Radiative capture and electromagnetic dissociation involving loosely bound nuclei: the ${}^8$B example

Abstract

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.

Submitted to Phys. Rev. C. 10 pages, 7 figures

References in corpus (10)

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• Low energy measurement of the 7Be(p,gamma)8B cross section
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Cited by in corpus (12)

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• Electromagnetic dissociation of 8B and the astrophysical S factor for 7Be(p,gamma)8B
• Astrophysical reaction rate for ${}^9$Be formation within a three-body approach
• Relative production rates of ${}^6$He, ${}^9$Be, ${}^{12}$C in astrophysical environments
• Analytical transformed harmonic oscillator basis for three-body nuclei of astrophysical interest: Application to 6He
• Radiative capture reaction for ${}^{17}$Ne formation within a full three-body model
• Techniques to treat the continuum applied to electromagnetictransitions in ${}^8$Be
• Three-body bremsstrahlung and the rotational character of the 12C-spectrum
• Inelastic cross sections and continuum transitions illustrated by ${}^8$Be results
• Determining astrophysical three-body radiative capture reaction rates from inclusive Coulomb break-up measurements
• Description of continuum structures in a discrete basis: Three-body resonances and two-nucleon decays
• Three-body radiative capture reactions