What is the size of neutrons in a neutron star?

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Discussion Overview

The discussion revolves around the size of neutrons in a neutron star and how extreme pressure affects their dimensions and the structure of the star. Participants explore theoretical implications, properties of matter under high density, and the nature of neutron stars.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions whether the pressure within a neutron star compresses the neutrons to a smaller size.
  • Another participant argues that instead of compressing neutrons, the pressure causes electrons to neutralize protons, resulting in a nucleus composed entirely of densely packed neutrons, with a proposed size of 11km to 11.5km in diameter.
  • A later reply speculates about a neutron star that is just under the mass required to collapse into a singularity, questioning if neutrons retain their size or if the quarks within them are pressed closer together.
  • One participant challenges the size claim by referencing external data suggesting neutron star diameters can reach up to 20km, questioning the previously stated maximum of 11.5km.

Areas of Agreement / Disagreement

Participants express differing views on the size of neutrons and the implications of pressure within neutron stars, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

There are limitations regarding assumptions about neutron size under extreme conditions, the definitions of size in this context, and the varying estimates of neutron star diameters based on different sources.

Cato
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Does the pressure within a neutron star compress the neutrons to a smaller size?
 
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No. However, it squashes the electron cloud onto the nucleus were they neutralize the protons. What you are left with is an atom all squshed into the nucleus which in turn is madeup of neutrons only. Further, because neutrons don't mind been near other neutrons and the pressure is insanely high, basically the entire star collapses into a gargantuan size nucleus, which is madeup of densely packed neutrons only. The size of this nucleus is really huge by nuclear sizes. It measures no less than 11km and no more than 11.5km in diameter, depending of how closed the neutrons are squeezed. The mass is even more mesmerizing! 1 - 2 Solar masses, all neatly packed in an 11km ball! I hope this helps.
 
Last edited:
Yes, thanks. But imagine a neutron star just a milligram less in mass than required to collapse it to a singularity. Are the neutrons really still the same size as they are without that pressure? Do the quarks in the neutrons get pressed closer together?
 

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