Ultrahigh precision observation of nuclear spin precession and application to EDM measurement T. Inoue, T. Furukawa, H. Hayashi, M. Tsuchiya, T. Nanao, A. Yoshimi A , M. Uchida, and K. Asahi Department of Physics, Tokyo Institute of Technology A Nishina Center, RIKEN International Workshop on Physics of Nuclei at Ext @TITech, Japan 26. Jan.
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Ultrahigh precision observation of nuclear spin precession and application to EDM measurement
Ultrahigh precision observation of nuclear spin precession and application to EDM measurement. T. Inoue, T. Furukawa, H. Hayashi, M. Tsuchiya, T. Nanao, A. Yoshimi A , M. Uchida, and K. Asahi Department of Physics, Tokyo Institute of Technology A Nishina Center, RIKEN. - PowerPoint PPT Presentation
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Ultrahigh precision observation of nuclear spin precession
andapplication to EDM measurement
T. Inoue, T. Furukawa, H. Hayashi, M. Tsuchiya, T. Nanao, A. YoshimiA, M. Uchida, and K. Asahi
Department of Physics, Tokyo Institute of TechnologyANishina Center, RIKEN
International Workshop on Physics of Nuclei at Extremes@TITech, Japan 26. Jan. 2010
Outline◇Electric Dipole Moment (EDM)- EDM and T - violation- Status of EDM experiment
◇ 129Xe “active” nuclear spin maser- Character of 129Xe atom- Experimental apparatus- Optical pumping and optical detection- Nuclear spin maser
◇ Experimental result- Present status of spin maser
◇ On going R & D- Feedback system of solenoid current- Improvement of the optical pumping efficiency
◇ Summary and future
0d : T-violation CP-violation (by CPT theorem)
Search for EDM Test of the SM and beyond SM Search for EDM Test of the SM and beyond SM (no SM background)(no SM background)
Non-zero EDM associated with spin isdirect evidence of time reversal symmetry violation
Standard Model (SM) : Predicted neutron EDM is about 105 smaller than the present experimental upper limits.Beyond SM : Detectable EDM
EDM : sensitive to the CP-violation beyond SM
rrrd 3
particlede
Classical representation
sd ˆd
Vector(parallel to spin)
Time reversal Time reversal : : TT t →→ -t
s →→ -sd →→ d
TimeTimeSpinSpinEDMEDM
::::::
s
-- -
++ +
d -s
-- -
++ +
d
Electric Dipole Moment (EDM)
Standard Model(dn = 10-31 ~ 10-33 ecm)
Pendlebury and Hinds,
NIM A 440 (00) 471d(129Xe) < 4.1×10-27 ecmRosenberry and Chupp, PRL 86 (2001) 22
Spherical cell・ good symmetry・ scattering of pumping light<= decrease of optical pumping efficiency?
Cubic cell preparation
Am
plit
ude
[V]
Am
plit
ude
[V]
Am
plit
ude
[V]
Am
plit
ude
[V]
time [sec]
time [sec] counts
counts
Maser amplitude (steady state)Fiber laser
Array laser
Maser amplitude : Fiber laser v.s. Array laser
~ 4 times deterioration
Summary and Future
○ The frequency precision of 9.3 nHz (measurement time 30,000 sec) was obtained by operating the “active” spin maser.
○ The feedback system of the solenoid current is being constructed in order to suppress the current drift.
○ The fiber laser as the pumping laser was installed. However the fluctuation of the maser amplitude did not improve. The cubic cells are now being prepared.
Further improvements and developments are now in progress. :◎ Constriction of the electric field application system
◎ Development of the highly sensitive magnetometer based on NMOR; Nonlinear Magneto-Optical Rotation.