An experiment using the 11B(3He,d)12C reaction was performed at iThemba LABS at an incident energy of 44 MeV and analyzed with a high energy-resolution magnetic spectrometer, to re-investigate states in 12C published in 1971. The original investigation reported the existence of an 11.16 MeV state in 12C that displays a 2+ nature. In the present experiment data were acquired at laboratory angles of 25-, 30- and 35- degrees, to be as close to the c.m. angles of the original measurements where the clearest signature of such a state was observed. These new low background measurements revealed no evidence of the previously reported state at 11.16 MeV in 12C.
@article{arxiv.1206.4217,
title = {No evidence of an 11.16 MeV 2+ state in 12C},
author = {F. D. Smit and F. Nemulodi and Z. Buthelezi and J. Carter and R. F. Fearick and S. V. Foertsch and M. Freer and H. Fujita and M. Jingo and C. O. Kureba and J. Mabiala and J. Mira and R. Neveling and P. Papka and G. F. Steyn and J. A. Swartz and I. T. Usman and J. J. van Zyl},
journal= {arXiv preprint arXiv:1206.4217},
year = {2015}
}