Study of the Proton Resonant States in ²³Mg via ²²Na+p Thick-target Elastic Scattering

²²Na(p, γ)²³Mg and ¹⁹Ne(α, p)²²Na are two crucial reactions in the so-called NeNa-MgAl cycle and the rapid-proton process, their astrophysical reaction rates are indispensable inputs in understanding the outburst mechanism and element synthesis of novae. Since many proton resonance levels in odd-A compound nucleus ²³Mg may be involved at nova temperature, existing measurements can only provide partial effective information on the ²²Na(p, γ)²³Mg reaction, large discrepancies still exist in the astrophysical reaction rates of the two reactions. In the present work, ²²Na+p resonance scattering via thick target inverse kinematics was studied at RIBLL1 radioactive beam line in the HIRFL national laboratory at Lanzhou. Excitation functions of ²²Na(p, p) are obtained in the energy range of E_c.m. = 1.5 to 4 MeV. Obvious resonance structure is observed in the ²³Mg compound nucleus, resonance parameters are deduced for 22 proton resonance states in ²³Mg via R-matrix analysis, which will be used for the evaluation of the astrophysical reaction rates of ²²Na(p, γ)²³Mg and ¹⁹Ne(α, p)²²Na.