Basic studies on neutrino mass spectroscopy with atoms
| Project/Area Number |
15H02093
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Okayama University |
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Principal Investigator |
Sasao Noboru 岡山大学, 異分野基礎科学研究所, 特任教授 (10115850)
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| Co-Investigator(Kenkyū-buntansha) |
吉村 浩司 岡山大学, 異分野基礎科学研究所, 教授 (50272464)
吉村 太彦 岡山大学, 異分野基礎科学研究所, 教授 (70108447)
田中 実 大阪大学, 理学研究科, 助教 (70273729)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥42,510,000 (Direct Cost: ¥32,700,000、Indirect Cost: ¥9,810,000)
Fiscal Year 2017: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
Fiscal Year 2016: ¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000)
Fiscal Year 2015: ¥18,980,000 (Direct Cost: ¥14,600,000、Indirect Cost: ¥4,380,000)
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| Keywords | ニュートリノ / マクロコヒーランス / マクロコヒーレンス / ニュートリノ質量 / マヨラナニュートリノ / マクロコヒーラント増幅機構 / 二光子対超放射 |
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| Outline of Final Research Achievements |
The ultimate goal of the studies is to measure neutrinos’ important parameters yet to be determined. To this end, we focus on a process which emits neutrino pair and photon from excited states of atoms or molecules. Experimentally the most important point is to realize amplification of process rates due to quantum coherence. In this research, we studied experimentally this amplification mechanism using two photon coherent emissions from a vibrationally excited state of hydrogen molecules. As a result, we successfully observed coherently amplified two photon process in a counter-propagating excitation configuration in addition to usual Raman-type excitation configuration. The process rate was found to agree well with the expectation of the theory. Related theoretical studies were also performed: we proposed a method to remove background events, and found a way to improve sensitivity to determine neutrino parameters by imprinting an initial phase to a target system.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の最終目標は、ニュートリノの未確定で重要な性質(例えば質量絶対値やマヨラナ・ティラック型の識別)を確定することにある。このために原子(あるいは分子)からのニュートリノ対放射過程に注目し、その頻度を増幅するため量子干渉効果を用いる。本研究では、水素分子の振動励起状態からの二光子遷移を観測することにより量子干渉性増幅機構の詳細を研究した。また実際のニュートリノ対観測にむけて、背景事象の低減法や感度向上法などを理論的に研究した。この結果、原子を用いるという新しい方法によるニュートリノ研究の基礎を確立した。
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Report
(4 results)
Research Products
(60 results)
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[Journal Article] Simultaneous Measurements of Superradiance at Multiple Wavelength from Helium Excited States: II. Analysis.2016
Author(s)
Ohae, C., Harries, J.R., Iwayama, H., Kawaguchi, K., Kuma, S., Miyamoto, Y., Nagasono, M., Nakajima, K., Nakano, I., Shigemasa, E., Sasao, N., Uetake, S., Wakabayashi, T., Yoshimi, A., Yoshimura, K., Yoshimura, M
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Journal Title
J. Phys. Soc. Jpn.
Volume: 85
Issue: 3
Pages: 034301-034301
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Single-atom response of helium atoms to pulses from an EUV free-electron laser: Implications for the subsequent development of superfluorescence2016
Author(s)
James R. Harries, Chiaki Ohae, Susumu Kuma, Kyo Nakajima, Tadashi Togashi, Yuki Miyamoto, Noboru Sasao,Hiroshi Iwayama, Mitsuru Nagasono, Makina Yabashi, and Eiji Shigemasa
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Journal Title
PHYSICAL REVIEW A
Volume: 94
Issue: 6
Pages: 063416-063416
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] A streak camera study of superfluorescence at multiple wavelengths from helium atoms excited using free electron laser pulses2015
Author(s)
Harries, J.R., Iwayama, H., Nagasono, M., Togashi, T., Yabashi, M., Kuma, S., Nakajima, K., Miyamoto, Y., Ohae, C., Sasao, N., Shigemasa, E
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Journal Title
Journal of Physics B: Atomic, Molecular and Optical Physics
Volume: 48
Issue: 10
Pages: 105002-105002
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Rate amplification of the two photon emission from para-hydrogen toward the neutrino mass measurement2015
Author(s)
Takahiko Masuda, Hideaki Hara, Yuki Miyamoto, Susumu Kuma, Itsuo Nakano, Chiaki Ohae, Noboru Sasao, Minoru Tanaka, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura
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Journal Title
Hyperfine Interactions
Volume: 236
Issue: 1-3
Pages: 73-77
DOI
Related Report
Peer Reviewed
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[Presentation] コヒーランス生成2015
Author(s)
原秀明
Organizer
研究会「量子イオンビームの切り拓く物理」
Place of Presentation
高エネルギー加速器研究機構（茨城県つくば市)
Year and Date
2015-12-24
Related Report
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[Presentation] 低エネルギー実証実験2015
Author(s)
笹尾登
Organizer
研究会「量子イオンビームの切り拓く物理」
Place of Presentation
高エネルギー加速器研究機構（茨城県つくば市)
Year and Date
2015-12-24
Related Report
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[Presentation] A search for ultra-low energy nuclear isomer state of Thorium-229 using intense X-ray source2015
Author(s)
K.Yoshimura, H.Hara, T.Iwasaki, Y.Kobayashi, S.Kitao, K.Konashi, R.Masuda, T.Masuda, Y.Miyamoto, I.Nakano, N.Sasao, M.Seto, S.Stellmer, S.Uetake, A.Yamaguchi, Y.Yoda, A.Yoshimi, M.Yoshimura, M.Watanabe
Organizer
The 22th International Conference on Laser Spectroscopy(ICOLS)
Place of Presentation
Sentosa Island, Singapore
Year and Date
2015-06-30
Related Report
Int'l Joint Research
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