dorsal/arxiv
View SchemaAstrophysical S-factor of the $^7$Be($p,\gamma)^8$B reaction from Coulomb dissociation of $^8$B
| Authors | R. Shyam, I. J. Thompson, A. K. Dutt-Mazumder |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9601039 |
| URL | https://arxiv.org/abs/nucl-th/9601039 |
| DOI | 10.1016/0370-2693(95)01591-4 |
| Journal | Phys.Lett. B371 (1996) 1-6 |
Abstract
The Coulomb dissociation method to obtain the astrophysical S-factor, $S_{17}(0)$, for the $^7$Be($p,\gamma)^8$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 $M1$ transitions are calculated with a theory of Coulomb excitation that includes the effects of the Coulomb recoil as well as relativistic retardation. The interplay of nuclear and Coulomb contributions to the breakup process is studied by performing a full quantum mechanical calculation within the framework of the distorted-wave Born Approximation. In the kinematical regime of the present experiment, both nuclear as well as Coulomb-nuclear interference processes affect the pure Coulomb breakup cross sections very marginally. The $E2$ cross sections are strongly dependent on the model used to describe the structure of $^8$B. The value of $S_{17}(0)$ is deduced with and without $E2$ and $M1$ contributions added to the $E1$ cross sections and the results are discussed.
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"abstract": "The Coulomb dissociation method to obtain the astrophysical S-factor,\n$S_{17}(0)$, for the $^7$Be($p,\\gamma)^8$B reaction at solar energies is\ninvestigated by analysing the recently measured data on the breakup reaction\n$^{208}$Pb$(^8$B,$^7$Be$~p)^{208}$Pb at 46.5 MeV/A beam energy. Breakup cross\nsections corresponding to E1, $E2$ and $M1$ transitions are calculated with a\ntheory of Coulomb excitation that includes the effects of the Coulomb recoil as\nwell as relativistic retardation. The interplay of nuclear and Coulomb\ncontributions to the breakup process is studied by performing a full quantum\nmechanical calculation within the framework of the distorted-wave Born\nApproximation. In the kinematical regime of the present experiment, both\nnuclear as well as Coulomb-nuclear interference processes affect the pure\nCoulomb breakup cross sections very marginally. The $E2$ cross sections are\nstrongly dependent on the model used to describe the structure of $^8$B. The\nvalue of $S_{17}(0)$ is deduced with and without $E2$ and $M1$ contributions\nadded to the $E1$ cross sections and the results are discussed.",
"arxiv_id": "nucl-th/9601039",
"authors": [
"R. Shyam",
"I. J. Thompson",
"A. K. Dutt-Mazumder"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/0370-2693(95)01591-4",
"journal_ref": "Phys.Lett. B371 (1996) 1-6",
"title": "Astrophysical S-factor of the $^7$Be($p,\\gamma)^8$B reaction from Coulomb dissociation of $^8$B",
"url": "https://arxiv.org/abs/nucl-th/9601039"
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