Quasi-nondestructive time-of-flight detector for efficient superheavy element search

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03600
• 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: Tokyo Institute of Technology (2022-2023); Kyushu University (2021)
• Principal Investigator: Nagae Daisuke 東京工業大学, 科学技術創成研究院, 特任准教授 (60455285)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 飛行時間検出器

Outline of Final Research Achievements

The purpose of this study is to develop a quasi-nondestructive time-of-flight detector using thin films and microchannel plates that can achieve high time resolution and high detection efficiency not only for low-energy heavy particles but also for low-energy light particles. Using this detector, high efficiency of superheavy element search will be achieved.
Performance evaluation tests of the prototype were conducted at the Kyushu University Tandem Accelerator Facility. The obtained time resolution was not sufficient, the detection efficiency was acceptable. In both cases, dependencs on the beam injection position were observed. Simulations were performed to improve the time resolution as well as the positional dependence. Based on the simulation results, a new detector was completed.

Free Research Field

原子核実験

Academic Significance and Societal Importance of the Research Achievements

新たに開発した準非破壊型飛行時間検出器では、低エネルギーの軽粒子でも高効率・高分解能で飛行時間を測定できる見込みである。これを用いれば超重元素探索実験において、これまで難しかった超重元素生成時の核融合反応の際に放出された軽粒子と生成された超重元素の崩壊に伴う軽粒子との識別が可能となる。その結果、高効率な超重元素探索が実現し、119番以降の元素の発見に大きな寄与が期待できる。