C. Saenz et al., RESULTS OF A SEARCH FOR DOUBLE POSITRON DECAY AND ELECTRON-POSITRON CONVERSION OF KR-78, Physical review. C. Nuclear physics, 50(2), 1994, pp. 1170-1174
The results of a search for the 2beta+ and Kbeta+ decay modes of Kr-78
, in a coincidence experiment using a high pressure ionization chamber
of enriched Kr-78 inside an array of sodium iodine scintillators, are
presented. After 4434 h of counting time, the half-life lower limits
obtained are T1/2(Kbeta+)0nu greater-than-or-equal-to 5.1 X 10(21) yr
and T1/2(2beta+)0nu+2mu greater-than-or-equal-to 2.0 X 10(21) yr at 68
% C.L.