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Hvis du mener, at du er blevet blokeret ved en fejl, kan du finde yderligere oplysninger og instruktioner i den globale politik <a href="https://meta.wikimedia.org/wiki/Special:MyLanguage/No_open_proxies" class="extiw" title="m:Special:MyLanguage/No open proxies">Ingen åbne proxyer</a>. </p> Du kan også diskutere blokeringen ved at <a href="https://meta.wikimedia.org/wiki/Steward_requests/Global" class="extiw" title="m:Steward requests/Global">lægge en anmodning om gennemgang på Meta-Wiki</a>. ⧼wikimedia-globalblocking-blockedtext-mistake-e-mail-steward⧽</div></div><hr /> <p>Du kan se og kopiere kildeteksten for denne side </p><textarea readonly="" accesskey="," id="wpTextbox1" cols="80" rows="25" style="" class="mw-editfont-monospace" lang="da" dir="ltr" name="wpTextbox1">== Historie == Eksistensen af neutrinoen blev foreslået af [[Wolfgang Pauli]] i [[1930]] som en løsning på et problem, som blevet påvist i 1914 af [[James Chadwick]]. Problemet bestod i at elektronerne, som blev udsendt ved [[betastråling]] ikke blev udsendt ved en bestemt energi.<ref name=Denlilleneutron /> I betastråling bliver en [[neutron]] omdannet til en [[proton]] under udsendelse af en elektron. I følge energibevarelsesprincippet skulle elektronen så udsendes med energi, der er lig med masseforskellen mellem neutron og protonen<ref name=neutrinoensmassebestemmes />, men Chadwick viste at de blev udsendt med energier mellem 0 og masseforskellen.<ref name=Denlilleneutron /> Der manglede altså noget energi. Wolfgang Pauli foreslog at der fandtes en partikel som bar den manglede energi væk. Denne partikel måtte ikke vekselvirke med den elektromagnetiske kraft, idet den derved ville være fundet.<ref name=Denlilleneutron /> Han kaldte denne partikel neutron pga. deres [[Elektrisk ladning|ladning]].<ref name=entotre>{{cite web | url = http://ing.dk/artikel/108976-der-var-en-der-var-to-der-var-tre-neutrinoer-og-maaske-er-der-flere-endnu | title = Der var en, der var to, der var tre neutrinoer - og måske er der flere endnu? | access-date = 26. maj 2011 | last = Ramskov | first = Jens | date = 21. maj 2010 | publisher = [[Ingeniøren]] | archive-date = 4. april 2011 | archive-url = https://web.archive.org/web/20110404001814/http://ing.dk/artikel/108976-der-var-en-der-var-to-der-var-tre-neutrinoer-og-maaske-er-der-flere-endnu | url-status = dead }}</ref> I 1932 fandt James Chadwick en neutral partikel, som han også kaldte [[Neutron|neutronen]].<ref name=entotre /> Denne partikel havde en for stor masse til at være Paulis føromtalte partikel. [[Enrico Fermi]] gav derfor Paulis hypotetiske partikel navnet neutrino og formulerede herefter [[kvanteteori]]en for betahenfald.<ref name=Denlilleneutron /> [[Frederick Reines]] og [[Clyde Cowan]] foreslog i 1953 et eksperiment for at opdage neutrinoen, hvor en neutrino vekselvirker med en proton og skaber en neutron og en [[positron]].<ref name=nobel>{{cite web | url = http://nobelprize.org/nobel_prizes/physics/laureates/1995/add-back.html | title = Additional background material on the Nobel Prize in Physics 1995 | access-date = 3. juni 2011 | publisher = Nobelprize.org | language = engelsk }}</ref> :<math>\bar{v} + p \longrightarrow n + e^+</math> Reines og Cowan placerede deres eksperiment ved [[Hanford reactor]] men pga. for meget baggrundstråling mislykkedes eksperimentet. Forskerne placerede herefter forsøget under jorden ved [[Savannah River Plant]], hvor et neutrinosignal blev observeret.<ref name=nobel /> Resultaterne blev fremlagt i 1956.<ref name=History>{{cite web | url = http://icecube.wisc.edu/info/neutrinos/1956.php | title = IceCube: Neutrino History - 1956 | access-date = 8. juni 2011 | date = 19. december 2010 | language = engelsk | archive-date = 7. juli 2010 | archive-url = https://web.archive.org/web/20100707123809/http://www.icecube.wisc.edu/info/neutrinos/1956.php |url-status=dead }}</ref> Reines fik nobelprisen i fysik i 1995 for denne opdagelse. (Cowan var død mange år tidligere).<ref name=Denlilleneutron /> I 1962 blev myonneutrinoen opdaget af forskerne [[Leon M. Lederman]], [[Melvin Schwartz]], [[Jack Steinberger]].<ref name=SolarProblem>{{cite web | url = http://www.tp.umu.se/space/Proj_09/Martin_Lahrz-09.pdf | title = The Solar Neutrino Problem | access-date = 6. oktober 2011 | language = engelsk | last = Lahr | first = Martin | publisher = University Umeå }}</ref> Dette fik forskerne nobelprisen i fysik for i 1988.<ref name=nobel98>{{cite web | url = http://www.nobelprize.org/nobel_prizes/physics/laureates/1988/press.html | title = The Nobel Prize in Physics 1988: Press Release | access-date = 6. oktober 2011 | publisher = Nobelprize.org | language = engelsk }}</ref> I 1967 målte [[Ray Davis]], som den første neutrinoer fra [[solen]]s [[kernefusion|fusionsreaktioner]]. Han så på reaktionen, at når en elektronneutrino reagerer med et Cl<sub>37</sub> skabes der Ar<sub>37</sub> og en elektron. :<math>Cl_{37} + \bar{v} \longrightarrow Ar_{37} + e^-</math> En elektronneutrino skal have en energi på mindst 0,814 [[Elektronvolt|MeV]] for at kunne indgå i denne reaktion. Det vil sige omkring 12 % af solens neutrinoer, neutrinoerne får forskellig flavour alt afhængig af hvilken [[P-P-kæde|pp-reaktion]] de indgår i i solen. Der blev bygget en tank indeholdende 378000 liter [[tetrachlorethylen|C<sub>2</sub>Cl<sub>4</sub>]] i [[Homestake-minen]] i ca. 1500 m. dybde. Den blev bygget så dybt for at undgå fejlkilder fra den [[kosmiske stråling]]. Antallet af neutrinoer der reagerede blev så målt ved at se på hvor mange argonatomer der blev skabt. Resultatet fra forsøget viste at der kun blev skabt en tredjedel af de neutrinoer, som var teoretisk beregnet.<ref name=MissingNeutrinos>{{cite web | url = http://www.tp.umu.se/space/Proj_05/Kerstin.F.pdf | title = The Problem of the Missing Neutrinos | date = 20. november 2005 | access-date = 6. oktober 2011 | language = engelsk | last = Falk | first = Kerstin | publisher = University Umeå }}</ref> I 1996 blev detektoren [[Super Kamiokande]] taget i brug og observervationer fra denne viste, at der var en uoverensstemmelse imellem det teoretiske antal neutrinoer fra solen og det fundne. I 1998 viste Super Kamiokande at det skyldes neutrinooscillationen.<ref name=Denlilleneutron /> I 1999 blev [[The Sudbury Neutrino Observatory|The Sudbury Neutrino Observatory]] (SNO) taget i brug. SNO var et neutrinoobservatorium, som befandt sig 2100 m under jordens overflade i [[Creighton-minen]] i Sudbury, Ontario, Canada. Detektoren var designet til at registrere neutrinoer som kom fra Solen gennem deres interaktion med en meget stor tank med tungt vand. Detektoren var aktiv frem til 2006. SNO samarbejdet fortsatte i adskillige år med at analysere data fra eksperimentet. På Super Kamiokande måltes kosmiske neutrinoer. Når en neutrino kolliderer med et vandmolekyle i tanken, dannes en hurtig elektrisk ladet partikel. Herved udsendes såkaldt [[Cherenkovstråling]], som måles af lyssensorer i eksperimentet. Formen og intensiteten af Cherenkovstrålingen afslører, hvilken type neutrino, der har forårsaget den, og hvor den kom fra. Det viste sig, at muon-neutrinoer, som ankom direkte fra atmosfæren var mere talrige end dem, der havde rejst tværs gennem Jorden. Det antydede, at de sidstnævnte havde rejst længere og derfor havde haft længere tid til at skifte identitet til en anden type neutrino undervejs. På The Sudbury Neutrino Observatory målte man neutrinoer fra Solen som kun producerer elektron-neutrinoer. Reaktionerne mellem neutrinoer og det tunge vand i tanken gav mulighed for at måle både elektron-neutrinoer og alle tre neutrinoer i kombination. Man opdagede derved, at der var færre elektron-neutrinoer end forventet, mens antallet af de tre typer neutrinoer tilsammen var som forventet. 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