s-wave scattering lengths for the Be-7 + p system from an R-matrix analysis

Paneru S. N.; Brune C. R.; Giri R.; Livesay R. J.; Greife U.; Blackmon J. C.; Bardayan D. W.; Chipps K. A.; Davids B.; Connolly D. S.; Chae K. Y.; Champagne A. E.; Deibel C.; Jones L.; Johnson M. S.; Kozub R. L.; Ma Z.; Nesaraja C. D.; Pain S. D.; Sarazin F.; Shriner J. F. Jr.; Stracener D. W.; Smith M. S.; Thomas J. S.; Visser D. W.; Wrede C.

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s-wave scattering lengths for the Be-7 + p system from an R-matrix analysis

机译：来自R-Matrix分析的BE-7 + P系统的S波散射长度

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The astrophysical S factor for the radiative proton capture reaction on Be-7 (S-17) at low energies is affected by the s-wave scattering lengths. We report the measurement of elastic and inelastic scattering cross sections for the Be-7 + p system in the center-of-mass energy range 0.474-2.740 MeV and center-of-mass angular range 70 degrees-150 degrees. A radioactive Be-7 beam produced at Oak Ridge National Laboratory's (ORNL) Holifield Radioactive Ion Beam Facility was accelerated and bombarded a thin polypropylene (CH2)(n) target. Scattered ions were detected in the segmented Silicon Detector Array. Using an R-matrix analysis of ORNL and Louvain-la-Neuve cross-section data, the s-wave scattering lengths for channel spins 1 and 2 were determined to be 17.341(-1.33)(+1.11) and -3.18(-0.5)(0)(+0.55) fm, respectively. The uncertainty in the s-wave scattering lengths reported in this work is smaller by a factor of 5-8 compared to the previous measurement, which may reduce the overall uncertainty in S-17 at zero energy. The level structure of B-8 is discussed based upon the results from this work. Evidence for the existence of 0(+) and 2(+) levels in B-8 at 1.9 and 2.21 MeV, respectively, is observed.

机译：在低能量下为BE-7（S-17）的辐射质子捕获反应的天体物理S因子受S波散射长度的影响。我们报告了在质量中心能量范围内为0.474-2.740 MeV和质量中心范围70度-150度的EA-7 + P系统的弹性和非弹性散射横截面的测量。在橡木岭国家实验室（ORNL）Holifield放射性离子束设施中产生的放射性BE-7光束加速，轰炸了薄的聚丙烯（CH2）（N）靶标。在分段的硅探测器阵列中检测到散射离子。使用ORNL和Louvain-La-Neuve横截面数据的R矩阵分析，确定通道旋转1和2的S波散射长度为17.341（-1.33）（+ 1.11）和-3.18（-0.5 ）（0）（+ 0.55）FM。与先前的测量相比，在该工作中报告的S波散射长度中的不确定性比以前的测量相比较小为5-8，这可以减少零能量的S-17中的总不确定性。基于这项工作的结果讨论B-8的水平结构。观察到在1.9和2.21MeV的B-8中存在0（+）和2（+）水平的证据。

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《Physical review, C》 |2019年第4期|共9页
作者
Paneru S. N.; Brune C. R.; Giri R.; Livesay R. J.; Greife U.; Blackmon J. C.; Bardayan D. W.; Chipps K. A.; Davids B.; Connolly D. S.; Chae K. Y.; Champagne A. E.; Deibel C.; Jones L.; Johnson M. S.; Kozub R. L.; Ma Z.; Nesaraja C. D.; Pain S. D.; Sarazin F.; Shriner J. F. Jr.; Stracener D. W.; Smith M. S.; Thomas J. S.; Visser D. W.; Wrede C.;
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作者单位

Ohio Univ Dept Phys &

Astron Athens OH 45701 USA;

Ohio Univ Dept Phys &

Astron Athens OH 45701 USA;

Ohio Univ Dept Phys &

Astron Athens OH 45701 USA;

Colorado Sch Mines Dept Phys Golden CO 80401 USA;

Colorado Sch Mines Dept Phys Golden CO 80401 USA;

Louisiana State Univ Dept Phys &

Astron Baton Rouge LA 70803 USA;

Univ Notre Dame Dept Phys Notre Dame IN 46556 USA;

Oak Ridge Natl Lab Div Phys Oak Ridge TN 37831 USA;

TRIUMF Vancouver BC V6T 2A3 Canada;

TRIUMF Vancouver BC V6T 2A3 Canada;

Sungkyunkwan Univ Dept Phys Suwon 16419 South Korea;

Univ N Carolina Dept Phys &

Astron Chapel Hill NC 27599 USA;

Yale Univ Wright Nucl Struct Lab New Haven CT 06520 USA;

Univ Tennessee Dept Phys &

Astron Knoxville TN 37996 USA;

Rutgers State Univ Dept Phys &

Astron Piscataway NJ 08854 USA;

Tennessee Technol Univ Dept Phys Cookeville TN 38505 USA;

Univ Tennessee Dept Phys &

Astron Knoxville TN 37996 USA;

Oak Ridge Natl Lab Div Phys Oak Ridge TN 37831 USA;

Rutgers State Univ Dept Phys &

Astron Piscataway NJ 08854 USA;

Colorado Sch Mines Dept Phys Golden CO 80401 USA;

Tennessee Technol Univ Dept Phys Cookeville TN 38505 USA;

Oak Ridge Natl Lab Div Phys Oak Ridge TN 37831 USA;

Oak Ridge Natl Lab Div Phys Oak Ridge TN 37831 USA;

Rutgers State Univ Dept Phys &

Astron Piscataway NJ 08854 USA;

Univ N Carolina Dept Phys &

Astron Chapel Hill NC 27599 USA;

Yale Univ Wright Nucl Struct Lab New Haven CT 06520 USA;

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中图分类原子核物理学、高能物理学;
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1. s-wave scattering lengths for the Be-7 + p system from an R-matrix analysis [J] . Paneru S. N., Brune C. R., Giri R., Physical review, C . 2019,第4期

机译：来自R-Matrix分析的BE-7 + P系统的S波散射长度
2. R-matrix analysis of the He-3(n, p)H-3 and Be-7(n, p)Li-7 reactions [J] . Adahchour A., Descouvemont P. Journal of Physics, G. Nuclear and Particle Physics: An Institute of Physics Journal . 2003,第2期

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3. Verification of R-matrix calculations for charged-particle reactions in the resolved resonance region for the Be-7 system [J] . Thompson Ian J., deBoer R. J., Dimitriou P., The European Physical Journal, A. Hadrons and Nuclei . 2019,第6期

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s-wave scattering lengths for the Be-7 + p system from an R-matrix analysis

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