https://doi.org/10.1140/epja/i2006-08-043-4
Nuclear Physics in Astrophysics II
Exploring the Nα + 3n light nuclei via the ( 7Li,7Be) reaction
1
INFN-Laboratori Nazionali del Sud, Via S. Sofia 62, 95123, Catania, Italy
2
Dipartimento di Fisica e Astronomia, Università di Catania, Via S. Sofia 64, 95123, Catania, Italy
3
INFN-Sezione di Catania, Via S. Sofia 64, 95123, Catania, Italy
4
Institut de Physique Nuclèaire, 91406, Orsay Cedex, France
5
Institut für Theoretische Physik, Universität Giessen, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
* e-mail: c.nociforo@gsi.de
Received:
18
June
2005
Accepted:
20
December
2005
Published online:
29
March
2006
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.
PACS: 21.10.Pc Single-particle levels and strength functions – / 21.60.-n Nuclear structure models and methods – / 25.70.Kk Charge-exchange reactions – / 27.20.+n 6 ⩽ A ⩽ 19 –
© Società Italiana di Fisica and Springer-Verlag, 2006