Abstract.
Experimental signatures of the dynamical correlations of a core with a single-particle neutron have been found in light neutron-rich nuclei investigated via the ( 7Li, 7Be) charge-exchange reactions at around 8MeV/u. Of particular astrophysical relevance are low-lying narrow resonances ( Γ ∼ 200keV FWHM) BSEC (Bound States Embedded in the Continuum). Because of their long lifetime BSEC states are likely to effect the capture rates in any scenario for nucleosynthesis in neutron-rich environment. They have been observed in the continuum of 11Be and 15C nuclei. A microscopic nuclear structure model based on QRPA theory, which takes into account Dynamical Core Polarisation (DCP) correlations, gives a suitable description of these resonances as well as single-particle states of the studied systems. In this context, high-energy narrow structures populated in nuclei having an integer number of α-particles plus three neutrons are good BSEC candidates and can be systematically investigated.
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Nociforo, C., Cappuzzello, F., Cunsolo, A. et al. Exploring the Nα + 3n light nuclei via the ( 7Li,7Be) reaction. Eur. Phys. J. A 27 (Suppl 1), 283–288 (2006). https://doi.org/10.1140/epja/i2006-08-043-4
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DOI: https://doi.org/10.1140/epja/i2006-08-043-4