2023 Fiscal Year Final Research Report
Development of a 3D total absorption calorimeter using energy spliting method
| Project/Area Number |
20K03988
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | カロリメータ / 微細分割 / 入射角度 / 角度分解能 / シンチレーションファイバー / 結晶 / MPPC |
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| Outline of Final Research Achievements |
In particle physics experiments, it is important but difficult to measure the incident direction of photons. This study purposes to devep a calorimeter with high resolution of incident angle of photon, keeping its high energy resolution. One way of this is to make a highly segmentied crystal calorimeter. However, the dead volumes of photon sensor to measure the scintilltion photons and the cost are too large. Therefore, we attemmpted to make virtually segmented crystal calorimeter using scinitillating fibers. A cirtain amout of scintillating fibers are skewered from the side of the stacked crystals. Directions of the fibers are lateral (X, Y) and which has a few layers in depth (z: primary perticle direction) , then the intersection of x and y fiers will be a position of an energy deposited. The study arrived at the establishing readout of scintilating fibers. Also the study confirmed that the scintillation photons keep the position information of a shower even in crystals.
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| Free Research Field |
素粒子物理学実験
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| Academic Significance and Societal Importance of the Research Achievements |
KOTO 実験では粒子（物質）と反粒子（反物質）の非対称性（現代の物理学でわかっていることは，粒子が作られるとほとんど同数の反粒子が作られるべきであるが，我々の宇宙にはほぼ粒子しか残っていない）の起源について研究している．そのため中性K中間子の崩壊過程を観測しているが，キーとなる崩壊過程は２光子が出るだけであり，光子は中性なのでその軌道を測ることが困難である．光子のエネルギーを測る装置の中で光子はシャワーを起こすが，このシャワーの発展を観測することにより，光子の入射軌道に遡ることができる．本研究が完成すれば，コストをおさえてその方法を高性能に改善することができる．
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