Coulomb Displacement Energy and the Low - Energy Astrophysical S 17 Factor for the 7 Be ( p , γ ) 8 B Reaction
نویسندگان
چکیده
The relationship between the Coulomb displacement energy for the A=8, J=2 + , T=1 state and the low-energy astrophysical S 17 factor for the 7 Be(p,γ) 8 B reaction is discussed. The displacement energy is interpreted in a particle-hole model. The dependence of the particle displacement energy on the potential well geometry is investigated and is used to relate the particle displacement energy to the rms radius and the asymptotic normalization of the valence proton wave function in 8 B. The asymptotic normalization is used to calculate the astrophysical S 17 factor for the 7 Be(p,γ) reaction. The relationship to the 7 Li(n,γ) reaction, the 8 B quadrupole moment, radial density, and break-up momentum distribution are also discussed.
منابع مشابه
Preprint CNP - 95 / 18 Astrophysical S - factor of the 7 Be ( p , γ ) 8 B reaction from Coulomb dissociation of 8 B ∗
The Coulomb dissociation method to obtain the astrophysical S-factor, S 17 (0), for the 7 Be(p, γ) 8 B reaction at solar energies is investigated by analysing the recently measured data on the breakup reaction 208 Pb(8 B, 7 Be p) 208 Pb at 46.5 MeV/A beam energy. Breakup cross sections corresponding to E1, E2 and M 1 transitions are calculated with a theory of Coulomb excitation that includes t...
متن کاملEffects of 8 B size on the low - energy 7 Be ( p , γ ) 8 B cross section
We calculate several “size-like” B observables within the microscopic threecluster model and study their potential constraints on the zero-energy astrophysical S17(0) factor of the Be(p, γ)B reaction. We find within our threecluster model that a simultaneous reproduction of the experimental data for the B radius and quadrupole moment and of the B-Li Coulomb displacement energy implies S17(0) = ...
متن کامل0 Low Energy Behavior of the 7 Be ( p , γ ) 8 B reaction
Three related features of the astrophysical S-factor, S 17 , for low energies are an upturn as the energy of the proton goes to zero, a pole at the proton separation energy and a long-ranged radial integral peaking at approximately 40 fm. These features, particularly the last, mean S 17 at threshold is largely determined by the asymptotic normalization of the proton bound-state wave function. I...
متن کامل9 Low Energy Behavior of the 7 Be ( p , γ ) 8 B reaction
Three related features of the astrophysical S-factor, S 17 , for low energies are an upturn as the energy of the proton goes to zero, a pole at the proton separation energy and a long ranged radial integral peaking at approximately 40 fm. These features, particularly the last, mean S 17 at threshold is largely determined by the asymptotic normalization of the proton bound-state wave function. I...
متن کاملTypeset Using Revt E X
The 7 Be(p, γ) 8 B cross section and the properties of 7 Be Abstract We study the nonresonant part of the 7 Be(p, γ) 8 B reaction using a three-cluster resonating group model that is variationally converged and virtually complete in the 4 He+ 3 He+p model space. The importance of using adequate nucleon-nucleon interaction is demonstrated. We find that the low-energy astrophysical S-factor is li...
متن کامل