### nucleon:

Neutron
* Many neutron stars emit radio radiation in the form of short pulses at very regular intervals
  - spin a dozen or more times per second, emitting jets of X-rays
* Some neutron stars emit radio waves that pulse on and off
  - stars, however, also emit electromagnetic radiation by another mechanism
* absorbed by the deuterium create a source of marketable tritium.
* act quite differently.
* add stability to nucleus.
* affect the mass and stability of the nucleus.
* also activate the things they hit as the neutrons are absorbed by nearby atoms
  - adds atomic mass
  - have significant mass but no electrical charge
* are a great way to explore the internal magnetic fields inside matter
  - weak probe of matter
* are about as massive as protons, so they freeze out at the same time as protons
  - the same size as protons
  - absorbed by nuclei of atoms in a nuclear reaction
  - again the same but with one up quark and two down quarks
  - also baryons
  - an essential tool in science
  - approximately equal in mass to the proton and have no electric charge
  - degenerate
  - effective against large tumors
* are electrically neutral and have no bearing on chemical properties
  - of approximately the same mass as protons
  - elementary particles which are emitted during certain types of nuclear reactions
  - emitted when large atomic nuclei are bombarded with alpha particles
  - essential to starting and sustaining a chain reaction
  - found in all atoms except for most atoms of hydrogen
  - good at showing where there are hydrogen atoms, which are found in all liquids
  - have no charge and are nuclear particles
  - heavy, uncharged particles that cause the atoms that they strike to become ionized
  - liberated through radiation and react with other elements through collision
  - made of quarks
  - many times more health harming than any other radiations
  - more dangerous then radiation of the same energy and intensity
* are neutral particles in the nucleus of the atom
  - that have no electric charge
  - with approximately the same mass as a proton
* are neutral, as their name implies
  - they have no charge
  - never charged, they are neutral
  - nucleons
* are one of three basic particles that make up the atom
  - two major particles comprising the nucleus of atoms
  - part of atoms
* are particles which are also very penetrating
  - within the nucleus that have no charge
  - particularly useful because they have no electric charge
  - produced copiously in nuclear fission and fusion
  - similar to protons but possess no electronic charge and are slightly heavier
* are subatomic particles that are continually ejected from the lunar soil by cosmic rays
  - with a positive charge
* are subatomic particles with no electric charge that are extraordinarily useful
  - the key to nuclear chain reactions , nuclear power and nuclear weapons
* are the particles in an atom that have a neutral charge
  - that sustain a chain reaction in a nuclear reactor
  - tiny particles found in the nuclei of atoms
* are uncharged atomic particles that have the ability to penetrate living tissues
  - particles found in nearly all matter
* are uncharged particles found within atomic nuclei
  - from the nucleus of the atom
  - in the nucleus with a mass nearly equal to the proton's mass
  - useful for studying atomic structure
  - unstable unless combined with a proton
  - used to make nuclear fission reactions occur
  - very efficient at inducing transformation in rodent and human cellular systems
* are, as the name implies, neutral in their charge.
* behave in the same way, and are damaging at all energy levels.
* bind with protons with the residual strong force.
* can also help to work out the structure of new molecules and crystals
  - interact with spin waves in magnets
  - elastically scatter off nuclei, causing the struck nucleus to recoil
  - exist in a free state
  - induce nuclear reactions readily, and they are products of many reactions
  - interact with nuclei and transmute stable nuclides into radioactive nuclides
* carry no charge and have a mass only slightly heavier than that of protons
  - net charge
* consist of one up quark and two down quarks.
* contain one up quark and two down quarks.
* determine the isotope and overall stability of the nucleus.
* enter the water and are slowed down.
* exist below the crust.
* have a lifetime in the trap limited primarily by their beta-decay
  - mass that is nearly identical to that of protons and have no electrical charge
  - many uses in the quantification of elements in the body
* have no charge and are also highly penetrating
  - protons are positively charged
  - weigh about the same as a proton
  - charge, they are neutral
* have no electrical charge, but protons have a positive charge
  - net electrical charge force
  - spins
* have the same mass as protons, but they carry no charge
  - weight as protons but no electrical charge
* interact strongly with hydrogen, deuterium and oxygen atoms.
* interact with protons to form nuclei of deuterium, or heavy hydrogen
  - the nucleus itself
* ionize indirectly by colliding with atomic nuclei.
* lose predictable amounts of energy when they bounce off water's hydrogen atoms.
* make it possible to follow the change of atomic structures over time.
* moderate the repulsive forces between the protons.
* normally collide with small nuclei and are slowed down before absorption.
* play a major role in the mass and radioactive properties of atoms
  - vital role in many areas of science and technology
* prevent the squashing of the interstitial space.
* stars emit circular polarized light
  - intense X-rays
  - in massive binary systems
* trigger the nuclear chain reaction.
* weaken metal by making it more brittle.
+ Atomic nucleus: Nuclear physics :: Matter
  * Neutrons have no charge and protons are positively charged. Because the nucleus is only made up of protons and neutrons it is positively charged. Things that have the same charge repel each other. Unless there was something else holding the nucleus together it could not exist because the protons would push away from each other. The nucleus is actually held together by a force called the strong nuclear force.
  * Neutrons and protons are found in the nucleus of an atom. Unlike protons, which have a positive charge, or electrons, which have a negative charge, neutrons have zero charge. Neutrons bind with protons with the residual strong force.
+ Neutron, Atomic reactions: Subatomic particles :: Basic physics ideas