Gaseous Xe scintillator as a new particle-identification detector for high-intensity heavy RI beams
ORAL · Invited
Abstract
RIKEN RIBF is one of the accelerator facilities which can provide high-intensity and heavy-ion unstable beams in the world. Because the unstable nuclei are produced by in-flight method in RIBF, particle identification should be performed event by event. However, beam intensity is limited by the radiation hardness and pile-up events of the particle-identification (PID) detectors. Especially, an ion chamber, which is a standard delta E detector in RIBF, is bottleneck due to the slow response. Therefore, we have been developing a gaseous Xe scintillator. The reason for using a gas detector is that it is good radiation hardness since a gas state is structureless. The scintillation process of Xe gas is about 100 ns which is much faster than the response of the IC (decay time : ~100ns vs ~mu{}s order). The averaged energy to emit one scintillation photon is about 20 eV. and the gas requires small energy to produce one scintillation photon (~20eV). Thus, the gaseous Xe scintillator is promising as a new standard beam-PID detector, especially as a delta{}E detector.
We have performed beam irradiation tests for the gaseous Xe scintillator several times until now. We have evaluated the performance by performing PID of cocktail beams. As a result, it was found that the Xe scintillator has a good energy resolution and makes it possible to separate atomic number Z of beams in a broad region of Z=20 to around Z=55. In addition, we found that it also has good timing and position resolutions.
In this presentation, we report the details of the test experiments and future prospects.
We have performed beam irradiation tests for the gaseous Xe scintillator several times until now. We have evaluated the performance by performing PID of cocktail beams. As a result, it was found that the Xe scintillator has a good energy resolution and makes it possible to separate atomic number Z of beams in a broad region of Z=20 to around Z=55. In addition, we found that it also has good timing and position resolutions.
In this presentation, we report the details of the test experiments and future prospects.
*This work is supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers 15H05451, the JSPS A3 Foresight Program, ‘‘Nuclear Physics in the 21st Century’’.Y. H. acknowledges the support ofRIKEN Junior Research Associate Program.
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Publication: Y. Hijikata, et al., NIM B 541 (2023) 333-335
Presenters
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Yuto Hijikata
- Kyoto Univ
- Graduate School of Science, Kyoto University
- Kyoto University
- RIKEN Nishina Center & Department of Physics, Kyoto University