TY - JOUR
T1 - Recent progress of SPAN towards neutrino mass spectroscopy
AU - Masuda, T.
AU - Hara, H.
AU - Miyamoto, Y.
AU - Sasao, N.
AU - Tanaka, M.
AU - Uetake, S.
AU - Yoshimi, A.
AU - Yoshimura, K.
AU - Yoshimura, M.
N1 - Funding Information:
The author thanks the organizers of the TAUP2015 international conference for providing the opportunity for presenting our experiment. This work financially supported by MEXT and JSPS KAKENHI Grant Numbers 21104002, 25400257, and 26887026.
PY - 2016/6/9
Y1 - 2016/6/9
N2 - SPAN (Spectroscopy of Atomic Neutrino) project aims to determine the absolute neutrino mass. The process we plan to use is a cooperative de-excitation of atoms in a metastable level emitting a neutrino pair associated with a photon. The photon energy spectrum of this process contains information on the absolute mass of neutrino. Key items of this experiment are a rate amplification using macro-coherence in a target medium in case of plural particles emission and an external triggering of the emission in order to scan the spectrum. We have demonstrated the rate amplification in two-photon emission from para-hydrogen gas which was coherently excited to its first vibrationally excited state. The coherence in the medium was generated by irradiating two driving laser pulses. The emission was stimulated by irradiating a mid-infrared laser pulse. The enhancement factor of more than 1018 with respect to the spontaneous emission was achieved. This paper briefly summarizes the results.
AB - SPAN (Spectroscopy of Atomic Neutrino) project aims to determine the absolute neutrino mass. The process we plan to use is a cooperative de-excitation of atoms in a metastable level emitting a neutrino pair associated with a photon. The photon energy spectrum of this process contains information on the absolute mass of neutrino. Key items of this experiment are a rate amplification using macro-coherence in a target medium in case of plural particles emission and an external triggering of the emission in order to scan the spectrum. We have demonstrated the rate amplification in two-photon emission from para-hydrogen gas which was coherently excited to its first vibrationally excited state. The coherence in the medium was generated by irradiating two driving laser pulses. The emission was stimulated by irradiating a mid-infrared laser pulse. The enhancement factor of more than 1018 with respect to the spontaneous emission was achieved. This paper briefly summarizes the results.
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U2 - 10.1088/1742-6596/718/6/062043
DO - 10.1088/1742-6596/718/6/062043
M3 - Conference article
AN - SCOPUS:84981322891
SN - 1742-6588
VL - 718
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 6
M1 - 062043
T2 - 14th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2015
Y2 - 7 September 2015 through 11 September 2015
ER -