Precise Determination of the 1s Lamb Shift in Hydrogen-Like Lead and Gold Using Microcalorimeters
2017
Quantum electrodynamicsin very strong Coulomb fields is one scope which has not yet been tested experimentally with sufficient accuracy to really determine whether the perturbative approach is valid. One sensitive test is the determination of the 1s
Lamb shiftin highly-charged very heavy ions. The 1s
Lamb shiftof hydrogen-like lead (Pb81+) and gold (Au78+) has been determined using the novel detector concept of silicon microcalorimeters for the detection of
hard x-rays. The results of eV for lead and eV for gold are within the
error barsin good agreement with theoretical predictions. To our knowledge, for hydrogen-like lead, this represents the most accurate determination of the 1s
Lamb shift.
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