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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >STRUCTURE OF AL-24 FOR THE STELLAR REACTION RATE OF MG-23 (P,GAMMA) AL-24
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STRUCTURE OF AL-24 FOR THE STELLAR REACTION RATE OF MG-23 (P,GAMMA) AL-24

机译：AL-24的结构对MG-23（P，GAMMA）AL-24的恒星反应速率

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The nuclear levels of Al-24 were studied by the Mg-24(He-3,t) Al-24 reaction at 60 MeV. Several new states were identified including a level at 2.787 MeV just above the proton threshold in Al-24, and considerable level shifts were observed for most levels around the threshold. The spin-parity assignments were also made for many states including the threshold states by the angular distribution measurement. This clarifies the spin-parity and the excitation energy of the critical levels assumed before for the stellar reaction rate calculation of Mg-23 (p, gamma) Al-24. A large increase of the reaction rate is predicted, based on the present experimental result, at the temperature region of T9 = 0.2-0.8 which would be crucial for the break-out process of the NeNa cycle to the MgAl cycle. This result suggests that the onset temperature of Mg-23(p, gamma) Al-24 should be lowered roughly by 10%. Application of the (He-3, t) reaction at 60 MeV for spin assignment is also discussed. [References: 20]
机译：通过在60 MeV下的Mg-24（He-3，t）Al-24反应研究了Al-24的核能水平。确定了几个新的状态，包括一个高于Al-24质子阈值的2.787 MeV的水平，并且在阈值附近的大多数水平都观察到了相当大的水平变化。还通过角度分布测量对包括阈值状态在内的许多状态进行了自旋奇偶校验分配。这澄清了以前为计算Mg-23（p，γ）Al-24的恒星反应速率而假定的临界水平的自旋奇偶性和激发能。根据目前的实验结果，预计在T9 = 0.2-0.8的温度范围内反应速率将大大提高，这对于将NeNa循环分解为MgAl循环至关重要。该结果表明，Mg-23（p，γ）Al-24的起始温度应大约降低10％。还讨论了在60 MeV下（He-3，t）反应用于自旋分配的应用。 [参考：20]

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