dorsal/arxiv
View SchemaDetermination of S17(0) from published data
| Authors | R. H. Cyburt, B. Davids, B. K. Jennings |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0406011 |
| URL | https://arxiv.org/abs/nucl-th/0406011 |
| DOI | 10.1103/PhysRevC.70.045801 |
| Journal | Phys.Rev. C70 (2004) 045801 |
Abstract
The experimental landscape for the 7Be+p radiative capture reaction is rapidly changing as new high precision data become available. We present an evaluation of existing data, detailing the treatment of systematic errors and discrepancies, and show how they constrain the astrophysical S factor (S17), independent of any nuclear structure model. With theoretical models robustly determining the behavior of the sub-threshold pole, the extrapolation error can be reduced and a constraint placed on the slope of S17. Using only radiative capture data, we find S17(0) = 20.7 +/- 0.6 (stat) +/- 1.0 (syst) eV b if data sets are completely independent, while if data sets are completely correlated we find S17(0) = 21.4 +/- 0.5 (stat) +/- 1.4 (syst) eV b. The truth likely lies somewhere in between these two limits. Although we employ a formalism capable of treating discrepant data, we note that the central value of the S factor is dominated by the recent high precision data of Junghans et al., which imply a substantially higher value than other radiative capture and indirect measurements. Therefore we conclude that further progress will require new high precision data with a detailed error budget.
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"abstract": "The experimental landscape for the 7Be+p radiative capture reaction is\nrapidly changing as new high precision data become available. We present an\nevaluation of existing data, detailing the treatment of systematic errors and\ndiscrepancies, and show how they constrain the astrophysical S factor (S17),\nindependent of any nuclear structure model. With theoretical models robustly\ndetermining the behavior of the sub-threshold pole, the extrapolation error can\nbe reduced and a constraint placed on the slope of S17. Using only radiative\ncapture data, we find S17(0) = 20.7 +/- 0.6 (stat) +/- 1.0 (syst) eV b if data\nsets are completely independent, while if data sets are completely correlated\nwe find S17(0) = 21.4 +/- 0.5 (stat) +/- 1.4 (syst) eV b. The truth likely lies\nsomewhere in between these two limits. Although we employ a formalism capable\nof treating discrepant data, we note that the central value of the S factor is\ndominated by the recent high precision data of Junghans et al., which imply a\nsubstantially higher value than other radiative capture and indirect\nmeasurements. Therefore we conclude that further progress will require new high\nprecision data with a detailed error budget.",
"arxiv_id": "nucl-th/0406011",
"authors": [
"R. H. Cyburt",
"B. Davids",
"B. K. Jennings"
],
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"nucl-th",
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],
"doi": "10.1103/PhysRevC.70.045801",
"journal_ref": "Phys.Rev. C70 (2004) 045801",
"title": "Determination of S17(0) from published data",
"url": "https://arxiv.org/abs/nucl-th/0406011"
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