Complete kinematical study of the 3$\alpha$ breakup of the 16.11 MeV state in ${}^{12}$C

Abstract

The reaction ${}^{11}B+p$ has been used to populate the $(J^{\pi },T)=(2^{+},1)$ state at an excitation energy of 16.11 MeV in ${}^{12}$C, and the breakup of the state into three $\alpha$ particles has been studied in complete kinematics. A two-step breakup model which includes interference effects is found to provide the most accurate description of the experimental data. The branching ratio to the ground state of ${}^8$Be is determined to be 5.1(5)% in agreement with previous findings, but more precise by a factor of two, while the decay to the first-excited state in ${}^8$Be is found to be dominated by $d$-wave emission.

arXiv comment11 pages, 8 figures

References in corpus (4)

• Fusion reactions initiated by laser-accelerated particle beams in a laser-produced plasma
• Unambiguous Identification of the Second 2+ State in 12C and the Structure of the Hoyle State
• Energy distributions from three-body decaying many-body resonances
• Selective population and neutron decay of the first excited state of semi-magic O-23

Cited by in corpus (5)

• Three-body effects in the Hoyle-state decay
• Photoproduction of {\boldmath{${\pi }^0$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region
• The partial widths of the 16.1 MeV 2+ resonance in 12C
• Unbound states in ${}^{12}$C populated by $\gamma$-decay of the $(J^{\pi },T)=(2^{+},1)$ 16.11 MeV state
• Exclusive decay study of the 16.62\,MeV (2${}^{-}$, T=1) resonance in ${}^{12}$C