Editing Beta decay (section)

===Non-conservation of parity===
In 1956, [[Tsung-Dao Lee]] and [[Chen Ning Yang]] noticed that there was no evidence that [[parity (physics)|parity]] was conserved in weak interactions, and so they postulated that this symmetry may not be preserved by the weak force. They sketched the design for an experiment for testing conservation of parity in the laboratory.<ref>{{cite journal
 |last1=Lee |first1=T. D.
 |last2=Yang |first2=C. N.
 |year=1956
 |title=Question of Parity Conservation in Weak Interactions
 |journal=[[Physical Review]]
 |volume=104 |issue=1
 |pages=254–258
 |bibcode=1956PhRv..104..254L
 |doi=10.1103/PhysRev.104.254
|doi-access=free
 }}</ref> Later that year, [[Chien-Shiung Wu]] and coworkers conducted the [[Wu experiment]] showing an asymmetrical beta decay of [[cobalt-60|{{SimpleNuclide|cobalt|60}}]] at cold temperatures that proved that parity is not conserved in beta decay.<ref name="Wu1957" >{{cite journal
 |last1=Wu |first1=C.-S.
 |last2=Ambler |first2=E.
 |last3=Hayward |first3=R. W.
 |last4=Hoppes |first4=D. D.
 |last5=Hudson |first5=R. P.
 |year=1957
 |title=Experimental Test of Parity Conservation in Beta Decay
 |journal=[[Physical Review]]
 |volume=105 |issue=4
 |pages=1413–1415
 |bibcode=1957PhRv..105.1413W
 |doi=10.1103/PhysRev.105.1413
|doi-access=free
 }}</ref><ref>{{cite web|url=http://blogs.scientificamerican.com/guest-blog/2013/10/15/channeling-ada-lovelace-chien-shiung-wu-courageous-hero-of-physics/|title=Channeling Ada Lovelace: Chien-Shiung Wu, Courageous Hero of Physics| first=Maia|last=Weinstock | website=scientificamerican.com}}</ref> This surprising result overturned long-held assumptions about parity and the weak force. In recognition of their theoretical work, Lee and Yang were awarded the [[Nobel Prize for Physics]] in 1957.<ref>{{cite web |url=https://www.nobelprize.org/nobel_prizes/physics/laureates/1957/ | title=The Nobel Prize in Physics 1957 |publisher=[[The Nobel Foundation]] |access-date=March 24, 2015}}</ref> However Wu, who was female, was not awarded the Nobel prize.<ref>{{cite web|last=Webb| first=Richard| title=Chien-Shiung Wu {{!}} Particle physicist denied a Nobel prize| website=newscientist.com| url=https://www.newscientist.com/people/chien-shiung-wu/| access-date=February 18, 2025}}</ref>