Trapped Radioactive Isotopes: icro-laboratories for fundamental Physics EDM in ground state (I=1/2)...
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Transcript of Trapped Radioactive Isotopes: icro-laboratories for fundamental Physics EDM in ground state (I=1/2)...
TTrappedrapped RRadioactiveadioactive IIsotopessotopes: : icro-laboratoriesicro-laboratories for fundamentalfor fundamental PPhysicshysics
EDM in ground state (I=1/2)EDM in ground state (I=1/2)H = -(d E + μ B) · I/I
mI = 1/2
mI = -1/2
2ω1 2ω2
d = 10-26 e cm, E = 100 kV/cm, = 15 *10-6 rad/s
parallel anti-parallel
d = Ie h
2 m cElectric Dipole Moment:
Precession Frequency:
= d · E / h
EB EB
ω1 ω2
TTrappedrapped RRadioactiveadioactive IIsotopessotopes: : icro-laboratoriesicro-laboratories for fundamentalfor fundamental PPhysicshysics
Laser cooling leaky systems: Barium
S. De et al., Phys. Rev. A 79 , 041402(R) (2009)S. De et al., Phys. Rev. A 79 , 041402(R) (2009)
● MOT signal
● Doppler-free beam signal
-80 -60 -40 -20 0 200
50
100
150
X 100
Rat
e [1
06 /s
]
Detuning @ 1 [MHz]
1S0
1P1
1D2
3D1 23
3D1
1
Multiple repump transitions
Efficient capture from atomic beam (>1%)
Radium similar level scheme. Laser cooling approach transferable
TTrappedrapped RRadioactiveadioactive IIsotopessotopes: : icro-laboratoriesicro-laboratories for fundamentalfor fundamental PPhysicshysics
Intrinsic sensitivity Intrinsic sensitivity RadiumRadium
3 3 3 32 1 1 2
3 32 1
| | | |
( ) ( )EDMD er P P H D
dE D E P
Octupole deformation for some Octupole deformation for some isotopesisotopes ( (225225Ra) Ra) enhancementenhancement
50-50050-500
482.7 nm
7s2 1S0
7s7p 1P1
7s7p 3P
7s6d 1D2
7s6d 3D1
23
2
10
714.3 nm
EDM Enhancement EDM Enhancement over over 199199Hg Hg
~ 40000 ~ 40000
Radium Level Scheme
TTrappedrapped RRadioactiveadioactive IIsotopessotopes: : icro-laboratoriesicro-laboratories for fundamentalfor fundamental PPhysicshysics
225225Ra 7sRa 7s22 11SS0 0 _ _ 7s7p 7s7p 11PP11
Strong transition for efficient laser cooling
Reference line in 130Te2 at 20715.4777 cm-1
130Te2130Te2
F = 1/2 - F = 3/2 F = 1/2 - F = 3/2
Hyperfine Structure 4198(4) MHz
482.7 nm
7s2 1S0
7s7p 1P1
7s7p 3P
7s6d 1D2
7s6d 3D 1 2
3
2
10
714.3 nm