Gyromagnetic ratio definition

It is traditional to rewrite the definition of the nuclear magnetic moment in terms of magnetons and include a constant of proportionality called the gyromagnetic ratio or simply g factor ... 

Although under the definition of low-y nuclei adopted in this chapter only one of the Ba nuclei ( Ba) falls into this category, both will be discussed here. Both nuclei are spin I = 2 and have small gyromagnetic ratios (see Chapter 1, Table 1.2). Although both nuclei have been used in NMR studies of isotopically-enriched samples, the slightly greater natural abundance of - Ba (11.32% by comparison with 6.6% for Ba) makes it more favourable for studying unenriched samples. 

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