Reanalysis of the N13(p,γ)O14 reaction and its role in the stellar CNO cycle

S. B. Dubovichenko, R. Ya. Kezerashvili, N. A. Burkova, A. V. Dzhazairov-Kakhramanov, and B. Beisenov
Phys. Rev. C 102, 045805 – Published 9 October 2020

Abstract

Within the framework of the modified potential cluster model with forbidden states, the N13(p,γ)O14 reaction rate and the astrophysical S factor are considered. It is shown that the first p13 N resonance determines the S factor and contributions of the M1 and E2 transitions are negligible at energies E<1MeV, but are significant at high energies. The S factor strongly depends on the S13 resonance parameters. The influence of the width of the S13 resonance on the S factor is demonstrated. The reaction rate is calculated and an analytical approximation for the reaction rate is proposed. A comparison of our calculation with existing data is addressed. Results of our calculations for the N13(p,γ)O14 reaction rate provide the contribution to the steadily improving reaction-rate database libraries. Our calculations of the N13(p,γ)O14 reaction rate along with results for the rates of the N14(p,γ)O15 and C12(p,γ)N13 processes provide the temperature range 0.13<T9<0.97 for the conversion of the carbon-nitrogen-oxygen (CNO) cycle to the hot CNO cycle. Our results demonstrate that, at the early stages of a nova explosion at temperatures of about 0.1T9 and at late stages of evolution of supermassive stars at temperatures of about 1.0T9, the ignition of the hot CNO cycle could occur at much lower densities of a stellar medium.

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  • Received 24 February 2020
  • Revised 23 August 2020
  • Accepted 21 September 2020

DOI:https://doi.org/10.1103/PhysRevC.102.045805

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

S. B. Dubovichenko1,2, R. Ya. Kezerashvili3,4, N. A. Burkova2, A. V. Dzhazairov-Kakhramanov1, and B. Beisenov1,2

  • 1Fesenkov Astrophysical Institute “NCSRT” ASA MDASI RK, 050020, Almaty, Kazakhstan
  • 2al-Farabi Kazakh National University, 050040, Almaty, Kazakhstan
  • 3New York City College of Technology, City University of New York, Brooklyn, New York 11201, USA
  • 4Graduate School and University Center, City University of New York, New York 10016, USA

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Issue

Vol. 102, Iss. 4 — October 2020

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