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|Title:||Underground Search for the Decay of 180Tam|
|Authors:||HULT MIKAEL; GASPARRO JOEL; MARISSENS GERD; LINDAHL PATRIC; WAETJEN UWE; JOHNSTON Peter N.; WAGEMANS Cyriel; KOEHLER Matthias|
|Citation:||PHYSICAL REVIEW C vol. 74 no. 5 p. 054311-1 to 054311-5|
|Publisher:||AMERICAN PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||Tantalum-180m is a very rare primordial isotope and is not in its nuclear ground state. The radioactivity of 180Tam has not yet been observed. Previous attempts to measure the half-life of 180Tam have been performed using various detectors located above ground. In this work a 606 g Ta disk of natural isotopic composition was measured for 170 days in the 225 m deep underground laboratory HADES. The new lower bound for the half life is 1.7·1016 years for electron capture decay and 1.2·1016 years for β--decay. This gives a total lower bound for the half-life of 7.1·1015 years, which is a factor of 6 higher than the previous lower bound.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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