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Today only the time-differential perturbed angular correlation ('''TDPAC''') is used.
== History and
[[File:Koinzidenzdetector.png|thumb|right|Coincidence measurement in simplified depiction.]]
PAC goes back to a theoretical work by Donald R. Hamilton <ref>{{cite journal | last=Hamilton | first=Donald R. | title=On Directional Correlation of Successive Quanta | journal=Physical Review | publisher=American Physical Society (APS) | volume=58 | issue=2 | date=1940-07-15 | issn=0031-899X | doi=10.1103/physrev.58.122 | pages=122–131| bibcode=1940PhRv...58..122H }}</ref> from 1940. The first successful experiment was carried out by Brady and Deutsch <ref>{{cite journal | last1=Brady | first1=Edward L. | last2=Deutsch | first2=Martin | title=Angular Correlation of Successive Gamma-Ray Quanta | journal=Physical Review | publisher=American Physical Society (APS) | volume=72 | issue=9 | date=1947-11-01 | issn=0031-899X | doi=10.1103/physrev.72.870 | pages=870–871| bibcode=1947PhRv...72..870B }}</ref> in 1947. Essentially spin and parity of nuclear spins were investigated in these first PAC experiments. However, it was recognized early on that electric and magnetic fields interact with the nuclear moment,<ref>{{cite journal | last1=Aeppli | first1=H. | last2=Bishop | first2=A. S. | last3=Frauenfelder | first3=H. | last4=Walter | first4=M. | last5=Zünti | first5=W. | title=Influence of the Atomic Shell on Nuclear Angular Correlation in Cd<sup>111</sup> | journal=Physical Review | publisher=American Physical Society (APS) | volume=82 | issue=4 | date=1951-05-15 | issn=0031-899X | doi=10.1103/physrev.82.550 | pages=550| bibcode=1951PhRv...82..550A }}</ref> providing the basis for a new form of material investigation: nuclear solid-state spectroscopy.
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