The Astrophysical Journal
The American Astronomical Society
We investigate the possibility that in the astrophysically interesting energy range (i.e., well below the Coulomb barrier), the reaction 3He(3He,2p)4He proceeds predominantly by a neutron tunneling mechanism. Rough calculations of the magnitude and energy dependence of the total cross-section and of the shape of the proton differential cross-section are made on this basis. The results are in moderate agreement with recent experiments, and tend to justify a smooth extrapolation of these laboratory results down to the lower energies of astrophysical significance.
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