研究目的
Measuring the difference in nuclear charge radius of Xe isotopes by EUV spectroscopy of highly charged Na-like ions.
研究成果
The mean-square nuclear charge radius difference between 136Xe and 124Xe was found to be δ(cid:2)r 2(cid:3)136,124 = 0.269(42) fm2. This result has smaller uncertainty than previous experimental results and agrees with the literature values. The method demonstrates the viability of EUV spectroscopy of Na-like ions for accurate nuclear-size measurements for heavy nuclei.
研究不足
The experimental uncertainty was dominated by counting statistics. Theoretical uncertainties included the mass shift and field shift calculations, as well as higher-order nuclear moments.
1：Experimental Design and Method Selection:
The experiment utilized extreme ultraviolet spectroscopy of highly charged Na-like ions to measure the isotope shift between 124Xe and 136Xe isotopes. The mass-shift and field-shift coefficients were calculated using relativistic many-body perturbation theory and multiconfiguration Dirac-Hartree-Fock method.
2：Sample Selection and Data Sources:
Isotopically pure 136Xe and 124Xe neutral gases were alternately injected into the electron-beam ion-trap (EBIT) facility at the National Institute of Standards and Technology.
3：List of Experimental Equipment and Materials:
Electron-beam ion-trap (EBIT) facility, liquid-nitrogen-cooled EUV charge-coupled-device (CCD) camera, flat-field EUV grating spectrometer.
4：Experimental Procedures and Operational Workflow:
The EBIT was operated at 6.0 keV electron-beam energy and 150 mA electron-beam current to optimize the production of the Na-like Xe charge state. EUV spectra were collected for five minutes each, using the CCD camera attached to the spectrometer.
5：0 keV electron-beam energy and 150 mA electron-beam current to optimize the production of the Na-like Xe charge state. EUV spectra were collected for five minutes each, using the CCD camera attached to the spectrometer.
Data Analysis Methods:
5. Data Analysis Methods: The centroid positions of the Na-like D1 transition were determined in each individual spectrum and fitted to polynomial functions to account for long-term variation. The isotope shift was determined from the difference in centroid positions between the two isotopes.
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