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Electron capture of 123Te from the K shell has been investigated in a newunderground search with an array of 340 g TeO_2 thermal detectors. We find thatsome previous indication of this decay could be attributed to E.C. of 121Teresulting from neutron activation of natural Tellurium. There is therefore sofar no evidence for E.C. of 123Te from the K shell with a 90 % c.l. lower limitt_{1/2}^K > 5.E19 years on the half lifetime. Taking into account the predictedK E.C. branching ratio, the corresponding lower limit on the 123Te EC halflifetime is t_{1/2} > 9.2E16 y, which can be theoretically interpreted only onthe basis of a strong suppression of the nuclear matrix elements. Acomplementary analysis based on the expected fraction of E.C. accompanied byinternal bremsstrahlung is discussed.Comment: 4 pages, 3 figures, submitted to Physical Review

physical review. c. nuclear physics/physical review. c, nuclear physics

New limits on naturally occurring electron capture of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>123</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Te</mml:mi></mml:math>

New limits on naturally occurring electron capture of123Te