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Topic: a neutron star...< Next Oldest | Next Newest >
 Post Number: 11
CatKnight Search for posts by this member.
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PostIcon Posted on: Feb. 23 2001,00:26  Skip to the next post in this topic. Ignore posts   QUOTE
didnt i just say that?

darkknightbob made it sound like a neutron contained an electron and a proton, which it doesn't.

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 Post Number: 12
askheaves Search for posts by this member.
Ack!!!
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PostIcon Posted on: Feb. 23 2001,01:19 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE
that british dialect gets me every time. damn limey bastards
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 Post Number: 13
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PostIcon Posted on: Feb. 23 2001,02:49 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE
quote:
Originally posted by aventari:
This is from Hawking's "A brief history of time"..

That may be true, but it is the result of one of my calculations, which is why its first order...

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 Post Number: 14
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PostIcon Posted on: Feb. 23 2001,05:44 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE
incubus i think you are referring to electron degeneracy. that happens right when then neutron star is formed. all of the electorns collide into the protons, creating neutrons and neutrinos. this is a supernova, btw.
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Dark Knight Bob Search for posts by this member.
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PostIcon Posted on: Feb. 23 2001,20:44 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE
bah it was just an idea gimme a break its only my first year in astrophysics

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Hey DKB shu'p with all that jibba jabber ya crazy foo!

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 Post Number: 16
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PostIcon Posted on: Feb. 24 2001,00:43 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE
free neutrons decay to a proton and an electron. The half life for this is fairly short. Can't remeber the exact number though...

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 Post Number: 17
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PostIcon Posted on: Feb. 24 2001,06:47 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE
quote:

Free neutrons undergo beta decay with a mean lifetime of about 10 minutes

Serway, R.A., 1996, Physics for Scientists and Engineers: with Modern Physics 4th Ed., Saunders College Publishing, Philadelphia, p. 1382.

The key word here is 'free'. That is, a neutron all by itself. After about 10 mins, it will spit out an electron and transform into a proton.

.

quote:

The density of a neutron start is about 1.2x10^14 gcm^-3 ... slightly less than the density of a neutron, which is about 4x10^14 gcm^-3 ... we can conclude that the gravitational pressure of the neutron star is balanced by the repulsive component, due to the exclusion principle, of the strong nuclear force between the neutrons.

Tipler, P.A, 1992, Elementary Modern Physics, Worth Publishers, New York, pp. 314-315.

Also, a neutron star with the mass of our sun will have a radius of 12.7 km. As the mass increases, the radius decreases, until you get a black hole. About 1.7 - 3 solar masses is the limit for neutron stars. After this you get black holes.

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 Post Number: 18
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PostIcon Posted on: Feb. 24 2001,14:23 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE
Thats called the Chandresekar limit

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 Post Number: 19
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PostIcon Posted on: Feb. 24 2001,15:22 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE
yeah then its squish time baby!

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Hey DKB shu'p with all that jibba jabber ya crazy foo!

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 Post Number: 20
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PostIcon Posted on: Feb. 24 2001,17:09 Skip to the previous post in this topic.  Ignore posts   QUOTE
1*10^13 years maybe? neutrons dont decay into hydrogen spontaneously as far as i know...

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