氘-氘聚变反应高能γ射线产额的实验研究

Experimental Study on Yield of High Energy γ-ray in d-d Fusion Reaction

本文对低能D(d,γ)~4 He聚变反应进行了实验研究。由于D(d,γ)~4 He聚变反应γ射线的产额低、能量高、本底大,实验采用大NaI-塑料闪烁体反康谱仪,以提高探测效率并降低宇宙线的影响;采用脉冲束飞行时间方法区分中子和γ射线,以减小中子和宇宙线本底的影响。实验测量了300keV d束轰击厚D靶和薄D靶两种情况下的γ数据。在计算反应产生23.8 MeV的高能γ峰面积时,采用了拟合法扣除本底。实验测得,对厚靶,D(d,γ)4 He反应截面为2.47×10^(-37) m^2;对薄靶,D(d,γ)4 He反应截面为4.36×10^(-37) m^2。

The D（d,γ）4 He fusion reaction at low energy was studied in this paper.Due to the small yields,the high energy and the strong background ofγ-ray,a big NaIplastic scintillator anti-Compton spectrometer was employed to increase the detect efficiency and reduce the impact of the cosmic rays,and the method of the time-of-flight（TOF）was used to discriminate neutron and gamma to reduce the background of neutron and cosmic rays.The thick and thin deuterium-loaded titanium target experiments were performed at Ed=300keV.The background was subtracted by our fitting method.The cross section is 2.47×10-37 m2 for the thick target and 4.36×10-37 m2 for the thin target.