Using a microcalorimeter to measure the Lamb shift in hydrogenic gold and uranium on cooled, decelerated ion beams
A precise determination of the Lamb shift from photons emitted by highly charged, one electron ions represents one of the most sensitive tests of QED in strong electromagnetic fields. Recent progress in the production and cooling of intense beams of fully stripped Au and U in the SIS/ESR synchrotron...
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Published in | Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 520; no. 1-3; pp. 60 - 62 |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
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Elsevier B.V
11.03.2004
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Abstract | A precise determination of the Lamb shift from photons emitted by highly charged, one electron ions represents one of the most sensitive tests of QED in strong electromagnetic fields. Recent progress in the production and cooling of intense beams of fully stripped Au and U in the SIS/ESR synchrotron storage ring at GSI, Darmstadt has made it possible to obtain precision spectroscopy of these ions. A fully stripped beam of either Au79+ or U92+ ions is injected, stored and cooled in the ESR and interacts with an internal gas target. The capture of an electron and the subsequent population of a 2p or 3p state will lead to a decay by either Lyman or Balmer X-ray emission. Although measurements of the 1s Lamb shift in U with Ge ionization detectors accurate to ∼3% have provided a test of QED for the high Z domain, the experimental errors (±13eV) are about one order of magnitude larger than the accuracy theoreticians presently claim (±1eV). We present the results from initial broad band experiments using NTD Ge microcalorimeters to measure the 2s Lamb Shift in Au and U at the ESR. The broad band coverage of the microcalorimeter makes it possible to reduce the systematic uncertainties in the Doppler corrections while the high-energy resolution reduces the statistical error in the absolute energy calibration. |
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AbstractList | A precise determination of the Lamb shift from photons emitted by highly charged, one electron ions represents one of the most sensitive tests of QED in strong electromagnetic fields. Recent progress in the production and cooling of intense beams of fully stripped Au and U in the SIS/ESR synchrotron storage ring at GSI, Darmstadt has made it possible to obtain precision spectroscopy of these ions. A fully stripped beam of either Au79+ or U92+ ions is injected, stored and cooled in the ESR and interacts with an internal gas target. The capture of an electron and the subsequent population of a 2p or 3p state will lead to a decay by either Lyman or Balmer X-ray emission. Although measurements of the 1s Lamb shift in U with Ge ionization detectors accurate to ∼3% have provided a test of QED for the high Z domain, the experimental errors (±13eV) are about one order of magnitude larger than the accuracy theoreticians presently claim (±1eV). We present the results from initial broad band experiments using NTD Ge microcalorimeters to measure the 2s Lamb Shift in Au and U at the ESR. The broad band coverage of the microcalorimeter makes it possible to reduce the systematic uncertainties in the Doppler corrections while the high-energy resolution reduces the statistical error in the absolute energy calibration. |
Author | Austin, G. Stöhlker, Th Guth, G. Murray, S. Landis, D. Haller, E.E. Schnopper, H. Madden, N. Beeman, J. Silver, E. Ingram, R. |
Author_xml | – sequence: 1 givenname: E. surname: Silver fullname: Silver, E. email: esilver@cfa.harvard.edu organization: Smithsonian Astrophysical Observatory, Harvard, 60 Garden Street, Cambridge, MA 02138, USA – sequence: 2 givenname: H. surname: Schnopper fullname: Schnopper, H. organization: Smithsonian Astrophysical Observatory, Harvard, 60 Garden Street, Cambridge, MA 02138, USA – sequence: 3 givenname: G. surname: Austin fullname: Austin, G. organization: Smithsonian Astrophysical Observatory, Harvard, 60 Garden Street, Cambridge, MA 02138, USA – sequence: 4 givenname: R. surname: Ingram fullname: Ingram, R. organization: Smithsonian Astrophysical Observatory, Harvard, 60 Garden Street, Cambridge, MA 02138, USA – sequence: 5 givenname: G. surname: Guth fullname: Guth, G. organization: Smithsonian Astrophysical Observatory, Harvard, 60 Garden Street, Cambridge, MA 02138, USA – sequence: 6 givenname: S. surname: Murray fullname: Murray, S. organization: Smithsonian Astrophysical Observatory, Harvard, 60 Garden Street, Cambridge, MA 02138, USA – sequence: 7 givenname: N. surname: Madden fullname: Madden, N. organization: Lawrence Berkeley National Laboratory, USA – sequence: 8 givenname: D. surname: Landis fullname: Landis, D. organization: Lawrence Berkeley National Laboratory, USA – sequence: 9 givenname: J. surname: Beeman fullname: Beeman, J. organization: Lawrence Berkeley National Laboratory, USA – sequence: 10 givenname: E.E. surname: Haller fullname: Haller, E.E. organization: Lawrence Berkeley National Laboratory, USA – sequence: 11 givenname: Th surname: Stöhlker fullname: Stöhlker, Th organization: Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany |
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CitedBy_id | crossref_primary_10_1088_0031_8949_2011_T144_014060 crossref_primary_10_1016_j_nimb_2005_07_229 crossref_primary_10_1016_j_ppnp_2023_104031 crossref_primary_10_1088_1742_6596_72_1_012008 crossref_primary_10_1139_p07_028 crossref_primary_10_3390_atoms6040059 crossref_primary_10_1016_j_nimb_2017_04_078 crossref_primary_10_1088_1361_6455_50_5_055603 crossref_primary_10_1088_1742_6596_58_1_093 |
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Title | Using a microcalorimeter to measure the Lamb shift in hydrogenic gold and uranium on cooled, decelerated ion beams |
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