The neutron inelastic scattering of carbon-12, populating the Hoyle state, is a reaction of interest for the triple-alpha process. The inverse process (neutron upscattering) can enhance the Hoyle state’s decay rate to the bound states of12C, effectively increasing the overall triple-alpha reaction rate. The cross section of this reaction is impossible to measure experimentally but has been determined here at astrophysically-relevant energies using detailed balance. Using a highly-collimated monoenergetic beam, here we measure neutrons incident on the Texas Active Target Time Projection Chamber (TexAT TPC) filled with CO2gas, we measure the 3
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Abstract α -particles (arising from the decay of the Hoyle state following inelastic scattering) and a cross section is extracted. Here we show the neutron-upscattering enhancement is observed to be much smaller than previously expected. The importance of the neutron-upscattering enhancement may therefore not be significant aside from in very particular astrophysical sites (e.g. neutron star mergers). -
Paul, N. ; Obertelli, A. ; Bertulani, C. A. ; Corsi, A. ; Doornenbal, P. ; Rodriguez-Sanchez, J. L. ; Authelet, G. ; Baba, H. ; Calvet, D. ; Château, F. ; et al ( , Physical Review Letters)
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Fernández-Domínguez, B. ; Thomas, J. S. ; Catford, W. N. ; Delaunay, F. ; Brown, S. M. ; Orr, N. A. ; Rejmund, M. ; Labiche, M. ; Chartier, M. ; Achouri, N. L. ; et al ( , Physical Review C)