Two-proton capture on the 68Se nucleus with a new self-consistent cluster model

Publication date: 10 July 2018Source: Physics Letters B, Volume 782Author(s): D. Hove, E. Garrido, A.S. Jensen, P. Sarriguren, H.O.U. Fynbo, D.V. Fedorov, N.T. ZinnerAbstractWe investigate the two-proton capture reaction of the prominent rapid proton capture waiting point nucleus, 68Se, that produces the borromean nucleus 70Kr (Se68+p+p). We apply a recently formulated general model where the core nucleus, 68Se, is treated in the mean-field approximation and the three-body problem of the two valence protons and the core is solved exactly. We compare using two popular Skyrme interactions, SLy4 and SkM*. We calculate E2 electromagnetic two-proton dissociation and capture cross sections, and derive the temperature dependent capture rates. We vary the unknown 2+ resonance energy without changing any of the structures computed self-consistently for both core and valence particles. We find rates increasing quickly with temperature below 2–4 GK after which we find rates varying by about a factor of two independent of 2+ resonance energy. The capture mechanism is sequential through the f5/2 proton-core resonance, but the continuum background contributes significantly.

Source: Physics Letters B - July 10, 2018 Category: Physics Source Type: research