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How many neutrons have an atom with a mass number of 20 and 11 neutrons?
How many neutrons would it have if it had 11 neutrons? 11.
What is the number of neutrons in phosphorus-31?
the number of neutrons is mass
How many neutrons are in Cu-63?
Number of neutrons = Mass number - Atomic number = 63 - 29 = 34 neutrons
How many neutrons are in Na?
12 neutrons are in sodium (Na).
How many protons and neutrons are in dysprosium?
there are 66 protons & 97 neutrons
Why you use slow neutrons instead of fast neutrons in nuclear reaction?
in reacter U-235 fission is due to slow neutrons because in reacter the probability of fission from fast neutron is approximatly zero.
Why fast neutrons are not captured by nucleus?
Fast neutrons have high kinetic energy, making them less likely to interact with the nucleus compared to slow neutrons. The high energy of fast neutrons means they often pass through the nucleus without being captured. As a result, fast neutrons are less effective in inducing nuclear reactions compared to slower neutrons.
What uranium nucleus is fissile?
The isotopes 233U and 235U are fissile with thermal neutrons and the isotope 238U is fissile with fast neutrons.
Is moderation of neutrons always used to slow nuclear fission?
No, moderation of neutrons is not always used to slow nuclear fission. In some types of nuclear reactors, such as fast breeder reactors, fast neutrons are intentionally not moderated to slow down the fission process. These reactors operate using fast neutrons to sustain a chain reaction. However, in most commercial nuclear reactors, moderation of neutrons is employed to slow down the fission process and maintain a controlled chain reaction.
What is a moderator when it concerns nuclear energy?
A moderator is a material that slows fast neutrons.
U-235 undergoes fission by fast or slow?
U-235 can fission by absorbing fast or slow neutrons, but it has a much larger cross section for slow ones, that is it absorbs slow neutrons much more readily than fast ones. This enables moderated reactors to operate with low enriched (5% or less) or even natural uranium, whilst fast reactors must have much more highly enriched uranium, ie with more U-235. The ultimate is the nuclear bomb, where almost pure U-235 will fission entirely with fast neutrons, if enough of it is suddenly put together.
What is the difference between fast and slow neutrons?
The difference between fast and slow neutrons is in the amount of energy they possess. Fast neutrons tend to "blow through" the nucleus of some isotopes. This causes a disruption but, because they don't stay around, the nucleus restabilizes. Slow, or thermal, neutrons, however, may get absorbed by the same nucleus, which then destabilizes, causing fission. It should be pointed out that nuclei of different isotopes are affected differently by neutrons. 238U is caused to divide more frequently by a faster neutron, while 235U is caused to divide more frequently by thermal (slower) neutrons, and 233U is caused to divide more or less equally by any.
Why is moderator not required in modern fast reactors?
a moderator would slow the neutrons, hindering breeding
Can fast neutron and photon have same speed?
No, a photon always moves at the speed of light, and nothing with non-zero mass (which includes neutrons) can move that fast
Uranium 238 can be triggered to split when it is struck by?
Uranium-238 is fissionable only by bombardment with fast neutrons.
When were uranium atoms split?
Uranium atoms are split during nuclear fission. Uranium-235 and uranium-233 are fissile with thermal neutrons and uranium-238 is fissile with fast neutrons.
Why moderator is not required in fast reactors?
a moderator would slow the neutrons, hindering breeding
