Trapped Radioactive Isotopes: icro-laboratories for fundamental Physics EDM in ground state (I=1/2)...

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T rapped rapped R adioactive adioactive I sotopes sotopes : : icro-laboratories icro-laboratories for fundamental for fundamental P hysics hysics EDM in ground state (I=1/2) EDM in ground state (I=1/2) H = -(d E + μ B) · I/I m I = 1/2 m I = - 1/2 1 2 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 E B E B ω 1 ω 2

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