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Volume 35 Issue 4
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Article Navigation >  Nuclear Physics Review  > 2018  >  35(4): 450-454

SU Yi, ZENG Sheng, LI Yunju, WANG Youbao, LI Zhihong, GUO Bing, SU Jun, YAN Shengquan, FAN Qiwen, GAN Lin, HAN Zhiyu, LI Xinyue, LIAN Gang, LIU Jiancheng, MA Tianli, SHEN Yangping, ZHOU Yong, LIU Weiping. Study of the Eα=470 keV Resonance in 22Ne via 18O(6Li, d)22Ne Reaction[J]. Nuclear Physics Review, 2018, 35(4): 450-454. doi: 10.11804/NuclPhysRev.35.04.450
Citation: SU Yi, ZENG Sheng, LI Yunju, WANG Youbao, LI Zhihong, GUO Bing, SU Jun, YAN Shengquan, FAN Qiwen, GAN Lin, HAN Zhiyu, LI Xinyue, LIAN Gang, LIU Jiancheng, MA Tianli, SHEN Yangping, ZHOU Yong, LIU Weiping. Study of the Eα=470 keV Resonance in 22Ne via 18O(6Li, d)22Ne Reaction[J]. Nuclear Physics Review, 2018, 35(4): 450-454. doi: 10.11804/NuclPhysRev.35.04.450
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Study of the Eα=470 keV Resonance in 22Ne via 18O(6Li, d)22Ne Reaction

doi: 10.11804/NuclPhysRev.35.04.450

  • China Institute of Atomic Energy, Beijing 102413, China

Funds:  National Natural Science Foundation of China (11475265)
  • Received Date: 2018-09-28
  • Rev Recd Date: 2018-12-01
  • Publish Date: 2020-05-03
  • 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 Eα=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.
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Study of the Eα=470 keV Resonance in 22Ne via 18O(6Li, d)22Ne Reaction

doi: 10.11804/NuclPhysRev.35.04.450
  • China Institute of Atomic Energy, Beijing 102413, China
Funds:  National Natural Science Foundation of China (11475265)
  • Received Date: 2018-09-28
  • Rev Recd Date: 2018-12-01
  • Publish Date: 2020-05-03

Abstract: 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 Eα=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.

SU Yi, ZENG Sheng, LI Yunju, WANG Youbao, LI Zhihong, GUO Bing, SU Jun, YAN Shengquan, FAN Qiwen, GAN Lin, HAN Zhiyu, LI Xinyue, LIAN Gang, LIU Jiancheng, MA Tianli, SHEN Yangping, ZHOU Yong, LIU Weiping. Study of the Eα=470 keV Resonance in 22Ne via 18O(6Li, d)22Ne Reaction[J]. Nuclear Physics Review, 2018, 35(4): 450-454. doi: 10.11804/NuclPhysRev.35.04.450
Citation: SU Yi, ZENG Sheng, LI Yunju, WANG Youbao, LI Zhihong, GUO Bing, SU Jun, YAN Shengquan, FAN Qiwen, GAN Lin, HAN Zhiyu, LI Xinyue, LIAN Gang, LIU Jiancheng, MA Tianli, SHEN Yangping, ZHOU Yong, LIU Weiping. Study of the Eα=470 keV Resonance in 22Ne via 18O(6Li, d)22Ne Reaction[J]. Nuclear Physics Review, 2018, 35(4): 450-454. doi: 10.11804/NuclPhysRev.35.04.450
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