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Our understanding of the low-lying resonance structure in $^{12}$C remainsincomplete. We have used the $^{11}\text{B}(p,3\alpha)\gamma$ reaction atproton energies of $E_p=0.5-2.7$ MeV as a selective probe of the excitationregion above the $3\alpha$ threshold in $^{12}$C. Transitions to individuallevels in $^{12}$C were identified by measuring the 3$\alpha$ final state witha compact array of charged-particle detectors. Previously identifiedtransitions to narrow levels were confirmed and new transitions to broaderlevels were observed for the first time. Here, we report cross sections, deducepartial $\gamma$-decay widths and discuss the relative importance of direct andresonant capture mechanisms.

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