Cluster states and monopole transitions in ${}^{16}$O

Abstract

Cluster structures and monopole transitions in positive parity states of ${}^{16}$O were investigated based on the generator coordinate method calculation of an extended ${}^{12}$C+$\alpha$ cluster model. The ground and excited states of a ${}^{12}$C cluster are taken into account by using ${}^{12}$C wave functions obtained with the method of antisymmetrized molecular dynamics. The $0_2^{+}$ state of ${}^{16}$O and its rotational members, the $2_1^{+}$ and $4_1^{+}$ states are described well by the cluster states dominated by the ${}^{12}$C($0_1^{+}$)+$\alpha$ structure. Above the ${}^{12}$C($0_2^{+}$)+$\alpha$ threshold energy, we obtained a $0^{+}$ state having the ${}^{12}$C($0_2^{+}$)+$\alpha$ cluster structure, which is considered to be a candidate for the $4\alpha$ cluster gas state. The band structures were discussed based on the calculated $E2$ transition strength. Isoscalar Monopole excitations from the ground state were also discussed.

15 pages, 9 figures

References in corpus (6)

• Alpha-particle condensation in 16O via a full four-body OCM calculation
• Negative parity states of ${}^{11}$B and ${}^{11}$C and the similarity with $^{12}C
• Evidence for an alpha cluster condensed state in 16O(alpha,alpha') at 400 MeV
• Second RPA and correlated realistic interactions
• $\alpha +\alpha +t$ cluster structures and Hoyle-analogue states in ${}^{11}$B
• Dineutron structure in ${}^8$He

Cited by in corpus (20)

• Microscopic Clustering in Light Nuclei
• Status of Alpha-Particle Condensate Structure of the Hoyle State
• Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei
• Hoyle band and $\alpha$ condensation in ${}^{12}\mathrm{C}$
• Alpha particle clusters and their condensation in nuclear systems
• Isoscalar dipole transition as a probe for asymmetric clustering
• Alpha cluster structures and monopole excitations in ${}^{13}$C
• Searching for 4$\alpha$ linear-chain structure in excited states of ${}^{16}$O with a covariant density functional theory
• Isoscalar monopole and dipole excitations of cluster states and giant resonances in ${}^{12}$C
• Isovector and isoscalar dipole excitations in ${}^9$Be and ${}^{10}$Be studied with antisymmetrized molecular dynamics
• Toroidal, compressive, and $E1$ properties of low-energy dipole modes in ${}^{10}$Be
• Structure and decay of the pygmy dipole resonance in 26Ne
• Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems
• Tetrahedral $4\alpha$ and ${}^{12}\text{C}+\alpha$ cluster structures in ${}^{16}$O
• Isoscalar dipole excitations in ${}^{16}$O
• Cluster and toroidal aspects of isoscalar dipole excitations in ${}^{12}$C
• Investigation of spatial manifestation of $\alpha$ clusters in ${}^{16}$O via $\alpha$-transfer reactions
• First microscopic coupled-channel calculation of $\alpha$ inelastic cross sections on ${}^{16}$O
• Monopole and dipole transitions of the cluster states of 18O
• alpha+28Si and 16O+16O molecular states, and their isoscalar monopole strengths