Underground search for the decay of Ta180m

Hult, M, Gasparro, J, Marissens, G, Lindahl, P, Watjen, U, Johnston, P, Wagemans, C and Kohler, M 2006, 'Underground search for the decay of Ta180m', Physical Review C - Nuclear Physics, vol. 74, no. 5, pp. 054311-1-054311-5.

Document type: Journal Article
Collection: Journal Articles

Title Underground search for the decay of Ta180m
Author(s) Hult, M
Gasparro, J
Marissens, G
Lindahl, P
Watjen, U
Johnston, P
Wagemans, C
Kohler, M
Year 2006
Journal name Physical Review C - Nuclear Physics
Volume number 74
Issue number 5
Start page 054311-1
End page 054311-5
Total pages 5
Publisher American Physical Society
Abstract Tantalum-180m is a very rare primordial isotope and is not in its nuclear ground state. The radioactivity of Ta180m has not yet been observed. Previous attempts to measure the half-life of Ta180m 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 d in the 225 m deep underground laboratory HADES. The new lower bound for the half-life is 1.7×1016 y for electron capture decay and 1.2×1016 y for Beta- decay. This gives a total lower bound for the half-life of 7.1×1015 y, which is a factor of 6 higher than the previous lower bound.
Subject Nuclear Physics
Keyword(s) Naturally-Occurring Isotope
Gamma-Ray Spectrometry
DOI - identifier 10.1103/PhysRevC.74.054311
Copyright notice © 2006 The American Physical Society.
ISSN 0556-2813
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