Experimental study of the $^{11}\text{B}(p,3α)γ$ reaction at $E_p = 0.5-2.7$ MeV

Our understanding of the low-lying resonance structure in $^{12}$C remains incomplete. We have used the $^{11}\text{B}(p,3α)γ$ reaction at proton energies of $E_p=0.5-2.7$ MeV as a selective probe of the excitation region above the $3α$ threshold in $^{12}$C. Transitions to individual levels in $^{12}$C were identified by measuring the 3$α$ final state with a compact array of charged-particle detectors. Previously identified transitions to narrow levels were confirmed and new transitions to broader levels were observed for the first time. Here, we report cross sections, deduce partial $γ$-decay widths and discuss the relative importance of direct and resonant capture mechanisms.

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