No evidence of an 11.16 MeV 2+ state in 12C
F. D. Smit, F. Nemulodi, Z. Buthelezi, J. Carter, R. F. Fearick, S. V., Foertsch, M. Freer, H. Fujita, M. Jingo, C. O. Kureba, J. Mabiala, J. Mira,, R. Neveling, P. Papka, G. F. Steyn, J. A. Swartz, I. T. Usman, and J. J. van, Zyl
TL;DR
This study used high-resolution spectroscopy to re-examine a claimed 2+ state in 12C at 11.16 MeV, but found no evidence supporting its existence, challenging previous findings from 1971.
Contribution
The paper provides new high-resolution experimental data that refutes the existence of the previously reported 11.16 MeV 2+ state in 12C.
Findings
No evidence of the 11.16 MeV 2+ state in 12C was observed.
High-resolution measurements showed no signal at the claimed energy.
Results contradict earlier reports from 1971.
Abstract
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.
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