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Title: Measurement of the Li 7 ( γ , t ) He 4 ground-state cross section between E γ = 4.4 and 10 MeV

Abstract

Here, the Li 7 ( γ , t ) He 4 ground state cross section was measured for the first time using monoenergetic γ rays with energies between 4.4 and 10 MeV at the High Intensity Gamma-ray Source. The reaction is important for the primordial Li problem and for testing our understanding of the mirror α -capture reactions H 3 ( α , γ ) Li 7 and He 3 ( α , γ ) Be 7 . Although over the last 30 years most measurements of the H 3 ( α , γ ) Li 7 reaction have concentrated in an energy range below E γ = 3.65 MeV, measurements at higher energies could potentially restrict the extrapolation to astrophysically important energies. The experimental arrangement for measuring the Li 7 ( γ , t ) He 4 reaction included a large-area silicon detector array and several beam characterization instruments. The experimental astrophysical S factor of H 3 ( α , γ ) calculated from the present data was fitted using the R -matrix formalism. The results are in disagreement with previous experimental measurements in the same energy range but the extrapolated S factor agrees with the potential model calculation and lower energy experimental data.

Authors:
 [1]; ORCiD logo [2];  [3];  [3];  [3];  [4];  [5];  [2];  [2];  [6];  [7];  [2];  [8];  [9];  [10];  [5];  [10];  [10];  [11];  [2] more »;  [11];  [11];  [2];  [2];  [2] « less
  1. Aarhus Univ. (Denmark). Dept. of Physics and Astronomy; Univ. of York (United Kingdom). Dept. of Physics
  2. Horia Hulubei National Inst. for R&D in Physics and Nuclear Engineering, Bucharest-Magurele (Romania). Extreme Light Infrastructure - Nuclear Physics
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Physics; Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory
  5. Univ. of York (United Kingdom). Dept. of Physics
  6. Horia Hulubei National Inst. for R&D in Physics and Nuclear Engineering, Bucharest-Magurele (Romania). Extreme Light Infrastructure - Nuclear Physics; Istituto Nazionale di Fisica Nucleare (INFN), Catania (Italy). Lab. Nazionali del Sud (INFN-LNS)
  7. Rutgers Univ., New Brunswick, NJ (United States). Dept. of Physics and Astronomy
  8. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
  9. Ohio Univ., Athens, OH (United States)
  10. Sungkyunkwan Univ., Suwon (Republic of Korea). Dept. of Physics
  11. Istituto Nazionale di Fisica Nucleare (INFN), Catania (Italy). Lab. Nazionali del Sud (INFN-LNS)
Publication Date:
Research Org.:
Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA); European Research Council (ERC); National Science Foundation (NSF); Science and Technology Facilities Council (STFC) (United Kingdom); National Research Foundation of Korea (NRF)
OSTI Identifier:
1658871
Grant/Contract Number:  
FG02-97ER41033; FG02-97ER41041; AC05-00OR22725; FG02-88ER40387; NA0003883; NA0002132; LOEBNA-307447; PHY-1404218; ST/P003885/1; ST/L005727/1; NRF-2016R1A5A1013277; NRF-2018M7A1A1072274
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 101; Journal Issue: 5; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; big bang nucleosynthesis; photonuclear reactions; nuclear data analysis & compilation; radiation detectors

Citation Formats

Munch, M., Matei, C., Pain, S. D., Febbraro, M. T., Chipps, K. A., Karwowski, H. J., Diget, C. Aa., Pappalardo, A., Chesnevskaya, S., Guardo, G. L., Walter, D., Balabanski, D. L., Becchetti, F. D., Brune, C. R., Chae, K. Y., Frost-Schenk, J., Kim, M. J., Kwag, M. S., La Cognata, M., Lattuada, D., Pizzone, R. G., Rapisarda, G. G., Turturica, G. V., Ur, C. A., and Xu, Y.. Measurement of the Li7(γ,t)He4 ground-state cross section between Eγ=4.4 and 10 MeV. United States: N. p., 2020. Web. https://doi.org/10.1103/physrevc.101.055801.
Munch, M., Matei, C., Pain, S. D., Febbraro, M. T., Chipps, K. A., Karwowski, H. J., Diget, C. Aa., Pappalardo, A., Chesnevskaya, S., Guardo, G. L., Walter, D., Balabanski, D. L., Becchetti, F. D., Brune, C. R., Chae, K. Y., Frost-Schenk, J., Kim, M. J., Kwag, M. S., La Cognata, M., Lattuada, D., Pizzone, R. G., Rapisarda, G. G., Turturica, G. V., Ur, C. A., & Xu, Y.. Measurement of the Li7(γ,t)He4 ground-state cross section between Eγ=4.4 and 10 MeV. United States. https://doi.org/10.1103/physrevc.101.055801
Munch, M., Matei, C., Pain, S. D., Febbraro, M. T., Chipps, K. A., Karwowski, H. J., Diget, C. Aa., Pappalardo, A., Chesnevskaya, S., Guardo, G. L., Walter, D., Balabanski, D. L., Becchetti, F. D., Brune, C. R., Chae, K. Y., Frost-Schenk, J., Kim, M. J., Kwag, M. S., La Cognata, M., Lattuada, D., Pizzone, R. G., Rapisarda, G. G., Turturica, G. V., Ur, C. A., and Xu, Y.. Thu . "Measurement of the Li7(γ,t)He4 ground-state cross section between Eγ=4.4 and 10 MeV". United States. https://doi.org/10.1103/physrevc.101.055801. https://www.osti.gov/servlets/purl/1658871.
@article{osti_1658871,
title = {Measurement of the Li7(γ,t)He4 ground-state cross section between Eγ=4.4 and 10 MeV},
author = {Munch, M. and Matei, C. and Pain, S. D. and Febbraro, M. T. and Chipps, K. A. and Karwowski, H. J. and Diget, C. Aa. and Pappalardo, A. and Chesnevskaya, S. and Guardo, G. L. and Walter, D. and Balabanski, D. L. and Becchetti, F. D. and Brune, C. R. and Chae, K. Y. and Frost-Schenk, J. and Kim, M. J. and Kwag, M. S. and La Cognata, M. and Lattuada, D. and Pizzone, R. G. and Rapisarda, G. G. and Turturica, G. V. and Ur, C. A. and Xu, Y.},
abstractNote = {Here, the Li7(γ,t)He4 ground state cross section was measured for the first time using monoenergetic γ rays with energies between 4.4 and 10 MeV at the High Intensity Gamma-ray Source. The reaction is important for the primordial Li problem and for testing our understanding of the mirror α-capture reactions H3(α,γ)Li7 and He3(α,γ)Be7. Although over the last 30 years most measurements of the H3(α,γ)Li7 reaction have concentrated in an energy range below Eγ=3.65 MeV, measurements at higher energies could potentially restrict the extrapolation to astrophysically important energies. The experimental arrangement for measuring the Li7(γ,t)He4 reaction included a large-area silicon detector array and several beam characterization instruments. The experimental astrophysical S factor of H3(α,γ) calculated from the present data was fitted using the R-matrix formalism. The results are in disagreement with previous experimental measurements in the same energy range but the extrapolated S factor agrees with the potential model calculation and lower energy experimental data.},
doi = {10.1103/physrevc.101.055801},
journal = {Physical Review C},
number = 5,
volume = 101,
place = {United States},
year = {2020},
month = {5}
}

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