High precision half-life measurement of the extinct radio-lanthanide Dysprosium-154.

ABSTRACT: Sixty years after the discovery of ¹⁵⁴Dy, the half-life of this pure alpha-emitter was re-measured. ¹⁵⁴Dy was radiochemically separated from proton-irradiated tantalum samples. Sector field- and multicollector-inductively coupled plasma mass spectrometry were used to determine the amount of ¹⁵⁴Dy retrieved. The disintegration rate of the radio-lanthanide was measured by means of α-spectrometry. The half-life value was determined as (1.40 ± 0.08)∙10⁶ y, with an uncertainty reduced by a factor of ~ 10 compared to the currently adopted value of (3.0 ± 1.5)∙10⁶ y. This precise half-life value is useful for the the correct testing and evaluation of p-process nucleosynthetic models using ¹⁵⁴Dy as a seed nucleus or as a reaction pr

SUBMITTER: Chiera NM 

PROVIDER: S-EPMC9148308 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature