Nuclear explosion and black holes


by Eagle9
Tags: black, explosion, holes, nuclear
Eagle9
Eagle9 is offline
#1
Feb5-14, 03:14 PM
P: 130
The nuclear explosion occurs when the nucleus of atom of Uranium (of Plutonium) are split in two pieces by neutrons. These two pieces are repelled from each other due to (the same) positive charge; these pieces are moving quickly between other Uranium atoms, colliding with them. These collisions results in extremely increasing the temperature and eventually-explosion, right?

Now, when some certain object is falling in the black hole the latter’s tidal forces will destroy this object. First the chemical bonds (covalent, ionic, hydrogen) will be broken between atoms, then the electrons will be separated from nucleus. Afterwards the nucleus will be broken into protons and neutrons. But these protons will also repel from each other because of the same reason as it was in case of nuclear fission.

So, can the black hole’s tidal forces trigger the nuclear explosion if we push the Uranium object (sphere, cylinder and etc.) into the black hole?
Phys.Org News Partner Physics news on Phys.org
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Mapping the road to quantum gravity
Chameleon crystals could enable active camouflage (w/ video)
mathman
mathman is offline
#2
Feb5-14, 03:41 PM
Sci Advisor
P: 5,941
Your description of the nuclear explosion is incorrect. The main point is that the fission products include neutrons which induce fission in other atoms (chain reaction). Also high energy photons (gamma rays) are produced during the fission. The explosion is a combination of chain reaction plus energy.

http://en.wikipedia.org/wiki/Nuclear_fission
mfb
mfb is offline
#3
Feb5-14, 04:27 PM
Mentor
P: 10,854
To split nuclei, you would need extremely strong tidal forces. Assuming black holes are as described in general relativity, forces so strong that you don't reach them before the nucleus is less than 1 atom diameter away from the center. Long before you reach this point the matter got split into individual atoms, and you don't get a chain reaction any more. In addition, gravitational force is completely dominating at that point - the nuclear energy gets negligible.

Astronuc
Astronuc is offline
#4
Feb5-14, 07:24 PM
Admin
Astronuc's Avatar
P: 21,637

Nuclear explosion and black holes


Quote Quote by Eagle9 View Post
The nuclear explosion occurs when the nucleus of atom of Uranium (of Plutonium) are split in two pieces by neutrons. These two pieces are repelled from each other due to (the same) positive charge; these pieces are moving quickly between other Uranium atoms, colliding with them. These collisions results in extremely increasing the temperature and eventually-explosion, right?

Now, when some certain object is falling in the black hole the latter’s tidal forces will destroy this object. First the chemical bonds (covalent, ionic, hydrogen) will be broken between atoms, then the electrons will be separated from nucleus. Afterwards the nucleus will be broken into protons and neutrons. But these protons will also repel from each other because of the same reason as it was in case of nuclear fission.

So, can the black hole’s tidal forces trigger the nuclear explosion if we push the Uranium object (sphere, cylinder and etc.) into the black hole?
If the gravitational field in the vicinity of a black hole would cause the density of a critical mass to exceed the critical density, then a nuclear explosion or at least an excursion (increase in power without explosion) could occur. However, that effect would pale in comparison to the effects of a black hole. If the critical mass is distorted such that prompt criticality is unachieveable, there would be no explosion. If the mass is distorted from it's critical form, then it would go subcritical and no excursion would occur.
Eagle9
Eagle9 is offline
#5
Feb13-14, 10:19 AM
P: 130
mfb
Assuming black holes are as described in general relativity
Why “assuming”? Don’t you believe in their existence?

mathman
mfb
Astronuc
Thanks
mfb
mfb is offline
#6
Feb20-14, 05:14 PM
Mentor
P: 10,854
Quote Quote by Eagle9 View Post
mfb

Why “assuming”? Don’t you believe in their existence?
It is certain that black holes exist. It is unclear how they look at the event horizon and "inside", and it is questionable if a description with GR alone (no quantum mechanics) is right.
Eagle9
Eagle9 is offline
#7
Feb21-14, 11:13 AM
P: 130
Quote Quote by mfb View Post
It is certain that black holes exist. It is unclear how they look at the event horizon and "inside", and it is questionable if a description with GR alone (no quantum mechanics) is right.
But cannot the general relativity describe black hole’s event horizon and inner part?
mfb
mfb is offline
#8
Feb21-14, 11:22 AM
Mentor
P: 10,854
I can describe the sun as big block of glass, and I'm sure it is possible to do that in a self-consistent way. That does not make the description right.


Register to reply

Related Discussions
Can black holes be disintegrated from a sufficiently powerful explosion? Astrophysics 34
Does nuclear decay apply to atoms of matter consumed by black holes? General Astronomy 2
How are black holes linked to worm holes, or are they the same thing, Cosmology 6
Black holes, white holes and expansion of Universe Cosmology 7
White Holes are time-reversed black holes? General Physics 29