Theoretical reaction rates of the ¹²C(α,γ)¹⁶O reaction from the potential model

2015/01/26 by Katsuma, M.
#FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Solar and Stellar Astrophysics (astro-ph.SR)

paper · doi:10.48550/arxiv.1501.06250

Abstract

The radiative capture cross sections of ¹²C(α,γ)¹⁶O and derived reaction rates are calculated from the direct capture potential model. The resulting S-factor at low energies is found to be dominated by E2 transition to the ¹⁶O ground state. The E1 and E2 S-factors at E_c.m.=0.3 MeV are S_E1≈3 keV~b and S_E2=150⁺⁴¹_-17 keV~b, respectively. The sum of the cascade transition through the excited state of ¹⁶O is S_{\rm casc}= 18±4.5 keV~b. The derived reaction rates at low temperatures seem to be concordant with those from the previous evaluation. For astrophysical applications, our reaction rates below T₉=3 are provided in an analytic expression.

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