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通过~(20)Ne(p,n)~(20)Na反应,对核天体物理反应中引人注意的~(20)Na衰变作了较深入的研究。发现了~(20)Na的1个新的β~+延迟a衰变道,其a能量和相对强度分别为(5896±6)keV和(0.0024±0.0003)kev(以2150 kev a峰强度为100)。同时在实验上观察到了~(20)Na β~+延迟~(16)O反冲,并由此推断出了β~+延迟低能a衰变,a平均能量约为780kev,相对强度约为1.4。另外,还就此~(16)O反冲和低能a衰变,讨论了低能带电粒子在物质中的能量损失规律。最后还对如何进一步甄别~(20)Na β~+延迟低能a衰变提出了新的探测方法。
The attentive ~ (20) Na decay in the nuclear astrophysical reaction has been studied in detail by the ~ (20) Ne (p, n) ~ (20) Na reaction. A new β ~ + delayed a-decay channel of ~ (20) Na was found, whose energy and relative intensities were (5896 ± 6) keV and (0.0024 ± 0.0003) kev, respectively ). At the same time, the ~ (20) Naβ ~ + delay ~ (16) O backscattering experimentally was observed, and the β ~ + delayed low energy a decay was deduced. The average energy of a is about 780kev and the relative intensity is about 1.4. In addition, the energy loss law of low-energy charged particles in materials is also discussed in this paper. Finally, a new detection method is proposed for how to further identify ~ (20) Naβ ~ + delayed low energy a decay.