First β-delayed two-neutron spectroscopy of the r-process nucleus ^{134}In and observation of the i_{13/2} single-particle neutron State in ^{133}Sn
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Date
2025
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Abstract
This manuscript reports on the direct observation of a β-delayed two-neutron emission in a study of ^{134}In 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 ^{133}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 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.
Description
Keywords
neutron, prediction, probability, spectroscopy, statistical model
Citation
Dyszel, P., Grzywacz, R., Xu, Z.Y., Kitamura, N., Karny, M., Korgul, A., Madurga, M., Neupane, S., Algora, A., Andreyev, A.N. and Araszkiewicz, M., 2025. First 𝛽-Delayed Two-Neutron Spectroscopy of the 𝑟-Process Nucleus 134In and Observation of the 𝑖13/2 Single-Particle Neutron State in 133Sn. Physical Review Letters, 135(15).