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jumpjack
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How much energy does a neutron need to be able to split an atom and start nuclear fission?
jumpjack said:How much energy does a neutron need to be able to split an atom and start nuclear fission?
jumpjack said:Could an electron ever have enough energy to be able to impact a nuclueus?
I know. But I don't know how to calculate how much kinetic energy 20 MA give to an electron.Astronuc said:2 MA is just current. One has to look at the potential or kinetic energy of the electrons.
jumpjack said:I know. But I don't know how to calculate how much kinetic energy 20 MA give to an electron.
QuantumPion said:It's very simple. If you want to give an electron 1 eV of energy, you need a potential difference of 1 V. That's where the name http://en.wikipedia.org/wiki/Electronvolt" comes from.
Ampere is a measure of current, which the number of charges passing through a given area per unit time. Current does not indicate anything about energy. One would need to know the potential or velocity of the charges.jumpjack said:I think this does not answer at all my question:
how many eV do 20 mln Ampere give to an alectron?
Indeed I didn't say "current is energy", but "current gives energy" (sorry, don't know the proper english term).Astronuc said:Ampere is a measure of current, which the number of charges passing through a given area per unit time. Current does not indicate anything about energy.
Electrons under 5 MeV (5 million volts) can knock neutrons out of several elements, such as deuterium and beryllium. The electron-in, neutron-out energy threshold is essentially the same as the gamma,neutron reaction, except there is an extra vertex in the electron,neutron interaction, which reduces the yield (cross section).jumpjack said:Could an electron ever have enough energy to be able to impact a nuclueus?
Bob S said:Electrons under 5 MeV (5 million volts) can knock neutrons out of several elements, such as deuterium and beryllium. The electron-in, neutron-out energy threshold is essentially the same as the gamma,neutron reaction, except there is an extra vertex in the electron,neutron interaction, which reduces the yield (cross section).
Bob S
Because current is not volts, I will answer your question this way.jumpjack said:Thanks.
Is it possible to calculate if 20 MAmpere can put into an electron such an energy? (in form of kinetic energy)
Does this mean that 20,000,000 amps would create a 300,000,000,000 (300 GeV) "spark"?!?Bob S said:Because current is not volts, I will answer your question this way.
Two (2) amps into an automobile ignition system will create a 30,000 volt spark (30 keV electrons).
Bob S
jumpjack said:I think this does not answer at all my question:
how many eV do 20 mln Ampere give to an alectron?
jumpjack said:BTW, I think "current is no volts" matches with "force is not speed".
But the former "causes" the latter.
QuantumPion said:The question is meaningless because amperes is a measure of current, not voltage. It's like asking how many miles per hour do you need to push a rock up a hill.
You are backwards. Voltage is the force that drives a current.
jumpjack said:Hence the more high is the current, the more high is the energy of electrons it moves.
Is this correct?
jumpjack said:Hence, those 20 MA do give electrons a very high energy.
We estimated this energy is around 300 GeV (I don't know how correct this calculation could be).
Are 300 GeV enough for an electron to pass through "electrons cloud" around a nucleus and split the nucleus itself?
But as I said, to produce 20 MAmpere you'd need quite an high Voltage in the z-machine.QuantumPion said:No. Current is a measure of the number of electrons flowing per second. Current does not "give electrons energy", the potential difference due to an electric field (i.e. voltage) does.
https://www.physicsforums.com/showpost.php?p=2975303&postcount=14" and 15 of this thread itself. But I'm just guessing (post #15) from what I read in post #14.I have no idea where you got the relation of 20 MA to 300 GeV.
So, how many eV do electrons in z-machine have? All I know is that in z-machine 20 MAmpere are produced, and 2.000.000.000°C are reached.To create 300 GeV electrons (which would be very difficult to do due to pair production) you would need a voltage of 300 GV. If you wanted 20 MA of current at 300 GV you would need 6 billion gigawatts of power. For comparison, the electric generation capacity of the entire world is about 5000 gigawatts.
If you wanted 20 MA of current at 300 GV you would need 6 billion gigawatts of power. For comparison, the electric generation capacity of the entire world is about 5000 gigawatts.
Originally designed to supply 50 terawatts of power in one fast pulse, technological advances resulted in an increased output of 290 terawatts, enough to study nuclear fusion. Z releases 80 times the world's electrical power output for about seventy nanoseconds
jumpjack said:But as I said, to produce 20 MAmpere you'd need quite an high Voltage in the z-machine.
jumpjack said:https://www.physicsforums.com/showpost.php?p=2975303&postcount=14" and 15 of this thread itself. But I'm just guessing (post #15) from what I read in post #14.
jumpjack said:So, how many eV do electrons in z-machine have? All I know is that in z-machine 20 MAmpere are produced, and 2.000.000.000°C are reached.
jumpjack said:From wikipedia:
Your post: 6 billion GW = 6000 TW
Wikipedia: 290 TW
6000/290 =~ 20
Hence rather than 300 Gev, I guesss they would be 300/20 = 15 GeV .
edit:
my mistake, 6 billion GW = 6,000,000 TW
Hence 6,000,000/290 = 20,000
300/20,000 = 0.015 GeV = 15 MeV
Neutron energy refers to the kinetic energy of a neutron, which is a subatomic particle found in the nucleus of an atom. In nuclear fission, high-energy neutrons are used to split apart the nucleus of a heavy atom, releasing energy in the form of heat and radiation.
Neutron energy is controlled through a process called neutron moderation. This involves using a material, such as water or graphite, to slow down the high-energy neutrons and make them more likely to interact with other atoms, causing a chain reaction in the nuclear fuel.
Yes, neutron energy is the main source of energy in nuclear power plants, where it is used to produce heat that is then converted into electricity. Neutron energy can also be used for other applications, such as medical imaging and cancer treatment.
Fast neutrons have higher energies and are more efficient at causing nuclear fission reactions, while thermal neutrons have lower energies and are more likely to be absorbed by the nucleus without causing fission. Nuclear reactors can use different types of fuel and moderators to control the ratio of fast and thermal neutrons.
The energy of a neutron is typically measured in electron volts (eV). In nuclear fission, the energy of the neutrons can range from a few eV up to several million eV. Instruments such as neutron detectors are used to measure the energy and intensity of neutrons in a fission reaction.