Person: Briz Monago, José Antonio
Faculty / Institute
Sizeable beta-strength in ^31 Ar (β3p) decay
2014-10-07, Koldste, G. T., Blank, B., Borge, M. J. G., Briz Monago, José Antonio, Carmona Gallardo, Mariano, Fraile Prieto, Luis Mario, Fynbo, H. O. U., Giovinazzo, J., Johansen, J. G., Jokinen, A., Jonson, B., Kurturkian Nieto, T., Nilsson, T., Perea, A., Pesudo, V., Picado, E., Riisager, K., Saastamoinen, A., Tengblad, O., Thomas, J. C., Van de Walle, J.
We present for the first time precise spectroscopic information on the recently discovered decay mode β-delayed 3p-emission. The detection of the 3p events gives an increased sensitivity to the high energy part of the Gamow–Teller strength distribution from the decay of ^31 Ar revealing that as much as 30% of the strength resides in the β3p-decaymode. Asimplified description of how the main decay modes evolve as the excitation energy increases in ^31 Cl is provided.
Be11(βp), a quasi-free neutron decay?
2014-04-04, Riisager, K., Forstner, O., Borges, M. J. G., Briz Monago, José Antonio, Carmona Gallardo, Mariano, Fraile Prieto, Luis Mario, 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.
We have observed β−-delayed proton emission from the neutron-rich nucleus 11Be by analyzing a sample collected at the ISOLDE facility at CERN with accelerator mass spectrometry (AMS). With a branching ratio of (8.3±0.9)· 10−6 the strength of this decay mode, as measured by the BGT -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 11Be halo neutron into a single-proton state.