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This manuscript reports on the direct observation of a β-delayed two-neutron emission in a study of 134In 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 133Sn, attributed to be the neutron single-pa...

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Authors: Dyszel, P., Grzywacz, R., Xu, Z. Y., Kitamura, N., Karny, M., Korgul, A., Madurga, M., Neupane, S., Algora, A., Andreyev, A. N., Araszkiewicz, M., Bark, R. A., Benito García, Jaime, Bernier, Nikita, Borge, M. J. G., Caballero Rodríguez, Miriam, Chuchala, P., Cocolios, T. E., Costache, C., Cubiss, J. G., DeWitte, H., Escher, J. E., Fernandez-Ruiz, D., Fijalkowska, A., Fraile Prieto, Luis Mario, Fynbo, H. O. U., Gouge, J., López Herraiz, Joaquín, Illana Sisón, Andrés, Jones, P. M., Judson, D. S., Kamińska, P., Kawano, T., Kolos, K., Labiche, M., Lică, R., Llanos Expósito, Mario, Grarcía de Lorenzo, Gabriel, Marginean, N., Michelon, I., Mihai, C., Nácher, E., Neacsu, C., Nielsen, J. S., Olaizola, B., Orce, J. N., Page, C. A. A., Page, R. D., Pakarinen, J., Perea, A., Piersa-Silkowska, Monika, Podolyák, Zs., Prieto, J. S., Rajabali, M., Shaw, J., Sison, A. I., Solak, K., Stryjczyk, M., Tengblad, O., Vicente, P. G. T., Warr, N., Wilson, J., Yue, Z., Zajda, S.
Format: article
Publication Date:2025
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/131526
Online Access:https://hdl.handle.net/20.500.14352/131526
Access Level:Open access
Keyword:539.1
Versatile array
Detertors
Fission
Física nuclear
2207 Física Atómica y Nuclear
Description
Summary:This manuscript reports on the direct observation of a β-delayed two-neutron emission in a study of 134In 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 133Sn, attributed to be the neutron single-particle i13/2 orbital. The observation of sequential neutron emission is used to extract the relative population of the i13/2 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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