DOE OSTI ยท 2510894
Determination of nuclear charge radius by extreme-ultraviolet spectroscopy of Na-like ions
Abstract
We report on a method for determining the absolute nuclear charge radius of high-๐ elements using extreme-ultraviolet spectroscopy of highly charged Na-like ions in tandem with highly accurate atomic structure calculations of transition energy differences. The application of this method has reduced the nuclear charge radius uncertainty of 191 Ir by a factor of 8 from the currently accepted literature value, with a recently reported charge radius of 5.435(12) fm. The result reduces the charge radius uncertainty along the full Ir isotopic chain when combined with prior optical isotope shift measurements. The technique utilizes only a few million ions stored in an ion trap, which should apply to measurements with small quantities of radioactive nuclei.
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Hosier, A. [Clemson University, SC (United States); National Institute of Standards and Technology, Gaithersburg, MD (United States)] (ORCID:0000000328366605), Dipti, None [National Institute of Standards and Technology, Gaithersburg, MD (United States)], Blundell, S. A. [University of Grenoble Alpes (France)], Lapierre, A. [Facility for Rare Isotope Beams, East Lansing, MI (United States)] (ORCID:0000000208706329), Silwal, R. [Appalachian State University, Boone, NC (United States)], Gwinner, G. [University of Manitoba (Canada)] (ORCID:0000000267444365), Tan, J. N. [National Science Foundation, Alexandria, VA (United States)] (ORCID:000000027762022X), Naing, A. [National Institute of Standards and Technology, Gaithersburg, MD (United States)], Gillaspy, J. D. [National Institute of Standards and Technology, Boulder, CO (United States); National Science Foundation, Alexandria, VA (United States)] (ORCID:0009000439380247), Yang, Y. [Clemson University, SC (United States); National Institute of Standards and Technology, Gaithersburg, MD (United States)] (ORCID:0000000201673245), Szypryt, P. [National Institute of Standards and Technology, Boulder, CO (United States)] (ORCID:0000000201843419), O'Neil, G. [National Institute of Standards and Technology, Boulder, CO (United States)] (ORCID:0000000334502263), Staiger, H. [Clemson University, SC (United States); National Institute of Standards and Technology, Gaithersburg, MD (United States)] (ORCID:0009000068560037), Dreiling, J. M. [National Institute of Standards and Technology, Gaithersburg, MD (United States)], Villari, A. C. C. [Facility for Rare Isotope Beams, East Lansing, MI (United States)], Angeli, I. [University of Debrecen (Hungary)] (ORCID:0009000970311596), Ralchenko, Yu. [National Institute of Standards and Technology, Gaithersburg, MD (United States)] (ORCID:0000000300839554), Takacs, E. [Clemson University, SC (United States); National Institute of Standards and Technology, Gaithersburg, MD (United States)] (ORCID:0000000224275362). 2025-02-03. Determination of nuclear charge radius by extreme-ultraviolet spectroscopy of Na-like ions. https://doi.org/10.1103/physrevresearch.7.l012024
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