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nuclear magneton
noun
The unit of magnetic moment used to describe nucleons such as the proton.
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A similar unit for magnetic moments of nuclei, protons, and neutrons is the nuclear magneton (equivalent to 5.051 × 10−27 ampere square metre).
The nuclear magneton, calculated by using the mass of the proton (rather than that of the electron, used to calculate the Bohr magneton) equals 1/1,836 Bohr magneton.
Higher accuracy has since been claimed by other groups using atom interferometry, based on the three orders of magnitude larger value of the Bohr magneton compared with the nuclear magneton.
The change is consistent with the loss of a splitting from a slowly exchanging proton that has been replaced by a deuteron; deuterons have a spin of 1, however the value of the nuclear magneton of a deuteron is only about 15% of that of a proton.
Based on the involved Mo nuclear magnetic moment strength μn = gnβnI = −0.37βnI (where g n and βn represent the nuclear g factor an nuclear magneton, respectively) [20] and natural isotopic abundance, this makes it unlikely the defect to concern a Mo-centered unpaired electron defect.
As noted by Fermi, the latter may be written as Equation (2): (2) with ge, gi, μ0, μb, μn and | ϕ(0)| as the electron spin g factor, the nuclear spin g factor, the vacuum permeability, the Bohr magneton, the nuclear magneton and the electron spin density at the nucleus, respectively.
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These instruments enjoyed widespread use in studies of the isotopes of helium and of other noble gases in natural and technogenic samples, as well as in precision measurements of fundamental physical constants, in particular, of the magnetic moment of the proton in nuclear magnetons and of the tritium half-life.
Applying the method to hydrogen, they found that the moment of a proton was 2.785±0.02 nuclear magnetons, and not 1 as predicted by the then-current theory, while that of a deuteron was 0.855±0.006 nuclear magnetons.
(One Bohr magneton equals 9.274009994 × 10−24 ampere times square metre).
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