Resonant scattering of Na-22 + p studied by the thick-target inverse-kinematic method
- Authors
- Jin, S. J.; Wang, Y. B.; Su, J.; Yan, S. Q.; Li, Y. J.; Guo, B.; Li, Z. H.; Zeng, S.; Lian, G.; Bai, X. X.; Liu, W. P.; Yamaguchi, H.; Kubono, S.; Hu, J.; Kahl, D.; Jung, H. S.; Moon, J. Y.; Lee, C. S.; Teranishi, T.; Wang, H. W.; Ishiyama, H.; Iwasa, N.; Komatsubara, T.; Brown, B. A.
- Issue Date
- Sep-2013
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW C, v.88, no.3
- Journal Title
- PHYSICAL REVIEW C
- Volume
- 88
- Number
- 3
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/14307
- DOI
- 10.1103/PhysRevC.88.035801
- ISSN
- 0556-2813
1089-490X
- Abstract
- Background: In presolar low-density graphite grains, an extraordinarily large Ne-22/Ne-20 ratio or even nearly pure Ne-22 is found, pointing to the condensation of radioactive Na-22 in grains. Supernovae and neon-rich novae are the main events that produce Na-22 via the explosive hydrogen burning process. The Na-22(p,gamma)Mg-23 reaction is one of the key reactions that influences the Na-22 abundance in ejecta. Purpose: The present work aims to explore the proton resonant states in Mg-23 relevant to the astrophysical Na-22(p,gamma)Mg-23 reaction. The determined Mg-23 resonant parameters can be used to evaluate the Na-22(p,gamma)Mg-23 reaction rate. Method: A low-energy Na-22 radioactive ion beam is produced via the H-1(Ne-22, Na-22)n reaction, and used to measure the experimental excitation function of the Na-22 + p resonant scattering with a conventional thick-target inverse kinematic method. R-matrix analysis is applied to deduce the Mg-23 resonance parameters from the experimental excitation function. Results: Three proton resonance states in Mg-23 are observed. Spins/parities and the proton partial widths are determined. The deduced excitation energies agree with the compiled values. Conclusions: The new spin and parity assignments allow us to perform a shell-model calculation of the. widths of the Mg-23 resonant states for the evaluation of the Na-22(p,gamma) Mg-23 astrophysical reaction rate. The two s-wave resonant states established in this work at 8.793 and 8.916 MeV in Mg-23, respectively, increase the total reaction rate by about 5% at a temperature greater than 2 GK.
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