Multichannel R -matrix analysis of C-12 compound nucleus reactions


Alaçayır O., Kam E., Yetkin T., Bıyık R., Yalçın T.

PHYSICAL REVIEW C - NUCLEAR PHYSICS, vol.109, no.1, pp.11-19, 2024 (SCI-Expanded)

  • Publication Type: Article / Article
  • Volume: 109 Issue: 1
  • Publication Date: 2024
  • Doi Number: 10.1103/physrevc.109.014619
  • Journal Name: PHYSICAL REVIEW C - NUCLEAR PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, INSPEC
  • Page Numbers: pp.11-19
  • Istanbul Technical University Affiliated: Yes

Abstract

We have calculated the cross sections (CS), differential cross sections (DCS), and astrophysical S factors for the reactions 11B(p,α1)8Be11B(p,α0)8Be11B(p,p0)11B11B(p,p1)11B11B(p,γ0)12C11B(p,γ1)12C, and 11B(p,n0)11C through a multichannel-multilevel R-matrix analysis. We have performed calculations for the energy range 100 keV–3.5 MeV and compared the calculated values with the experimental values. As a result, we have obtained the energy value, spin, and parity of some 12C excited levels within this energy interval. Additionally, we have determined the channel spins and angular momentum of the α18Beα08Bep011Bp111B, and n011C pairs, as well as the electric and magnetic multipoles of the 11B(p,γ0)12C and 11B(p,γ1)12C channels. Although the analysis results and experimental data mostly agree, we have found some inconsistencies in the S-factor values for the 11B(p,p1)11B channel at the 19.2–19.5 MeV energy interval. For the 11B(p,α1)8Be decay channel of the 16.57 MeV (2) resonance, the literature discusses which orbital angular momentum quantum value (l=1 or l=3) is true. We used both values in our analysis, and although no significant difference in the results were observed in the region of the 16.57 MeV (2) resonance, we obtained a better fit with l=3 values in the high energy region affected by the tail of this resonance.