3alpha clustering in the excited states of 16C

Abstract

The alpha cluster states of 16C are investigated by using the antisymmetrized molecular dynamics. It is shown that two different types of alpha cluster states exist: triangular and linear-chain states. The former has an approximate isosceles triangular configuration of alpha particles surrounded by four valence neutrons occupying sd-shell, while the latter has the linearly aligned alpha particles with two sd-shell neutrons and two pf-shell neutrons. It is found that the structure of the linear-chain state is qualitatively understood in terms of the 3/2 pi- and 1/2 sigma- molecular orbit as predicted by molecular-orbital model, but there exists non-negligible Be+alpha+2n correlation. The band-head energies of the triangular and linear-chain rotational bands are 8.0 and 15.5 MeV, and the latter is close to the He+Be threshold energy. It is also shown that the linear-chain state becomes the yrast sstate at J=10 with excitation energy 27.8 MeV owing to its very large moment-of-inertia comparable with hyperdeformation.

7 pages, 5 figures

References in corpus (3)

• Cluster structures of excited states in ${}^{14}$C
• Lifetime measurements of first excited states in 16,18C
• Cluster structures in Oxygen isotopes

Cited by in corpus (10)

• Rod-shaped Nuclei at Extreme Spin and Isospin
• Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei
• Study of ground state properties of carbon isotopes with deformed relativistic Hartree-Bogoliubov theory in continuum
• Positive-parity linear-chain molecular band in ${}^{16}$C
• Dynamics of the linear-chain alpha cluster in microscopic time-dependent relativistic density functional theory
• Alpha-cluster structure in even-even nuclei around ${}^{94}$Mo
• Effects of rotation and valence nucleons in molecular-like $\alpha$-chain nuclei
• Cluster structures and monopole transitions of ${}^{14}$C
• Shape of 13C studied by the real-time evolution method
• Monopole and dipole transitions of the cluster states of 18O