Proton skin of 8B in a microscopic model

Effects of 8B size on the low-energy 7Be(p,γ)8B cross section

“…As this model has been discussed before we refer the reader to Refs. [10,9] for details of the theoretical background. As customary in nuclear astrophysics we define the cross sections in terms of the astrophysical S factor…”

Be7(p,γ)8Csótó1, Langanke2, Koonin3 et al. 1995Phys. Rev. C463650View full textAdd to dashboardCite

“…To this end, we study the 7 Be(p, γ) 8 B reaction in a microscopic three-cluster ( 4 He+ 3 He+p) approach. This model is currently the closest approximation to a full solution of the microscopic eight-nucleon problem with a consistent treatment of bound and scattering states.…”

“…Thus, knowledge of S 17 , the 7 Be(p, γ) 8 B S-factor at solar energies (center-of-mass energy E ≈ 20 keV), is crucial to conclusions drawn from present (Homestake, Kamiokande) and future (SNO, Superkamiokande) solar neutrino experiments [1,2]. Despite extensive experimental efforts, the 7 Be(p, γ) 8 B cross section is still the most uncertain nuclear input to the standard solar model [1,3], due to a significant spread among the values of S 17 deduced from the various experiments (direct capture [4]: S 17 = 18 − 28 eV·b and Coulomb break-up [5]: S 17 = 16.7 ± 3.5 eV·b). Theoretical estimates also vary (S 17 = 16 − 30 eV·b) [6], making these predictions rather unreliable.…”

Direct Breakup Rections Of 8B At Fermi Energy

“…Many neutron-halo nuclei are discovered, such as 6 He, 11 Li, 11 Be, 14 Be 17 B, 19 C and only three proton-halo nuclei are experimentally observed, namely 8 B, 12 N and 17 Ne [1,2]. A typical characteristic of halo structure is one or more valence nucleons surrounding a tightly bound core nucleus very extensively due to the loosely bound of the valence nucleons [3].…”

“…[18]. However it could be partly contributed by the very distortable 7 Be core [19]. There are also many experiments performed to measure the longitudinal momentum distributions with the energy from several tens MeV/u to several GeV/u [17,[20][21][22][23].…”