The study of high-lying, high-spin, three-nucleon-cluster states in ¹⁹F and ¹⁹Ne through heavy ion induced three nucleon transfer reactions

Abstract

The high-excitation, high-spin selectivities of heavy ion induced multi-nucleon transfer reactions were exploited to identify high-spin, three-nucleon cluster-like states in ¹⁹F and ¹⁹Ne via the ¹⁶O(¹⁰B, ⁷Be) ¹⁹F, ¹⁶O(¹⁰B, ⁷Li) ¹⁹Ne, and ¹⁶O(¹²C,⁹Be) ¹⁹Ne reactions at high bombarding energies. The Brink approximation to the semiclassical transition amplitude for these reactions was utilized in order to gain a qualitative understanding of the dynamical dependence of the transfer probabilities to various final state spins and parities. The model predictions for the relative cross sections of the known members of the groundstate rotational band in these nuclei were found to be in good agreement with the data. The model was then used to limit the spin-parity assignments for the strong transitions in the data at high excitation energies on the basis of their observed strengths. The structures of these states were predicted using the rotational particle coupling model. The results of these calculations indicate that the high excitation states populated in the above reactions can be explained in terms of high-spin members of K(superscript pi)=1/2⁻ rotational bands having (sd)²(fp)¹ and/or (fp)³ configurations outside the ¹⁶O closed-shell core.