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

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

doi:10.1103/PhysRevC.99.045807

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

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

Nuclear Structure and Nuclear Astrophysi

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Abstract

The astrophysical S factor for the radiative proton capture reaction on Be7 (S17) at low energies is affected by the s-wave scattering lengths. We report the measurement of elastic and inelastic scattering cross sections for the Be7+p system in the center-of-mass energy range 0.474-2.740 MeV and center-of-mass angular range 70-150. A radioactive Be7 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 17.34-1.33+1.11 and -3.18-0.50+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 S17 at zero energy. The level structure of B8 is discussed based upon the results from this work. Evidence for the existence of 0+ and 2+ levels in B8 at 1.9 and 2.21 MeV, respectively, is observed.

Original language	English
Article number	045807
Journal	Physical Review C
Volume	99
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.99.045807
State	Published - Apr 30 2019

Funding

We are grateful to R. J. deBoer for his assistance with azure 2. We thank D. R. Phillips for taking part in constructive discussions. This work was supported in part by the U.S. Department of Energy under Grants No. DE-NA0002905, No. DE-NA0003883, No. DE-FG02-88ER40387, and No. DE-FG02-93ER40789 and Contract No. DE-AC05-00OR22725 (ORNL). D.W.B. acknowledges support from the NSF under Grant No. PHY-1713857. B.D. acknowledges support from the NSERC, Canada. The work of K.Y.C. was supported in part by National Research Foundation of Korea (NRF) Grants No. NRF-2016R1A5A1013277 and No. NRF-2013M7A1A1075764 funded by the Korean government (MEST). This research used resources of the Holifield Radioactive Ion Beam Facility, which was a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The authors are grateful to the staff of the HRIBF whose hard work made the experiment possible.

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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, K. L., Johnson, M. S., Kozub, R. L., Ma, Z., Nesaraja, C. D., Pain, S. D., ... Wrede, C. (2019). S-wave scattering lengths for the Be 7 +p system from an R-matrix analysis. Physical Review C, 99(4), Article 045807. https://doi.org/10.1103/PhysRevC.99.045807

@article{7b980a7ddd5648dfbb1b9cb4bd336bc8,

title = "S-wave scattering lengths for the Be 7 +p system from an R-matrix analysis",

abstract = "The astrophysical S factor for the radiative proton capture reaction on Be7 (S17) at low energies is affected by the s-wave scattering lengths. We report the measurement of elastic and inelastic scattering cross sections for the Be7+p system in the center-of-mass energy range 0.474-2.740 MeV and center-of-mass angular range 70-150. A radioactive Be7 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 17.34-1.33+1.11 and -3.18-0.50+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 S17 at zero energy. The level structure of B8 is discussed based upon the results from this work. Evidence for the existence of 0+ and 2+ levels in B8 at 1.9 and 2.21 MeV, respectively, is observed.",

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

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

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doi = "10.1103/PhysRevC.99.045807",

language = "English",

volume = "99",

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Paneru, SN, Brune, CR, Giri, R, Livesay, RJ, Greife, U, Blackmon, JC, Bardayan, DW, Chipps, KA, Davids, B, Connolly, DS, Chae, KY, Champagne, AE, Deibel, C, Jones, KL, Johnson, MS, Kozub, RL, Ma, Z, Nesaraja, CD , Pain, SD, Sarazin, F, Shriner, JF, Stracener, DW, Smith, MS, Thomas, JS, Visser, DW & Wrede, C 2019, 'S-wave scattering lengths for the Be 7 +p system from an R-matrix analysis', Physical Review C, vol. 99, no. 4, 045807. https://doi.org/10.1103/PhysRevC.99.045807

TY - JOUR

T1 - S-wave scattering lengths for the Be 7 +p system from an R-matrix analysis

AU - Paneru, S. N.

AU - Brune, C. R.

AU - Giri, R.

AU - Livesay, R. J.

AU - Greife, U.

AU - Blackmon, J. C.

AU - Bardayan, D. W.

AU - Chipps, K. A.

AU - Davids, B.

AU - Connolly, D. S.

AU - Chae, K. Y.

AU - Champagne, A. E.

AU - Deibel, C.

AU - Jones, K. L.

AU - Johnson, M. S.

AU - Kozub, R. L.

AU - Ma, Z.

AU - Nesaraja, C. D.

AU - Pain, S. D.

AU - Sarazin, F.

AU - Shriner, J. F.

AU - Stracener, D. W.

AU - Smith, M. S.

AU - Thomas, J. S.

AU - Visser, D. W.

AU - Wrede, C.

PY - 2019/4/30

Y1 - 2019/4/30

N2 - The astrophysical S factor for the radiative proton capture reaction on Be7 (S17) at low energies is affected by the s-wave scattering lengths. We report the measurement of elastic and inelastic scattering cross sections for the Be7+p system in the center-of-mass energy range 0.474-2.740 MeV and center-of-mass angular range 70-150. A radioactive Be7 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 17.34-1.33+1.11 and -3.18-0.50+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 S17 at zero energy. The level structure of B8 is discussed based upon the results from this work. Evidence for the existence of 0+ and 2+ levels in B8 at 1.9 and 2.21 MeV, respectively, is observed.

AB - The astrophysical S factor for the radiative proton capture reaction on Be7 (S17) at low energies is affected by the s-wave scattering lengths. We report the measurement of elastic and inelastic scattering cross sections for the Be7+p system in the center-of-mass energy range 0.474-2.740 MeV and center-of-mass angular range 70-150. A radioactive Be7 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 17.34-1.33+1.11 and -3.18-0.50+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 S17 at zero energy. The level structure of B8 is discussed based upon the results from this work. Evidence for the existence of 0+ and 2+ levels in B8 at 1.9 and 2.21 MeV, respectively, is observed.

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U2 - 10.1103/PhysRevC.99.045807

DO - 10.1103/PhysRevC.99.045807

M3 - Article

AN - SCOPUS:85065415312

SN - 2469-9985

VL - 99

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 045807

ER -

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

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