Editing Neutron (section)

== Sources and production ==
{{Main|Neutron source|Neutron generator|Research reactor}}
Free neutrons are unstable, although they have the longest half-life of any unstable subatomic particle by several orders of magnitude. Their half-life is still only about 10 minutes, so they can be obtained only from sources that produce them continuously.

'''Natural neutron background.''' A small natural background flux of free neutrons exists everywhere on Earth.<ref name="NatNeu">
{{cite journal
|author1= Carson, M.J.
|year= 2004
|title= Neutron background in large-scale xenon detectors for dark matter searches
|journal= [[Astroparticle Physics (journal)|Astroparticle Physics]]
|volume= 21 |pages= 667–687
|doi= 10.1016/j.astropartphys.2004.05.001
|issue= 6 |display-authors=etal|arxiv= hep-ex/0404042|bibcode= 2004APh....21..667C|s2cid= 17887096
}}</ref> In the atmosphere and deep into the ocean, the "neutron background" is caused by [[muon]]s produced by [[cosmic ray]] interaction with the atmosphere. These high-energy muons are capable of penetration to considerable depths in water and soil. There, in striking atomic nuclei, among other reactions they induce spallation reactions in which a neutron is liberated from the nucleus. Within the Earth's crust a second source is neutrons produced primarily by spontaneous fission of uranium and thorium present in crustal minerals. The neutron background is not strong enough to be a biological hazard, but it is of importance to very high resolution particle detectors that are looking for very rare events, such as (hypothesized) interactions that might be caused by particles of [[dark matter]].<ref name="NatNeu"/> Recent research has shown that even thunderstorms can produce neutrons with energies of up to several tens of MeV.<ref name="KohnEbert">{{cite journal |last1=Köhn |first1=C. |last2=Ebert |first2=U. |author2-link=Ute Ebert |title=Calculation of beams of positrons, neutrons and protons associated with terrestrial gamma-ray flashes |journal=[[Journal of Geophysical Research: Atmospheres]] |date=2015 |volume=23 |issue=4 |doi=10.1002/2014JD022229 |pages=1620–1635 |bibcode=2015JGRD..120.1620K |url=https://ir.cwi.nl/pub/23845/23845D.pdf |doi-access=free |access-date=2019-08-25 |archive-date=2019-12-23 |archive-url=https://web.archive.org/web/20191223070457/https://ir.cwi.nl/pub/23845/23845D.pdf |url-status=live }}</ref> Recent research has shown that the fluence of these neutrons lies between 10<sup>−9</sup> and 10<sup>−13</sup> per ms and per m<sup>2</sup> depending on the detection altitude. The energy of most of these neutrons, even with initial energies of 20 MeV, decreases down to the keV range within 1 ms.<ref name="KohnHarakeh">{{cite journal|last1=Köhn |first1=C. |last2=Diniz |first2=G. |last3=Harakeh |first3=Muhsin |title=Production mechanisms of leptons, photons, and hadrons and their possible feedback close to lightning leaders |journal=[[Journal of Geophysical Research: Atmospheres]]|date=2017 |volume=122 |issue=2 |pages=1365–1383 |doi=10.1002/2016JD025445|pmid=28357174 |pmc=5349290 |bibcode=2017JGRD..122.1365K }}</ref>

Even stronger neutron background radiation is produced at the surface of Mars, where the atmosphere is thick enough to generate neutrons from cosmic ray muon production and neutron-spallation, but not thick enough to provide significant protection from the neutrons produced. These neutrons not only produce a Martian surface neutron radiation hazard from direct downward-going neutron radiation but may also produce a significant hazard from reflection of neutrons from the Martian surface, which will produce reflected neutron radiation penetrating upward into a Martian craft or habitat from the floor.<ref>{{cite journal |last1=Clowdsley |url=http://www.physicamedica.com/VOLXVII_S1/20-CLOWDSLEY%20et%20alii.pdf |archive-url=https://web.archive.org/web/20050225054811/http://www.physicamedica.com/VOLXVII_S1/20-CLOWDSLEY%20et%20alii.pdf |url-status=dead |archive-date=2005-02-25 |journal=[[Physica Medica]]|first1=MS |volume=17 |issue=Suppl 1 |last2=Wilson |pages=94–96 |first2=JW |last3=Kim |first3=MH |last4=Singleterry |first4=RC |last5=Tripathi |first5=RK |last6=Heinbockel |first6=JH |last7=Badavi |first7=FF |last8=Shinn |first8=JL |title=Neutron Environments on the Martian Surface |year=2001 |pmid=11770546 }}</ref>

'''Sources of neutrons for research.''' These include certain types of [[radioactive decay]] ([[spontaneous fission]] and [[neutron emission]]), and from certain [[nuclear reaction]]s. Convenient nuclear reactions include tabletop reactions such as natural alpha and gamma bombardment of certain nuclides, often beryllium or deuterium, and induced [[nuclear fission]], such as occurs in nuclear reactors. In addition, high-energy nuclear reactions (such as occur in cosmic radiation showers or accelerator collisions) also produce neutrons from disintegration of target nuclei. Small (tabletop) [[particle accelerator]]s optimized to produce free neutrons in this way, are called [[neutron generator]]s.

In practice, the most commonly used small laboratory sources of neutrons use radioactive decay to power neutron production. One noted neutron-producing [[radioisotope]], [[californium]]-252 decays (half-life 2.65 years) by [[spontaneous fission]] 3% of the time with production of 3.7 neutrons per fission, and is used alone as a neutron source from this process. [[Nuclear reaction]] sources (that involve two materials) powered by radioisotopes use an [[alpha decay]] source plus a beryllium target, or else a source of high-energy gamma radiation from a source that undergoes [[beta decay]] followed by [[gamma decay]], which produces [[photoneutron]]s on interaction of the high-energy [[gamma ray]] with ordinary stable beryllium, or else with the [[deuterium]] in [[heavy water]]. A popular [[startup neutron source|source of the latter type]] is radioactive [[antimony-124]] plus beryllium, a system with a half-life of 60.9 days, which can be constructed from natural antimony (which is 42.8% stable antimony-123) by activating it with neutrons in a nuclear reactor, then transported to where the neutron source is needed.<ref>Byrne, J. ''Neutrons, Nuclei, and Matter'', Dover Publications, Mineola, New York, 2011, {{ISBN|0486482383}}, pp. 32–33.</ref>

[[File:Institut Laue–Langevin (ILL) in Grenoble, France.jpg|thumb|right|[[Institut Laue–Langevin]] (ILL) in Grenoble, France – a major neutron research facility]]

[[Nuclear reactor|Nuclear fission reactors]] naturally produce free neutrons; their role is to sustain the energy-producing [[chain reaction]]. The intense [[neutron radiation]] can also be used to produce various radioisotopes through the process of [[neutron activation]], which is a type of [[neutron capture]].

Experimental [[fusion power|nuclear fusion reactors]] produce free neutrons as a waste product. But it is these neutrons that possess most of the energy and converting that energy to a useful form has proved a difficult engineering challenge. Fusion reactors that generate neutrons are likely to create radioactive waste, but the waste is composed of neutron-activated lighter isotopes, which have relatively short (50–100 years) decay periods as compared to typical half-lives of 10,000 years<ref>{{Cite web|url=https://eesc.columbia.edu/courses/ees/lithosphere/labs/lab12/radioisotope_tutorial.html|title=Isotopes and Radioactivity Tutorial|access-date=2020-04-16|archive-date=2020-02-14|archive-url=https://web.archive.org/web/20200214215448/https://eesc.columbia.edu/courses/ees/lithosphere/labs/lab12/radioisotope_tutorial.html|url-status=dead}}</ref> for fission waste, which is long due primarily to the long half-life of alpha-emitting transuranic actinides.<ref>[http://news.bbc.co.uk/1/hi/sci/tech/4627237.stm Science/Nature |Q&A: Nuclear fusion reactor] {{Webarchive|url=https://web.archive.org/web/20220225092021/http://news.bbc.co.uk/1/hi/sci/tech/4627237.stm |date=2022-02-25 }}. BBC News (2006-02-06). Retrieved on 2010-12-04.</ref> Some [[nuclear fusion-fission hybrid]]s are proposed to make use of those neutrons to either maintain a [[subcritical reactor]] or to aid in [[nuclear transmutation]] of harmful long lived nuclear waste to shorter lived or stable nuclides.

=== Neutron beams and modification of beams after production ===
Free neutron beams are obtained from [[neutron source]]s by [[neutron transport]]. For access to intense neutron sources, researchers must go to a specialized [[neutron research facility|neutron facility]] that operates a [[research reactor]] or a [[spallation]] source.

The neutron's lack of total electric charge makes it difficult to steer or accelerate them. Charged particles can be accelerated, decelerated, or deflected by [[electric field|electric]] or [[magnetic field]]s. These methods have little effect on neutrons. But some effects may be attained by use of inhomogeneous magnetic fields because of the [[neutron magnetic moment|neutron's magnetic moment]]. Neutrons can be controlled by methods that include [[neutron moderator|moderation]], [[neutron reflector|reflection]], and [[neutron-velocity selector|velocity selection]]. [[Thermal neutron]]s can be polarized by transmission through [[magnet]]ic materials in a method analogous to the [[Faraday effect]] for [[photon]]s. Cold neutrons of wavelengths of 6–7 angstroms can be produced in beams of a high degree of polarization, by use of [[neutron supermirror|magnetic mirrors]] and magnetized interference filters.<ref>Byrne, J. ''Neutrons, Nuclei, and Matter'', Dover Publications, Mineola, New York, 2011, {{ISBN|0486482383}}, p. 453.</ref>