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The TRIUMF-ISAC gamma-ray escape-suppressed spectrometer (TIGRESS) is a new γ -ray detector array being developed for use at TRIUMF's Isotope Separator and Accelerator (ISAC) radioactive ion beam facility. TIGRESS will comprise 12 32-fold segmented clover-type HPGe detectors coupled with 20-fold segmented modular Compton suppression shields and custom digital signal processing electronics. This paper provides an overview of the TIGRESS project and progress in its development to date.

High-precision measurements of the half-life and β-branching ratios for the β − decay of 26 Na to 26 Mg have been measured in β-counting and γ -decay experiments, respectively. A 4π proportional counter and fast tape transport system were employed for the half-life measurement, whereas the γ rays emitted by the daughter nucleus 26 Mg were detected with the 8π γ-ray spectrometer, both located at TRIUMF's isotope separator and accelerator radioactive beam facility. The half-life of 26 Na was determined to be T 1/2 = 1.07128 ± 0.00013 ± 0.00021 s, where the first error is statistical and the second systematic. The logf t values derived from these experiments are compared with theoretical values from a full sd-shell model calculation.