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

M. Munch; C. Matei; S. D. Pain; M. T. Febbraro; K. A. Chipps; H. J. Karwowski; C. Aa Diget; A. Pappalardo; S. Chesnevskaya; G. L. Guardo; D. Walter; D. L. Balabanski; F. D. Becchetti; C. R. Brune; K. Y. Chae; J. Frost-Schenk; M. J. Kim; M. S. Kwag; M. La Cognata; D. Lattuada; R. G. Pizzone; G. G. Rapisarda; G. V. Turturica; C. A. Ur; Y. Xu

doi:10.1103/PhysRevC.101.055801

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

M. Munch, C. Matei, S. D. Pain, M. T. Febbraro, K. A. Chipps, H. J. Karwowski, C. Aa Diget, A. Pappalardo, S. Chesnevskaya, G. L. Guardo, D. Walter, D. L. Balabanski, F. D. Becchetti, C. R. Brune, K. Y. Chae, J. Frost-Schenk, M. J. Kim, M. S. Kwag, M. La Cognata, D. LattuadaR. G. Pizzone, G. G. Rapisarda, G. V. Turturica, C. A. Ur, Y. Xu

Nuclear Structure and Nuclear Astrophysi

Research output: Contribution to journal › Article › peer-review

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Abstract

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.

Original language	English
Article number	055503
Journal	Physical Review C
Volume	101
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.101.055801
State	Published - May 2020

Funding

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 HIγS 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. 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 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.

Funders	Funder number
ELI-NP
European Regional Development Fund-the Competitiveness
NRF-2016R1A5A1013277	NRF-2018M7A1A1072274
United Kingdom Research and Innovation
National Science Foundation	PHY-1404218
U.S. Department of Energy
Office of Science
National Nuclear Security Administration	DE-NA0002132
Nuclear Physics	DE-AC05-00OR22725
Oak Ridge National Laboratory	DE-FG02-88ER40387, DE-NA0003883, DE-FG02-97ER41033, DE-FG02-97ER41041
University of North Carolina
Aarhus Universitet
James Madison University
College of Pharmacy	1334
Seventh Framework Programme	307447
Science and Technology Facilities Council	ST/L005727/1, ST/P003885/1
European Research Council
National Research Foundation of Korea
Ministry of Education, Science and Technology
European Regional Development Fund	1/07.07.2016

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Munch, M., Matei, C., Pain, S. D., Febbraro, M. T., Chipps, K. A., Karwowski, H. J., Diget, C. A., 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., ... Xu, Y. (2020). Measurement of the 7Li(γ,t)4He ground-state cross section between Eγ=4.4 and 10 MeV. Physical Review C, 101(5), Article 055503. https://doi.org/10.1103/PhysRevC.101.055801

@article{68a9d4ce48eb40269820fa8b14101e36,

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

abstract = "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.",

author = "M. Munch and C. Matei and Pain, {S. D.} and Febbraro, {M. T.} and Chipps, {K. A.} and Karwowski, {H. J.} and Diget, {C. Aa} and A. Pappalardo and S. Chesnevskaya and Guardo, {G. L.} and D. Walter and Balabanski, {D. L.} and Becchetti, {F. D.} and Brune, {C. R.} and Chae, {K. Y.} and J. Frost-Schenk and Kim, {M. J.} and Kwag, {M. S.} and {La Cognata}, M. and D. Lattuada and Pizzone, {R. G.} and Rapisarda, {G. G.} and Turturica, {G. V.} and Ur, {C. A.} and Y. Xu",

note = "Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

month = may,

doi = "10.1103/PhysRevC.101.055801",

language = "English",

volume = "101",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "5",

}

Munch, M, Matei, C, Pain, SD, Febbraro, MT, Chipps, KA, Karwowski, HJ, Diget, CA, Pappalardo, A, Chesnevskaya, S, Guardo, GL, Walter, D, Balabanski, DL, Becchetti, FD, Brune, CR, Chae, KY, Frost-Schenk, J, Kim, MJ, Kwag, MS, La Cognata, M, Lattuada, D, Pizzone, RG, Rapisarda, GG, Turturica, GV, Ur, CA & Xu, Y 2020, 'Measurement of the 7Li(γ,t)4He ground-state cross section between Eγ=4.4 and 10 MeV', Physical Review C, vol. 101, no. 5, 055503. https://doi.org/10.1103/PhysRevC.101.055801

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.

PY - 2020/5

Y1 - 2020/5

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.

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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 - 055503

ER -

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

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