Detection of neutrino pairs using macro coherent amplification mechanism

2014 Fiscal Year Final Research Report

• Project Area: Extreme quantum world opened up by atoms -towards establishing comprehensive picture of the universe based on particle physics-
• Project/Area Number: 21104002
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Okayama University
• Principal Investigator: SASAO NOBORU 岡山大学, その他部局等, 特任教授 (10115850)
• Co-Investigator(Kenkyū-buntansha): NAKANO Itsuo 岡山大学, 大学院自然科学研究科, 教授 (90133024) ; YOSHIMURA Motohiko 岡山大学, 理学部, 特任教授 (70108447) ; FUKUMI Atsushi 川崎医療短期大学, 放射線技術科, 講師 (40426656) ; WAKABAYASHI Tomonari 近畿大学, 理工学部, 教授 (30273428) ; TANAKA Minoru 大阪大学, 大学院理学研究科, 助教 (70273729) ; KATSURAGAWA Masayuki 電気通信大学, 大学院情報理工学研究科, 教授 (10251711)
• Co-Investigator(Renkei-kenkyūsha): NANJO Hajime 京都大学, 大学院理学研究科, 助教 (40419445) ; KAWAGUCHI Kentarou 岡山大学, 大学院自然科学研究科, 教授 (40158861) ; TANG Jian 岡山大学, 大学院自然科学研究科, 准教授 (40379706) ; KUBOZONO Yoshihiro 岡山大学, 大学院自然科学研究科, 教授 (80221935) ; TANIGAKI Katsumi 東北大学, 大学院理学研究科, 教授 (60305612) ; NAKAJIMA Kyo 岡山大学, 極限量子研究コア, 助教 (80400240) ; YOSHIMURA Koji 岡山大学, 極限量子研究コア, 教授 (50272464) ; YOSHIMI Akihiro 岡山大学, 極限量子研究コア, 准教授 (40333314) ; UETAKE Satoshi 岡山大学, 大学院自然科学研究科, 准教授 (80514778) ; KUMA Susumu 岡山大学, 極限量子研究コア, 助教 (50600045) ; TANIGUCHI Takashi 岡山大学, 極限量子研究コア, 准教授 (60163630)
• Project Period (FY): 2009-04-01 – 2015-03-31
• Keywords: ニュートリノ質量 / マヨラナ粒子 / マクロコヒーランス / 超放射

Outline of Final Research Achievements

"Macro-coherent amplification mechanism" is the crucial principle for success of the neutrino mass spectroscopy with atoms. The most important result of the present research was an experimental proof of the principle with a two photon process from the vibrationally excited state of para-hydrogen molecules. Actually, the initial coherent states were prepared by an adiabatic Raman process, and two photon emissions were observed. As a result, a gigantic enhancement factor of the photon yields greater than 15 orders of magnitude was confirmed compared to its natural emission rate; it was found consistent with the theoretical prediction. Thus a big step has been made forward towards the neutrino mass spectroscopy with atoms. In addition, detailed studies on super-radiance and phase relaxation etc. were conducted as basic studies using various atoms and molecules.

Free Research Field

高エネルギー物理学