dorsal/arxiv
View SchemaDetermination of S17 from 8B breakup by means of the method of continuum-discretized coupled-channels
| Authors | K. Ogata, S. Hashimoto, Y. Iseri, M. Kamimura, M. Yahiro |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0505007 |
| URL | https://arxiv.org/abs/nucl-th/0505007 |
| DOI | 10.1103/PhysRevC.73.024605 |
| Journal | Phys.Rev. C73 (2006) 024605 |
Abstract
The astrophysical factor for 7Be(p,\gamma)8B at zero energy, S17(0), is determined from an analysis of 208Pb(8B, p+7Be)208Pb at 52 MeV/nucleon by means of the method of continuum-discretized coupled-channels (CDCC) taking account of all nuclear and Coulomb breakup processes. The asymptotic normalization coefficient (ANC) method is used to extract S17(0) from the calculated breakup-cross-section. The main result of the present paper is S17(0)=20.9 +2.0/-1.9 eV b. The error consists of 8.4% experimental systematic error and the error due to the ambiguity in the s-wave p-7Be scattering length. This value of S17(0) differs from the one extracted with the first-order perturbation theory including Coulomb breakup by dipole transitions: 18.9 +/- 1.8 eV b. It turns out that the difference is due to the inclusion of the nuclear and Coulomb-quadrupole transitions and multi-step processes of all-order in the present work. The p-7Be interaction potential used in the CDCC calculation is also used in the ANC analysis of 7Be(p,\gamma)8B. The value of S17(0)=21.7 +0.62/-0.55 eV b obtained is consistent with the previous one obtained from a precise measurement of the p-capture reaction cross section extrapolated to zero incident energy, S17(0)=22.1 +/- 0.6 (expt) +/- 0.6 (theo) eV b, where (theo) stands for the error in the extrapolation. Thus, the agreement between the values of S17(0) obtained from direct 7Be(p,\gamma)8B and indirect 8B-breakup measurements is significantly improved.
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"abstract": "The astrophysical factor for 7Be(p,\\gamma)8B at zero energy, S17(0), is\ndetermined from an analysis of 208Pb(8B, p+7Be)208Pb at 52 MeV/nucleon by means\nof the method of continuum-discretized coupled-channels (CDCC) taking account\nof all nuclear and Coulomb breakup processes. The asymptotic normalization\ncoefficient (ANC) method is used to extract S17(0) from the calculated\nbreakup-cross-section. The main result of the present paper is S17(0)=20.9\n+2.0/-1.9 eV b. The error consists of 8.4% experimental systematic error and\nthe error due to the ambiguity in the s-wave p-7Be scattering length. This\nvalue of S17(0) differs from the one extracted with the first-order\nperturbation theory including Coulomb breakup by dipole transitions: 18.9 +/-\n1.8 eV b. It turns out that the difference is due to the inclusion of the\nnuclear and Coulomb-quadrupole transitions and multi-step processes of\nall-order in the present work. The p-7Be interaction potential used in the CDCC\ncalculation is also used in the ANC analysis of 7Be(p,\\gamma)8B. The value of\nS17(0)=21.7 +0.62/-0.55 eV b obtained is consistent with the previous one\nobtained from a precise measurement of the p-capture reaction cross section\nextrapolated to zero incident energy, S17(0)=22.1 +/- 0.6 (expt) +/- 0.6 (theo)\neV b, where (theo) stands for the error in the extrapolation. Thus, the\nagreement between the values of S17(0) obtained from direct 7Be(p,\\gamma)8B and\nindirect 8B-breakup measurements is significantly improved.",
"arxiv_id": "nucl-th/0505007",
"authors": [
"K. Ogata",
"S. Hashimoto",
"Y. Iseri",
"M. Kamimura",
"M. Yahiro"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.73.024605",
"journal_ref": "Phys.Rev. C73 (2006) 024605",
"title": "Determination of S17 from 8B breakup by means of the method of continuum-discretized coupled-channels",
"url": "https://arxiv.org/abs/nucl-th/0505007"
},
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