Low-energy cross-section measurement of the  B10(α,n)N13 reaction and its impact on neutron production in first-generation stars

Liu, Q.; Febbraro, M.; deBoer, R. J.; Aguilar, S.; Boeltzig, A.; Chen, Y.; Couder, M.; Görres, J.; Lamere, E.; Lyons, S.; Macon, K. T.; Manukyan, K.; Morales, L.; Pain, S.; Peters, W. A.; Seymour, C.; Seymour, G.; Toomey, R.; Kolk, B. Vande; Weaver, J.; Wiescher, M.

doi:10.1103/PhysRevC.101.025808

Title: Low-energy cross-section measurement of the ${}^{10}B (α, n) {}^{13}N$ reaction and its impact on neutron production in first-generation stars

Journal Article · Wed Feb 26 00:00:00 EST 2020 · Physical Review. C

DOI:https://doi.org/10.1103/PhysRevC.101.025808· OSTI ID:1619007

Liu, Q. ^[1];

^[2]; deBoer, R. J. ^[1]; Aguilar, S. ^[1];

^[3];

^[1];

^[1]; Görres, J. ^[1]; Lamere, E. ^[4]; Lyons, S. ^[5]; Macon, K. T. ^[6];

^[1];

^[2]; Peters, W. A. ^[2]; Seymour, C. ^[1];

^[7]; Toomey, R. ^[8]; Kolk, B. Vande ^[1]; Weaver, J. ^[9] more »

Joint Inst. for Nuclear Astrophysics (JINA), Notre Dame, IN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Joint Inst. for Nuclear Astrophysics (JINA), Notre Dame, IN (United States); Gran Sasso National Lab. (LNGS), Assergi (Italy)
Joint Inst. for Nuclear Astrophysics (JINA), Notre Dame, IN (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Joint Inst. for Nuclear Astrophysics (JINA), Notre Dame, IN (United States); Michigan State Univ., East Lansing, MI (United States)
Joint Inst. for Nuclear Astrophysics (JINA), Notre Dame, IN (United States); Louisiana State Univ., Baton Rouge, LA (United States)
Joint Inst. for Nuclear Astrophysics (JINA), Notre Dame, IN (United States); Rutgers Univ., Piscataway, NJ (United States)
Rutgers Univ., Piscataway, NJ (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)

Nucleosynthesis in the first generation of massive stars offers a unique setting to explore the creation of the first heavier nuclei in an environment free of impurities from earlier stellar generations. In later generations of massive stars, hydrogen burning occurs predominantly through the CNO cycles, but without the carbon, nitrogen, and oxygen to catalyze the reaction sequence, first stars would have to rely on the inefficient pp chains for their energy production. Observations of second and third generation stars show pronounced abundances of carbon and oxygen isotopes, which suggests a rapid conversion of the primordial abundances to heavier elements. While the triple-alpha-process primarily facilitates this conversion, there are alternative reaction sequences, such as ²H(α,γ)⁶Li(α,γ)¹⁰B(α,n)¹³N, that may play a significant role. To study such alternate reaction pathways for production of carbon and heavier nuclei, a number of new measurements are needed. In this work, new measurements are reported for the ¹⁰B(α,n)¹³N reaction, extending the cross section down to 575 keV incident α-particle energy. The measurements were made using a state-of-the-art deuterated liquid scintillator and a spectrum unfolding technique. An R-matrix analysis was performed in order to facilitate a comparison of the underlying nuclear structure with the reaction measurements. An unexpected upturn is observed in the low-energy S factor that indicates the presence of a new low-energy resonance. Finally, a revised reaction rate is determined that takes into account the present data as well as other previous measurements from the literature that were previously neglected.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Rutgers Univ., Piscataway, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

Grant/Contract Number:: AC05-00OR22725; Phys-1713857; Phys-0822648; PHY-1430152; NA0003897

OSTI ID:: 1619007

Alternate ID(s):: OSTI ID: 1601730; OSTI ID: 1755873

Journal Information:: Physical Review. C, Vol. 101, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Title: Low-energy cross-section measurement of the B 10 ( α , n ) N 13 reaction and its impact on neutron production in first-generation stars

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Title: Low-energy cross-section measurement of the ${}^{10}B (α, n) {}^{13}N$ reaction and its impact on neutron production in first-generation stars