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Study on low-energy resonances of $$^{22}$$Ne ($$alpha$$,$$gamma$$) $$^{26}$$Mg using $$^{22}$$Ne + $$^6$$Li reaction

Ota, Shuya; Makii, Hiroyuki   ; Ishii, Tetsuro  ; Nishio, Katsuhisa   ; Mitsuoka, Shinichi; Nishinaka, Ichiro; Chiba, Satoshi

While the reaction $$^{22}$$Ne ($$alpha$$,n) $$^{25}$$Mg in stellar helium burning is considered to be the dominant neutron source for s-process in massive stars with M $$>$$ 8 solar mass, the competing $$^{22}$$Ne ($$alpha$$,$$gamma$$) $$^{26}$$Mg reaction may be considerable strength and significantly reduce the neutron production. A branching ratio of the two reactions and resonance parameters such as levels and strengths in $$^{26}$$Mg produced by $$alpha$$ + $$^{22}$$Ne should be experimentally determined with good accuracy. Presently, uncertainty in the observed resonance levels at E$$_{alpha}$$ (830 keV) have not been cleared up despite their important roles in the neutron production. In this work, we set our goal to investigate this low energy resonance. Experiments were performed using $$^{22}$$Ne beam at Tokai Tandem accelerator in Japan Atomic Energy Agency. In this symposium, we will present our experimental scheme and future prospective.



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