Go Back   Physics Help Forum > Lobby > New Users

New Users New to PHF? Post up here and introduce yourself!

Reply
 
LinkBack Thread Tools Display Modes
Old Apr 24th 2017, 08:49 PM   #1
Junior Member
 
Join Date: Apr 2017
Posts: 3
Help with elementary nuclear physics

How does an increase in the neutron reflection effect the fission reaction? I've read that maximum achievable reflection is 50%, if we have a hypothetical mirror that reflects 100% neutrons how will that effect the fission reaction and the reactor design?
programbot is offline   Reply With Quote
Old Apr 25th 2017, 04:27 AM   #2
Senior Member
 
Join Date: Apr 2017
Posts: 291
If you had a 100% neutron mirror surrounding a common rock the rock would explode ... most things have some uranium in them , even if one part in a trillion trillion, so no neutrons wouldn't escape , bounce around inside the containing mirror , until all fissile material in the rock fizzed in a split second .

I'm not sure how an atom is able to scatter a neutron , it has no charge , must be some force acting only at close quarters in the nucleus.
oz93666 is offline   Reply With Quote
Old Apr 25th 2017, 07:11 AM   #3
Junior Member
 
Join Date: Apr 2017
Posts: 3
Originally Posted by oz93666 View Post
If you had a 100% neutron mirror surrounding a common rock the rock would explode ... most things have some uranium in them , even if one part in a trillion trillion, so no neutrons wouldn't escape , bounce around inside the containing mirror , until all fissile material in the rock fizzed in a split second .

I'm not sure how an atom is able to scatter a neutron , it has no charge , must be some force acting only at close quarters in the nucleus.
Atoms do that by elastic scatter, a result of the strong nuclear force being repulsive beyond a certain distance. (Correct me if I am wrong)

Now what about a nuclear reactor which has a 100% reflector installed, and only a controlled amount of fissile material is introduced to attain the exact amounts of energy, barring reflector particulars, would that reduce the core size as compared to a conventional fission reactor? What about the neutrons lost due to decay? (Neutrons half life of around 11 minutes or so)
programbot is offline   Reply With Quote
Old Apr 25th 2017, 10:26 PM   #4
Senior Member
 
Join Date: Apr 2017
Posts: 291
Originally Posted by programbot View Post
Atoms do that by elastic scatter, a result of the strong nuclear force being repulsive beyond a certain distance. (Correct me if I am wrong)

Now what about a nuclear reactor which has a 100% reflector installed, and only a controlled amount of fissile material is introduced to attain the exact amounts of energy, barring reflector particulars, would that reduce the core size as compared to a conventional fission reactor? What about the neutrons lost due to decay? (Neutrons half life of around 11 minutes or so)
11minutes is a long time in a reactor ... 99% would bounce around inside the area surrounded by the 100% mirror , and be captured ,most likely fissioning another atom ,
If you could make a 100% mirror the critical mass would be grams , the reactor , the size of a matchbox

Last edited by oz93666; Apr 25th 2017 at 10:29 PM.
oz93666 is offline   Reply With Quote
Old Apr 26th 2017, 09:50 AM   #5
Junior Member
 
Join Date: Apr 2017
Posts: 3
Originally Posted by oz93666 View Post
11minutes is a long time in a reactor ... 99% would bounce around inside the area surrounded by the 100% mirror , and be captured ,most likely fissioning another atom ,
If you could make a 100% mirror the critical mass would be grams , the reactor , the size of a matchbox
Thankyou for your comments, I have an idea that can (probably) greatly increase neutron reflection. Will discuss here as soon as I get it to the drawing board.

Last edited by programbot; Apr 26th 2017 at 11:35 AM.
programbot is offline   Reply With Quote
Reply

  Physics Help Forum > Lobby > New Users

Tags
design, elementary, neutrons, nuclear, physics, reactor



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Nuclear physics questions Nforce Nuclear and Particle Physics 8 Jan 1st 2016 06:25 AM
Nuclear Decay scottseptember1992 Nuclear and Particle Physics 0 Jun 3rd 2012 10:33 PM
Separate elementary practcle. jaiii Nuclear and Particle Physics 0 Jul 31st 2011 02:45 AM
Nuclear Physics: Dose Rate bambamm Nuclear and Particle Physics 0 Apr 6th 2011 09:03 PM
Nuclear physics roshanhero Nuclear and Particle Physics 1 Jun 8th 2009 03:28 AM


Facebook Twitter Google+ RSS Feed