Conclusive measurements on neutrino oscillation and the quest for the origin of matter dominated universe

2014 Fiscal Year Final Research Report

• Project/Area Number: 23244058
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: HASEGAWA Takuya 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (40261549)
• Co-Investigator(Kenkyū-buntansha): NISHIKAWA Koichiro 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 名誉教授 (60198439)
• Co-Investigator(Renkei-kenkyūsha): KOBAYASHI Takashi 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (70291317) ; MARUYAMA Takasumi 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (80375401) ; ISHII Takanobu 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (90134650) ; NAKADAIRA Takeshi 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (30378575) ; SAKASHITA Ken 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 助教 (50435616) ; OGITSU Toru 大学共同利用機関法人高エネルギー加速器研究機構, 超伝導低温工学センター, 教授 (30185524) ; KIMURA Nobuhiro 大学共同利用機関法人高エネルギー加速器研究機構, 超伝導低温工学センター, 准教授 (10249899)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 液体アルゴン三次元飛跡検出装置 / 物質優勢宇宙創成の謎の解明 / レプトンのCP対称性の研究 / 陽子崩壊探索研究 / ニュートリノ質量階層性の研究

Outline of Final Research Achievements

The Liquid Ar TPC detector technology is indispensable to give an answer to the quest for the origin of matter dominated universe. With this JSPS grant in aid program, the prototype Liquid Ar TPC detector is constructed and evaluated of its performances. Based on this experience, it is concluded that this type of detector is equipped with the necessary functionality to be used as T2K near site detector. With the experimental configuration, such that the 20kt to 70kt of this type of detector is located at the distance of 2300km from the neutrino production target and at deep underground (more than 3000m water equivalent depth), it is concluded that its unprecedentedly excellent performance on neutrino mass hierarchy determination and investigation of lepton sector CP violation, is unrivaled by other similar projects. It is recognized that the deep underground site for the detector is important to reach ultimate experiment sensitivity on proton decay search.

Free Research Field

素粒子・高エネルギー物理学の実験的研究