Nonresonant p-wave direct capture and interference effect observed in the O16(n,γ)O17 reaction

Y. Nagai, M. Kinoshita, M. Igashira, Y. Nobuhara, H. Makii, K. Mishima, T. Shima, and A. Mengoni
Phys. Rev. C 102, 044616 – Published 27 October 2020

Abstract

We measured the total capture cross section of the O16(n,γ)O17 reaction, as well as partial cross sections leading to the ground (Jπ=5/2+) and first-excited (Jπ=1/2+) states in O17. The measurement was carried out at average neutron energies of 157, 349, 398, 427, 468, 498, and 556 keV by using pulsed neutrons produced via the Li7(p,n)Be7 reaction and a γ-ray detection system based on an anti-Compton NaI(Tl) spectrometer. We observed the interference effect between the 3/2 resonance state at 4554 keV of O17, corresponding to a neutron energy of 411 keV in the center-of-mass system, and a nonresonant contribution in the capture process. The measured partial cross sections are in good agreement with theoretical calculations obtained taking into account the interference between the 3/2 resonance and a nonresonant p-wave direct radiative capture contribution. Using the present results, together with our previous measurement, we derived the Maxwellian-averaged capture cross sections (MACS) for thermal energies between kT=5 and 100 keV, key quantities for s process nucleosynthesis studies in massive stars.

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  • Received 28 July 2020
  • Accepted 9 October 2020

DOI:https://doi.org/10.1103/PhysRevC.102.044616

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Y. Nagai1,2, M. Kinoshita1, M. Igashira3, Y. Nobuhara1, H. Makii1,4, K. Mishima1,5, T. Shima1,2, and A. Mengoni6,7

  • 1Department of Applied Physics, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan
  • 2Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
  • 3Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan
  • 4Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 5High Energy Accelerator Research Organization, Tokai, Ibaraki, 319-1106, Japan
  • 6Agenzia per la Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile - ENEA, Bologna, Italy
  • 7Istituto Nazionale di Fisica Nucleare - INFN, Sezione di Bologna, Italy

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Issue

Vol. 102, Iss. 4 — October 2020

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