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

Csótó, Attila; Langanke, K.

doi:10.1016/s0375-9474(98)00200-0

Cited by 13 publications

(4 citation statements)

References 28 publications

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“…The present wave functions perform more poorly than previous VMC wave functions on the ordering of the mass-seven bound states (a perennial difficulty for both VMC and GFMC because of the close spacing of the states), but they give larger asymptotic normalizations at a reasonable cost in binding energy. The relationship between nuclear size (as measured by quadrupole moments) and cross sections for direct radiative captures has been noticed before, and applied usefully both to these [14] and other reactions, most notably 7 Be(p, γ) 8 B [33]. We note that our S(0) and quadrupole moments for both mass-seven systems fit the general trends shown in Ref.…”

Section: Ls[n] Psupporting

confidence: 79%

Radiativeα-capture cross sections from realistic nucleon-nucleon interactions and variational Monte Carlo wave functions

Nollett

2001

Phys. Rev. C

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We report the first calculations of cross sections for the radiative capture reactions 3 H(α, γ) 7 Li and 3 He(α, γ) 7 Be below 2 MeV which use wave functions derived from realistic nucleon-nucleon interactions by the variational Monte Carlo technique. After examining several small corrections to the dominant E1 operator, we find energy dependences for the low-energy S-factors which agree reasonably with experimental measurements. There is no contradiction with the previous theoretical understanding of these processes, but the zero-energy derivative of the 3 H(α, γ) 7 Li S-factor is smaller than in most models. While this method can in principle predict cross section normalizations, the normalizations of our results are mostly too low.

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Section: Ls[n] Psupporting

confidence: 79%

Radiativeα-capture cross sections from realistic nucleon-nucleon interactions and variational Monte Carlo wave functions

Nollett

2001

Phys. Rev. C

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“…The proton capture rate in 7 Be strongly depends on the 8 B structure. The size of 8 B and the shape of the proton density distribution at large distances determine the proton capture rate and may be used in theoretical calculations of the solar neutrino flux [40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Nuclear-matter distribution in the proton-rich nuclei 7Be and 8B from intermediate energy proton elastic scattering in inverse kinematics

et al. 2019

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Absolute differential cross sections for elastic p 7 Be and p 8 B small-angle scattering were measured in inverse kinematics at an energy of 0.7 GeV/u at GSI Darmstadt. The hydrogen-filled ionization chamber IKAR was used as an active target to detect the recoil protons. The projectile tracking and isotope identification were performed with multi-wire proportional chambers and scintillation detectors. The measured cross sections were analysed using the Glauber multiple-scattering theory. The root-mean-square (rms) nuclear matter radii R m = 2.42(4) fm for 7 Be and R m = 2.58(6) fm for 8 B were obtained. The radial density distribution deduced for 8 B exhibits a proton halo structure with the rms halo radius R h = 4.24(25) fm. A comparison of the deduced experimental radii is displayed with existing experimental and theoretical data.

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“…Theoretical studies of the low-energy behavior of the astrophysical S 17 -factor has been presented by many authors, see e.g. [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Radiative capture and electromagnetic dissociation involving loosely bound nuclei: The8Bexample

2003

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Electromagnetic processes in loosely bound nuclei are investigated using an analytical model. In particular, electromagnetic dissociation of 8 B is studied and the results of our analytical model are compared to numerical calculations based on a three-body picture of the 8 B bound state. The calculation of energy spectra is shown to be strongly model dependent. This is demonstrated by investigating the sensitivity to the rms intercluster distance, the few-body behavior, and the effects of final state interaction. In contrast, the fraction of the energy spectrum which can be attributed to E1 transitions is found to be almost model independent at small relative energies. This finding is of great importance for astrophysical applications as it provides us with a new tool to extract the E1 component from measured energy spectra. An additional, and independent, method is also proposed as it is demonstrated how two sets of experimental data, obtained with different beam energy and/or minimum impact parameter, can be used to extract the E1 component.

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

Cited by 13 publications

References 28 publications

Radiativeα-capture cross sections from realistic nucleon-nucleon interactions and variational Monte Carlo wave functions

Radiativeα-capture cross sections from realistic nucleon-nucleon interactions and variational Monte Carlo wave functions

Nuclear-matter distribution in the proton-rich nuclei 7Be and 8B from intermediate energy proton elastic scattering in inverse kinematics

Radiative capture and electromagnetic dissociation involving loosely bound nuclei: The8Bexample

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