New Limits on Naturally Occurring Electron Capture of 123Te

Details New Limits on Naturally Occurring Electron Capture of 123Te New Limits on Naturally Occurring Electron Capture of 123Te

2002-11-06

arxiv.org/abs/hep-ex/0211015v1

Phys.Rev. C67 (2003) 014323

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 3 figures, submitted to Physical Review C

Scientific paper

10.1103/PhysRevC.67.014323

Electron capture of 123Te from the K shell has been investigated in a new underground search with an array of 340 g TeO_2 thermal detectors. We find that some previous indication of this decay could be attributed to E.C. of 121Te resulting from neutron activation of natural Tellurium. There is therefore so far no evidence for E.C. of 123Te from the K shell with a 90 % c.l. lower limit t_{1/2}^K > 5.E19 years on the half lifetime. Taking into account the predicted K E.C. branching ratio, the corresponding lower limit on the 123Te EC half lifetime is t_{1/2} > 9.2E16 y, which can be theoretically interpreted only on the basis of a strong suppression of the nuclear matrix elements. A complementary analysis based on the expected fraction of E.C. accompanied by internal bremsstrahlung is discussed.

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