Study of the E_α=470 keV Resonance in ²²Ne via ¹⁸O(⁶Li, d)²²Ne Reaction

About a half of the abundances of elements heavier than iron comes from the so-called slowneutron capture process (s-process) in Asymptotic Giant Branch (AGB) stars, with the ²²Ne(α, n)²⁵Mg reaction as one of the main neutron sources. In the beginning phase of AGB thermal pulse, ²²Ne is produced by the ¹⁴N(α, γ)¹⁸F(β⁺)¹⁸O(α, γ)²²Ne reaction sequence, in which the ¹⁸O(α, γ)²²Ne reaction plays a key role. While the reaction rate of the ¹⁸O(α, γ)²²Ne is mainly affected by several resonant states lying closely to the α threshold in ²²Ne, up to now, the relevant ²²Ne parameters are fragmentary in the energy region corresponding to the typical temperatures of s-process. The direct measurement of the ¹⁸O(α, γ)²²Ne reaction rate is extremely difficult due to the very low cross section. In this work, we investigated the ²²Ne resonant states via the ¹⁸O(⁶Li, d)²²Ne reaction at the Beijing HI-13 tandem accelerator of China Institute of Atomic Energy. Based on the DWBA analysis, preliminary results showed that the spin-parity of ²²Ne E_α=470 keV resonant states was assigned as 0⁺, which would make contributions to subsequent calculation for the reaction rate of the ¹⁸O(α, γ)²²Ne.