$\alpha$-cluster structure of ${}^{18}$O

Abstract

Background: Clustering phenomena in $N\ne Z$ nuclei provide an opportunity to understand the interplay between cluster and nucleon degrees of freedom. Purpose:To study resonances in the ${}^{18}$O spectrum, populated in ${}^{14}$C+$\alpha$ elastic scattering. Method: The Thick Target Inverse Kinematics (TTIK) technique was used to measure the excitation function for the ${}^{14}$C+$\alpha$ elastic scattering. A 42 MeV ${}^{14}$C beam was used to populate states of excitation energy up to 14.9 MeV in ${}^{18}$O. The analysis was performed using a multi-level, multi-channel R-Matrix approach. Results: Detailed spectroscopic information, including spin-parities, partial $\alpha$- and neutron- decay widths and dimensionless reduced widths, was obtained for excited states in ${}^{18}$O between 8 and 14.9 MeV in excitation energy. Cluster-Nucleon Configuration Interaction Model calculations of the same quantities are performed and compared to the experimental results. Conclusions: Strong fragmentation of large $\alpha$-cluster strengths is observed in the spectrum of ${}^{18}$O making the $\alpha$-cluster structure of ${}^{18}$O quite different from the pattern of known quasi-rotational bands of alternating parity that are characteristic of $N=Z$, even-even nuclei like ${}^{16}$O and ${}^{20}$Ne.

References in corpus (2)

• Ab initio no-core full configuration calculations of light nuclei
• Cluster structures in Oxygen isotopes

Cited by in corpus (4)

• Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei
• Alpha clustering in ${}^{28}$Si probed through the identification of high-lying $0^{+}$ states
• A variety of clustering in ${}^{18}$O
• Monopole and dipole transitions of the cluster states of 18O