R&D of a Fast-Responding VETO Counter for K0 Rare Decay Experiments Using Recycled and/or New Scintillating Materials

2024 Fiscal Year Final Research Report

• Project/Area Number: 22K03659
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
• Research Institution: Yamagata University
• Principal Investigator: Yoshida Hiroshi 山形大学, 学士課程基盤教育院, 教授 (80241727)
• Project Period (FY): 2022-04-01 – 2025-03-31
• Keywords: 粒子線検出器 / カロリメーター / シンチレーター

Outline of Final Research Achievements

We performed fundamental R&D to develop a fast-response gamma VETO counter for the next phase of the K0 rare decay experiment. We conducted experiments to evaluate the fluorescence lifetime and fiber attenuation length of newly developed wavelength shifter (WLS) scintillator materials, which exhibit excellent time response. We constructed a test counter by integrating high-speed WLS fibers into its light collection system. We then evaluated its response speed and time resolution through accelerator beam experiments and cosmic ray bench tests. These results represent a step forward in developing a cost-effective large sandwich calorimeter that can operate in higher counting rate environments with its fast response.

Free Research Field

素粒子原子核物理学

Academic Significance and Societal Importance of the Research Achievements

近年、素粒子原子核物理学実験の分野では、実験装置はいっそう大型化し、加速器ビームも大強度化しつつある。そういう状況下であらゆる検出器は応答速度の向上が求められており、本研究は学問分野全体に資するものとなっている。さらに使用材料については、リサイクル材料の活用、製造の環境負荷低減、低コスト化を常に意識しており、素核実験分野の未来における環境性、経済性、持続性などについて貢献できるものと考えている。