High-Resolution Laser Spectroscopy of Long-Lived Plutonium Isotopes

Abstract

Long-lived isotopes of plutonium were studied using two complementary techniques, high-resolution resonance ionisation spectroscopy (HR-RIS) and collinear laser spectroscopy (CLS). Isotope shifts have been measured on the $5f^{6}7s^2{}^7{F}_0\to 5f^{5}6d^{2}7s(J=1)$ and $5f^{6}7s^2{}^7{F}_1\to 5f^{6}7s7p(J=2)$ atomic transitions using the HR-RIS method and the hyperfine factors have been extracted for the odd mass nuclei ${}^{239,241}$Pu. Collinear laser spectroscopy was performed on the $5f^{6}7s{}^8{F}_{1/2}\to J=1/2(27523.61{\text{cm}}^{-1})$ ionic transition with the hyperfine $A$ factors measured for ${}^{239}$Pu. Changes in mean-squared charge radii have been extracted and show a good agreement with previous non-optical methods, with an uncertainty improvement by approximately one order of magnitude. Plutonium represents the heaviest element studied to date using collinear laser spectroscopy.

arXiv commentaccepted by Phys. Rev. A (2017-03-02)

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Cited by in corpus (5)

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• Production of neptunium and plutonium nuclides from uranium carbide using 1.4-GeV protons