Development of the ultra-low background HPGe spectrometer OBELIX at Modane underground laboratory

作者：Brudanin V B; Egorov V G; Hodak R; Klimenko A A; Loaiza P; Mamedov F; Piquemal F; Rukhadze E^*; Rukhadze N; Stekl I; Shitov Yu A; Warot G; Yakushev E A; Zampaolo M

来源：Journal of Instrumentation, 2017, 12(02): P02004.

DOI：10.1088/1748-0221/12/02/P02004

• Double-beta decay detectors
• Gamma detectors (scintillators, CZT, HPG, HgI etc)
• Spectrometers

A new ultra low-background spectrometer based on a HPGe detector with a sensitive volume of 600 cm(3) was developed to investigate rare nuclear processes, such as resonant neutrino-less double electron capture (OvEC/EC) and double beta decay processes (2 nu 2 beta(-), 2 nu beta+EC, 2 nu EC/EC) to the excited states of daughter nuclei. The spectrometer was installed at the Modane underground laboratory (LSM, France, 4800 m we.). Sensitivity of the spectrometer and its background were tested. A new method for the efficiency calibration in measurements of low-active samples was developed. The spectrometer was used for the measurements of low active materials and samples. Results obtained in 395 h investigation of resonant 0 nu EC/EC decay of 106Cd to the 2718 keV and 2741 keV excited states of Pd-106 with similar to 23.2 g of enriched Cd-106 and 2 nu 2 beta(-), decay of Mo-100 sample with a mass of 2588 g to the 0(+), 1130 keV and 2(+), 539.5 keV excited states of Ru-100 are presented.

• 出版日期2017-2