Half-life determination of 77Kr using the reference source method

Samples of 77Kr were produced by (n, 2n) reaction with a DT accelerator, the decay of 77Kr has been tracked by the reference source method with three High-Purity Germanium (HPGe) detectors. Experimental data were recorded at regular time intervals during measurements covering more than 600 min. The determined half-life of 77Kr is 71.25 (42) min, which indicated that the most recent values reported in the 1970s and the value recommended by Evaluated Nuclear Structure Data File (ENSDF) may be biased. •Half-life of 77Kr has been measured with a time interval near 9 half-lives.•The determined half-life of 77Kr is 71.25 (42) min.•The result is discrepant from the ENSDF recommended value of 74.4 (6) min.•The result agree with the most precisely experimental value of 71.1 (5) min.