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Published byStephen Warren Modified over 9 years ago
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Trapped Radioactive Isotopes: icro-laboratories for fundamental Physics EDM in ground state (I=1/2) H = -(d E + μ B) · I/I m I = 1/2 m I = -1/2 2ω12ω1 2ω22ω2 d = 10 -26 e cm, E = 100 kV/cm, = 15 *10 -6 rad/s parallel anti-parallel d = I e h 2 m c Electric Dipole Moment: Precession Frequency: = d · E / h EBEB ω1ω1 ω2ω2
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Trapped Radioactive Isotopes: icro-laboratories for fundamental Physics Laser cooling leaky systems: Barium S. De et al., Phys. Rev. A 79, 041402(R) (2009) 1S01S0 1P11P1 1D21D2 3D3D 1 2 3 3D13D1 1 Multiple repump transitions Efficient capture from atomic beam (>1%) Radium similar level scheme. Laser cooling approach transferable
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Trapped Radioactive Isotopes: icro-laboratories for fundamental Physics Intrinsic sensitivity Radium Octupole deformation for some isotopes ( 225 Ra) enhancement 50-500 482.7 nm 7s 2 1 S 0 7s7p 1 P 1 7s7p 3 P 7s6d 1 D 2 7s6d 3 D 1 2 3 210210 714.3 nm EDM Enhancement over 199 Hg ~ 40000 Radium Level Scheme
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Trapped Radioactive Isotopes: icro-laboratories for fundamental Physics 225 Ra 7s 2 1 S 0 _ 7s7p 1 P 1 Strong transition for efficient laser cooling Reference line in 130 Te 2 at 20715.4777 cm -1 130 Te 2 F = 1/2 - F = 3/2 Hyperfine Structure 4198(4) MHz 482.7 nm 7s 2 1 S 0 7s7p 1 P 1 7s7p 3 P 7s6d 1 D 2 7s6d 3 D 1 2 3 210210 714.3 nm
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