$^{11}$Be($\beta$p), a quasi-free neutron decay?

We have observed $\beta$-delayed proton emission from the neutron-rich nucleus $^{11}$Be by analysing a sample collected at the ISOLDE facility at CERN with accelerator mass spectrometry (AMS). With a branching ratio of (8.4 $\pm$ 0.6)$\times$ 10$^{-6}$ the strength of this decay mode, as measured b...

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Detalles Bibliográficos
Autores principales: Riisager, K., Forstner, O., Borge, M.J.G., Briz, J.A., Carmona-Gallardo, M., Fraile, L.M., Fynbo, H.O.U., Giles, T., Gottberg, A., Heinz, A., Johansen, J.G., Jonson, B., Kurcewicz, J., Lund, M.V., Nilsson, T., Nyman, G., Rapisarda, E., Steier, P., Tengblad, O., Thies, R., Winkler, S.R.
Lenguaje:eng
Publicado: 2014
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2014.03.062
http://cds.cern.ch/record/1647296
Descripción
Sumario:We have observed $\beta$-delayed proton emission from the neutron-rich nucleus $^{11}$Be by analysing a sample collected at the ISOLDE facility at CERN with accelerator mass spectrometry (AMS). With a branching ratio of (8.4 $\pm$ 0.6)$\times$ 10$^{-6}$ the strength of this decay mode, as measured by the B$_\mathrm{GT}$-value, is unexpectedly high. The result is discussed within a simple single-particle model and could be interpreted as a quasi-free decay of the $^{11}$Be halo neutron into a single-proton state.

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