Isotopes of neodymium
Naturally occurring neodymium (Nd) is composed of 5 stable isotopes, Nd, Nd, Nd, Nd and Nd, with Nd being the most abundant (27.2% natural abundance), and 2 long-lived radioisotopes, Nd and Nd. In all, 33 radioisotopes of neodymium have been characterized up to now, with the most stable being naturally occurring isotopes Nd (alpha decay, a half-life (t) of 2.29×10 years) and Nd (double beta decay, t of 7×10 years). All of the remaining radioactive isotopes have half-lives that are less than 12 days, and the majority of these have half-lives that are  less than 70 seconds; the most stable artificial isotope is Nd with a half-life of 10.98 days. This element also has 13 known meta states with the most stable being Nd (t 5.5 hours), Nd (t 5.5 minutes) and Nd (t ~70 seconds). The primary decay modes before the most abundant stable isotope, Nd, are electron capture and positron decay, and the primary mode after is beta decay. The primary decay products before Nd are element praseodymium isotopes and the primary products after are element promethium isotopes.