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1. Optical Mass Spectrometry of Cold ${\mathrm{RaOH}}^{+}$ and ${{\mathrm{RaOCH}}_3}^{+}$

   https://doi.org/10.1103/PhysRevLett.126.023002  

   Fan, M.; Holliman, C. A.; Shi, X.; Zhang, H.; Straus, M. W.; Li, X.; Buechele, S. W.; Jayich, A. M. (January 2021, Physical Review Letters)

   null (Ed.)
2. Spectral measurement of the ${}^{214}$ Bi $\beta$ decay to the ${}^{214}$ Po ground state with XENONnT

   https://doi.org/10.1103/b3r7-6ff4  

   XENON_Collaboration (February 2026, Physical Review C)

   We report the measurement of the 214Bi β-decay spectrum to the ground state of 214Po using the XENONnT detector. This decay is classified as first-forbidden nonunique, for which theoretical predictions require detailed nuclear structure modeling. A dedicated identification algorithm isolates a high-purity sample of ground-state β decays, explicitly excluding events with associated γ -ray emission. By comparing the measured spectrum, which covers energies up to 3.27 MeV, with several nuclear models, we find that the prediction based on the conserved vector current hypothesis provides the best description of the data. Using this dataset, we additionally derive charge and light yield curves for electronic recoils, extending detector response modeling up to the megaelectronvolt scale. 

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3. First measurement of ${\nu }_{\mu }$ charged-current ${\pi }^0$ production on argon with the MicroBooNE detector

   https://doi.org/10.1103/PhysRevD.99.091102  

   Adams, C.; Alrashed, M.; An, R.; Anthony, J.; Asaadi, J.; Ashkenazi, A.; Auger, M.; Balasubramanian, S.; Baller, B.; Barnes, C.; et al (May 2019, Physical Review D)
4. Solar neutrinos and ${\nu }_2$ visible decays to ${\nu }_1$

   https://doi.org/10.1103/PhysRevD.109.013003  

   de_Gouvêa, André; Weill, Jean; Sen, Manibrata (January 2024, Physical Review D)

   Experimental bounds on the neutrino lifetime depend on the nature of the neutrinos and the details of the potentially new physics responsible for neutrino decay. In the case where the decays involve active neutrinos in the final state, the neutrino masses also qualitatively impact how these manifest themselves experimentally. In order to further understand the impact of nonzero neutrino masses, we explore how observations of solar neutrinos constrain a very simple toy model. We assume that neutrinos are Dirac fermions and there is a new massless scalar that couples to neutrinos such that a heavy neutrino— ${\nu }_2$with mass $m_2$—can decay into a lighter neutrino— ${\nu }_1$with mass $m_1$—and a massless scalar. We find that the constraints on the new physics coupling depend, sometimes significantly, on the ratio of the daughter-to-parent neutrino masses and that, for large-enough values of the new physics coupling, the “dark side” of the solar neutrino parameter space— ${\sin }^2{\theta }_{12}\sim 0.7$—provides a reasonable fit to solar neutrino data, if only ${}^8\mathrm{B}$or ${}^7\mathrm{Be}$neutrino data alone are considered, but no allowed region is found in the combined analysis. Our results generalize to other neutrino-decay scenarios, including those that mediate ${\nu }_2\to {\nu }_1{\overline{\nu }}_3{\nu }_3$when the neutrino mass ordering is inverted mass and $m_2>m_1\gg m_3$, the mass of ${\nu }_3$. Published by the American Physical Society2024 

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5. Mass of helium-4 from the cyclotron frequency ratio ${}^4$ He ${}^{+}$ / ${}^{12}$ C ${}^{3+}$

   https://doi.org/10.1103/xzmk-r533  

   Davila, MF; Restrepo, MM; Navarro, C; Myers, EG (May 2026, Physical Review Letters)