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   https://doi.org/10.1103/PhysRevLett.130.122503  

   Palazzo, T.; Mitchell, A. J.; Lane, G. J.; Stuchbery, A. E.; Brown, B. A.; Reed, M. W.; Akber, A.; Coombes, B. J.; Dowie, J. T. H.; Eriksen, T. K.; et al (March 2023, Physical Review Letters)
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3. First $\beta$ -Delayed Two-Neutron Spectroscopy of the $r$ -Process Nucleus ${}^{134}\mathrm{In}$ and Observation of the $i_{13/2}$ Single-Particle Neutron State in ${}^{133}\mathrm{Sn}$

   https://doi.org/10.1103/l24v-5m31  

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   This manuscript reports on the direct observation of a $\beta$ -delayed two-neutron emission in a study of ${}^{134}\mathrm{In}$ at the ISOLDE Decay Station using neutron spectroscopy. We also report on the first measurement in ${\beta }^{-}$ decay of the long-sought $13/2^{+}$ excited state in ${}^{133}\mathrm{Sn}$ , attributed to be the neutron single-particle $i_{13/2}$ orbital. The observation of sequential neutron emission is used to extract the relative population of the $i_{13/2}$ state, which was found to be much smaller than the predictions of the statistical model. The experiment was possible because of the innovative use of a neutron array with neutron discrimination and interaction tracking capabilities. This is the first study of the details of the two-neutron emission for a nucleus, which belongs to the $r$ -process path. Understanding $\beta$ -delayed two-neutron emission probabilities is essential to validate models used in astrophysical $r$ -process nucleosynthesis calculations. Observing two-neutron emissions in ${\beta }^{-}$ decay paves the way for new experiments to study energy and angular correlations for $\beta$ -delayed multineutron emitters. 

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   https://doi.org/10.1103/v57q-45qj  

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