Half-life measurement of short-lived nuclide 146Eu

¹⁴⁶Sm is an important nuclide for both geochronological and astrophysical applications, its precise half-life value is essential for accurate geological applications. Nevertheless, significant discrepancies exist in the measured half-life values of ¹⁴⁶Sm. A new experimental method has been proposed by merely measuring the total amount of ¹⁴⁶Eu and the decay of ¹⁴⁶Sm, corresponding α and γ spectrometers have been developed for the measurement. The preliminary experiment has been carried out in HI-13 tandem accelerator of China Institute of Atomic Energy. Based on α and γ measurements, the half-life of ¹⁴⁷Eu has been double checked and the results agree well with existing values, which gives a verification for the reliability of our half-life measurement systems. The half-life of ¹⁴⁶Eu has been updated to $4.21\pm 0.05$ days, which is 9% lower than the value reported in the database. Based on our analysis, this difference has a significant impact on the determination of the number of ¹⁴⁶Eu atoms, and consequently has an equivalent impact on the measurement of ¹⁴⁶Sm half-life.