T. Nanao
Tokyo Institute of Technology
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Featured researches published by T. Nanao.
Physics of Particles and Nuclei | 2014
K. Asahi; Yuichi Ichikawa; Masatoshi Chikamori; Yuichi Ohtomo; Eri Hikota; T. Suzuki; T. Inoue; T. Furukawa; A. Yoshimi; K. Suzuki; T. Nanao; H. Miyatake; Masato Tsuchiya; N. Yoshida; Hazuki Shirai; Takashi Ino; H. Ueno; Yukari Matsuo; Takeshi Fukuyama
We aim to measure the electric dipole moment (EDM) of a diamagnetic atom 129Xe using an optical-detection nuclear spin maser technique. The relation of EDM in a diamagnetic atom to nuclear Schiff moment and fundamental sources generating it is discussed, and the present status for the development of our experimental setup is presented.
Prepared for | 2011
Takeshi Furukawa; Masato Tsuchiya; T. Nanao; K. Asahi; A. Yoshimi; Takeshi Inoue; Hironori Hayashi; M. Uchida
Magnetic field stabilization is a crucial condition parameter for many kinds of ultra-high precision measurements such as a search for an electric dipole moment (EDM). The instability of magnetic field strength often arises from the drift of current flow in a solenoid coil to generate the magnetic field. For our EDM search experiment with maser oscillating diamagnetic 129Xe atoms, we have developed a new stabilized current source based on a feedback system which is devised to correct the amount of current flow measured precisely with high-precision digital multimeter and standard resistor. Using this new current source, we have successfully reduced the drifts of coil current by at least a factor of 100 compared to commercially available current sources.
Journal of Physics: Conference Series | 2011
Takeshi Furukawa; Takeshi Inoue; T. Nanao; A. Yoshimi; Masato Tsuchiya; Hironori Hayashi; M. Uchida; K. Asahi
Magnetic field stabilization is a crucial condition parameter for many kinds of ultra-high precision measurements such as a search for an electric dipole moment (EDM). The instability of magnetic field strength often arises from the drift of current flow in a solenoid coil to generate the magnetic field. For our EDM search experiment with maser oscillating diamagnetic 129Xe atoms, we have developed a new stabilized current source based on a feedback system which is devised to correct the amount of current flow measured precisely with high-precision digital multimeter and standard resistor. Using this new current source, we have successfully reduced the drifts of coil current by at least a factor of 100 compared to commercially available current sources.
Journal of Physics: Conference Series | 2012
Y. Ichikawa; H. Ueno; Y. Ishii; Takeshi Furukawa; A. Yoshimi; Daisuke Kameda; Hiroshi Watanabe; N. Aoi; K. Asahi; Dimiter L. Balabanski; R. Chevrier; J.M. Daugas; N. Fukuda; G. Georgiev; Hironori Hayashi; H. Iijima; N. Inabe; T. Inoue; M. Ishihara; T. Kubo; T. Nanao; T. Ohnishi; K. Suzuki; Masato Tsuchiya; Hiroyuki Takeda; M. M. Rajabali
To produce a radioactive-isotope (RI) beam with high spin alignment, we have developed a novel method, the two-step projectile-fragmentation (PF) method, that employs momentum-dispersion matching. An on-line experiment to produce 32A1 from 48Ca via 33A1 was performed at RIKEN RI Beam Factory. In the experiment, we succeeded in producing approximately 8% spin alignment in an RI beam of 32A1. In this paper, we focus on evaluating the magnitude of spin alignment realized in one-nucleon removal from 33A1.
Journal of Physics: Conference Series | 2011
Takeshi Inoue; Masato Tsuchiya; Hironori Hayashi; T. Nanao; K. Suzuki; A. Yoshimi; Takeshi Furukawa; M. Uchida; K. Asahi
Present status of the development of a nuclear spin maser for a 129Xe atomic EDM search is reported. We studied the frequency behavior of the spin maser presently under operation, and found that the drift in the frequency is correlated with the maser amplitude drift. Also, a high-voltage application system for the 129Xe precession cell was constructed. The leakage current measured is at present on the level of nA when a high voltage of 10 kV was applied, and is a subject of improvement to be achieved in near future.
Journal of Physics: Conference Series | 2011
Takeshi Furukawa; Takeshi Inoue; T. Nanao; A. Yoshimi; Masato Tsuchiya; Hironori Hayashi; M. Uchida; K. Asahi
Magnetic field stabilization is a crucial condition parameter for many kinds of ultra-high precision measurements such as a search for an electric dipole moment (EDM). The instability of magnetic field strength often arises from the drift of current flow in a solenoid coil to generate the magnetic field. For our EDM search experiment with maser oscillating diamagnetic 129Xe atoms, we have developed a new stabilized current source based on a feedback system which is devised to correct the amount of current flow measured precisely with high-precision digital multimeter and standard resistor. Using this new current source, we have successfully reduced the drifts of coil current by at least a factor of 100 compared to commercially available current sources.
Journal of Physics: Conference Series | 2011
T. Nanao; A. Yoshimi; T. Inoue; Takeshi Furukawa; Masato Tsuchiya; Hironori Hayashi; M. Uchida; K. Asahi
Developments are in progress aiming at the search for a permanent Electric Dipole Moment (EDM) in 129Xe atom using a low-frequency nuclear spin maser. In the EDM experiment, drifts in the applied static magnetic field in a long time scale are the dominating source of errors in frequency determination. The stability of the applied field and its monitoring by use of a high sensitivity magnetometer are thus the indispensable part of the EDM experiment. We are developing a magnetometer based on the Nonlinear Magneto-Optical Rotation (NMOR) effect in Rb atom. The sharp response to the magnetic field in this apparatus relies on a long relaxation time of the atomic spin alignment induced by linearly polarized laser light, and thus the suppression of the atomic decoherence should be essential for its sensitivity. Coating the inner walls of the cell with an antirelaxation layer, introducing a buffer gas in the cell and cancelling the transverse magnetic field should be effective in preventing atoms from depolarization. We obtained several NMOR spectra for Rb in cylindrical cells in such attempts. Up to now a sensitivity of ?B=1.5 ? 10?5 G has been attained in the present setup.
Journal of Physics: Conference Series | 2011
K. Asahi; Takeshi Furukawa; T. Inoue; A Yoshimi; T. Nanao; Masatoshi Chikamori; K. Suzuki; Masato Tsuchiya; Hironori Hayashi; M. Uchida; H Ueno; Y Matsuo; Takeshi Fukuyama
Development of a nuclear spin oscillator intended for the experimental search for an electric dipole moment in 129Xe atom is reported. The spin oscillation is brought about by polarizing 129Xe nuclear spins by spin exchange with optically polarized Rb atoms, detecting the spin precession through the transmission of a circularly polarized laser light, and applying a feedback field according to the detected spins. Until present, a frequency precision, in a measurement time of T = 45,000 s, of δν = 5.2 nHz has been achieved.
Nature Physics | 2012
Yuichi Ichikawa; H. Ueno; Y. Ishii; T. Furukawa; A. Yoshimi; Daisuke Kameda; Hiroshi Watanabe; N. Aoi; K. Asahi; Dimiter L. Balabanski; R. Chevrier; Jean Michel Daugas; N. Fukuda; G. Georgiev; Hironori Hayashi; H. Iijima; N. Inabe; Takeshi Inoue; M. Ishihara; Toshiyuki Kubo; T. Nanao; T. Ohnishi; K. Suzuki; Masato Tsuchiya; Hiroyuki Takeda; M. M. Rajabali
Physics Letters A | 2012
A. Yoshimi; T. Inoue; T. Furukawa; T. Nanao; K. Suzuki; Masatoshi Chikamori; Masato Tsuchiya; Hironori Hayashi; M. Uchida; N. Hatakeyama; Sota Kagami; Yuichi Ichikawa; H. Miyatake; K. Asahi