Precise energy calibration with position monitoring for neutrinoless double beta decay search

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400291
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku University
• Principal Investigator: Mitsui Tadao 東北大学, ニュートリノ科学研究センター, 准教授 (20283864)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ニュートリノ / 二重ベータ崩壊

Outline of Final Research Achievements

In "KamLAND-Zen" experiment, searching for neutrinoless double beta decay (0νββ)　 using Xe-136, we performed precise energy calibration with monitoring the position of the radioactive sources. The relation between light yield and energy depends on the position of the vertexes, so the uncertainty of the position of the radioactive sources contributes to the uncertainty of the energy scale. By monitoring the source position precisely then, systematic uncertainty of the energy scale has been reduced. We developed monitoring camera which can work in the oil-based liquid scintillator, to accomplish this precise position monitoring. With using the results of this precise energy calibration, we achieved the improvement in the sensitivity of search for 0νββ.

Free Research Field

素粒子実験