Article
Article
Analog states
Article By:
Horen, Daniel J. Nuclear Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee.
Last reviewed:October 2019
DOI:https://doi.org/10.1036/1097-8542.031700
States in neighboring nuclear isobars that have the same total angular momentum, parity, and isotopic spin. They also have nearly identical nuclear structure wave functions except for the transformation of one or more neutrons into an equivalent number of protons, which occupy the same single-particle states as the neutrons. Analog states (or isobaric analog states, IAS) have been observed throughout the periodic table, indicating that isotopic spin is a good quantum number. See also: Angular momentum; I-spin; Isobar (nuclear physics); Nuclear structure; Parity (quantum mechanics)
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