagnetic force between the protons.

-Dan
 
Mar 2019
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cosmos
Ummmmm

Why US presidents put a hand on the Bible when they swore in?
 

topsquark

Forum Staff
Apr 2008
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651
On the dance floor, baby!
Why US presidents put a hand on the Bible when they swore in?
It's supposed to make it a solemn and unbreakable oath.

Please, no politics either. :)

-Dan
 
Mar 2019
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cosmos
force...

How about film? Someone talk about Star Wars in the philosophical column and I am just following...
Episode 7 :
BB8 is happy there because he joined the crew,,,maybe mostly because he always following a beautiful lady...
 
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Oct 2017
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Why must neutron take part in nuclei (except Hydrogen)? If there is really a strong force in nature, it seems that Lord needs not to do that. He wil just use the strong force to overwhelm the electromagnetic force and cosmos seems to be simpler.
If you are Lord, what will you do?
There are different ways of thinking about this situation:

Firstly, from the perspective of experiments, it is possible to determine the mass and charge of a particular substance. The results indicate that the mass and the charge do not correlate exactly for a given substance. Furthermore, there are different isotopes of the same element, whose nuclei have the same charge but different masses. The Karlsruher chart, which is a bit like the periodic table of elements but for isotopes, lists all atomic nuclei and their properties. It is a plot of the proton number and the nucleon number and there is clearly not a straight line there.

Secondly, one can ask what the role of neutrons are in the atom. Well, looking at the Karlsruher chart, the black curve in the middle of the chart, which indicates the stable isotopes, demonstrates that for a given element, if there are too many or too few neutrons, the nucleus becomes unstable and beta decay occurs. This makes sense when you consider that a collection of protons have the same positive charge, so they repel each other; neutrons help to 'pad out' the nucleus and make sure that the strong force keeps the particles together rather than giving way to the EM force that would separate them out.

There's other evidence for the strong force also, from collision experiments (linear or circular colliders). Experiments typically used two protons, but similar experiments can also be conducted with neutrons and mesons.

Shameless plug: I highly recommend getting hold of a particle physics book, like this one: https://books.google.co.uk/books?id=7tsVcsm84rEC&printsec=frontcover&dq=introduction+particle+physics+manchester&hl=en&sa=X&ved=0ahUKEwii9t7Vw4vhAhWpTRUIHb3LCpYQ6AEIKjAA#v=onepage&q=introduction particle physics manchester&f=false

I actually did a mini project with Graham Shaw for my Masters and it was really interesting and fun :)
 
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Why Neutrons

There is plenty of experimental evidence for Neutrons and for their role in the stabilisation of the nucleus of the atom.

However the description we have of the neutron is based on our interpretation of the experimental data,
which is in turn based on our existing interpretation of the nature of the subatomic world.

Theoretical physicists are postulating ideas of symmetry, strings, etc... to explain the "why" of the (experimentally observed) particle zoo.

Progress is being made, but I think we are still waiting for someone to have that "Eureka" moment,
then it will be obvious that the new interpretation requires neutrons as an inescapable consequence of the nature of reality.
 
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Mar 2019
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Thaks benit as well as woody.
I want to tell a funny story here. 一骑红尘的“骑”,三十多年前就念“qi”了 is a hot thread in China. The story comes from a famous Chinese poem in the Tnag Dynasty, the same period as the story Travelling to the West. At that time, the Chinese capital is Changan city locating in the northwest. For the sake of the queen, the king asked a cavalry to stransport LiZhi (a kind of fruit) to the capital from south China. The queen smiled when she saw the horse coming...
That thread pointed out that overwhelming percent of people pronounce the Chinese character “骑” as "ji" up to this date, while the country standard pronounciation has been "qi" decades ago...
I'm not so much a specialist in particle physics, but I know that Landau had a model of neutron too decades ago... Maybe it's not mature due to limit of era. I think that different model of neutron will lead to different opinion about the stronge nuclear force.
The perfect model of neutron should explain not only the inescapable consequence in nuclei but also the magneitc moment of neutron, why neutron star generates extreme strong magnetism, as well as why neutron star can emit X ray,etc.
I don't know if people used to estimate a kind of force in molecules before...
 
Oct 2017
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Thaks benit as well as woody.
The perfect model of neutron should explain not only the inescapable consequence in nuclei
Yes, the nuclear shell model, ...

but also the magnetic moment of neutron,
... the quark model (neutrons are made up of quarks) ...

why neutron star generates extreme strong magnetism, as well as why neutron star can emit X ray,etc.
... and the neutron star equation of state are active research topics.

I don't know if people used to estimate a kind of force in molecules before...
Oh yes! There's *loads* of papers and many, many research groups. I even studied 12C + 12C reactions for my PhD ;)