180mTa is the rarest naturally occurring quasistable isotope and the longest lived metastable state which is known. Its possible decay via the β− or the electron capture channel has never been observed. This article presents a search for the decay of 180mTa with an ultralow background Sandwich HPGe γ spectrometry setup in the HADES underground laboratory. No signal is observed and improved lower partial half-life limits are set with a Bayesian analysis to 5.8 × 1016 yr for the β− channel and 2.0 × 1017 yr for the electron capture channel
(90 % credibility). The total half-life of 180mTa is longer than 4.5 × 1016 yr. This is more than a factor of two improvement compared to previous searches.
LEHNERT B.;
HULT Mikael;
LUTTER Guillaume;
ZUBER K.;
2017-04-26
AMER PHYSICAL SOC
JRC106514
2469-9985,
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.95.044306,
https://publications.jrc.ec.europa.eu/repository/handle/JRC106514,
10.1103/PhysRevC.95.044306,
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