1994 Fiscal Year Final Research Report Summary
Study of Undoped CsI or BaF_2 Calorimeter with wavelength shifter readout
| Project/Area Number |
05640364
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | National Laboratory for High Energy Physics |
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Principal Investigator |
KUNO Yoshitaka KEK,Physics, Associate Professor, 物理研究部, 助教授 (30170020)
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| Co-Investigator(Kenkyū-buntansha) |
NAKANO Takashi Osaka University, Physics, Research Associate, 理学部・物理, 助手 (80212091)
SHINKAWA Takao KEK,Physics, Research Associate, 物理研究部, 助手 (70171064)
IMAZATO Jun KEK,Physics, Professor, 物理研究部, 教授 (40107686)
INAGAKI Takao KEK,Physics, Associate Professor, 物理研究部, 助教授 (60044757)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Wavelength shifter / Undoped CsI / Undoped BaF_2 / Plastic scintillator / Average 20% readout efficiency / 2-m attenuation length / Pulse shape analysis of scintillating lights / Active wavelength shifter |
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| Research Abstract |
For the application of undoped CsI,we have tested 6 different kinds of wavelength-shifting materials to measure the readout efficiency and the attenuation length of lights. They are (a) Bicron BC408, (b) Bicron BC499-54, (c) Bicron BC499-55, (d) Bicron BC499-56, (e) Kurrary PMMA (acryl), and (f) Kurrary's SCSN81. We obtained an average 20% readout efficiency (for a short sample) and about 2-m attenuation length.
In particular we are interested in 100% active calorimeter, in which we have to separate the lights from the shifter's light and (wavelength-shifted) CsI lights. We have tried pulse-shape analysis and/or shifters with less plastic-scintillating flour. As a result, we found that the shifter with less fours (such as the sample (c)) we might be able to separate them.
For the application of undoped BaF_2, which attracts attention owing to its fast timing characteristic, the development of wavelength shifters is not easy because of its 220-nm UV lights. Finally we have obtained a sample of shifter from Bicron and we are going to test it.
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