Neutron Yield from p¹¹B Fusion Plasma

Abstract

It is presented to estimate yields of neutron and radioactive nucleus (⁷Be, ¹²B, ¹⁰C, ¹¹C, ¹⁴C, ¹³N) per one p¹¹B fusion reaction by the following 15 reactions : ¹¹B (p, n) ¹¹C, ¹¹B (α, n) ¹⁴N, ¹¹B (α, p) ¹⁴C, (α, n) of the structure material (SUS316) bombarded by α-particles, (γ, n) of the same and ¹¹B (γ, n) ¹⁰B by 16MeV γ -ray of ¹¹B (p, γ) ¹²C, ¹⁰B (p, n) ¹⁰C, ¹⁰B (α, n) ¹³N, ¹⁰B (p, γ) nc, ¹⁰B (p, α) ⁷Be, ¹¹B (d, n) ¹²C, ¹¹B (d, 2n) ¹¹C, ¹¹B (d, p) ¹²B, ¹⁰B (d, n) ¹¹ 10B (d, n) C and D (d, n) ³He, in the p¹¹B fusion plasma with impurities of ¹⁰B and D. Result shows that the neutron yields by the other 7 reactions than¹¹B (p, n) ¹¹C, ¹¹B (α, n) ¹⁴N, SUS316 (γ, n) and ¹¹B (d, n) ¹²C can be neglected (< 10^-7). Neutron yield and averaged energy by the above 4 main reactions are 2.27×10^-3 and 2.49 MeV, and, 9.62×10^-5 and 3.93 MeV from the plasma of T_i=300keV and T_i/T_e=1, and T_i/T_e=200, respectively.