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Determine the excitation energy of the second long-lived isomer in 152Pm

Determine the excitation energy of the second long-lived isomeric state in promethium-152, for which the excitation energy is currently unknown, complementing the known 150 keV isomer and enabling unambiguous mass and spectroscopic analyses.

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Background

The authors note that 152Pm has two long-lived isomeric states: one with E_X = 150 keV and another with unknown excitation energy. Presence of such isomers can affect peak identification and mass correlations in MRTOF-MS spectra, particularly when isomers are unresolved.

Measuring the excitation energy of the second isomer would reduce uncertainties in mass assignments and improve model comparisons in the neutron-rich lanthanoid region.

References

Two long-lived isomeric states of $E_{\rm X} = 150~{\rm keV}$ and unknown excitation energy have been reported for ${}{152}{\rm Pm}$.

— Comprehensive mass measurement study of ${}^{252}$Cf fission fragments with MRTOF-MS and detailed study of masses of neutron-rich Ce isotopes (2402.03873 - Kimura et al., 6 Feb 2024) in Subsection “A/q=76.0” in Section “Results and Discussion”