Unbound states in ${}^{12}$C populated by $\gamma$-decay of the $(J^{\pi },T)=(2^{+},1)$ 16.11 MeV state

Abstract

The reaction ${}^{11}\text{B}+p$ has been used to populate the $(J^{\pi },T)=(2^{+},1)$ state at an excitation energy of 16.11 MeV in ${}^{12}$C. $\gamma$-decay to unbound states in ${}^{12}$C are identified from analysis of the decay of the populated daughter states. Due to a new technique, $\gamma$-decay to the 10.8 MeV 1${}^{-}$ state is observed for the first time, and transitions to the 9.64 MeV (3${}^{-}$) and 12.71 MeV (1${}^{+}$) are confirmed. Unresolved transitions to natural parity strength at 10 MeV and 11.5-13 MeV are also observed. For all transitions partial widths are deduced

arXiv commentCorrected small typographical errors and added more details on data analysis

References in corpus (7)

• Quantum Monte Carlo calculations of A=8 nuclei
• Evidence for Triangular D_3h Symmetry in 12C
• Unambiguous Identification of the Second 2+ State in 12C and the Structure of the Hoyle State
• Cluster states in nuclei as representations of a U(n+1) group
• Direct observation of 4+ to 2+ gamma transition in 8Be
• No evidence of an 11.16 MeV 2+ state in 12C
• Complete kinematical study of the 3$\alpha$ breakup of the 16.11 MeV state in ${}^{12}$C

Cited by in corpus (2)

• The partial widths of the 16.1 MeV 2+ resonance in 12C
• Experimental study of the ${}^{11}\text{B}(p,3\alpha )\gamma$ reaction at $E_p=0.5-2.7$ MeV