Exploring the Nα + 3n light nuclei via the (7Li, 7Be) reaction

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 ( 7 Li, 7 Be) charge-exchange reactions at around 8 MeV/u. Of particular astrophysical relevance are low-lying narrow resonances (Γ ∼ 200 keV 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 11 Be and 15 C 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.

A Constrained Analysis of the 40Ca(18O,18F)40K Direct Charge Exchange Reaction Mechanism at 275 MeV

“…Detailed information on the adopted theoretical modeling is given by Lenske et al (2018). This approach has been successfully used to also study other heavy-ion-induced SCE reactions (Cappuzzello et al, 2004a,b;Nociforo et al, 2006;Cavallaro, 2011).…”