摘要:
95Zr(n,γ)
96Zr是稳定燃烧的恒星中合成
96Zr的唯一途径,对研究恒星演化和重元素合成具有重要的意义。由于
95Zr半衰期为64 d,直接测量
95Zr(n,γ)
96Zr截面极为困难,因此,本工作采用替代比率法间接测量
95Zr(n,γ)
96Zr截面。本工作测量了94Zr(
18O,
16Oγ)
96Zr和
90Zr(
18O,
16Oγ)
92Zr反应,得到了复合核
96Zr
*和
90Zr
*衰变到γ道的几率比,并利用截面已知的
91Zr(n,γ)
92Zr截面乘以实验所测比率,得到了
En=0~8 MeV能区的
95Zr(n,γ)
96Zr中子俘获截面。
95Zr(n, γ)
96Zr cross section is important for the study of stellar evolution and heavy elements nucleosynthesis because the reaction is the only way to produce the
96Zr in Asymptotic giant branch stars. The direct measurement of
95Zr(n, γ)
96Zr is very difficult due to the short half-life of
95Zr, 64 days. The surrogate ratio method was carried out to measure
95Zr(n, γ)
96Zr cross sections. We measured the
94Zr(
18O,
16Oγ)
96Zr and
90Zr(
18O,
16Oγ)
92Zr reactions and obtained the γ-decay probability ratio of compound nuclei
96Zr
* and
92Zr
*. The
95Zr(n, γ)
96Zr cross section is determined by the obtained ratio multiplying the known
91Zr(n, γ)
92Zr cross section at
En=0~8 MeV.