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4602 > Neutrons > Flashcards

Neutrons Flashcards

1
Q

What is the mass of Neutrons

A

1

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2
Q

Where are neutrons located in the atomic structure?

A

Nucleus

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3
Q

What is a Fast neutron?

A

Any neutron born of fission

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4
Q

What is the energy level of fast neutrons

A

> 0.1 MeV

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5
Q

What is the energy level of intermediate neutrons

A

Between .1Mev to1eV

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6
Q

What is the energy level of slow neutrons

A

<1eV

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7
Q

Define a thermal neutron

A

A neutron at the same energy level as its surroundings

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8
Q

What is a Prompt Neutron

A

A neutron born before 10E-14 sec.

0.00000000000001

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9
Q

What is a delayed neutron

A

Born after 10E-14, usually about 12.7sec.

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10
Q

What is critical

A

When you are creating the same number of neutrons this cycle as the cycle before

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11
Q

What is subcritical

A

Producing less neutrons this cycle than the previous cycle

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12
Q

What is supercritical

A

Producing more neutrons this cycle than the previous cycle

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13
Q

What is atomic mass?

A

Number of Protons and Neutrons

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14
Q

What is the atomic Number?

A

The number of Protons

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15
Q

What is the atomic mass of a Proton

A

1

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16
Q

What charge dose a Proton have

A

Positive

17
Q

What charge does an electron have

A

Negative

18
Q

Name three source neutrons

A

Installed source
Alpha-Neutron Reaction
Photo-Neutron Reaction

19
Q

Name two neutron interactions

A

Scattering (collision)

Absorption

20
Q

What is elastic scattering

A

When a neutron collides with a target nucleus and bounces off.

21
Q

What is inelastic scattering?

A

When a neutron collides with a target nucleus and enters for a short time then a neutron is released from the nucleus.

22
Q

What is radiative capture?

A

When a neutron collides with a poison and is absorbed, no fission accrues.

23
Q

What is fission?

A

When a neutron collides with a target nucleus causing the target nucleus to split into two nuclei of different sizes and it gives off an average of 2.5 neutrons.

24
Q

What are the two origins of neutrons

A

Fission

Source

25
Q

What is the production (release) time for a Delayed Neutron?

A

> 10E-14 sec.

About 12.7 sec.

26
Q

What is the six factor formula?

A 
E  Lf  P Lth  F  N
E= fast fission. +
Lf= Fast fission non-leakage. -
P= Resonance non-losses. -
Lth= Thermal non-leakage. -
F=Thermal neutrons absorb by non fuel atoms. -
N= Reproduction. +
27
Q

What is the Keff if the reactor is subcritical?

A

<1

28
Q

What is the Keff if the reactor is critical?

A

Keff =1

29
Q

What is the Keff if the reactor is supercritical?

A

> 1

30
Q

What holds protons and neutrons together in the nucleus?

A

Binding energy or nuclear energy.

31
Q

What percent of neutrons are prompt.

A

> 99%

32
Q

What is moderation?

A

The slowing down of a neutron.

33
Q

What charge do Neutrons have?

A

None

4602 (5 decks)

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