Nuclear Charge Radius of 6He Madhusudan Ojha PHYSICS 621

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Nuclear Charge Radius of 6He- Madhusudan Ojha(
PHYSICS 621)

• 6He(t1/2807 ms) offers the unique opportunity to
  study interactions in low density neutron rich
  matter.

• Measurement of charge radii can probe the
  interaction of the neutron halo with the
  4He-like core.

Method
6 He Energy level

• This measurement helps to reveal the
• three-nucleon forces inside the nucleus

• The results of the measurements is compared with
  values predicted by various clusture models
• The result is also compared with ab initio QMC
• calculations using a modern nuclear potential.

IS(23S1-23P2) 34473.625(13) MHz
1.210(ltrc2gtHe4- ltrc2gtHe6)MHz/fm2 IS(23S1-33P2)
43196.202(16)MHz 1.008 (ltrc2gtHe4-
ltrc2gtHe6)MHz/fm2
Atomic Theory Calculation (Drake G.,2004)
100 KHz error in IS 1 error in 6He radius.
Present Experiment
Challege High Precision Requirement
Charge Radius of 4He 1.673(1) fm, spectroscopy
of muonic 4He, E.Borie et al(1978)
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6He Single Atom Spectroscopy
6He trapping rate2/min
Atom Trapping of 6He
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6He Nuclear Charge Radius

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A proving Ground for Nuclear Structure Theories
ltrc2gt1/2 1.9120.018 fm