New measurement of the 74Ge(p, γ)75As reaction cross sections in the p-process nucleosynthesis

D. Wu; N.Y. Wang; B. Guo; C.Y. He; Y. Tian; X. Tao; T.L. Ma; F.L. Liu; W.S. Yang; J.H. Wei; Y.P. Shen; S.L. Guo; Q.W. Fan; X.G. Wu; Y. Zheng; T.X. Li; Z.Q. Wang; H.L. Luo; Y.N. Liu; M.L. Qiu

Physics Letters B (Jun 2020)

New measurement of the 74Ge(p, γ)75As reaction cross sections in the p-process nucleosynthesis

D. Wu,
N.Y. Wang,
B. Guo,
C.Y. He,
Y. Tian,
X. Tao,
T.L. Ma,
F.L. Liu,
W.S. Yang,
J.H. Wei,
Y.P. Shen,
S.L. Guo,
Q.W. Fan,
X.G. Wu,
Y. Zheng,
T.X. Li,
Z.Q. Wang,
H.L. Luo,
Y.N. Liu,
M.L. Qiu

Affiliations

D. Wu: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
N.Y. Wang: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China; College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China; Corresponding author at: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China.
B. Guo: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China; Corresponding author.
C.Y. He: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
Y. Tian: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China; China Nuclear Data Center, China Institute of Atomic Energy, P. O. Box 275(41), Beijing 102413, China
X. Tao: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China; China Nuclear Data Center, China Institute of Atomic Energy, P. O. Box 275(41), Beijing 102413, China
T.L. Ma: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
F.L. Liu: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China; College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
W.S. Yang: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China; College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
J.H. Wei: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China; College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
Y.P. Shen: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
S.L. Guo: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
Q.W. Fan: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
X.G. Wu: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
Y. Zheng: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
T.X. Li: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
Z.Q. Wang: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
H.L. Luo: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
Y.N. Liu: Department of Nuclear Physics, China Institute of Atomic Energy, P. O. Box 275(7), Beijing 102413, China
M.L. Qiu: College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China

Journal volume & issue: Vol. 805

Abstract

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The 74Ge(p,γ)75As reaction plays a crucial role in producing the lightest p-nucleus 74Se. In this work, we present the measurement of the 74Ge(p,γ)75As cross sections in the range of Ep = 1.4-2.8 MeV with an in-beam method at the tandem accelerator of China Institute of Atomic Energy. The present result is in good agreement with the previous experiments at higher energies, and extends the measurement down to lower energies of astrophysical interest. Theoretical calculations are also performed using the EMPIRE nuclear reaction code and well reproduce all experimental cross sections, which shed some light on the existing discrepancy in the previously reported experimental and theoretical values at the lowest energies. The resulting reaction rates exhibit a considerable increase of up to 47% within the p-process relevant temperatures when comparing with the REACLIB compilation.

Published in Physics Letters B

ISSN: 0370-2693 (Print); 1873-2445 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/physics-letters-b/

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