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Title: β -Delayed One and Two Neutron Emission Probabilities Southeast of Sn132 and the Odd-Even Systematics in r -Process Nuclide Abundances
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  1. This manuscript reports on the direct observation of a β -delayed two-neutron emission in a study of In 134 at the ISOLDE Decay Station using neutron spectroscopy. We also report on the first measurement in β decay of the long-sought 13 / 2 + excited state in Sn 133 , 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 β -delayed two-neutron emission probabilities is essential to validate models used in astrophysical r -process nucleosynthesis calculations. Observing two-neutron emissions in β decay paves the way for new experiments to study energy and angular correlations for β -delayed multineutron emitters. 
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