States at high excitation in $^{12}\mathrm{C}$ from the $^{12}\mathrm{C}$$(^{3}\mathrm{He},^{3}\mathrm{He})$$3\ensuremath{\alpha}$ reaction

States at high excitation in ${}^{12}C$ from the ${}^{12}C$ $({}^{3}{He}, {}^{3}{He})$ $3 α$ reaction

C. Wheldon, Tz. Kokalova, M. Freer, A. Glenn, D. J. Parker, T. Roberts, and I. Walmsley

Phys. Rev. C 90, 014319 – Published 24 July 2014

Abstract

The high excitation energy region, $E_{x} > 15$ MeV, of ${}^{12}C$ was probed using the ${}^{12}C$ $({}^{3}{He}, {}^{3}{He})$ $3 α$ reaction. The ${}^{3}{He}$ nucleus was detected using a particle identification telescope and was used to reconstruct the excitation energy of ${}^{12}C$ . The $3 α$ decay of ${}^{12}C$ was observed via the detection of two of the three final-state $α$ particles in an array of two double-sided silicon strip detectors. The present analysis selected decays via ${}^{8}{Be}$ $_{gs} + α$ . Evidence is found for a series of states at 16.3(0.2), 17.2(0.2), 18.4(0.2), 19.7(0.2), 22.2(0.3), and 25.1(0.3) MeV.