Regular Article - Experimental Physics
Resolution of a long-standing discrepancy in the OC fusion excitation function
Department of Physics, Florida State University, Tallahassee, 32306, Florida, USA
2 National Centre for Nuclear Research, ul. Andrzeja Sołtana 7, 05-400, Otwock, Poland
Accepted: 27 August 2021
Published online: 13 September 2021
There has been a long-standing discrepancy between existing measurements of the total fusion cross section for the O C system at MeV. In order to resolve this inconsistency, the cross section was measured in two overlapping energy ranges using an O beam and the Encore active target detector at Florida State University. Encore is a self-normalizing detector that measures a large portion of the fusion excitation function with a single beam energy. It also provides full angular coverage of the measured evaporation residues, thus ensuring a model independent measurement of the total fusion cross section. The data reported here show an oscillatory structure not previously observed in this system and agree with all previously reported measurements, resolving the long-standing discrepancy. Coupled reaction channels calculations reproduce the data except in the region of the the oscillation, which matches a similar structure seen in the O C total fusion excitation function.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021