Direct observation of the decay of first excited Hoyle state in ${}^{12}$C

T. K. Rana, S. Bhattacharya, C. Bhattacharya +12

An excited state of ${}^{12}$C having excitation energy E${}_x\sim$ 9.65 $\pm$ 0.02 MeV and width (FWHM) $\sim 607\pm$ 55 keV, which decays to three $\alpha$-particles via Hoyle state ($E_…