Completion of multiple prompt -ray apparatus

Oshima, Masumi; Toh, Yosuke   ; Furutaka, Kazuyoshi  ; Murakami, Yukihiro*; Kimura, Atsushi   ; Koizumi, Mitsuo 

To achieve the new trace element analysis method of Multiple Prompt -ray Analysis (MPGA) we have completed the construction of the MPGA apparatus, STELLA, at C2-3-2 beam line at the neutron guide hall in JAEA Research Reactor, JRR-3. The MPGA system made of twelve Ge detectors has been completed. A fast data acquisition system for this system has been developed. An automatic liquid nitrogen supply system for Ge detectors and an automatic sample changer enable the automatic measurement. Furthermore, rapid -ray energy calibration and on-line quantification software is developed as well as necessary -ray database for them. In July 2008, we have started the application of STELLA to MPGA based on the Interorganization Atomic Energy Research program by University of Tokyo, Toray Research Center and JAEA. In the talk we present the performance and status of STELLA as well as those of the apparatus at the new facility of J-PARC MLF.