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

TY - JOUR

T1 - Measurement of the 7Li(γ,t)4He ground-state cross section between Eγ=4.4 and 10 MeV

AU - Munch, M.

AU - Matei, C.

AU - Pain, S. D.

AU - Febbraro, M. T.

AU - Chipps, K. A.

AU - Karwowski, H. J.

AU - Diget, C. Aa

AU - Pappalardo, A.

AU - Chesnevskaya, S.

AU - Guardo, G. L.

AU - Walter, D.

AU - Balabanski, D. L.

AU - Becchetti, F. D.

AU - Brune, C. R.

AU - Chae, K. Y.

AU - Frost-Schenk, J.

AU - Kim, M. J.

AU - Kwag, M. S.

AU - La Cognata, M.

AU - Lattuada, D.

AU - Pizzone, R. G.

AU - Rapisarda, G. G.

AU - Turturica, G. V.

AU - Ur, C. A.

AU - Xu, Y.

N1 - Funding Information: The authors wish to thank A. Banu from James Madison University for lending the two gold foils used in the activation measurement, F. Lyckegaard from Aarhus University for preparation of the LiF targets, and HI?S personnel for the technical support during this experiment. This work was supported in part by Extreme Light Infrastructure Nuclear Physics (ELI-NP) Phase II, a project co-financed by the Romanian Government and by the European Regional Development Fund-the Competitiveness Operational Programme (1/07.07.2016, COP, ID 1334), the European Research Council under ERC starting Grant LOBENA, No. 307447 (Aarhus), the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contracts No. DE-AC05-00OR22725 (ORNL), No. DE-FG02-88ER40387 and No. DE-NA0003883 (Ohio), No. DE-FG02-97ER41033 and No. DE-FG02-97ER41041 (UNC), and the National Nuclear Security Administration DE-NA0002132 (Rutgers), the National Science Foundation PHY-1404218 (Rutgers), the United Kingdom Research and Innovation and the Science and Technology Facilities Council through Grants No. ST/P003885/1 and No. ST/L005727/1, and the National Research Foundation of Korea grant funded by the Korea government (MEST) No. NRF-2016R1A5A1013277 and No. NRF-2018M7A1A1072274. Funding Information: The authors wish to thank A. Banu from James Madison University for lending the two gold foils used in the activation measurement, F. Lyckegaard from Aarhus University for preparation of the LiF targets, and HI γ S personnel for the technical support during this experiment. This work was supported in part by Extreme Light Infrastructure Nuclear Physics (ELI-NP) Phase II, a project co-financed by the Romanian Government and by the European Regional Development Fund–the Competitiveness Operational Programme (1/07.07.2016, COP, ID 1334), the European Research Council under ERC starting Grant LOBENA, No. 307447 (Aarhus), the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contracts No. DE-AC05-00OR22725 (ORNL), No. DE-FG02-88ER40387 and No. DE-NA0003883 (Ohio), No. DE-FG02-97ER41033 and No. DE-FG02-97ER41041 (UNC), and the National Nuclear Security Administration DE-NA0002132 (Rutgers), the National Science Foundation PHY-1404218 (Rutgers), the United Kingdom Research and Innovation and the Science and Technology Facilities Council through Grants No. ST/P003885/1 and No. ST/L005727/1, and the National Research Foundation of Korea grant funded by the Korea government (MEST) No. NRF-2016R1A5A1013277 and No. NRF-2018M7A1A1072274. Publisher Copyright: © 2020 American Physical Society. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/5/14

Y1 - 2020/5/14

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85085974645&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.101.055801

DO - 10.1103/PhysRevC.101.055801

M3 - Article

AN - SCOPUS:85085974645

SN - 2469-9985

VL - 101

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 055801

ER -