~(179)Hf(n,2n)~(178)Hf~(m2)和~(209)Bi(n,2n)~(208)Bi反应截面的测量

THE CROSS SECTION MEASUREMENTS FOR THE ~(179)Hf(n, 2n) ~(178)Hfm~2 and ~(209)Bi (n, 2n) ~(208)Bi REACTIONS

摘要: 用活化法测量相对于~(93)Nb(n,2n)~(92)Nb~m反应的~(179)Hf(n,2n)~(178)Hf~(m2)的反应截面和相对于~(27)Al(n,2n)~(24)Na反应的~(209)Bi(n,2n)~(208)Bi的反应截面。在中子能量为14.4 MeV处~(179)Hf(n,2n)~(178)Hf~(m2)反应的测量截面为(6.04±0.32)×10~(-31)m~2。在中子能量为14.6 MeV处~(209)Bi(n,2n)~(208)Bi反应的测量截面为(2279±173)×10~(31)m~2。在这些测量中,中子能量是用~(90)Zr(n,2n)~(89)Zr~(m+8)反应和~(93)Nb(n,2n)~(92)Nb~m反应的截面比法测定的。

Abstract: The Cross section measurements for the ~(179)Hf (n, 2n) ~(178)Hf~(m2) and ~(209)Bi (n, 2n ) ~(208)Bi reactions usingactivation method are described. The ~(93)Nb (n, 2n) ~(92)Nb~m and ~(27)Al (n, α) ~(24)Na reactions are selected asmonitors respectively. Cross section values of (6.04±0.32)×10~(-31)m~2 at 14. 4 MeV for the ~(179)Hf(n,2n) ~(178)Hf~(m2) and of (2279±173)×10~(-31)m~2 at 14. 6 MeV for the ~(209)Bi (n, 2n ) ~(208)Bi are obtained. Theneutron energies in these measurements are determined by cross-section ratios of ~(90)Zr (n, 2n) ~(89)Zr~(m+8) and~(93)Nb (n, 2n) ~(92)Nb~m reactions.