Updated on 2024/01/05

写真a

 
HARA Hideaki
 
Organization
Research Institute for Interdisciplinary Science Assistant Professor
Position
Assistant Professor
External link

Degree

  • 博士(理学) ( 京都大学 )

Research Areas

  • Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

  • Natural Science / Semiconductors, optical properties of condensed matter and atomic physics

Research History

  • Okayama University   The Research Institute for Interdisciplinary Science

    2016.4

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  • Okayama University   Research Core for Extreme Quantum World

    2014.4 - 2016.3

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  • Kyoto University   Graduate School of Science

    2014.2 - 2014.3

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  • Japan Society for Promotion of Science

    2011.4 - 2013.3

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Professional Memberships

 

Papers

  • Periodic superradiance in an Er:YSO crystal Reviewed

    Hideaki Hara, Junseok Han, Yasutaka Imai, Noboru Sasao, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura, Yuki Miyamoto

    Physical Review Research   2024.1

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevResearch.6.013005

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  • Parity violating magnetization at neutrino pair emission using trivalent lanthanoid ions Reviewed

    Hideaki Hara, Akihiro Yoshimi, Motohiko Yoshimura

    Physical Review D   104 ( 11 )   2021.12

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevd.104.115006

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.104.115006/fulltext

  • Simulation Study of Laser Ionization of Muonium by 1S-2S Excitation for the Muon g − 2/EDM Experiment at J-PARC

    Ce Zhang, Hideaki Hara, Takahiro Hiraki, Yutaka Ikedo, Yasutaka Imai, Katsuhiko Ishida, Saeid Kamal, Naritoshi Kawamura, Akihiro Koda, Yajun Mao, Takahiko Masuda, Tsutomu Mibe, Yasuhiro Miyake, Yuki Miyamoto, Yu Oishi, Masashi Otani, Patrick Strasser, Koichiro Shimomura, Kazuhito Suzuki, Satoshi Uetake, Takayuki Yamazaki, Shinsuke Yamamoto, Koji Yoshimura, Mitsuhiro Yoshida

    Proceedings of the 3rd J-PARC Symposium (J-PARC2019)   2021.3

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    Publishing type:Research paper (international conference proceedings)   Publisher:Journal of the Physical Society of Japan  

    DOI: 10.7566/jpscp.33.011125

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  • Geometry-dependent spectra and coherent-transient measurement of nearly degenerate four-wave mixing using two-photon resonance Reviewed

    Hideaki Hara, Yuki Miyamoto, Takahiro Hiraki, Kei Imamura, Takahiko Masuda, Noboru Sasao, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

    Journal of Physics B: Atomic, Molecular and Optical Physics   52 ( 23 )   235402   2019.12

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    Publishing type:Research paper (scientific journal)   Publisher:{IOP} Publishing  

    DOI: 10.1088/1361-6455/ab4a6e

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  • Neutrino mass spectroscopy using Er3+ ions placed at inversion center of host crystals

    H. Hara, N. Sasao, A. Yoshimi, M. Yoshimura

    arXiv:1910.14318v1   2019.10

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  • X-ray pumping of the 229Th nuclear clock isomer Reviewed

    Takahiko Masuda, Akihiro Yoshimi, Akira Fujieda, Hiroyuki Fujimoto, Hiromitsu Haba, Hideaki Hara, Takahiro Hiraki, Hiroyuki Kaino, Yoshitaka Kasamatsu, Shinji Kitao, Kenji Konashi, Yuki Miyamoto, Koichi Okai, Sho Okubo, Noboru Sasao, Makoto Seto, Thorsten Schumm, Yudai Shigekawa, Kenta Suzuki, Simon Stellmer, Kenji Tamasaku, Satoshi Uetake, Makoto Watanabe, Tsukasa Watanabe, Yuki Yasuda, Atsushi Yamaguchi, Yoshitaka Yoda, Takuya Yokokita, Motohiko Yoshimura, Koji Yoshimura

    Nature   573 ( 7773 )   238 - 242   2019.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1038/s41586-019-1542-3

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  • Raman stimulated neutrino pair emission Reviewed

    Hideaki Hara, Motohiko Yoshimura

    The European Physical Journal C   79 ( 8 )   2019.8

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    DOI: 10.1140/epjc/s10052-019-7148-y

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  • Coherent two-photon emission from hydrogen molecules excited by counter-propagating laser pulses Reviewed

    Takahiro Hiraki, Hideaki Hara, Yuki Miyamoto, Kei Imamura, Takahiko Masuda, Noboru Sasao, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

    Journal of Physics B: Atomic, Molecular and Optical Physics   52 ( 4 )   045401 - 045401   2019.2

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    Publishing type:Research paper (scientific journal)   Publisher:{IOP} Publishing  

    DOI: 10.1088/1361-6455/aafbd0

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  • Nuclear resonant scattering experiment with fast time response: Photonuclear excitation of Hg 201 Reviewed

    A. Yoshimi, H. Hara, T. Hiraki, Y. Kasamatsu, S. Kitao, Y. Kobayashi, K. Konashi, R. Masuda, T. Masuda, Y. Miyamoto, K. Okai, S. Okubo, R. Ozaki, N. Sasao, O. Sato, M. Seto, T. Schumm, Y. Shigekawa, S. Stellmer, K. Suzuki, S. Uetake, M. Watanabe, A. Yamaguchi, Y. Yasuda, Y. Yoda, K. Yoshimura, M. Yoshimura

    Physical Review C   97 ( 2 )   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society  

    Nuclear resonant excitation and detection of its decay signal for the 26.27-keV level of Hg201 is demonstrated with high-brilliance synchrotron radiation (SR) and a fast x-ray detector system. This SR-based photonuclear excitation scheme, known as nuclear resonant scattering (NRS) in the field of materials science, is also useful for investigating nuclear properties, such as the half-lives and radiative widths of excited nuclear levels. To date, because of the limited time response of the x-ray detector, the nuclear levels to which this method could be applied have been limited to the one whose half-lives are longer than ∼1 ns. The faster time response of the NRS measurement makes possible NRS experiments on nuclear levels with much shorter half-lives. We have fabricated an x-ray detector system that has a time resolution of 56 ps and a shorter tail function than that reported previously. With the implemented detector system, the NRS signal of the 26.27-keV state of Hg201 could be clearly discriminated from the electronic scattering signal at an elapsed time of 1 ns after the SR pulse. The half-life of the state was determined as 629 ± 18 ps, which has better precision by a factor of three compared with that reported to date obtained from nuclear decay spectroscopy.

    DOI: 10.1103/PhysRevC.97.024607

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  • Vibrational excitation of hydrogen molecules by two-photon absorption and third-harmonic generation Reviewed

    Yuki Miyamoto, Hideaki Hara, Takahiro Hiraki, Takahiko Masuda, Noboru Sasao, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   51 ( 1 )   2018.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    We report the coherent excitation of the vibrational state of hydrogen molecules by two-photon absorption and the resultant third-harmonic generation (THG). Parahydrogen molecules cooled by liquid nitrogen are irradiated by mid-infrared nanosecond pulses at 4.8 mu m with a nearly Fourier-transform-limited linewidth. The first excited vibrational state of parahydrogen is populated by two-photon absorption of the mid-infrared photons. Because of the narrow linewidth of the mid-infrared pulses, coherence between the ground and excited states is sufficient to induce higher-order processes. Near-infrared photons from the THG are observed at 1.6 mu m. The dependence of the intensity of the near-infrared radiation on mid-infrared pulse energy, target pressure, and cell length is determined. We used a simple formula for THG with consideration of realistic experimental conditions to explain the observed results.

    DOI: 10.1088/1361-6455/aa9782

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  • Frequency dependence of coherently amplified two-photon emission from hydrogen molecules Reviewed

    Hideaki Hara, Yuki Miyamoto, Takahiro Hiraki, Takahiko Masuda, Noboru Sasao, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

    PHYSICAL REVIEW A   96 ( 6 )   2017.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    We investigate how the efficiency of coherently amplified two-photon emission depends on the frequency of one of the two emitted photons, namely the signal photon. This is done over the wavelength range of 5.048-10.21 mu m by using the vibrational transition of parahydrogen. The efficiency increases with the frequency of the signal photon. Considering experimental errors, our results are consistent with the theoretical prediction for the present experimental conditions. This study is an experimental demonstration of the frequency dependence of coherently amplified two-photon emission, and also presents its potential as a light source.

    DOI: 10.1103/PhysRevA.96.063827

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  • Fast x-ray detector system with simultaneous measurement of timing and energy for a single photon Reviewed

    T. Masuda, S. Okubo, H. Hara, T. Hiraki, S. Kitao, Y. Miyamoto, K. Okai, R. Ozaki, N. Sasao, M. Seto, S. Uetake, A. Yamaguchi, Y. Yoda, A. Yoshimi, K. Yoshimura

    REVIEW OF SCIENTIFIC INSTRUMENTS   88 ( 6 )   2017.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    We developed a fast X-ray detector system for nuclear resonant scattering (NRS) experiments. Our system employs silicon avalanche photo-diode (Si-APD) as a fast X-ray sensor. The system is able to acquire both timing and energy of a single X-ray photon simultaneously in a high rate condition, 106 counts per second for one Si-APD. The performance of the system was investigated in SPring-8, a synchrotron radiation facility in Japan. Good time resolution of 120 ps (FWHM) was achieved with a slight tail distribution in the time spectrum by a level of 10(-9) at 1 ns apart from the peak. Using this system, we successfully observed the NRS from the 26.27-keV level of mercury-201, which has a half-life of 630(50) ps. We also demonstrated the reduction of background events caused by radioactive decays in a radioactive sample by discriminating photon energy. Published by AIP Publishing.

    DOI: 10.1063/1.4989405

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  • Vibrational Two-Photon Emission from Coherently Excited Solid Parahydrogen Reviewed

    Yuki Miyamoto, Hideaki Hara, Takahiko Masuda, Noboru Sasao, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

    JOURNAL OF PHYSICAL CHEMISTRY A   121 ( 20 )   3943 - 3951   2017.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    We report the observation of two-photon emission from a coherently excited vibrational state of solid parahydrogen, which is also a known quantum solid. Coherence between the ground and the excited states is prepared by stimulated Raman scattering using two visible laser pulses. The two-photon emission is triggered by another mid-infrared laser pulse. It was observed that the two-photon emission persists even when the trigger pulse is injected long after the excitation. This is due to the long decoherence time of the vibrational states of solid parahydrogen. It is found that the emission intensity increases even after the excitation pulses pass through the target completely. This coherence development is highly suppressed at high target temperatures and high residual orthohydrogen concentrations. Effects of target annealing and laser-induced damage on the target are also observed.

    DOI: 10.1021/acs.jpca.7b02011

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  • Injection-seeded tunable mid-infrared pulses generated by difference frequency mixing Reviewed

    Yuki Miyamoto, Hideaki Hara, Takahiko Masuda, Takahiro Hiraki, Noboru Sasao, Satoshi Uetake

    JAPANESE JOURNAL OF APPLIED PHYSICS   56 ( 3 )   2017.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    We report on the generation of nanosecond mid-infrared pulses having frequency tunability, a narrow linewidth, and a high pulse energy. These pulses are obtained by frequency mixing between injection-seeded near-infrared pulses in potassium titanyl arsenate crystals. A continuous-wave external cavity laser diode or a Ti:sapphire ring laser is used as a tunable seeding source for the near-infrared pulses. The typical energy of the generated mid-infrared pulses is in the range of 0.4-1mJ/pulse. The tuning wavelength ranges from 3142 to 4806 nm. A narrow linewidth of 1.4GHz and good frequency reproducibility of the mid-infrared pulses are confirmed by observing a rovibrational absorption line of gaseous carbon monoxide at 4587 nm. (C) 2017 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.56.032101

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  • Recent progress of SPAN towards neutrino mass spectroscopy Reviewed

    Masuda T, Hara H, Miyamoto Y, Sasao N, Tanaka M, Uetake S, Yoshimi A, Yoshimura K, Yoshimura M

    Journal of Physics: Conference Series   718 ( 6 )   2016

  • Rate amplification of the two photon emission from para-hydrogen toward the neutrino mass measurement Reviewed

    Takahiko Masuda, Hideaki Hara, Yuki Miyamoto, Susumu Kuma, Itsuo Nakano, Chiaki Ohae, Noboru Sasao, Minoru Tanaka, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

    HYPERFINE INTERACTIONS   236 ( 1-3 )   73 - 77   2015.11

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:SPRINGER  

    We recently reported an experiment which focused on demonstrating the macro-coherent amplification mechanism. This mechanism, which was proposed for neutrino mass measurements, indicates that a multi-particle emission rate should be amplified by coherence in a suitable medium. Using a para-hydrogen molecule gas target and the adiabatic Raman excitation method, we observed that the two photon emission rate was amplified by a factor of more than 10(15) from the spontaneous emission rate. This paper briefly summarizes the previous experimental result and presents the current status and the future prospect.

    DOI: 10.1007/s10751-015-1177-1

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  • Externally triggered coherent two-photon emission from hydrogen molecules Reviewed

    Yuki Miyamoto, Hideaki Hara, Takahiko Masuda, Noboru Sasao, Minoru Tanaka, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   2015 ( 8 )   2015.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:OXFORD UNIV PRESS INC  

    We report on coherent enhancement of two-photon emission from the excited vibrational state of molecular hydrogen triggered by irradiating mid-infrared pulses externally. We previously observed the two-photon emission triggered by the internally generated fourth Stokes photons. By injecting independent mid-infrared pulses externally, it is possible to control the experimental parameters and investigate the mechanism in more detail. In this article, we describe the two-photon emission using the external trigger pulses. Its spectrum and dependence on the energy and timing of the trigger pulse are presented along with numerical simulations based on the Maxwell-Bloch equations. The measured number of emitted photons is 6 x 10(11) photons/pulse and the resulting enhancement factor from the spontaneous emission is more than 10(18). This value is three orders of magnitude higher than that of the previous experiment. External control of the emission process is expected to be essential for observation of the weaker process of radiative emission of a neutrino pair.

    DOI: 10.1093/ptep/ptv103

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  • Observation of coherent two-photon emission from the first vibrationally excited state of hydrogen molecules Reviewed

    Yuki Miyamoto, Hideaki Hara, Susumu Kuma, Takahiko Masuda, Itsuo Nakano, Chiaki Ohae, Noboru Sasao, Minoru Tanaka, Satoshi Uetake, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   2014 ( 11 )   2014.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:OXFORD UNIV PRESS INC  

    In this paper, we describe an experiment which was conducted to explore the macro-coherent amplification mechanism using a two-photon emission process from the first vibrationally excited state of the para-hydrogen molecule. Large coherence in the initial state was prepared by the adiabatic Raman method, and the lowest Stokes sideband was used as a trigger field. We observed coherent two-photon emission consistent with the expectation of the Maxwell-Bloch equation derived for the process, whose rate is larger by many orders of magnitude than that of spontaneous emission.

    DOI: 10.1093/ptep/ptu152

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  • A Three-Dimensional Optical Lattice of Ytterbium and Lithium Atomic Gas Mixture Reviewed

    Hideaki Hara, Hideki Konishi, Shuta Nakajima, Yosuke Takasu, Yoshiro Takahashi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 1 )   2014.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    We develop an optical lattice system for an ultracold atomic gas mixture of ytterbium (Yb-174) and lithium (Li-6), which is an ideal system for studying disorder and impurity problems. We load a Bose-Einstein condensate of Yb-174 into a three-dimensional optical lattice and observe its interference patterns in time-of-flight (TOF) images. Furthermore, we perform laser spectroscopy of Yb-174 in an optical lattice using the ultranarrow optical transition S-1(0)-P-3(2) in both cases with and without Li-6. Owing to the weak interspecies interaction, we do not observe clear effects of Li-6 in the obtained interference patterns or excitation spectra. However, this is an important first step in the optical control of atomic impurity in ultracold fermions. We also measure the polarizabilities of the P-3(2) state of Yb-174 atoms in an optical trap with a wavelength of 1070 nm. We reveal that the polarizability can be tuned to be positive, zero, or the same as the ground state, which is useful for certain applications.

    DOI: 10.7566/JPSJ.83.014003

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  • Photoassociative production of ultracold heteronuclear ytterbium molecules Reviewed

    Mateusz Borkowski, Roman Ciurylo, Paul S. Julienne, Rekishu Yamazaki, Hideaki Hara, Katsunari Enomoto, Shintaro Taie, Seiji Sugawa, Yosuke Takasu, Yoshiro Takahashi

    PHYSICAL REVIEW A   84 ( 3 )   2011.9

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    We report observations of photoassociation (PA) spectra near the intercombination line in isotopic mixtures of ultracold ytterbium gases. Several heteronuclear bound states have been found for the excited (170)Yb(174)Yb and (174)Yb(176)Yb molecules. We develop a single-channel mass-scaled interaction model for the excited state molecule which well reproduces the measured bound state energies. This is an important step toward optical control of interactions in mixtures of ultracold ytterbium gases using heteronuclear optical Feshbach resonances. The model developed is applicable in collisions of other similar systems, such as cadmium and mercury.

    DOI: 10.1103/PhysRevA.84.030702

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  • Quantum Degenerate Mixtures of Alkali and Alkaline-Earth-Like Atoms Reviewed

    Hideaki Hara, Yosuke Takasu, Yoshifumi Yamaoka, John M. Doyle, Yoshiro Takahashi

    PHYSICAL REVIEW LETTERS   106 ( 20 )   2011.5

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    We realize simultaneous quantum degeneracy in mixtures consisting of the alkali and alkaline earth like atoms Li and Yb. This is accomplished within an optical trap by sympathetic cooling of the fermionic isotope Li-6 with evaporatively cooled bosonic Yb-174 and, separately, fermionic Yb-173. Using cross-thermalization studies, we also measure the elastic s-wave scattering lengths of both Li-Yb combinations, vertical bar a(6Li-174Yb)vertical bar = 1.0 +/- 0.2 nmand vertical bar a(6Li-173Yb)vertical bar = 0.9 +/- 0.2 nm. The equality of these lengths is found to be consistent with massscaling analysis. The quantum degenerate mixtures of Li and Yb, as realized here, can be the basis for creation of ultracold molecules with electron spin degrees of freedom, studies of novel Efimov trimers, and impurity probes of superfluid systems.

    DOI: 10.1103/PhysRevLett.106.205304

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  • Simultaneous magneto-optical trapping of lithium and ytterbium atoms towards production of ultracold polar molecules Reviewed

    M. Okano, H. Hara, M. Muramatsu, K. Doi, S. Uetake, Y. Takasu, Y. Takahashi

    APPLIED PHYSICS B-LASERS AND OPTICS   98 ( 4 )   691 - 696   2010.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    We have successfully implemented the first simultaneous magneto-optical trapping (MOT) of lithium ((6)Li) and ytterbium ((174)Yb) atoms towards production of ultracold polar molecules of LiYb. For this purpose, we developed the dual atomic oven which contains both atomic species as an atom source and successfully observed the spectra of the Li and Yb atoms in the atomic beams from the dual atomic oven. We constructed the vacuum chamber including the glass cell with the windows made of zinc selenium (ZnSe) for the CO(2) lasers, which are the useful light sources of optical trapping for evaporative and sympathetic cooling. Typical atom numbers and temperatures in the compressed MOT are 7x10(3) atoms, 640 mu K for (6)Li, 7x10(4) atoms, and 60 mu K for (174)Yb, respectively.

    DOI: 10.1007/s00340-009-3728-0

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MISC

  • Search for vacuum-ultraviolet photon by de-excitation from the isomeric state of thorium 229

    岡井晃一, BEEKS Kjeld, 藤本弘之, 福永優太, GUAN M., 羽場宏光, 原秀明, 平木貴宏, 稲垣新, 小早川大貴, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 笹尾登, SCHUMM Thorsten, 瀬戸誠, 重河優大, 高取沙悠理, 玉作賢治, 植竹智, 渡部司, 渡部信, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

    日本物理学会講演概要集(CD-ROM)   77 ( 2 )   2022

  • Development of the ionization laser for J-PARC muon g-2 experiment

    上岡修星, 吉田光宏, 三部勉, ZHANG Ce, 原秀明, 平木貴宏, 今井康貴, 増田孝彦, 宮本祐樹, 植竹智, 山基真佑, 吉村浩司, 鈴木一仁, 石田勝彦

    日本物理学会講演概要集(CD-ROM)   76 ( 2 )   2021

  • Experimental status of searching for vacuum ultraviolet light from the 229Th isomeric state

    平木貴宏, BEEKS Kjeld, 藤枝亮, 羽場宏光, 原秀明, 海野弘之, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 岡井晃一, 笹尾登, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 玉作賢治, 植竹智, 渡部信, 渡部司, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020

  • Search for VUV signal from isomer level of Th-229

    海野弘行, 羽場宏光, 原秀明, 平木貴宏, 藤枝亮, 藤本弘之, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 岡井晃一, 笹尾登, BEEKS Kjeld, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 玉作賢治, 植竹智, 渡部信, 渡部司, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020

  • トリウム229の原子核時計遷移分光

    鈴木健太, 羽場宏光, 原秀明, 平木貴宏, 藤枝亮, 藤本弘之, 海野弘行, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 岡井晃一, 笹尾登, 佐藤帯子, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 玉作賢治, 植竹智, 渡部信, 渡部司, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019

  • 核共鳴散乱を用いたトリウム229アイソマー準位への人工的遷移

    海野弘行, 羽場宏光, 原秀明, 平木貴宏, 藤枝亮, 藤本弘之, 鈴木健太, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 岡井晃一, 笹尾登, 佐藤帯子, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 玉作賢治, 植竹智, 渡部信, 渡部司, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019

  • トリウム229の極低エネルギー原子核時計遷移の探索 II

    植竹智, 原秀明, 平木貴宏, 海野弘行, 笠松良崇, 北尾真司, 小無健司, 増田孝彦, 宮本祐樹, 岡井晃一, 笹尾登, 佐藤帯子, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 鈴木健太, 渡部信, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   ROMBUNNO.12aB102‐14   2018.9

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  • Development of Ba ion source for QIB

    Fujieda A, Imamura K, Kamigaito O, Nakagawa T, Kanai Y, Ichikawa Y, Nagatomo T, Honda Y, Sakaue S, Sasao N, Yoshimura M, Yoshimura K, Yoshimi A, Uetake S, Miyamoto Y, Masuda T, Hara H

    Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   538 - 538   2018

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  • トリウム229の極低エネルギー原子核時計遷移の探索

    植竹智, 植竹智, 原秀明, 平木貴宏, 岩崎達郎, 笠松良崇, 北尾真司, 小林康浩, 小無健司, 増田孝彦, 増田亮, 宮本祐樹, 岡井晃一, 大久保翔, 尾崎亮太, 笹尾登, 佐藤帯子, SCHUMM Thorsten, 瀬戸誠, 重河優大, STELLMER Simon, 鈴木健太, 渡部信, 山口敦史, 安田勇輝, 依田芳卓, 吉見彰洋, 吉村浩司, 吉村太彦

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   Rombun NO.20pH31‐2   2017.3

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  • 相対論的量子イオンビームによる高強度ガンマ線源

    本田洋介, 笹尾登, 吉村太彦, 吉村浩二, 吉見彰洋, 植竹智, 増田孝彦, 宮本祐樹, 原秀明, 平木貴宏, 横谷馨, 吉田光宏, 上垣外修一, 中川孝秀, 金井保之, 市川雄一, 長友傑, 坂上和之

    日本加速器学会年会(Web)   14th   ROMBUNNO.IPP003 (WEB ONLY)   2017

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  • トリウム229極低エネルギーアイソマー準位探索の進展

    大久保翔, 岡井晃一, 岩崎達郎, 原秀明, 宮本祐樹, 増田孝彦, 植竹智, 吉見彰洋, 笹尾登, 吉村太彦, 吉村浩司, 山口敦史, 瀬戸誠, 北尾真司, 小林康浩, 増田亮, 依田芳卓, 笠松良崇, 重河優大, 安田勇輝, 小無健司, 渡部信, STELLMER Simon, SCHUMM Thorsten

    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   Rombun NO.21aSH‐12   2016.9

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  • 19aSJ-7 Demonstration of macro-coherent amplification by observing a coherent two-photon emission from hydrogen molecules

    Uetake Satoshi, Hara Hideaki, Katsuragawa Masayuki, Kuma Susumu, Masuda Takahiko, Miyamoto Yuki, Nakano Itsuo, Ohae Chiaki, Sasao Noboru, Tanaka Minoru, Tsutsumi Kosuke, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   22 - 22   2014.8

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  • 9pAW-12 Coherent two photon emission from the vibrational excited state of hydrogen molecules II

    Hara Hideaki, Katsuragawa Masayuki, Kuma Susumu, Masuda Takahiko, Miyamoto Yuki, Nakano Itsuo, Ohae Chiaki, Sasao Noboru, Tanaka Minoru, Tsutsumi Kousuke, Uetake Satoshi, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   93 - 93   2014.8

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  • 9pAW-11 Coherent two-photon emission from the vibrational excited states of hydrogen molecules I

    Miyamoto Yuki, Hara Hideaki, Katsuragawa Masayuki, Kuma Susumu, Masuda Takahiko, Nakano Itsuo, Ohae Chiaki, Sasao Noboru, Tanaka Minoru, Tsutumi Kousuke, Uetake Satoshi, Yoshimi Akihiro, Yoshimura Koji, Yoshimura Motohiko

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   92 - 92   2014.8

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  • 28pCF-7 Behavior of ultracold Yb-Li atomic mixture in an optical lattice

    Konishi Hideki, Hara Hideaki, Schafer Florian, Adachi Kyosuke, Nakajima Shuta, Takasu Yosuke, Takahashi Yoshiro

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   195 - 195   2014.3

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  • 24pEE-1 Realization of Simultaneous Quantum Degeneracy of Alkali and Alkaline-Earth-Like Atoms

    Hara H., Takasu Y., Nakajima S., Konishi H., Doyle John M., Takahashi Y.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   193 - 193   2011.8

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  • 28pRD-1 Simultaneous optical trapping of Li and Yb atoms II

    Hara H., Takasu Y., Yamaoka Y., Doyle John, Takahashi Y.

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   228 - 228   2011.3

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  • 23pRD-3 Simultaneous optical trapping of Li and Yb atoms

    Hara H., Takasu Y., Doyle John, Takahashi Y.

    Meeting abstracts of the Physical Society of Japan   65 ( 2 )   112 - 112   2010.8

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  • 26pZF-2 Laser cooling of Li and Yb atoms towards production of ultracold polar molecules of LiYb

    Okano M, Hara H, Muramatsu M, Uetake S, Takasu Y, Takahashi Y

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   2009.8

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  • Towards production of ultracold polar molecules of lithium-ytterbium

    OKANO Masayuki, HARA Hideaki, DOI Kodai, UETAKE Satoshi, TAKASU Yosuke, TAKASU Yosuke, TAKAHASHI Yoshiro, TAKAHASHI Yoshiro

    Proc 2008 Int Symp Phys Quantum Technol   148   2008

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  • 24pRH-4 24pRH-4 Photoassociation of heteronuclear molecules of ultracold Yb atoms

    Hara H., Enomoto K., Kitagawa M., Takasu Y., Takahashi Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   204 - 204   2007.8

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  • 20aXK-3 Determination of s-wave scattering lengths for all Yb isotopes via a two-color photoassociation

    Kitagawa M., Enomoto K., Kasa K., Hara H., Takahashi Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   156 - 156   2007.2

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  • 20aXK-4 Control of the scattering length of ultracold Yb atoms with an optical Feshbach resonance

    Enomoto K., Kasa K., Kitagawa M., Pholchai N., Hara H., Takahashi Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   157 - 157   2007.2

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Presentations

  • Coherent two-photon emission from hydrogen molecules towards neutrino mass spectroscopy International conference

    Hideaki Hara

    The 26th International Conference on Atomic Physics (ICAP2018)  2018.7 

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  • Coherence Generation by Counter-Propagating Photons Towards Neutrino Mass Spectroscopy International conference

    Hideaki Hara

    10th International Workshop on "Fundamental Physics Using Atoms" (FPUA2018)  2018.1 

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  • 中赤外光を用いたラダー型励起による水素分子振動準位間のコヒーレンス生成

    原秀明, 平木貴宏, 今村慧, 増田孝彦, 宮本祐樹, 笹尾登, 髙江洲義太郎, 植竹智, 吉見彰洋, 吉村浩司, 吉村太彦

    日本物理学会2017年秋季大会  2017.9 

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  • Coherent Amplification of Two-Photon Emission from Hydrogen Molecules Towards Neutrino Mass Spectroscopy International conference

    Hideaki Hara

    Gordon Research Conference (Atomic Physics)  2017.6 

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  • Two-Photon Emission from Coherently Excited Solid Parahydrogen International conference

    Hideaki Hara

    The 25th International Conference on Atomic Physics (ICAP2016)  2016.7 

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  • ニュートリノ質量分光に向けたXe原子のコヒーレンス生成

    岩崎達郎, 原秀明, 植竹智, 吉見彰洋, 吉田光宏, 笹尾登, 増田孝彦, 宮本祐樹, 吉村浩司, 吉村太彦

    日本物理学会第71回年次大会  2016.3 

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  • コヒーランス生成

    原秀明

    量子イオンビームの切り開く物理  2015.12.24 

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  • Coherent Two-Photon Emission Towards Neutrino Mass Spectroscopy using Atoms International conference

    Hideaki Hara

    8th International Workshop on "Fundamental Physics Using Atoms" (FPUA2015)  2015.11.30 

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  • Coherent Two-Photon Emission from Hydrogen Molecules International conference

    Hideaki Hara

    22th International Conference on Laser Spectroscopy (ICOLS2015)  2015.6 

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  • SPAN(原子を用いたニュートリノ質量分光実験)のためのマクロコヒーレント増幅機構の詳細研究II

    原秀明, 増田孝彦, 宮本祐樹, 中野逸夫, 笹尾登, 田中実, 植竹智, 吉見彰洋, 吉村浩司, 吉村太彦

    日本物理学会第70回年次大会  2015.3 

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  • 水素分子振動準位間のコヒーレント2光子放出II

    原秀明, 桂川眞幸, 久間晋, 増田孝彦, 宮本祐樹, 中野逸夫, 大饗千彰, 笹尾登, 田中実, 堤康輔, 植竹智, 吉見彰洋, 吉村浩司, 吉村太彦

    日本物理学会2014年秋季大会  2014.9 

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  • アルカリ原子とアルカリ土類様原子の量子縮退混合系の生成

    原秀明

    岡山大学 極限量子研究コア・量子宇宙研究センター合同セミナー  2013.9.30 

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  • アルカリ原子とアルカリ土類様原子の同時量子縮退の実現

    原秀明

    日本物理学会2011年秋季大会  2011.9 

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  • Quantum degenerate mixtures of alkali and alkaline-earth-like atoms International conference

    Hideaki Hara

    20th International Conference on Laser Spectroscopy (ICOLS2011)  2011.5 

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  • Li及びYb原子の同時光トラップII

    原秀明, 高須洋介, 山岡義史, John M. Doyle, 高橋義朗

    日本物理学会第66回年次大会  2011.3 

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  • Towards quantum degenerate mixture of Li-Yb atoms International conference

    Hideaki Hara

    JST/ERATO MACROSCOPIC QUANTUM CONTROL CONFERENCE ON ULTRACOLD ATOMS AND MOLECULES (UCAM2011)  2011.1 

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  • Li及びYb原子の同時光トラップ

    原秀明, 高須洋介, John M. Doyle, 高橋義朗

    日本物理学会2010年秋季大会  2010.9 

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  • 冷却イッテルビウム原子の異核分子光会合

    原秀明, 榎本勝成, 北川昌明, 高須洋介, 高橋義朗

    日本物理学会第62回年次大会  2007.9 

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Research Projects

  • 固体標的を用いたニュートリノ質量測定のための基礎研究

    Grant number:21H01112  2021.04 - 2024.03

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    原 秀明

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    Grant amount:\17160000 ( Direct expense: \13200000 、 Indirect expense:\3960000 )

    原子・分子の励起状態から光子を伴いニュートリノ対を発生する過程に対して、原子間コヒーレンスによって発生レートを増幅させることが研究の鍵となる。本研究には、高密度かつ低デコヒーレンスな標的を用いることが望ましいが、結晶にドープしたランタノイドイオンの4f電子に関係する遷移は、その標的候補となり得る。初年度はまず、ニュートリノ対放出時に発生する磁化を測定する可能性について検討した。この磁化測定は、弱い相互作用によるパリティの破れを利用したものであり、同時に増幅されるQED過程のバックグラウンドを排除することができる。標的に入射するレーザーの角度を変えた場合の磁化の分布が、ニュートリノ質量の値によって異なることが分かった。この結果は論文としてまとめ、出版した。その後、実際の結晶でのコヒーレンス実験に向けて検討を進めた。標的はエルビウムドープ結晶を考えているが、結晶中でコヒーレント増幅を実現するには、位相整合条件を満足させなければならない。実験は低温(4K)のクライオスタット中で行うので、4Kにおける結晶の屈折率が必要となるが、我々の知る限り、低温での屈折率の値は報告されていない。そこで現在、4Kでの屈折率測定に向けた準備実験を進めている。また、予備実験として行っていたYSO結晶にドープしたエルビウムイオンから発生する周期的超放射に関する考察や追加実験を進めた。これまでに、現象を定性的に説明するシンプルなモデルを構築し、励起レーザーパワー依存性の測定により、モデルの妥当性を確認した。

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  • Dark matter Axion search using quantum-coherence amplification mechanism

    Grant number:19H00686  2019.04 - 2023.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    笹尾 登, 宮本 祐樹, 平木 貴宏, 原 秀明

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    Grant amount:\45110000 ( Direct expense: \34700000 、 Indirect expense:\10410000 )

    本研究では、暗黒物質の有力候補であるアクシオン並びにダークフォトン(以下ではアクシオンと記す)を量子干渉による増幅機構(コヒーレンス)を用いて探索する。標的としては結晶(Er3+:YSO)あるいは原子(Cs)を想定している。前者については、本研究中に発見した周期的な超放射現象のより詳しい性質を明らかにした。即ち超放射遷移下位準位の寿命の実験的確定、超放射以外の放射(自然放射やいわゆるAmplified-Spontaneous-Emission等)の定量化、周期の入力パワー依存性などである。現在はこれらの実験結果を論文にまとめることを行っている。また実験とともに、この現象を説明する理論模型の構築と模型に基づくシミュレーションを整備した。模型は3準位系1次元の簡単なものであるが、結晶を一種の光学空洞とみなし、その減衰パラメータが周期的に変化することにより周期超放射を再現する。但し実験で観測されたパラメータ(超放射周期、そのパルス幅、パルス中の光子数等)を完全には説明しきれていない。
    一方セシウム原子を用いたアクシオン探索については、常温セルを用いた予備実験を遂行した。具体的には、基底状態(6s1/2)と励起状態(6p3/2)及び基底状態と励起状態(8p3/2)間のDoppler Free Spectroscopyを行い、既存のパラメータと一致することを確認した。 また実験に必要とされたレーザーを整備した。セシウム原子を用いたアクシオン探索実験については、Magneto-Optical-Trap (MOT)標的を用いて冷却原子を作り出す。MOTの性質を再現するシミュレーションコードの開発に着手した。また詳しい理論計算を行い、アクシオンおよびダークフォトン暗黒物質に対する到達感度を確定した。現在はこれらの結果を論文にするためにまとめを行っている。

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  • Development of equipment for laser excitation to the long-lived state of positronium

    Grant number:19K14741  2019.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    Hara Hideaki

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    We obtained the knowledge about a second harmonic generator and an amplification of the fundamental wave by a fiber amplifier, which are necessary for the development of the excitation laser source of positronium. Regarding the second harmonic generator, we succeeded in achieving an output power close to the designed value. As for the fiber amplifier, we succeeded in achieving high amplification and low amplified spontaneous emission noise. In this research, we developed at a wavelength different from the required wavelength, but by changing the wavelength, it is possible to obtain the laser source required for the excitation experiment. We also conducted studies related to two-photon excitation.

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  • 原子間コヒーレンスを利用した微弱な高次QED過程の増幅

    2017.04 - 2019.03

    日本学術振興会  科学研究費補助金(若手研究B) 

    原秀明

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  • 重イオンを用いた新奇光子ビーム生成機構の検証実験

    2016.04 - 2020.03

    日本学術振興会  科学研究費補助金(基盤研究A) 

    上垣外修一

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  • スピン自由度を持った超低温極性分子が拓く異方的長距離相互作用の物理

    2011.04 - 2013.03

    日本学術振興会  科学研究費補助金(特別研究員奨励費) 

    原秀明

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Class subject in charge

  • Introduction to Interdisciplinary Science 2 (2021academic year) Prophase  - 水1,水2