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Crystal Growth and Scintillation Properties of <tex> ${\hbox {Rb}}_{2} {\hbox {CeBr}} _{5}$</tex>
Sunghwan Kim,Joon Il Lee,Sih-Hong Doh,Hong Joo Kim,Hwanbae Park,Heedong Kang,Dosung Kim,Hong U IEEE 2009 IEEE transactions on nuclear science Vol.56 No.3
<P>In this paper, crystal growth and scintillation properties of Rb2CeBr5 crystal are presented. The crystal was grown with the Bridgman method using a two zone transparent furnace. The investigation of scintillation properties of the crystal were performed under the excitation by X-ray and gamma;-ray at room temperature. The emission spectrum of the Rb2CeBr5 was observed in the range of 360 similar to 440 mn, peaking at 390.5 run, which is due to the 5d -> 4f transitions of the Ce3+. The decay time of the Ce3+ emission was composed two components. The fast component was 56.1 ns (98.8%), and the slow component was 329.9 ns (1.2%). The energy resolution of the crystal was obtained to be 6.9% for the Cs-137 662 keV gamma-ray. The absolute light yield of the Rb2CeBr5 crystal is about 34,000 phs/MeV, and the non-proportionality of the crystal was also measured.</P>
The CREAM Experiment in the International Space Station
이직,전진아,이현수,이혜영,임희진,박일흥,김홍주,박한배,이무현,서은석,Lee, Jik,Jeon, Jina,Lee, Hyun Su,Lee, Hye Young,Lim, Heuijin,Park, Il Hung,Roh, Youn,Kim, Hongjoo,Park, Hwanbae,Lee, Moo Hyun,Seo, Eun-Suk 한국천문학회 2012 天文學會報 Vol.37 No.2
The NASA Antarctica balloon experiment CREAM has successfully collected the data of energetic cosmic rays during six flights in past years. It recently observed the unexpected discrete hardening in energy spectra of comic rays. However high-statistics data of energetic cosmic rays are required for the further investigation of the unexpected hardening in comic-ray energy spectra. The International Space Station (ISS) is an ideal platform for the CREAM experiment to investigate the unexpected hardening and explore the fundamental issues like the acceleration mechanism and the origin of energetic cosmic rays because of the high duty cycle of the experiment in the ISS platform. We will present the design of the ISS-CREAM experiment, and the development and fabrication status of the detector components including the 4-layer silicon charge detector which will measure the charge constitution of cosmic rays with unprecedented accuracy.